UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

Matterport, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT

Dear Fellow Stockholders of Matterport, Inc.:

On April 21, 2024, CoStar Group, Inc. (“CoStar Group”), Matrix Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of CoStar Group (“Merger Sub I”), Matrix Merger Sub II LLC, a Delaware limited liability company and wholly owned subsidiary of CoStar Group (“Merger Sub II”), and Matterport, Inc. (“Matterport”) entered into a merger agreement (the “Merger Agreement”) under which, upon the terms and subject to the conditions set forth therein, Merger Sub I will merge with and into Matterport, with Matterport surviving as a direct, wholly owned subsidiary of CoStar Group (the “First Merger”). Immediately thereafter, subject to the terms of the Merger Agreement and, in certain circumstances, at the discretion of CoStar Group, in a single integrated transaction with the First Merger, Matterport will merge with and into Merger Sub II, with Merger Sub II surviving as a direct, wholly owned subsidiary of CoStar Group (the “Second Merger” and together with the First Merger, the “Mergers”). In connection with the Second Merger, Merger Sub II’s name will be changed to “Matterport, LLC”. A copy of the Merger Agreement is included as Annex A to the accompanying proxy statement/prospectus.

If the First Merger is completed, you will be entitled to receive for each share of Matterport Class A common stock (“Matterport Common Stock”) you own an amount equal to $2.75 in cash plus a number of shares of CoStar Group common stock (“CoStar Group Common Stock”) equal to the exchange ratio set forth in the Merger Agreement. The exchange ratio depends on the average of the daily volume weighted averages of the trading prices of CoStar Group Common Stock on the Nasdaq Global Select Market on each of the 20 consecutive trading days ending on and including the trading day that is three trading days prior to the effective time of the First Merger (the “Average Share Price”). If the Average Share Price is greater than or equal to $94.62, then the exchange ratio shall be set at 0.02906. If the Average Share Price is less than or equal to $77.42, then the exchange ratio shall be set at 0.03552. If the Average Share Price is greater than $77.42 and less than $94.62, then the exchange ratio shall be equal to the quotient of $2.75 divided by the Average Share Price.

The transaction price represents a premium of approximately 216.1% over the Matterport Common Stock closing price on April 19, 2024, the last trading day before the public announcement of the execution of the Merger Agreement with CoStar Group, and a premium of 181.4% over the 20-day volume weighted average on the same date. The value of the merger consideration to be received in exchange for each share of Matterport Common Stock will fluctuate with the market value of CoStar Group Common Stock until the transaction is complete. Matterport Common Stock is listed on the Nasdaq Global Market under the symbol “MTTR”. CoStar Group Common Stock is listed on the Nasdaq Global Select Market under the symbol “CSGP”. Upon completion of the Mergers, former Matterport stockholders are expected to own approximately 2.8% - 3.4% of the then outstanding CoStar Group Common Stock, based on CoStar Group’s outstanding equity as of April 19, 2024.

Matterport will hold a special meeting of its stockholders on July 26, 2024, at 10:00 a.m. Pacific Time (the “Special Meeting”). In the interest of providing our stockholders with a more convenient, cost-effective method of attending, the Special Meeting will be conducted virtually via live webcast. You will be able to attend the Special Meeting online by visiting https://web.lumiconnect.com/216187135 (password: matterport2024).

Information about the Special Meeting, the Mergers, the Merger Agreement, and the other business to be considered by stockholders at the Special Meeting is contained in the accompanying proxy statement/prospectus. The Matterport board of directors has fixed the close of business on June 6, 2024 as the record date for the determination of Matterport stockholders entitled to notice of, and to vote at, the Special Meeting. For further information on how to participate in the meeting, please see “The Special Meeting” in the accompanying proxy statement/prospectus.

At the Special Meeting, the Matterport stockholders will be asked to (i) consider and vote on a proposal to adopt the Merger Agreement (the “Merger Proposal”), (ii) consider and vote on a non-binding advisory proposal to approve the compensation that may be paid or become payable to the named executive officers of Matterport that is based on or otherwise relates to the Mergers and (iii) consider and vote on a proposal to approve the adjournment of the Special Meeting, if necessary or appropriate, including adjournment to permit further solicitation of proxies in favor of the Merger Proposal.

The Matterport board of directors has unanimously (i) determined and declared that the Merger Agreement and the transactions contemplated thereby, including the Mergers, are fair to and in the best interests of Matterport and its stockholders, (ii) declared that the Merger Agreement, the Mergers and the other transactions contemplated thereby are advisable and (iii) approved the execution, delivery and performance by Matterport of the Merger Agreement and the transactions contemplated thereby, including the Mergers.

The Matterport board of directors accordingly recommends that the Matterport stockholders vote “FOR” the proposal to approve and adopt the Merger Agreement and the transactions contemplated thereby, including the Mergers, “FOR” the non-binding, advisory proposal to approve the compensation that may be paid or become payable to Matterport’s named executive officers in connection with the Mergers and “FOR” the proposal to adjourn the Special Meeting, if necessary or appropriate, including to solicit additional votes for approval of the Merger Proposal.

In considering the recommendation of the Matterport board of directors, you should be aware that the directors and executive officers of Matterport have certain interests in the transaction that may be different from, or in addition to, the interests of Matterport stockholders generally. See the section titled “The Mergers—Interests of Matterport Directors and Executive Officers in the Mergers” beginning on page 62 of the accompanying proxy statement/prospectus for a more detailed description of these interests.

In particular, we urge you to read carefully the section titled “Risk Factors” beginning on page 26 of the accompanying proxy statement/prospectus. If you have any questions regarding the accompanying proxy statement/prospectus, you may contact D.F. King & Co., Inc., Matterport’s proxy solicitor, by calling 866-356-7813.

Your vote is very important. Matterport and CoStar Group cannot complete the Mergers unless the Matterport stockholders adopt the Merger Proposal. Whether or not you plan to attend the Special Meeting, please submit a proxy to vote your shares as promptly as possible to ensure that your shares of Matterport Common Stock are represented at the Special Meeting. The attached proxy statement/prospectus describes the Special Meeting, the Mergers, the documents related to the Mergers, and other related matters. Please review the entire proxy statement/prospectus. You can also obtain information about Matterport and CoStar Group from documents that each has filed with the Securities and Exchange Commission.

On behalf of the Matterport board of directors, we would like to express our appreciation for your continued support of, and interest in, Matterport.

Sincerely,

R.J. Pittman

Chairman of the Board and Chief Executive Officer

Sunnyvale, California

June 10, 2024

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the Mergers or the securities to be issued pursuant to the Mergers under this proxy statement/prospectus or has passed upon the adequacy or accuracy of the disclosure in this proxy statement/prospectus. Any representation to the contrary is a criminal offense.

This proxy statement/prospectus is dated June 10, 2024, and is first being mailed to or otherwise Matterport stockholders on or about June 10, 2024.

Matterport, Inc.

352 East Java Drive

Sunnyvale, California 94089

NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

Dear Fellow Stockholders of Matterport, Inc.:

NOTICE IS HEREBY GIVEN that Matterport, Inc. (“Matterport”) will hold a special meeting of stockholders of Matterport (the “Special Meeting”), which will be held virtually on July 26, 2024, at 10:00 a.m. Pacific Time. You will be able to attend the Special Meeting online by visiting https://web.lumiconnect.com/216187135 (password: matterport2024) and entering your virtual control number included on your proxy card, or on the instructions that accompanied your proxy materials provided by your bank or broker. You will be able to listen to the Special Meeting live, submit questions and vote online during the Special Meeting. You will not be able to attend in person. At the Special Meeting, stockholders will consider and vote on the following matters:

MATTERS

Each of the proposals is more fully described in the accompanying proxy statement/prospectus of Matterport and CoStar Group, which provides you with information about Matterport, CoStar Group, the Special Meeting, the Mergers, the Merger Agreement and other related matters. Matterport encourages you to carefully read the accompanying proxy statement/prospectus in its entirety, including the annexes and the documents incorporated by reference.

Matterport will transact no other business at the Special Meeting except such business as may properly be brought before the Special Meeting or any adjournment or postponement thereof. The accompanying proxy statement/prospectus, including the Merger Agreement attached thereto as Annex A contains further information with respect to these matters.

The Matterport board of directors has approved and declared advisable the Merger Agreement and the transactions contemplated by the Merger Agreement, on the terms and subject to the conditions set forth in the

Merger Agreement. The Matterport board of directors accordingly recommends that Matterport stockholders vote “FOR” the Merger Proposal, “FOR” for the Transaction Related Compensation Proposal and “FOR” for the Adjournment Proposal.

Approval of the Merger Proposal requires the affirmative vote of a majority of the issued and outstanding shares of Matterport Class A common stock entitled to vote at the Special Meeting on the Merger Proposal. Approval of each of the Transaction Related Compensation Proposal and the Adjournment Proposal requires the affirmative vote of a majority of the votes cast at the Special Meeting on each proposal.

The record date for determining stockholders entitled to receive notice of and to vote at the Special Meeting or adjournment or postponement thereof is the close of business on June 6, 2024. Only stockholders of record at the close of business on the record date are entitled to receive notice of, participate in, and vote at the Special Meeting and any postponements or adjournments thereof. A complete list of such stockholders will be open to the examination of any stockholder for a period of 10 calendar days prior to and through the date of the Matterport special meeting for a purpose germane to the meeting by sending an email to Matthew Zinn, Chief Legal Officer, at legal@matterport.com, stating the purpose of the request and providing proof of ownership of Matterport stock.

Your vote is very important regardless of the number of Matterport shares you own. Matterport and CoStar Group cannot complete the Mergers unless the Matterport stockholders adopt the Merger Proposal. Regardless of whether you plan to attend the Special Meeting, please vote as soon as possible by following the voting procedures described on the proxy card. If you do not vote on the Merger Proposal, it will have the same effect as a vote by you against the Merger Proposal. Submitting a proxy will not prevent you from voting virtually at the Special Meeting, but it will help to secure a quorum and avoid added solicitation costs if you decide not to or become unable to attend the Special Meeting. Any eligible holder of Matterport shares may vote virtually at the Special Meeting, thereby revoking any previous proxy. In addition, a proxy may also be revoked in writing before the Special Meeting in the manner described in the proxy statement/prospectus of which this notice is a part.

To ensure that a quorum is present at the Special Meeting, please vote your shares over the Internet or by telephone, or you may sign, date and mail the proxy card in the enclosed envelope, whether or not you expect to attend the Special Meeting. Note that, in light of possible disruptions in mail service, we encourage stockholders to submit their proxy via the Internet or telephone.

If you hold your shares in a brokerage account, you should be aware that, if you do not instruct your broker how to vote, your broker will not be permitted to vote your shares for the Merger Proposal, the Transaction Related Compensation Proposal or the Adjournment Proposal. Therefore, you must affirmatively take action to vote your shares at the Special Meeting. If you do not, your shares will not be voted on these items.

By Order of the Board of Directors of Matterport, Inc.,

R.J. Pittman

Chairman of the Board and Chief Executive Officer

Sunnyvale, California

June 10, 2024

ADDITIONAL INFORMATION

This proxy statement/prospectus incorporates by reference important business and financial information about CoStar Group and Matterport from other documents that are not included in or delivered with this proxy statement/prospectus. This information is available to you without charge upon your written or oral request. You can obtain the documents incorporated by reference into this proxy statement/prospectus by requesting them in writing or by telephone from the appropriate company at the following addresses and telephone numbers:

Investors may also consult the websites of CoStar Group or Matterport for more information concerning the Mergers and the other transactions described in this proxy statement/prospectus. The website of CoStar Group is www.costargroup.com and the website of Matterport is www.matterport.com. Information included on these websites is not incorporated by reference into this proxy statement/prospectus.

If you would like to request any documents, please do so by July 18, 2024, in order to receive them before the Special Meeting.

For more information, see “Where You Can Find More Information.”

ABOUT THIS DOCUMENT

This proxy statement/prospectus, which forms part of a registration statement on Form S-4 filed with the U.S. Securities and Exchange Commission by CoStar Group, Inc. (File No. 333-279571), constitutes a prospectus of CoStar Group under Section 5 of the Securities Act with respect to the CoStar Group Common Stock to be issued in connection with the Mergers. This document also constitutes a proxy statement of Matterport under Section 14(a) of the Exchange Act. It also constitutes a notice of meeting with respect to the Special Meeting of stockholders, at which holders of Matterport Common Stock will be asked to vote upon certain proposals to approve the Mergers and/or other related matters.

You should rely only on the information contained or incorporated by reference into this proxy statement/prospectus. No one has been authorized to provide you with information that is different from that contained in, or incorporated by reference into, this proxy statement/prospectus. This proxy statement/prospectus is dated June 10, 2024. You should not assume that the information contained in, or incorporated by reference into, this proxy statement/prospectus is accurate as of any date other than the date on the front cover of those documents. Neither the mailing of this proxy statement/prospectus to Matterport stockholders nor the issuance of CoStar Group Common Stock in connection with the Mergers will create any implication to the contrary.

This proxy statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, or the solicitation of a proxy, in any jurisdiction in which or from any person to whom it is unlawful to make any such offer or solicitation in such jurisdiction. Information contained in this proxy statement/prospectus regarding CoStar Group has been provided by CoStar Group and information contained in this proxy statement/prospectus regarding Matterport has been provided by Matterport.

CERTAIN DEFINED TERMS

The following terms are used throughout this proxy statement/prospectus. Unless stated otherwise, the terms set forth below, whenever used in this proxy statement/prospectus, have the following meanings:

TABLE OF CONTENTS

QUESTIONS AND ANSWERS

The following are answers to some questions that you, as a stockholder of Matterport, may have regarding the proposed transactions between CoStar Group, Merger Sub I, Merger Sub II and Matterport, and the other matters being considered at the Special Meeting. You are encouraged to carefully read this proxy statement/prospectus because the information in this section does not provide all the information that might be important to you with respect to the Mergers and the other matters being considered at the Special Meeting. Additional important information is also contained in the annexes to and the documents incorporated by reference into this proxy statement/prospectus.

The Merger Agreement must be adopted by the Matterport stockholders in accordance with DGCL in order for the Mergers to be consummated. Matterport is holding the Special Meeting of its stockholders to obtain that approval, and your vote is required. Matterport stockholders will also be asked to vote on a non-binding, advisory proposal to approve certain compensation that may be paid or become payable to Matterport’s named executive officers that is based on or otherwise relates to the Mergers and to approve the adjournment of the Special Meeting, from time to time, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes at the time of the Special Meeting to approve the Merger Proposal.

This proxy statement/prospectus contains important information about the Mergers and the other proposals being considered and voted on at the Special Meeting, and you should read it carefully. It is a proxy statement because the Matterport Board is soliciting proxies from its stockholders. It is a prospectus because CoStar Group will issue shares of CoStar Group Common Stock. The enclosed voting materials allow Matterport stockholders to vote their shares without attending the Special Meeting.

CoStar Group is not required to obtain stockholder approval in connection with the issuance of CoStar Group Common Stock pursuant to the terms of the Merger Agreement and applicable law.

Your vote is very important. Matterport encourages you to submit a proxy to have your shares of Matterport Common Stock voted as soon as possible.

1

If Matterport experiences technical difficulties during the Special Meeting (e.g., a temporary or prolonged power outage), it will determine whether the Special Meeting can be promptly reconvened (if the technical difficulty is temporary) or whether the Special Meeting will need to be reconvened on a later day (if the technical difficulty is more prolonged). In any such situation, Matterport will promptly notify stockholders of the decision via the virtual meeting website.

2

A list of registered stockholders entitled to vote at the Special Meeting will be made available for examination by any stockholder for any purpose germane to the meeting for a period of at least 10 days prior to the Special Meeting between the hours of 9:00 a.m. and 5:00 p.m., Pacific Time, at our principal executive offices by contacting our Chief Legal Officer, Matthew Zinn by telephone at (408) 805-3347 or by email at legal@matterport.com.

Your shares will be counted towards the quorum if you submit a valid proxy or attend the Special Meeting. Abstentions will count as votes present and entitled to vote for the purposes of determining the presence of a quorum for the transaction of business at the Special Meeting. Brokers, banks or other nominees that hold shares for beneficial owners do not have discretionary authority to vote the shares as to any matter at the meeting without receiving voting instructions from the beneficial owners. Such shares will be considered to be broker-non votes and will not be counted as present at the Special Meeting for the purpose of determining the presence of a quorum.

YOUR VOTE AS A MATTERPORT STOCKHOLDER IS VERY IMPORTANT EVEN IF YOU OWN ONLY A SMALL NUMBER OF SHARES OF MATTERPORT COMMON STOCK. Your immediate response will help avoid potential delays and may save Matterport significant additional expense associated with soliciting stockholder votes.

The Transaction Related Compensation Proposal. Assuming a quorum is present at the Special Meeting, approval, on a non-binding advisory basis, of the Transaction Related Compensation Proposal requires the affirmative vote of a majority of the votes cast at the Special Meeting on the Transaction Related Compensation Proposal. Accordingly, a Matterport stockholder’s abstention from voting, a broker non-vote or the failure of a Matterport stockholder not present at the meeting to vote (including the failure of a Matterport stockholder who holds shares in “street name” through a bank, broker or other nominee to give voting instructions to that bank, broker or other nominee) will have no effect on the Transaction Related Compensation Proposal.

The Adjournment Proposal. The Special Meeting may be adjourned to solicit additional proxies if there are not sufficient votes at the time of the Special Meeting to approve the Merger Proposal or to ensure that any supplement or amendment to this proxy statement/prospectus is timely provided to Matterport stockholders. Whether or not a quorum is present, approval of the Adjournment Proposal requires the affirmative vote of a

3

majority of the votes cast at the Special Meeting on the Adjournment Proposal, and the chairman of the Special Meeting also has the power to adjourn such Special Meeting from time to time. Accordingly, a Matterport stockholder’s abstention from voting, a broker non-vote or the failure of a Matterport stockholder not present at the meeting to vote (including the failure of a Matterport stockholder who holds shares in “street name” through a bank, broker or other nominee to give voting instructions to that bank, broker or other nominee) will have no effect on the Adjournment Proposal.

For more details on the merger consideration, see “The Merger Agreement—Merger Consideration” beginning on page 72.

4

Former Employee Options. At the First Effective Time, Former Employee Options that are outstanding, whether vested or unvested will be cancelled. Holders of Former Employee Options will receive the merger consideration applicable to the shares of Matterport Common Stock covered by such options after deducting the exercise price (as determined in accordance with the formula in the Merger Agreement), less applicable withholdings.

Matterport RSUs. At the First Effective Time, each Matterport RSU that is outstanding (other than each Matterport RSU that becomes fully vested automatically as a result of Closing (the “Accelerated Matterport RSUs”)) will be converted into a corresponding award in respect of CoStar Group Common Stock based on the Equity Award Conversion Factor (as determined in accordance with the formula in the Merger Agreement). The adjusted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the corresponding Matterport RSUs prior to the First Effective Time.

Accelerated Matterport RSUs. At the First Effective Time, all Accelerated Matterport RSUs will be cancelled and converted into the right to receive the merger consideration applicable to the shares of Matterport Common Stock covered by such Accelerated Matterport RSUs (including any Matterport Common Stock in respect of dividend equivalent units credited thereon).

For more information, see the section titled “The Merger Agreement—Treatment of Outstanding Matterport Equity Awards in the Mergers” beginning on page 72 of this proxy statement/prospectus.

For more information, see the section titled “The Merger Agreement—Treatment of Outstanding Matterport Equity Awards in the Mergers” beginning on page 72 of this proxy statement/prospectus.

After the First Merger is completed, if you hold Matterport Certificates immediately prior to the First Effective Time, the exchange agent will send you a letter of transmittal and instructions for exchanging your Matterport Certificates for the merger consideration. Upon surrender of the Matterport Certificates, the executed letter of transmittal and other required documents, you will receive the merger consideration to which you are entitled.

5

If you hold shares of Matterport Common Stock in book entry form immediately prior to the First Effective Time, you will not need to take any action to receive the merger consideration.

For more information, see the section titled “The Mergers—Exchange of Shares in the Mergers” beginning on page 69 of this proxy statement/prospectus.

If the Second Merger is completed, Matterport will be merged with and into Merger Sub II, with Matterport continuing as the final surviving entity and a wholly owned subsidiary of CoStar Group.

6

The completion of the Mergers is not conditioned on the Mergers qualifying for the Intended Tax Treatment or upon the receipt of an opinion from counsel to that effect. Whether or not the Mergers will qualify for the Intended Tax Treatment depends on facts that will not be known until the Mergers are completed. In particular, the Intended Tax Treatment requires that the value of the shares of CoStar Group Common Stock issued to holders of Matterport Common Stock in the Mergers, determined as of completion of the Mergers, represents at least a minimum percentage of the total consideration paid to holders of Matterport Common Stock in the Mergers. While there is no specific guidance as to precisely what minimum percentage is necessary to satisfy this requirement, it would be satisfied if the value of the CoStar Group Common Stock (valued as of completion of the Mergers) represents at least 40% of the total consideration paid by CoStar Group. Because this test is based on the value of CoStar Group Common Stock as of completion of the Mergers, a substantial decline in the value of the CoStar Group Common Stock could cause this requirement to not be met. Accordingly, no assurance can be given that the Mergers will qualify for the Intended Tax Treatment.

Moreover, neither Matterport nor CoStar Group intends to request a ruling from the Internal Revenue Service regarding the U.S. federal income tax consequences of the Mergers. Accordingly, even if Matterport and CoStar Group conclude that the Mergers qualify for the Intended Tax Treatment, no assurance can be given that the Internal Revenue Service will not challenge that conclusion or that a court would not sustain such a challenge.

Assuming the Mergers qualify for the Intended Tax Treatment, subject to the limitations and qualifications described in the section entitled “Material U.S. Federal Income Tax Consequences” of this proxy statement/prospectus, a holder of Matterport Common Stock whose shares of Matterport Common Stock are exchanged in the Mergers for shares of CoStar Group Common Stock and cash will generally only recognize a capital gain (but not loss) in connection with the exchange in an amount not exceeding the amount of cash received by the holder (except with respect to any cash received in lieu of a fractional share of CoStar Group Common Stock, as discussed below under the section entitled “Material U.S. Federal Income Tax Consequences—Cash Received Instead of a Fractional Share of CoStar Group Common Stock” beginning on page 96 of this proxy statement/prospectus).

In addition, in the event the transaction will be reasonably likely to fail to qualify for the Intended Tax Treatment, CoStar Group may elect not to consummate the Second Merger. The First Merger would still be completed if the Second Merger is not consummated. In that event, holders of Matterport Common Stock would still receive the merger consideration and Matterport would still become a wholly owned subsidiary of CoStar Group.

If the Mergers fail to qualify for the Intended Tax Treatment, a holder of Matterport Common Stock generally would recognize gain or loss in an amount equal to the difference between (i) the fair market value of the shares of CoStar Group Common Stock and the amount of cash received in the Mergers by the holder (including cash received in lieu of a fractional share of CoStar Group Common Stock) and (ii) the holder’s tax basis in the Matterport Common Stock common stock surrendered.

It will not be known at the time of the Special Meeting whether the requirements for the Mergers to qualify for the Intended Tax Treatment will be met. CoStar Group will make a public announcement no later than 45 days after the First Effective Time as to whether or not the Mergers will be reported as a reorganization within the meaning of Section 368(a) of the Code.

For a more detailed discussion of the material U.S. federal income tax consequences of the Mergers, please see the section entitled “Material U.S. Federal Income Tax Consequences” beginning on page 93 of this proxy statement/prospectus.

7

The tax consequences of the Mergers to any particular stockholder will depend on that stockholder’s individual facts and circumstances. Accordingly, you are urged to consult your own tax advisor to determine your tax consequences from the Mergers.

If you hold your shares of Matterport Common Stock in your own name as the stockholder of record, you may submit a proxy to have your shares of Matterport Common Stock voted at the Special Meeting in one of the following ways:

In order to be counted, proxies submitted by telephone or Internet must be received by 11:59 p.m. Pacific Time on July 25, 2024. Proxies submitted by U.S. mail must be received before the start of the Special Meeting.

If you sign and return your proxy card but do not mark your card to instruct the proxies how to vote your shares of Matterport Common Stock on each proposal, your shares of Matterport Common Stock will be voted as recommend by the Matterport Board: “FOR” the approval of the Merger Proposal, “FOR” the approval of the Transaction Related Compensation Proposal and “FOR” the Adjournment Proposal.

If your shares are held in “street name” by a broker, bank or other nominee, you may vote your shares by directing the broker, bank or other similar organization that holds your shares as your nominee on how to vote the shares in your account, or you may vote online at the Special Meeting. Please refer to the voting instructions provided by your broker, bank or other nominee.

8

Under the current rules of the Nasdaq Global Market, brokers, banks or other nominees do not have discretionary authority to vote on any of the proposals at the Special Meeting. Because the only proposals for consideration at the Special Meeting are nondiscretionary proposals, it is not expected that there will be any broker non-votes at the Special Meeting. However, if there are any broker non-votes, they will have (a) the same effect as a vote “AGAINST” the Merger Proposal and (b) no effect on the Transaction Related Compensation Proposal and the Adjournment Proposal.

If your shares of Matterport Common Stock are held in “street name” by your broker, bank or other nominee, you may revoke any prior voting instructions by contacting your broker, bank or other nominee or by attending the Special Meeting and voting by Internet during the meeting.

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

RISK FACTORS

In addition to the other information included and incorporated by reference into this proxy statement/prospectus, including the matters addressed in “Cautionary Statement Regarding Forward-Looking Statements,” you should carefully consider the following risks before deciding how to vote. In addition, you should read and consider the risks associated with each of the businesses of CoStar Group and Matterport because these risks will also affect CoStar Group following completion of the Mergers. For further discussion of factors that could materially affect the outcome of these forward-looking statements, see “Risk Factors” in Item 1A of the respective Annual Reports on Form 10-K for the year ended December 31, 2023, as updated by CoStar Group’s and Matterport’s subsequent filings under the Exchange Act, each of which is filed with the SEC and incorporated by reference into this proxy statement/prospectus. You should also read and consider the other information in this proxy statement/prospectus and the other documents incorporated by reference into this proxy statement/prospectus. For more information, see “Where You Can Find More Information.”

The risks described below are certain material risks, although not the only risks, relating to the transactions contemplated by the Merger Agreement and each of CoStar Group, Matterport, the Surviving Corporation and the Surviving Company in relation to the Mergers. The risks described below are not the only risks that CoStar Group or Matterport currently face or that CoStar Group, the Surviving Corporation or the Surviving Company will face after the completion of the Mergers. Additional risks and uncertainties not currently known or that are currently expected to be immaterial may also adversely affect the business, financial condition and results of operations of CoStar Group, the Surviving Corporation or the Surviving Company, or the market price of CoStar Group Common Stock following the completion of the Mergers.

If any of the following risks and uncertainties develop into actual events, these events could have an adverse effect on the business, financial condition and results of operations of CoStar Group, Matterport, the Surviving Corporation and/or the Surviving Company. In addition, past financial performance may not be a reliable indicator of future performance, and historical trends should not be used to anticipate results or trends in future periods.

Risk Factors Relating to the Mergers

The merger consideration to be paid in exchange for each share of Matterport Common Stock is a combination of cash and shares of CoStar Group Common Stock based on an exchange ratio, subject to adjustment as described herein. Fluctuations in the value of CoStar Group Common Stock can adversely affect the value of the CoStar Group Common Stock portion to be issued in exchange for each share of Matterport Common Stock, and Matterport stockholders may receive merger consideration with a value that, at the time received, is less than anticipated.

Upon completion of the First Merger, each issued and outstanding share of Matterport Common Stock (other than shares of Matterport Common Stock owned or held (x) in treasury or otherwise owned by Matterport, CoStar Group, any subsidiary of Matterport or any wholly owned subsidiary of CoStar Group (including Merger Subs) (each of which such shares will be automatically cancelled and retired immediately prior to the First Effective Time) or (y) by any person who has not voted in favor of, or consented to, the Mergers and properly demands appraisal of such shares under the DGCL) will be converted into the right to receive (i) $2.75 in cash and (ii) a number of shares of CoStar Group Common Stock equal to the Exchange Ratio, subject to further adjustment as described herein. At the time of the initial announcement of the Mergers, the estimated value of the total merger consideration was $5.50 for each share of Matterport Common Stock exchanged in the Mergers, subject to the collar mechanism described herein.

The Exchange Ratio will be calculated based on two factors: the Average Share Price and a 10% symmetrical collar. The Exchange Ratio is subject to a 10% symmetrical collar based on a CoStar Group share price of $86.02 as a midpoint as follows: (a) if the Average Share Price of CoStar Group’s Common Stock is

26

greater than or equal to $94.62, the Exchange Ratio will be 0.02906, (b) if the Average Share Price is less than or equal to $77.42 per share, the Exchange Ratio will be 0.03552 and (c) if the Average Share Price is greater than $77.42 and less than $94.62, then the Exchange Ratio will be equal to the quotient of (x) $2.75 divided by (y) the Average Share Price.

A significant and prolonged decrease in the price of CoStar Group Common Stock on the Nasdaq Global Select Market from the date of the Merger Agreement to the First Effective Time of the Mergers could affect both the number and value of CoStar Group Common Stock that Matterport stockholders receive as part of the merger consideration, as well as the amount of the cash portion of the merger consideration. Matterport stockholders will not know the actual exchange ratio or the final value of the merger consideration when they are asked to vote to approve the proposals at the Special Meeting. Because the Exchange Ratio is based on a 20-day average, the Average Share Price on which the final exchange ratio is based could differ substantially from the price per share of CoStar Group Common Stock on the day on which Matterport stockholders vote on the proposals being considered at the Special Meeting. In addition, the First Effective Time will be three trading days after the Exchange Ratio is fixed and will not take into account any additional fluctuations in the trading price of CoStar Group Common Stock on the Nasdaq Global Select Market during that three day period, even if the changes would result in a more favorable result for Matterport stockholders.

It is impossible to accurately predict the market price of CoStar Group Common Stock at the First Effective Time or during the period over which the Average Share Price is calculated or the effect of the adjustment provisions on the amount of cash to be paid or on the number of shares of CoStar Group Common Stock to be delivered as merger consideration. As a result, Matterport stockholders cannot be certain of the number of shares or value of CoStar Group Common Stock to be delivered upon consummation of the Mergers and Matterport stockholders may receive merger consideration with a value that, at the time received, is less than or more than $5.50 per share for each share of Matterport Common Stock exchanged in the Mergers.

Failure to attract, motivate and retain executives and other key employees could diminish the anticipated benefits of the Mergers.

CoStar Group’s success after the Mergers will depend in part on the ability of CoStar Group to retain Matterport’s key employees. Competition for qualified personnel can be intense. Current and prospective Matterport employees may experience uncertainty about the Mergers’ effects, which may impair CoStar Group’s and Matterport’s ability to attract, retain and motivate key management, sales, marketing, technical and other personnel prior to and following the Mergers. Employee retention may be particularly challenging during the pendency of the Mergers, as employees of Matterport may experience uncertainty about their future roles with the combined company.

If key employees of Matterport depart, the integration of the companies may be more difficult and/or the combined company’s business following the Mergers may be harmed. Furthermore, CoStar Group may have to incur significant costs in identifying, hiring and retaining replacements for departing employees and may lose significant expertise and talent relating to Matterport’s business, and CoStar Group’s ability to realize anticipated benefits of the Mergers may be adversely affected. Accordingly, no assurance can be given that CoStar Group will be able to attract or retain Matterport’s key employees to the same extent that Matterport has been able to attract or retain employees in the past.

Completion of the Mergers is subject to a number of conditions, some of which are outside of the parties’ control. If any of these conditions are not satisfied or waived, the Mergers will not be completed.

The Merger Agreement contains a number of conditions that must be satisfied (or waived) before the parties are required to consummate the Mergers. Those conditions include, among other conditions:

27

The required satisfaction or waiver of the foregoing conditions could delay the completion of the Mergers for a significant period of time or prevent them from occurring at all. Any delay in completing the Mergers could cause the parties not to realize some or all of the benefits that the parties expect to achieve following the completion of the Mergers. There can be no assurance that the conditions to Closing will be satisfied or waived or that the Mergers will be completed. For a more complete summary of the conditions that must be satisfied or waived prior to completion of the Mergers, see “The Merger Agreement—Conditions to Completion of the Mergers.”

In order to complete the Mergers, CoStar Group and Matterport must make certain governmental filings and obtain certain governmental authorizations. If such filings and authorizations are not made or granted or are granted with conditions to the parties, Closing may be jeopardized, or the anticipated benefits of the Mergers may be reduced.

Closing is conditioned upon the expiration or termination of all applicable waiting periods (and any extensions thereof) under the HSR Act and the receipt of other authorizations, consents, clearances or approvals required under certain other laws. The parties’ HSR notifications were filed with the Federal Trade Commission (the “FTC”) and the Department of Justice (the “DOJ”) on May 3, 2024. Following discussions with the FTC, CoStar Group voluntarily withdrew its initial HSR Act notification and refiled a new HSR Act notification. The withdrawal and refiling are standard procedural steps that provide the FTC with additional time to complete its review of the proposed Mergers. The waiting period under the HSR Act is set to expire at 11:59 p.m., Eastern Time, on July 3, 2024. Although CoStar Group and Matterport have agreed in the Merger Agreement to use their reasonable best efforts, subject to certain limitations, to make certain other governmental filings or obtain the required governmental clearances and authorizations, as the case may be, there can be no assurance that the relevant waiting periods will expire or be terminated or that the parties will obtain the relevant clearances and authorizations. In addition, the governmental authorities with or from which these clearances or authorizations are required have broad discretion in administering the governing regulations. Whether and when required governmental clearances or authorizations are granted could be affected by (i) adverse developments in CoStar Group’s or Matterport’s regulatory standing or any other factors regulators consider in granting relevant clearances and authorizations; (ii) governmental, political or community group inquiries, investigations or opposition; or (iii) changes in legislation or the political environment generally. As a condition to clearances or authorization of the Mergers, governmental authorities may seek to impose requirements, limitations or costs or place restrictions on the conduct of CoStar Group’s business after completion of the Mergers. Any such conditions, terms, obligations or restrictions or requested conditions, terms, obligations or restrictions may delay or prevent the Closing or impose additional material costs on or materially limit the revenues of the combined

28

company following the Mergers, or otherwise adversely affecting CoStar Group’s businesses and results of operations after completion of the Mergers. In addition, these terms, obligations or restrictions may result in the delay or abandonment of the Mergers.

CoStar Group’s and Matterport’s business relationships with third parties may be disrupted due to uncertainty associated with the Mergers, which could have an adverse effect on the results of operations, cash flows and financial position.

Parties with which either CoStar Group or Matterport do business may experience uncertainty associated with the Mergers, including relating to current or future business relationships with CoStar Group, Matterport or the combined company. CoStar Group’s and Matterport’s existing business relationships may be disrupted as parties with which CoStar Group or Matterport do business may attempt to negotiate changes in existing business relationships or instead consider entering into business relationships with parties other than CoStar Group, Matterport or the combined company. These disruptions could have an adverse effect on the businesses, financial condition, results of operations or prospects of the combined company, including an adverse effect on CoStar Group’s ability to realize the anticipated benefits of the Mergers. The risk, and any adverse effect, of such disruptions could be exacerbated by a delay in completion of the Mergers or termination of the Merger Agreement.

Certain executive officers and directors of Matterport may have interests in the Mergers that differ from the Matterport stockholders’ interests.

In considering the Matterport Board’s recommendation to vote for the adoption of the Merger Agreement, Matterport stockholders should be aware that non-employee directors and executive officers may have certain interests in the Mergers that are different from or in addition to the interests of Matterport stockholders generally. These interests include, among others, the accelerated vesting of outstanding equity awards, potential severance benefits and other payments and rights to ongoing indemnification and insurance coverage. The Matterport Board was aware of and considered those interests, among other matters, when evaluating and negotiating the Merger Agreement and approving the Merger Agreement, and in making its recommendation that the stockholders approve the adoption of the Merger Agreement.

For more information, see “The Mergers—Interests of Matterport Directors and Executive Officers in the Mergers.”

Failure to complete the Mergers could negatively impact each of CoStar Group and Matterport’s stock price, future business and financial results.

If the Mergers are not completed for any reason, CoStar Group and Matterport’s ongoing businesses may be adversely affected. Without realizing any benefits of having completed the Mergers, CoStar Group and Matterport may be subject to a number of risks, including the following:

29

In addition to the above risks, if the Merger Agreement is terminated and either party’s board of directors instead seeks an alternative transaction, such party’s stockholders cannot be certain that such party will be able to find another party willing to engage in a transaction on more attractive terms than those contemplated by the Merger Agreement.

If the Mergers are not completed, these risks may materialize and may adversely affect CoStar Group’s and/or Matterport’s businesses, financial condition, results of operations and stock prices.

The Merger Agreement subjects CoStar Group and Matterport to restrictions on their respective business activities during the period while the Mergers are pending.

The Merger Agreement contains restrictions, subject to certain exceptions, on CoStar Group’s and Matterport’s ability to take certain actions and generally obligate Matterport to use reasonable best efforts to conduct its business and to cause its subsidiaries to use reasonable best efforts to conduct the businesses of its subsidiaries in all material respects in the ordinary course consistent with past practice during the period of time while the Mergers are pending absent the prior written consent of the other party. These restrictions could prevent CoStar Group and Matterport from pursuing certain business opportunities that arise prior to the consummation of the Mergers or termination of the Merger Agreement and are outside the ordinary course of business. If CoStar Group or Matterport is unable to take actions it believes are beneficial, such restrictions could have an adverse effect on CoStar Group’s or Matterport’s, as applicable, business, financial condition and results of operations. See “The Merger Agreement—Conduct of Business Pending the Mergers.”

The Merger Agreement contains provisions that could discourage a potential competing acquirer of Matterport from making a favorable proposal and, in specified circumstances, could require Matterport to make a termination payment to CoStar Group.

Pursuant to the Merger Agreement, Matterport has agreed, among other things, not to, directly or indirectly, (i) initiate, seek, facilitate, solicit or knowingly encourage (including by way of furnishing information or assistance of any kind) the making of any Competing Proposal or take any other action designed or intended to lead to, or that would reasonably be expected to lead to any inquiry with respect to, or the making, submission or announcement of, any Competing Proposal, (ii) enter into, continue or otherwise participate or engage in negotiations or discussions with or furnish (or cause to be furnished) any material nonpublic information to, any person relating to a Competing Proposal or any inquiry or request that would reasonably be expected to lead to a Competing Proposal, (iii) enter into any letter of intent, agreement in principle, memorandum of understanding, Merger Agreement or other agreement, arrangement or understanding relating to any Competing Proposal (with certain exceptions), (iv) submit to Matterport stockholders for their approval any Competing Proposal, or (v) resolve to do, or agree or announce an intention to do, any of the foregoing. Notwithstanding these “no-shop” restrictions, prior to obtaining the Requisite Stockholder Approval of, under certain specified circumstances the Matterport Board may change its recommendation to stockholders and Matterport may also terminate the Merger Agreement to accept a Superior Proposal upon payment of an $50 million termination fee to CoStar Group. See “The Merger Agreement—Permitted Change in Recommendation” and “The Merger Agreement—Termination of the Merger Agreement.”

These provisions could discourage a potential competing acquirer that might have an interest in acquiring all or a significant part of Matterport from considering or proposing such an acquisition or might result in a potential competing acquirer proposing to pay a lower value than it might otherwise have proposed to pay because of the added expense of the termination fee that may become payable in certain circumstances under the Merger Agreement.

30

The shares of CoStar Group Common Stock Matterport stockholders will receive upon completion of the Mergers will have different rights from shares of Matterport Common Stock.

Matterport stockholders, whose rights are currently governed by Matterport’s Charter, Matterport’s Bylaws and the DGCL, will upon completion of the Mergers become stockholders of CoStar Group and as such, their rights will be governed by the CoStar Group Certificate of Incorporation and the CoStar Group By-laws, although they will continue to be governed by the DGCL. As a result, Matterport stockholders will have different rights than they currently have as Matterport stockholders, which may be less favorable than their current rights. These differences are described in detail in the section titled “Comparison of Rights of CoStar Group Stockholders and Matterport Stockholders.”

After the Mergers, Matterport stockholders will have lower percentage ownership and voting percentage interests in CoStar Group than they currently have in Matterport and will exercise less influence over management.

Currently, Matterport stockholders have the right to vote in the election of the Matterport Board and the power to approve or reject, upon an affirmative vote of at least the majority of voting power of all outstanding shares of Matterport Common Stock, any matters requiring stockholder approval under the DGCL and the Matterport Charter and Bylaws. The actual number of shares of CoStar Group Common Stock to be issued and reserved for issuance in connection with the Mergers will be determined at completion of the Mergers based on the terms of the Merger Agreement and the number of shares of Matterport Common Stock outstanding at that time. Matterport stockholders will hold, in the aggregate, between approximately 2.8% and 3.4% of the issued and outstanding shares of CoStar Group Common Stock immediately following the closing of the First Merger based on the number of issued and outstanding shares of CoStar Group Common Stock and Matterport Common Stock as of April 19, 2024 and April 17, 2024, respectively, and based on the minimum and maximum potential exchange ratios of 0.02906 and 0.03552, respectively. These estimated percentages do not take into account any additional CoStar Group shares to be issued in exchange for vested but unexercised Matterport Options or the Matterport ESPP. Consequently, even if all former Matterport stockholders voted together on all matters presented to CoStar Group stockholders from time to time, the former Matterport stockholders will exercise significantly less influence over CoStar Group after the completion of the Mergers relative to their influence over Matterport prior to the completion of the Mergers and will thus have less influence over the management and policies of CoStar Group after the Mergers than they currently have over the management and policies of Matterport.

Litigation challenging the Mergers may increase costs and prevent the Mergers from being completed within the expected timeframe, or from being completed at all.

CoStar Group, Matterport and members of their respective boards of directors may in the future be parties to various claims and litigation related to the Merger Agreement or the Mergers. One of the conditions to completion of the Mergers is the absence of any injunction, order or award restraining or enjoining, or otherwise prohibiting, the consummation of the Mergers. Accordingly, if any complaint that has been or is subsequently filed challenging the Mergers and a plaintiff is successful in obtaining an order enjoining completion of the Mergers, then such order may prevent the Mergers from being completed, or from being completed within the expected time frame.

For example, on June 3, 2024, a purported Matterport stockholder filed a complaint in the U.S. District Court for the Northern District of California, captioned Andrew Rose v. Matterport, Inc., et al., Case No. 5:24-cv-3313 (the “Rose Action”), naming Matterport and each member of the Matterport Board as defendants. The complaint alleges that CoStar Group’s Form S-4 Registration Statement filed with the SEC on May 21, 2024 is materially misleading and omits certain purportedly material information relating to the sales process, financial projections of Matterport and CoStar Group, the valuation analyses performed by Qatalyst Partners, and negotiations over the terms of post-transaction employment of certain Matterport employees. The complaint asserts violations of Section 14(a) of the Exchange Act and Rule 14a-9 promulgated thereunder against all

31

defendants, and violations of Section 20(a) of the Exchange Act against the Company’s Board. The complaint seeks, among other things, an injunction enjoining consummation of the Mergers, an order directing the individual defendants to issue a new Registration Statement, and an award of plaintiff’s costs of the action, including plaintiff’s reasonable attorneys’ and experts’ fees. Additionally, certain purported Matterport shareholders have delivered demand letters (the “Demands”) and a draft complaint alleging similar deficiencies or omissions regarding the disclosures made in the Registration Statement, and requesting relevant books and records. Matterport notes that: (i) the Rose Action may be amended; (ii) additional, similar complaints may be filed; or (iii) additional demand letters may be delivered. These events could prevent or delay completion of the Mergers and result in additional costs to Matterport. Matterport believes that the Rose Action and demand letters are without merit and intends to vigorously defend against them. Litigation could be time consuming and expensive, could divert the attention of CoStar Group’s and Matterport’s management away from their regular businesses, and, if adversely resolved against either CoStar Group or Matterport or their respective directors, could have a material adverse effect on CoStar Group’s and Matterport’s respective financial condition.

CoStar Group and Matterport will incur significant transaction costs in connection with the Mergers.

CoStar Group and Matterport expect to incur a number of non-recurring costs associated with the Mergers and combining the operations of the two companies. The significant, non-recurring costs associated with the Mergers include, among others, fees and expenses of financial, legal and other advisors and representatives, filing fees due in governmental agency-required filings and filing fees and printing and mailing costs for this proxy statement/prospectus. Some of these costs have already been incurred or may be incurred regardless of whether the Mergers are completed, including a portion of the fees and expenses of financial advisors, legal advisors and other advisors and representatives and filing fees for this proxy statement/prospectus. CoStar Group also will incur significant transaction fees and costs in connection with its formulating and implementing integration plans. CoStar Group continues to assess the magnitude of these costs, and additional unanticipated costs may be incurred in the Mergers and the integration of the two companies’ businesses. Although CoStar Group expects that the elimination of duplicative costs, as well as the realization of other efficiencies related to the integration of the businesses, should allow CoStar Group to offset integration-related costs over time, this net benefit may not be achieved in the near term, or at all.

The opinions of Matterport’s financial advisor will not reflect changes in circumstances between the signing of the Merger Agreement and the completion of the Mergers.

Matterport received an oral opinion from Qatalyst Partners on April 20, 2024, which was confirmed by delivery of a written opinion dated April 21, 2024, but has not obtained an updated opinion as of the date of this proxy statement/prospectus. Changes in the operations and prospects of CoStar Group or Matterport, general market and economic conditions and other factors that may be beyond the control of CoStar Group or Matterport, and on which Matterport’s financial advisors’ opinions were based, may significantly alter the value of CoStar Group or Matterport or the prices of the shares of CoStar Group Common Stock or of the shares of Matterport Common Stock by the time the Mergers are completed.

Qatalyst Partners’ opinion does not speak as of the time the Mergers will be completed or as of any date other than the date of such opinion. Because Matterport does not currently anticipate asking its financial advisor to update its opinion, the opinion will not address the fairness of the merger consideration or the Exchange Ratio, as applicable, from a financial point of view at the time the Mergers are completed. The Matterport Board’s recommendation that Matterport stockholders vote “FOR” approval of the Merger Proposal, the Adjournment Proposal and the non-binding Transaction Related Compensation Proposal, however, is made as of the date of this proxy statement/prospectus.

For a description of the opinion that Matterport received from its financial advisor, see the section entitled “The Mergers—Opinion of Qatalyst Partners.” A copy of Qatalyst Partners’ opinion is attached as Annex B to this proxy statement/prospectus.

32

Each of CoStar Group and Matterport are required, under certain circumstances, to pay a termination fee that if paid, may negatively affect such party’s financial results.

CoStar Group may be required, under certain circumstances in connection with a termination of the Merger Agreement, to pay Matterport a termination fee of $85 million, which could negatively affect CoStar Group’s financial condition and results of operations. Alternatively, Matterport may be required, under certain circumstances in connection with a termination of the Merger Agreement, to pay CoStar Group a termination fee of $50 million, which may materially and adversely affect Matterport’s financial results.

If the Mergers, taken together, do not qualify as a “reorganization” within the meaning of Section 368(a) of the Code, there may be adverse tax consequences to U.S. Holders of Matterport Common Stock.

For U.S. federal income tax purposes, the Mergers, taken together, are intended to qualify as a “reorganization” within the meaning of Section 368(a) of the Code. However, the completion of the Mergers is not conditioned on the Mergers qualifying for such tax treatment or upon the receipt of an opinion from counsel to that effect, and whether or not the Mergers will qualify for such tax treatment depends on facts that will not be known until the Mergers are completed. Neither CoStar Group nor Matterport has sought or will seek a ruling from the IRS regarding the U.S. federal income tax consequences of the Mergers. If, for any reason, the Mergers, taken together, were to fail to qualify as a “reorganization” within the meaning of Section 368(a), then a U.S. Holder of Matterport Common Stock generally would recognize gain or loss, as applicable, equal to the difference between the sum of the amount of cash and the fair market value of CoStar Group Common Stock received by the U.S. Holder in the Mergers and the U.S. Holder’s tax basis in its shares of Matterport Common Stock surrendered, and the U.S. Holder’s holding period of the shares of CoStar Group Common Stock received in the Mergers would begin on the day after the date of the Mergers.

Risk Factors Relating to CoStar Group Following the Mergers

The integration of Matterport into CoStar Group may not be as successful as anticipated.

CoStar Group and Matterport have operated and, until the completion of the Mergers will continue to operate independently. There can be no assurances that their businesses can be integrated successfully. It is possible that the integration process could result in the loss of key CoStar Group or Matterport employees, the loss of customers, the disruption of either company’s or both companies’ ongoing businesses, inconsistencies in standards, controls, procedures and policies, unexpected integration issues, higher than expected integration costs and an overall post-completion integration process that takes longer than originally anticipated. Specifically, the following issues, among others, must be addressed in integrating operations in order to realize the Mergers’ anticipated benefits so the combined company performs as expected:

33

In addition, at times the attention of certain members of either company’s or both companies’ management and resources may be focused on completion of the Mergers and the integration of the businesses of the two companies and diverted from day-to-day business operations or other opportunities that may have been beneficial to such company, which may disrupt each company’s ongoing business and the business of the combined company.

The combined company may not be able to retain customers, suppliers or distributors, or customers, suppliers or distributors may seek to modify contractual relationships with the combined company, which could have an adverse effect on the combined company’s business and operations. Third parties may terminate or alter existing contracts or relationships with CoStar Group or Matterport.

As a result of the Mergers, the combined company may experience impacts on relationships with customers, suppliers and distributors that may harm the combined company’s business and results of operations. Certain customers, suppliers or distributors may seek to terminate or modify contractual obligations following the Mergers whether or not contractual rights are triggered as a result of the Mergers. There can be no guarantee that customers, suppliers and distributors will remain with or continue to have a relationship with the combined company or do so on the same or similar contractual terms following the Mergers. If any customers, suppliers or distributors seek to terminate or modify contractual obligations or discontinue the relationship with the combined company, then the combined company’s business and results of operations may be harmed. Furthermore, the combined company may not have long-term arrangements with many of its significant suppliers. If the combined company’s suppliers were to seek to terminate or modify an arrangement with the combined company, then the combined company may be unable to procure necessary supplies from other suppliers in a timely and efficient manner and on acceptable terms, or at all.

CoStar Group and Matterport also have contracts with vendors, landlords, licensors and other business partners which may require CoStar Group or Matterport, as applicable, to obtain consent from these other parties in connection with the Mergers, or which may otherwise contain limitations applicable to such contracts following the Mergers. If these consents cannot be obtained, the combined company may suffer a loss of potential future revenue, incur costs and lose rights that may be material to the combined company’s business. In addition, third parties with whom CoStar Group or Matterport currently have relationships may terminate or otherwise reduce the scope of their relationship with either party in anticipation of the Mergers. Any such disruptions could limit the combined company’s ability to achieve the anticipated benefits of the Mergers. The adverse effect of any such disruptions could also be exacerbated by a delay in the completion of the Mergers or by a termination of the Merger Agreement.

The market price of CoStar Group Common Stock after completion of the Mergers will continue to fluctuate and may be affected by factors different from those affecting shares of Matterport Common Stock currently.

Upon completion of the First Merger, holders of Matterport Common Stock will become holders of shares of CoStar Group Common Stock. The market price of CoStar Group Common Stock may fluctuate significantly following consummation of the Mergers and holders of Matterport Common Stock could lose the value of their investment in CoStar Group Common Stock. The issuance of shares of CoStar Group Common Stock in the First Merger could on its own have the effect of depressing the market price for CoStar Group Common Stock. In addition, many Matterport stockholders may decide not to hold the shares of CoStar Group Common Stock they

34

receive as a result of the First Merger. Other Matterport stockholders, such as funds with limitations on their permitted holdings of stock in individual issuers, may be required to sell the shares of CoStar Group Common Stock they receive as a result of the First Merger. Such sales of CoStar Group Common Stock may take place shortly following the completion of the Mergers and could have the effect of depressing the market price for CoStar Group Common Stock.

Moreover, general fluctuations in stock markets, any decline of CoStar Group Common Stock in connection with fluctuations or pullback in the market related to post-acquisition special purpose acquisition companies, as well as fluctuations in the stock price of Matterport and CoStar Group’s publicly traded competitors in the 3D commercial real estate industry could have a material adverse effect on the market for, or liquidity of, the CoStar Group Common Stock, regardless of CoStar Group’s actual operating performance.

The businesses of CoStar Group differ from those of Matterport in important respects, including, particularly, expansion into camera manufacturing following the completion of the Mergers, and, accordingly, the results of operations of CoStar Group after the Mergers, as well as the market price of CoStar Group Common Stock, may be affected by factors different from those currently affecting the results of operations of Matterport. Following Closing, Matterport will be part of a larger company with other lines of business, so decisions affecting Matterport may be made based on considerations relating to the larger combined business as a whole rather than the Matterport business individually. For further information on the businesses of CoStar Group and Matterport and certain factors to consider in connection with those businesses, see the documents incorporated by reference into this proxy statement/prospectus and referred to under “Where You Can Find More Information” and the section titled “Information About the Companies.”

The future results of the combined company may be adversely impacted if CoStar Group does not effectively manage its expanded operations following completion of the Mergers.

Following completion of the Mergers, the size of the combined company’s business will be larger than the current size of either CoStar Group’s or Matterport’s respective businesses. CoStar Group’s ability to successfully manage this expanded business will depend, in part, upon management’s ability to implement an effective integration of the two companies and its ability to manage a combined business with a larger size and scope with the associated increased costs and complexity. CoStar Group’s management may not be successful, and CoStar Group may not realize the expected operating efficiencies, cost savings and other benefits currently anticipated from the Mergers.

Other Risks

CoStar Group and Matterport face other risks.

The risks listed above are not exhaustive, and you should be aware that, prior to and following the Mergers and the transactions contemplated by the Merger Agreement, CoStar Group and Matterport will face various other risks, including those discussed in reports filed by CoStar Group and Matterport with the SEC from time to time, such as those discussed under the heading “Risk Factors” in their respective, most recently publicly filed reports under the Exchange Act. In addition to those risks identified in Matterport’s periodic reports under the heading “Risk Factors,” and as described by Matterport in a Form 8-K filed with the SEC on May 29, 2024 and incorporated by reference herein, the Delaware Court of Chancery issued a decision in a post-trial opinion on January 10, 2022 in the matter of Brown v. Matterport, Inc. and Matterport Operating, LLC, finding that plaintiff William Brown had prevailed on the merits. On May 28, 2024, the Delaware Court of Chancery issued a ruling awarding Brown $79,092,133.12 plus pre- and post-judgment interests as damages. The judgment does not impact the merger consideration expected to be paid to Matterport stockholders in connection with the Mergers and Matterport anticipates appealing the ruling. Plaintiff William Brown may also choose to appeal the ruling. For more information, see “Where You Can Find More Information.”

35

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This proxy statement/prospectus and the documents incorporated by reference into this proxy statement/prospectus contain “forward-looking statements.” All statements other than statements of historical fact are “forward-looking statements” for purposes of federal and state securities laws. These forward-looking statements, which are based on current expectations, estimates and projections about the industry and markets in which CoStar Group, Matterport and their respective subsidiaries operate and beliefs of and assumptions made by CoStar Group’s management and Matterport’s management, involve uncertainties that could significantly affect the financial or operating results of CoStar Group, Matterport, or the combined company. Words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “seeks,” “estimates,” “will,” variations of such words and similar expressions are intended to identify such forward-looking statements. Such forward-looking statements include, but are not limited to, statements about the benefits of the proposed Mergers involving CoStar Group and Matterport, including future financial and operating results, plans, objectives, expectations and intentions. All statements that address operating performance, events or developments that CoStar Group expects or anticipate will occur in the future - including statements relating to creating value for stockholders, benefits of the proposed Mergers to clients, employees, stockholders and other constituents of the combined company, integrating CoStar Group and Matterport, cost savings and the expected timetable for completing the proposed Mergers - are forward-looking statements. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions that are difficult to predict. Although CoStar Group believes the expectations reflected in any forward-looking statements are based on reasonable assumptions, CoStar Group can give no assurance that its expectations will be attained and, therefore, actual outcomes and results may differ materially from what is expressed or forecasted in such forward-looking statements. Some of the factors that may affect outcomes and results include, but are not limited to, those set forth under the section entitled “Risk Factors” of this proxy statement/prospectus:

36

Neither CoStar Group nor Matterport undertakes any duty to update any forward-looking statements appearing in this document, except as may be required by applicable securities laws.

37

INFORMATION ABOUT THE COMPANIES

CoStar Group, Inc.

CoStar Group, Inc. is a leading provider of information, analytics and online marketplaces to the commercial real estate industry in the U.S. and U.K. based on the fact that it offers the most comprehensive commercial real estate database available; has the largest research department in the industry; own and operate leading online marketplaces for commercial real estate and apartment listings in the U.S. based on the numbers of unique visitors and site visits per month; and provides more information, analytics and marketing services than any of our competitors. It has created and compiled a standardized platform of information, analytics and online marketplace services where industry professionals and consumers of commercial real estate, including apartments, and the related business communities can continuously interact and facilitate transactions by efficiently accessing and exchanging accurate and standardized real estate-related information. Its service offerings span all commercial property types, including office, retail, industrial, multifamily, commercial land, mixed-use and hospitality. CoStar Group manages it business geographically in two operating segments, with its primary areas of measurement and decision-making being North America, which includes the U.S. and Canada, and International, which primarily includes Europe, Asia-Pacific and Latin America.

CoStar Group’s principal executive office is located at 1331 L Street, NW, Washington, D.C. 20005, and its telephone number is (202) 346-6500.

CoStar Group Common Stock is listed on the Nasdaq Global Select Market, trading under the symbol “CSGP.”

Additional information about CoStar Group and its subsidiaries is included in documents incorporated by reference into this proxy statement/prospectus. For more information, see “Where You Can Find More Information.”

Matrix Merger Sub, Inc.

Matrix Merger Sub, Inc, a Delaware corporation, is a direct, wholly owned subsidiary of CoStar Group. Merger Sub I was formed by CoStar Group solely for the purpose of engaging in the transactions contemplated by the Merger Agreement. Merger Sub I has not conducted any business activities, has no assets, liabilities or obligations and has conducted its operations solely as contemplated by the Merger Agreement. Its principal executive offices are located at c/o CoStar Group, Inc., 1331 L Street, NW Washington, DC 20005, and its telephone number is (202) 346-6500.

Matrix Merger Sub II LLC

Merger Sub II LLC, a Delaware limited liability company and a direct, wholly owned subsidiary of CoStar Group, was formed solely for the purpose of facilitating the Second Merger. Merger Sub II has not carried on any activities or operations to date, except for those activities incidental to its formation and undertaken in connection with the transactions contemplated by the Merger Agreement. By operation of the Second Merger, the Surviving Corporation will be merged with and into Merger Sub II, with Merger Sub II surviving the Second Merger as a wholly owned subsidiary of CoStar Group.

Matterport, Inc.

Matterport is leading the digitization and datafication of the built world. Matterport was incorporated in 2011 and is headquartered in Sunnyvale, California. Matterport’s website address is www.matterport.com. Matterport’s Internet website address is provided as an inactive textual reference only. The information contained on Matterport’s Internet website is not incorporated into, and does not form a part of, this proxy statement/prospectus or any other report or document on file with or furnished to the SEC.

38

Matterport’s technology platform uses spatial data collected from a wide variety of digital capture devices to transform physical buildings and spaces into dimensionally accurate, photorealistic digital twins that provide its subscribers access to valuable building information and insights. For more than a decade, Matterport’s platform has set the standard for digitizing, accessing and managing buildings, spaces and places online. This has resulted in the world’s largest and most accurate library of spatial data with more than 40.7 billion square feet digitized to date. Matterport delivers value to its customers by leveraging proprietary artificial intelligence insights to enhance customer experiences, improve operational efficiency, lower costs associated with promoting and operating buildings and accelerate business. Matterport believes the digitization and datafication of the built world will fundamentally change the way people interact with buildings and the physical spaces around them.

Matterport’s spatial data platform delivers value across a diverse set of industries and use cases by unlocking a rich set of insights about properties and spaces worldwide. Open access to Matterport’s structured spatial data is enabling new opportunities and business models for hospitality, facilities management, insurance, construction, real estate and retail, among others. Large retailers can manage thousands of store locations remotely, real estate agencies can provide virtual open houses for hundreds of properties and thousands of visitors at the same time, property developers can monitor the entirety of the construction process with greater detail and speed, and insurance companies can more precisely document and evaluate claims and underwriting assessments with efficiency and precision. Matterport delivers the critical digital experience, tools and information that matter to its subscribers about properties of virtually any size, shape, and location worldwide. As Matterport continues to transform buildings into data, Matterport is extending its spatial data platform to further transform property planning, development, management and intelligence for its subscribers across industries to become the de facto building and business intelligence engine for the built world. Matterport believes the demand for spatial data and resulting insights for enterprises, businesses and institutions across industries, including real estate, architecture, engineering and construction, retail, insurance and government, will continue to grow rapidly.

Matterport’s innovative 3D capture products, the Pro3 and Pro2 Cameras, have played an integral part in shaping the 3D building and property visualization ecosystem. The Pro3 and Pro2 Cameras have driven adoption of Matterport’s solutions and have generated the unique high-quality and scaled data set that has enabled Cortex, Matterport’s proprietary AI software engine, to become the pioneering engine for digital twin creation. With this data advantage initially spurred by the Pro2 Camera, Matterport has developed a capture device agnostic platform that scales and can generate new building and property insights for its subscribers across industries and geographies.

Matterport’s offerings include software subscription, data licensing, services and product hardware. As of March 31, 2024, Matterport’s subscriber base included over 26% of Fortune 1000 companies, with less than 10% of its total subscription revenue generated from its top 10 subscribers. Matterport expects more than 80% of its revenue to come from software subscription and data license solutions by 2026.

Matterport’s principal executive office is located at 352 East Java Drive, Sunnyvale, CA 94089 and its telephone number is (650) 641-2241.

Matterport Common Stock is traded on the Nasdaq Global Market under the symbol “MTTR.”

For more information about Matterport, please visit Matterport’s Internet website at www.matterport.com. Matterport’s Internet website address is provided as an inactive textual reference only. The information contained on Matterport’s Internet website is not incorporated into, and does not form a part of, this proxy statement/prospectus or any other report or document on file with or furnished to the SEC. Additional information about Matterport and its subsidiaries is included in documents incorporated by reference in this proxy statement/prospectus. Please see “Where You Can Find More Information.”

39

THE MERGERS

The following is a discussion of the Mergers and the material terms of the Merger Agreement by and between CoStar Group and Matterport. You are urged to read the Merger Agreement carefully and in its entirety, a copy of which is attached as Annex A to this proxy statement/prospectus and incorporated by reference into this proxy statement/prospectus.

Background of the Mergers

The terms of the Merger Agreement were the result of extensive negotiations between Matterport, CoStar Group and their respective affiliates and representatives. The following is a brief description of certain key events and contacts that led to the signing of the Merger Agreement.

The Matterport Board and its management regularly review and assess Matterport’s performance, share price, strategy, financial position, opportunities and risks in light of current business and economic conditions, as they may affect Matterport’s strategic goals and plans. As a matter of practice, the Matterport Board and its senior management, together with their professional advisors, regularly review and evaluate a wide range of strategic opportunities for business combinations, acquisitions and other financial and strategic alternatives for Matterport, including continuing as a standalone company, with a view to maximizing stockholder value.

CoStar Group has been a customer of Matterport since January 2015. During the period between December 2022 and September 2023, Matterport executives and CoStar Group executives met periodically to discuss further deepening the companies’ existing commercial relationship in light of CoStar Group’s acquisition of Homes.com in 2021 and its increasing integration of Matterport products and services into CoStar Group’s digital offerings.

On May 15, 2023, Mr. Andrew Florance, Chief Executive Officer of CoStar Group, contacted the office of Matterport’s CEO, Mr. R.J. Pittman to request a meeting. Mr. Pittman accepted the request and met in person with Mr. Florance in San Francisco on May 18, 2023. Along with two additional CoStar Group executives, Mr. Florance shared an overview of CoStar Group’s priorities and Mr. Pittman shared an overview of Matterport’s priorities as well as an overview of Matterport’s latest product and technology capabilities. Mr. Pittman then discussed potential opportunities to enhance CoStar Group’s offerings with Matterport technologies. The meeting concluded with mutual interest in scheduling a follow-up meeting.

On June 15, 2023, Mr. Florance returned to San Francisco for general business purposes and to meet with Mr. Pittman for a follow-up meeting to discuss, among other things, commercial opportunities to expand the current business relationship. Mr. Pittman discussed several technology initiatives and commercial approaches with joint marketing potential. In response, Mr. Florance agreed that the commercial opportunities were potentially compelling and inquired as to whether Matterport would be open to receiving an acquisition offer. In response, Mr. Pittman stated that Matterport was not looking for a buyer but was otherwise neutral on the question, and the meeting concluded. No price or other specific terms of any proposed transaction were discussed during the meeting.

On September 18, 2023, Mr. Florance met with Mr. Pittman and delivered an unsolicited, non-binding written acquisition proposal. The proposal expressed CoStar’s interest to acquire all outstanding shares of Matterport Common Stock at a price per share of $4.20 to $4.60, with consideration comprised of 50% cash and 50% newly issued shares of CoStar Group Common Stock. The proposed acquisition price represented a 79% to 96% premium to the Closing trading price of Matterport Common Stock on September 15, 2023. Other aspects of the proposal included the absence of any financing contingency and a request for a 45-day exclusivity period to complete its due diligence.

On September 19, 2023, Mr. Pittman provided CoStar Group’s acquisition proposal to the Matterport Board and informed the Matterport Board that he would be scheduling a meeting to discuss the proposal. On

40

September 21, 2023, the Matterport Board, together with certain members of senior management and a representative of Foley & Lardner LLP (“Foley”), held a special meeting by video conference. At the meeting, Mr. Pittman reported on the unsolicited acquisition proposal from CoStar Group and recounted his discussions in the June 15 and September 18 meetings with Mr. Florance that led to the proposal. Representatives of Foley reviewed the fiduciary duties owed by the directors under applicable law in connection with their consideration of CoStar Group’s proposal and any other strategic alternatives. Matterport’s Board reconvened a special meeting on September 23, 2023 to explore potential responses to CoStar Group’s proposal and discussed Matterport’s engagement of a financial advisor to assist in considering the proposal and other potential strategic alternatives. The directors authorized Mr. Pittman to begin a search for potential financial advisors. Matterport evaluated its investment banking relationships, including with Qatalyst Partners LP (“Qatalyst Partners”), to determine the qualifications and experiences of each to serve as Matterport’s financial advisor in connection with CoStar Group’s proposal and potential strategic alternatives. The Matterport Board authorized management to pursue negotiations with Qatalyst Partners in connection with preparing to potentially engage Qatalyst Partners as a financial advisor.

On October 4, 2023, the Matterport Board, after review and discussion of Qatalyst Partners’ qualifications, authorized Matterport’s management to engage Qatalyst Partners to act as Matterport’s exclusive financial advisor in connection with the proposed transaction. On October 4, Matterport executed an engagement letter formalizing such engagement of Qatalyst Partners. Qatalyst Partners was selected to act as Matterport’s financial advisor based on Qatalyst Partners’ qualifications, expertise and reputation, as well as its knowledge of Matterport’s business and the industry in which it operates.

On October 9, 2023, the Matterport Board, together with certain members of Matterport’s senior management, met with representatives of Qatalyst Partners and Foley by video conference to continue discussions regarding CoStar Group’s proposal. Representatives of Qatalyst Partners reviewed with the Matterport Board and discussed Matterport’s preliminary management projections, as prepared by Matterport’s management team for use in its analysis, analyst targets and valuations, trading performance, preliminary valuation perspectives, and strategic alternatives to the proposed transaction, including possible business combination transactions with other third parties. Foley again led a discussion regarding the Board’s fiduciary duties, possible responses to CoStar Group’s bid and various measures that Matterport could take in response thereto. After discussion regarding a range of potential responses to CoStar Group, as well as the feasibility of a limited market check, the Matterport Board determined that CoStar Group’s proposed acquisition price of $4.20 to $4.60 per share was inadequate and that it was not an appropriate time to engage in a broader process to sell Matterport. The directors then instructed Mr. Pittman to convey to Mr. Florance that, while Matterport was not for sale and did not currently intend to put itself up for sale, Matterport took CoStar Group’s September 18, 2023 proposal seriously, was willing to engage with CoStar Group and offer to provide additional information under a confidentiality agreement and engage in a discussion that could lead CoStar Group to meaningfully improve its offer.

At the direction of the Matterport Board, Mr. Pittman called Mr. Florance on October 11, 2023 and relayed the message of the Matterport Board and informed him that the range of CoStar Group’s proposed offer to acquire Matterport was too low but proposed that Matterport and CoStar Group engage in further discussions regarding potential value creation.

On October 12, 2023, Mr. Matthew Zinn, Matterport’s Chief Legal Officer, sent Mr. Gene Boxer, CoStar Group’s General Counsel, a draft mutual confidentiality agreement to facilitate discussions and the disclosure of information between Matterport and CoStar Group. The parties and their respective counsel negotiated, and the parties executed, a mutual confidentiality agreement on October 16, 2023. The confidentiality agreement contained customary “standstill” restrictions on CoStar Group with a customary “fall-away” provision that rendered the standstill inapplicable if Matterport were to enter into a definitive agreement to sell more than 50% of its capital stock and did not include a “don’t ask, don’t waive” provision.

On October 18, 2023, Matterport, CoStar Group’s respective senior management teams and CoStar Group’s financial advisor, J.P. Morgan Securities LLC (“J.P. Morgan”) held an all-day meeting, during which the parties

41

discussed Matterport’s vision and strategy as a standalone business, potential synergies between the companies, how CoStar Group could accelerate Matterport’s growth, and how a business combination with Matterport could assist CoStar Group in achieving CoStar Group’s strategic objectives.

On October 20, 2023, Matterport’s Board met to receive a briefing from Mr. Pittman regarding the October 18 discussions between Matterport and CoStar Group executives.

On October 23 and October 30, 2023, at the direction of Matterport’s senior management, representatives of Qatalyst Partners spoke with J.P. Morgan. In those conversations, representatives of J.P. Morgan conveyed to Qatalyst Partners that CoStar Group would need to obtain additional diligence information from Matterport, including a financial model, in order to support a potentially improved CoStar Group proposal. On October 30, 2023, J.P. Morgan sent Qatalyst Partners a high-priority data request list. On November 1, 2023, Messrs. Pittman and Florance engaged in a discussion about the scope of diligence necessary for CoStar Group to submit a revised proposal to acquire Matterport. Subsequent to receiving the data request list and throughout November 2023, Matterport and CoStar Group executives, along with their respective financial advisors, engaged in additional discussions and evaluations regarding Matterport’s financial model and assumptions therein, as well as other due diligence matters.

On November 1, 2023, Messrs. Florance and Pittman discussed the status of CoStar Group’s due diligence. Mr. Pittman also informed Mr. Florance that Matterport had a regularly scheduled board meeting on November 9 and inquired as to whether CoStar Group would be providing a revised proposal prior to that date. Later that day, representatives of Qatalyst Partners contacted representatives of J.P. Morgan to reinforce Matterport’s desire to facilitate CoStar Group’s due diligence and receive an updated proposal prior to Matterport’s November 9 board meeting.

On November 3, 2023, Mr. Pittman contacted Mr. Florance by telephone to discuss the prioritization of due diligence requests and next steps with respect to the strategic discussions.

On November 6, 2023, members of CoStar Group management and representatives of J.P. Morgan requested that members of Matterport’s management and representatives of Qatalyst Partners facilitate a technology-focused due diligence call. This call took place by video conference the following day.

On November 8, 2023, Mr. Pittman contacted Mr. Florance to inquire as to whether CoStar Group would be delivering a revised acquisition offer in advance of the Matterport’s regularly scheduled board meeting set for November 9, 2023.

On November 9, 2023, at its regularly scheduled board meeting, Mr. Pittman provided an update on strategic discussions with CoStar Group. Mr. Pittman reported that since the last Board meeting on October 20, 2023, CoStar Group had conducted additional due diligence and the parties had engaged in additional discussions, but CoStar Group had not provided an updated proposal.

On November 14, 2023, representatives of Qatalyst Partners spoke by phone with representatives of J.P. Morgan to discuss the status and potential next steps with respect to the transaction, including the scope of additional due diligence requests that CoStar Group would need to conduct prior to forming a revised view on value. Over the next several days, the two companies engaged in additional due diligence discussions.

On November 28, 2023, Mr. Scott Wheeler, CoStar Group’s Chief Financial Officer, contacted Mr. Fay, Matterport’s Chief Financial Officer, to update him on the diligence process and indicated that Mr. Florance would contact Mr. Pittman the following week regarding CoStar Group’s valuation of Matterport.

On December 6, 2023, Messrs. Florance and Wheeler contacted Messrs. Pittman and Fay by telephone, and orally delivered an acquisition offer of $4.50 to $5.00 per share.

42

On December 12, 2023, in advance of CoStar Group’s regularly scheduled board meeting the next day, Mr. Pittman called Mr. Florance to inform him of Mr. Pittman’s belief that the Matterport Board might be willing to entertain a proposal of $6.85 per share. Subsequent to this conversation, Matterport management, with the assistance of Qatalyst Partners, prepared and conveyed to CoStar Group materials outlining potential value creation to CoStar Group resulting from the proposed transaction and supporting a potential $6.85 per share offer.

On December 20, 2023, Mr. Florance told Mr. Pittman in a telephone call that while he did not yet have approval from CoStar Group’s Board, he was willing to advocate for an acquisition price of $5.50 per share.

On January 4, 2024, Mr. Pittman called Mr. Florance and informed him that, based on the strategic value and the long-term prospects of Matterport’s business, Mr. Pittman would only be supportive of a price that was $6.00 per share or greater. On January 9, 2024, Mr. Florance called Mr. Pittman and told him that CoStar Group was still evaluating Matterport’s proposed range and that he did not yet have authorization to make a revised proposal.

On January 31, 2024, Messrs. Pittman and Florance met by video conference to continue the discussion on price. In that conversation, Mr. Florance made a verbal proposal of $5.50 per share, noting that it was CoStar Group’s best offer and the maximum price he was authorized to offer by the CoStar Group Board. The following day, in a special meeting of the Matterport Board with certain members of Matterport senior management, Mr. Pittman briefed the directors on the discussions with CoStar Group and its verbal offer of $5.50 per share.

Following the board meeting, under the instructions of the Matterport Board, Mr. Pittman called Mr. Florance on February 5, 2024 and informed him that Matterport would review CoStar Group’s latest proposal and asked that CoStar Group’s revised offer be tendered in writing. Mr. Pittman also advised that any proposed transaction would need to be completed without delay or interference to Matterport’s ongoing business operations and that the definitive agreements reflect balanced terms, certainty of closing and customary protections for Matterport, such as a reverse termination fee.

On February 7, 2024, Mr. Florance delivered to Mr. Pittman a non-binding written letter of intent setting forth CoStar Group’s revised proposal of $5.50 per share, subject to completion of due diligence, consisting of $2.75 per share in cash and $2.75 per share in CoStar Group Common Stock, and proposing to commit to include a reasonable and customary termination fee in the event antitrust approval is not obtained, a 45-day exclusivity period to complete its due diligence and finalize negotiation of definitive transaction documents, which CoStar Group could extend for an additional 21 days if the parties were working in good faith and there were no changes to the proposal’s key terms. At the Matterport Board’s direction, Matterport executives discussed the letter of intent with representatives of Foley and Qatalyst Partners.

On February 8, 2024, the Matterport Board held a special meeting with certain members of Matterport senior management and representatives of Foley and Qatalyst Partners to discuss CoStar Group’s February 7, 2024 proposal and discussed a possible response to CoStar Group’s written offer. Representatives of Foley discussed the legal aspects of the proposal, including expected regulatory review, and further reminded the Matterport Board of its fiduciary duties, and representatives of Qatalyst Partners made a presentation on certain aspects of CoStar Group’s February 7, 2024 proposal as well as certain matters related to Matterport’s standalone value and a potential combination with CoStar Group. Matterport’s directors engaged in a wide-ranging discussion, including the benefits and drawbacks of continuing as a standalone business, the competitive landscape, Matterport’s future prospects as a standalone entity and alternative strategic transactions that Matterport could pursue. In addition, the Matterport Board discussed with its advisors whether Qatalyst Partners should contact other potential bidders prior to granting exclusivity to CoStar Group and concluded that the risks of doing so, including the potential that Matterport’s consideration of a potential transaction might become known to the public, outweighed the potential benefits. The Matterport Board further indicated that it would be

43

important to obtain significant protection regarding the value of the stock portion of the consideration and that CoStar Group should bear any regulatory risk associated with any antitrust approval and agree to a customary reverse termination fee. After the meeting, Matterport sent CoStar Group a marked-up version of CoStar Group’s letter of intent which included additional detail as to the valuation of the stock component of the consideration, including a floating exchange ratio, which would provide for the payment of a number of CoStar Group shares having a value at Closing of $2.75 per share. Matterport’s revisions to the letter of intent also specified that CoStar Group pay Matterport a termination fee equal to 6% of the equity value of the proposed transaction and that the topping fee payable by Matterport would be 3% of the equity value of the proposed transaction. Additionally, Matterport proposed that the exclusivity period be shortened to 30 days from the acceptance of the proposal and be extended only by mutual agreement for an additional 15 days.

On February 12, 2024, members of Matterport’s senior management, and members of CoStar Group senior management held several meetings by video conference to discuss the terms of the letter of intent. Later that day, J.P. Morgan and Qatalyst Partners held a video conference to discuss the terms of the letter of intent.

On February 14, 2024, prior to Matterport’s regularly scheduled board meeting that day, Mr. Pittman received from Mr. Florance a revised letter of intent in which, among other things, CoStar Group (i) accepted the 30-day exclusivity period, subject to the exclusivity period beginning on the date that the parties agreed Matterport had substantially provided certain diligence materials requested with the proposal and a potential 15 day extension which would be mutually agreed; (ii) proposed a symmetrical collar to the floating share exchange ratio at Closing that Matterport had proposed; and (iii) proposed a reverse termination fee by CoStar Group of $85 million, and a termination fee by Matterport of $50 million.

At the regularly scheduled board meeting on February 14, 2024, the Matterport Board, among other things, received an overview of Matterport’s results for its most recent fiscal year. The Matterport Board, Matterport’s senior management, and representatives of Qatalyst Partners and Foley further engaged in a discussion on the specific terms of CoStar Group’s revised offer – including the fact that the offer of $5.50 per share represented a premium of 143% to the closing price of Matterport Common Stock on February 13, 2024 and potential alternatives. Representatives of Foley also provided a review of the Matterport Board’s fiduciary duties under applicable law in connection with its review and consideration of any potential transaction involving Matterport. Representatives of Qatalyst Partners reviewed certain potential acquirors for Matterport, the merits and considerations for each, and the potential benefits and drawbacks of an outreach to other potential acquirors. Representatives of Qatalyst Partners discussed that the likelihood that any other potential acquiror would have the ability and interest in pursuing a transaction with Matterport at this time at a value commensurate with that contemplated by CoStar Group’s February 14, 2024 proposal was relatively low and that a leak could be detrimental to the current negotiations with CoStar Group. It was also noted that informing CoStar Group that Matterport was not engaging in discussions with other potential acquirors was consistent with previous statements that Matterport was not actively looking for a sale. Based on these discussions and other considerations, the Matterport Board determined that it should not engage in an outreach to other potential acquirors at that time, and approved the execution of the letter of intent, subject to clarifying the language of the exclusivity period such that it ended on a specified date, to be no longer than 45 days. Also on February 14, 2024, the Matterport Board executed an Action by Written Consent approving the execution of CoStar Group’s letter of intent, with one change to reflect a change to the exclusivity period.

On February 16, 2024, Matterport signed CoStar Group Group’s nonbinding (other than as to exclusivity) letter of intent with one revision to the exclusivity period, which was revised to provide for a termination on March 25, 2024, with an extension, subject to mutual agreement, by up to 15 days if CoStar Group was proceeding in good faith and confirms no changes to the key terms of its proposal. Under the letter, neither party was bound to consummate a transaction.

Beginning on February 21, 2024, CoStar Group and its outside counsel, Latham & Watkins LLP (“Latham”), conducted due diligence on Matterport through (i) extensive review of the virtual data room

44

information provided pursuant to a diligence request list delivered by CoStar Group to Matterport on February 15, 2024, and (ii) discussions with Matterport representatives regarding business prospects, Matterport’s outstanding litigation, and other due diligence matters. The virtual data room was iteratively updated with additional due diligence information throughout the ensuing transaction negotiations.

On February 28, 2024, representatives of CoStar Group, including Mr. Florance, Frank Simuro, CoStar Group’s Chief Technology Officer, and Lisa Ruggles, CoStar Group’s Senior Vice President of Global Operations, and representatives of Matterport, including Mr. Pittman, Mr. Gausebeck, Mr. Remley, and Mr. Tulsi held in-person meetings at Foley’s offices to discuss certain due diligence matters, including Matterport’s presentation of information concerning its products, technology and service network. Over the following weeks, CoStar Group and Matterport engaged in confirmatory due diligence on each other.

On March 5, 2024, Latham sent Foley an initial draft of the Merger Agreement.

On March 7, 2024, Matterport’s Board and members of the management team met with representatives of Foley to review the initial draft of the Merger Agreement and each of the key issues in the draft. Among other things, the initial CoStar Group draft provided that the cash portion of the purchase price would be reduced by the potential exposure from pending lawsuits against Matterport in Delaware, with such reduction to be issued in the form of a contingent value right upon successful resolution of such matters. The Board noted the value of the contingent value right which would only be realized by Matterport stockholders to the extent that CoStar Group prevailed in the various litigations and would be reduced by the amount of actual losses suffered in such lawsuits.

On March 11, 2024, Messrs. Pittman and Zinn contacted Messrs. Wheeler and Boxer to discuss the issues in CoStar Group’s initial draft of the Merger Agreement. During their conversation, Matterport executives told CoStar Group that the signed letter of intent did not contemplate a contingent value right and Matterport’s position was that the price set forth in the signed letter of intent was $5.50 per share without any portion of the amount being contingent. Pending resolution of this issue, Matterport paused due diligence calls until CoStar Group could confirm that it would proceed without the contingent value right. Later that day, Qatalyst Partners contacted J.P. Morgan to reiterate that message.

On March 14, 2024, Messrs. Pittman and Florance held a teleconference, and Mr. Florance confirmed that CoStar Group would remove the concept of a contingent value right in the Merger Agreement and leaving the proposal at $5.50 per share. Matterport resumed its cooperation with CoStar Group on its due diligence of Matterport, and Matterport instructed Foley to prepare a revised draft of the Merger Agreement.

On March 17, 2024, a representative of Qatalyst Partners contacted representatives of J.P. Morgan to confirm whether CoStar Group remained on track to sign prior to March 25, 2024, the termination date of the exclusivity period. Representatives of J.P. Morgan communicated that given the pause of due diligence, it was likely that CoStar Group would need additional time to complete due diligence.

On March 18, 2024, Latham delivered an initial draft of a voting agreement to be entered into by certain stockholders. Latham and Foley continued to exchange drafts of the voting agreement over the following weeks, during which they had several telephonic meetings to discuss the terms of the draft voting agreement.

On March 19, 2024, Foley sent to Latham a revised draft of the Merger Agreement. Foley’s revised draft included, among other things, (i) a 30-day “go-shop” provision, with a reduced break-up fee of $25 million for termination resulting from alternative proposals that were submitted during the go-shop period, (ii) tax-efficient structuring of the transaction providing for guaranteed tax-free treatment of the stock consideration, (iii) more stringent regulatory covenants, (iv) a condition to Matterport’s obligation to close that CoStar Group not have experienced a material adverse effect, and (v) other changes related to Matterport Board’s ability to comply with its fiduciary obligations.

45

While CoStar Group and its representatives conducted due diligence related to Matterport, Matterport’s management, together with representatives of Foley and Qatalyst Partners, conducted due diligence as to certain matters related to CoStar Group. In addition to reviewing publicly available information, members of the Matterport management team and their advisors participated in due diligence sessions in which members of CoStar Group management team provided answers to questions presented by Matterport.

On March 21, 2024, CoStar Group requested that Matterport agree to extend the exclusivity period by 15 days.

On March 22, 2024, Matterport’s Board held a special meeting at which representatives of Qatalyst Partners and Foley were present. Mr. Pittman provided a status update on the parties’ diligence process, the negotiations with CoStar Group on the Merger Agreement and other transaction documents, including CoStar Group’s request to extend exclusivity and the anticipated transaction timeline. Mr. Pittman also summarized for Matterport’s Board the results of the due diligence meetings and investigation into CoStar Group. Representatives of Foley reminded the Matterport Board of its fiduciary duties. Then, representatives of Foley presented an update on the material terms of the Merger Agreement, including, among other things, (i) the merger consideration and tax treatment of CoStar Group shares received, (ii) the treatment of equity awards, (iii) the voting agreement that key executives and directors would be required to sign, (iv) interim operating covenants, (v) non-solicitation and “go-shop” provisions, (vi) consequences upon changes in Matterport Board’s recommendations, (vii) CoStar Group’s matching rights with respect to a superior proposal, (viii) Matterport’s request for a condition to Matterport’s obligations to close that CoStar Group not have experienced a material adverse effect, and (ix) termination rights and fees. Mr. Zinn, together with representatives of Foley, summarized Matterport and CoStar Group’s respective positions on the outstanding issues. The Board then discussed the potential compromises that Matterport and CoStar Group would need to make in order to reach agreement but reiterated the importance of the Matterport Board’s fiduciary duties. The Matterport Board further examined the due diligence and negotiations to date and authorized an extension of the exclusivity period for 15 days. Thereafter, representatives of Qatalyst Partners presented materials on the collar mechanics and sensitivity analysis illustrating how the collar could impact the value of the consideration under various CoStar Group Common Stock trading price scenarios.

In light of the on-going diligence and number of open issues in the Merger Agreement, on March 25, 2024, Matterport and CoStar Group agreed in writing to extend the exclusivity period through April 9, 2024.

On March 27, 2024, Latham sent a revised draft of the Merger Agreement to Foley. In that revised draft, among other things, CoStar Group (i) proposed a 5% symmetrical collar, with a midpoint price equal to the average of the volume weighted average prices (“VWAP”) of CoStar Group for the 10 consecutive trading days ending the trading day prior to the signing of the Merger Agreement, (ii) agreed to a tax-efficient structure only to the extent such structure would not result in CoStar Group issuing more consideration in CoStar Group Common Stock than as required pursuant to the aforementioned collar, (iii) reverted on certain non-solicitation and “go-shop” provisions, (iv) limited Matterport’s Board’s ability to consider non-financial factors of potential superior proposals, and (v) rejected Matterport’s request for a condition to Matterport’s obligation to close that CoStar Group not have experienced a material adverse effect.

On March 28, 2024, representatives of Latham and Foley had multiple calls to discuss the open issues in the draft Merger Agreement. In the negotiations, Latham and Foley, among other items, discussed the fiduciary exceptions to the “no-shop” and board recommendation covenants, Matterport’s interim operating covenants, and Matterport’s request for a condition to Matterport’s obligation to close that CoStar Group not have experienced a material adverse effect.

On March 29, 2024, Mr. Pittman contacted Messrs. Florance, Wheeler and Boxer with a summary of the material open items in the parties’ diligence process and transaction documents, along with target deadlines for each workstream. Mr. Pittman also separately contacted Mr. Florance to discuss the key issues in the Merger Agreement including, among other things, the collar mechanics and the non-solicitation provisions.

46

Late in the evening of March 29, 2024, Foley delivered to Latham a revised Merger Agreement. The revised draft proposed, among other changes, a wider 13% symmetrical collar and a midpoint price equal to the average of the VWAPs of CoStar Group for the 10 consecutive trading days ending on April 5, 2024. On March 31, 2024, Mr. Pittman emailed Messrs. Florance, Wheeler and Boxer with a proposed timeline for various pre-signing workstreams.

On April 1, 2024, representatives of Foley and Latham held a call to discuss (i) the 13% symmetrical collar, (ii) Matterport’s proposed language that CoStar Group refrain from undertaking any other acquisitions that would imperil regulatory review of the current transaction with Matterport and (iii) the definition of “Good Reason” in Matterport’s executive severance plan. On the evening of April 3, 2024, Latham sent to Foley a revised Merger Agreement, with revisions that addressed CoStar Group’s issues raised in the April 1 call between Foley and Latham. In Latham’s revised draft of the Merger Agreement, CoStar Group countered Matterport’s proposal of a 13% symmetrical collar with a narrower 10% symmetrical collar.

Along with the revised Merger Agreement, Latham also sent Foley a proposed term sheet to amend and restate the existing commercial agreement between Matterport and CoStar Group, noting that CoStar Group sought to finalize the updated commercial terms concurrently with the signing of the Merger Agreement. Additionally, CoStar Group proposed that all Matterport executive officers sign a “Good Reason” waiver, whereby such officers would acknowledge that any change in the officers’ titles, authority, reporting relationships and duties, solely due to Matterport becoming a division of CoStar Group as a result of the closing of the transaction, would not constitute “Good Reason” under Matterport’s executive severance plan.

On April 4, 2024, Qatalyst Partners provided Matterport with a conflicts disclosure letter, which confirmed the absence of any conflicts in Matterport’s engagement of Qatalyst Partners in connection with the proposed transaction with CoStar Group.

On April 5, 2024, the Matterport Board and representatives of Foley and Qatalyst Partners met to discuss the status of the transaction. Mr. Pittman and representatives of Foley updated the Matterport Board on recent events, in particular CoStar Group’s proposal relating to the commercial agreement and the “Good Reason” waiver. Mr. Pittman, together with representative of Foley, summarized the key outstanding items and the key terms of the revised Merger Agreement and other transaction documents, each of which had been shared with Matterport’s Board. The Matterport Board, together with representatives of Foley and Qatalyst Partners, engaged in a discussion of (i) certain matters related to Matterport’s standalone value and a potential combination with CoStar Group, (ii) the results of the due diligence conducted on CoStar Group and (iii) certain other terms of the transaction, including acceptance of the 10% collar but shortening the VWAP period to 5 consecutive trading days from 10 consecutive trading days.

After the Matterport Board meeting on April 5, 2024, negotiations ensued on each of the commercial agreement, the Good Reason waiver and the terms of a restrictive covenant agreement with certain executive officers of Matterport, which CoStar Group had proposed.

In the morning of April 8, 2024, Matterport’s Board met to review the status of the potential transaction. Members of Matterport’s senior management team and representatives of Foley and Qatalyst Partners were also present. Mr. Pittman provided an overview of the discussions with CoStar Group since the March 22, 2024 board meeting. Representatives of Foley provided an update on the status of the Merger Agreement and other transaction agreements, copies of which were each provided to the directors in advance of the meeting. The presentation led by representatives of Foley covered, among other items, certain updates to the Merger Agreement that have been made since the directors last reviewed a copy of the Merger Agreement, SEC and other regulatory filings required and potential timing scenarios, termination provisions, signing and closing conditions and the preparation for a special stockholders’ meeting necessary for a vote to approve the proposed transaction. Thereafter, representatives of Foley discussed the directors’ fiduciary duties and responsibilities and the steps to address any potential competing or superior proposals under the non-solicitation provisions of the

47

draft Merger Agreement; and discussed that the value of the CoStar Group Common Stock at Closing could impact the tax free reorganization structure. In addition, Director Repo presented her conclusion, based on a review of key pleadings and discussions with Matterport counsel, that derivative claims recently filed by certain shareholders on behalf of Matterport had minimal value as an asset of Matterport, and were therefore immaterial in the context of the transaction as a whole. Following the discussion, representatives of Qatalyst Partners presented an extensive summary of the financial details of the proposed transaction.

On April 9, 2024, the exclusivity period expired, and Matterport and CoStar Group had not yet finalized the terms of certain of the transaction agreements, including the Merger Agreement. In the meantime, the parties continued negotiations on the commercial agreement.

On April 16, 2024, Messrs. Wheeler and Boxer informed Mr. Pittman of CoStar Group’s proposal to announce the transaction before the commencement of trading on April 22 in order to provide Matterport and CoStar Group sufficient time to align on the commercial terms, hold their respective board meetings and prepare for sequenced communications. Between April 16 and April 20, 2024, Foley and Latham addressed all remaining diligence items and finalized the drafts of the Merger Agreement and other transactions documents.

On April 17, 2024, the management teams of Matterport and CoStar Group, together with its respective financial advisors, met to discuss the companies’ preliminary quarterly financial results. In addition, members of Matterport’s management team who had been aware of the transaction agreed to sign the Good Reason waiver on the condition that it be amended to extend the coverage of the Matterport executive severance plan for two years following consummation of the transaction. In addition, Messrs. Pittman and Dave Gausebeck, Chief Scientific Officer of Matterport, agreed to enter into a five-year restrictive covenant agreement.

On April 19, 2024, Messrs. Pittman and Florance discussed the communications plan in respect of the announcement of the transaction.

On April 20, 2024, at a special meeting of the Matterport Board, at which members of Matterport’s senior management team and representatives of Foley and Qatalyst Partners were present, Mr. Pittman provided the directors with an overview of the discussions with CoStar Group since the last board meeting and a status update on the proposed transaction, including all critical open items, how each had been addressed, and the finalization of all definitive agreements relating to the transaction. Mr. Pittman also presented a summary of the commercial agreement with CoStar Group and drafts of the communication materials. Thereafter, representatives of Foley described the proposed final terms of the Merger Agreement, the voting agreement, the “Good Reason” waiver and other transaction documents, copies of which were provided to the directors in advance of the meeting (in execution form), together with detailed summaries thereof. Representatives of Foley again highlighted the material terms in the Merger Agreement, non-solicitation provision, operating covenants of Matterport, the termination provisions and the closing conditions. Then, representatives of Foley again reviewed the fiduciary duties of the directors, including the specifics of such duties in connection with consideration of approving the proposed Merger Agreement and the transactions contemplated thereby. The Matterport Board reviewed the management projections, as prepared by Matterport’s management team for use in its analysis (the “Management Projections”) with representatives of Qatalyst Partners (see the section entitled “Matterport Unaudited Prospective Financial Information” for a further discussion of the Management Projections), and then reviewed the Qatalyst Partners financial analysis materials, copies of which were provided to the directors prior to the meeting. After reviewing the foregoing, representatives of Qatalyst Partners then delivered to the Matterport Board Qatalyst Partners’ oral opinion, subsequently confirmed in Qatalyst Partners’ written opinion dated April 21, 2024, to the effect that, as of such date, and based upon and subject to the factors and assumptions set forth in Qatalyst Partners’ written opinion, the merger consideration to be received pursuant to, and in accordance with, the terms of the Merger Agreement by the holders of the shares of Matterport Common Stock, was fair, from a financial point of view, to such Matterport holders, as more fully described in the section entitled “The Mergers—Opinion of Qatalyst Partners” beginning on page 52 and the full text of the written opinion of Qatalyst Partners which is attached as Annex B to this proxy statement/prospectus. The Matterport Board then conducted a final review of its findings regarding the proposed transaction with CoStar Group. Based on the

48

foregoing and other factors and considerations, the Matterport Board unanimously (i) determined that the terms of the Merger Agreement and other transaction documents and the transactions contemplated thereby, including the proposed merger and the proposed merger consideration, were advisable, fair to, and in the best interests of, Matterport and its stockholders, (ii) approved the execution and delivery of the Merger Agreement by Matterport, the performance by Matterport of its covenants and other obligations thereunder and the consummation of the merger and other transactions contemplated by the Merger Agreement and (iii) resolved to recommend that the stockholders of Matterport adopt the Merger Agreement.

On Sunday, April 21, 2024, Matterport and CoStar Group executed the Merger Agreement. On April 22, 2024, Matterport and CoStar Group announced the transaction.

Matterport’s Reasons for the Mergers; Recommendations of the Matterport Board

At a special meeting held on April 20, 2024, the Matterport Board determined by unanimous vote that the Merger Agreement and the transactions contemplated by the Merger Agreement, including the Mergers, are fair to, and in the best interests of Matterport and its stockholders; approved and declared advisable the Merger Agreement and the transactions contemplated thereby, including the Mergers; and resolved to recommend that Matterport stockholders approve the transactions contemplated by the Merger Agreement, including the Mergers, and adopt the Merger Agreement. The Matterport Board unanimously recommends that you vote “FOR” the Merger Proposal, “FOR” the Transaction Related Compensation Proposal, on an advisory, non-binding basis and “FOR” the Adjournment Proposal.

In evaluating the Merger Agreement, the Mergers and the other transactions contemplated by the Merger Agreement, the Matterport Board consulted with management, its financial advisor and outside legal counsel. In recommending the stockholder vote in favor of the adoption of the Merger Agreement, the Matterport Board considered a variety of factors, including without limitation the following principal factors (not in any relative order of importance):

49

50

The Matterport Board also considered a number of potentially negative factors in its deliberations concerning the Merger Agreement, the Mergers and the other transactions contemplated by the Merger Agreement, including the following (not in any relative order of importance):

51

In the judgment of the Matterport Board, however, the potential benefits of the Mergers discussed above outweighed these potential risks.

The foregoing discussion is not intended to be an exhaustive list of the information and considered by the Matterport Board in its consideration of the Mergers but includes the material positive factors and material negative factors considered by the Matterport Board in that regard. In view of the number and variety of factors, the amount of information considered and the complexity of these matters, Matterport Board did not find it useful and did not attempt to quantify, rank or assign any relative or specific weights to the various factors that it considered. Individual members of the Matterport Board may have given different weights to different factors. The Matterport Board considered all these factors as a whole, and overall considered the factors to be favorable to, and to support, its unanimous determination.

In considering the Matterport Board’s recommendation to adopt the Merger Agreement, Matterport’s stockholders should be aware that the executive officers and directors of Matterport have certain interests in the Mergers that may be different from, or in addition to, the interests of Matterport’s stockholders generally, as more fully described below under the section captioned section titled “The Mergers—Interests of Matterport Directors and Executive Officers in the Mergers.” The Matterport Board was aware of these interests and considered them when adopting the Merger Agreement and recommending that Matterport stockholders vote to adopt the Merger Agreement.

Opinion of Matterport’s Financial Advisor

Opinion of Qatalyst Partners

Matterport retained Qatalyst Partners to act as its financial advisor in connection with the Mergers and to evaluate whether the merger consideration to be received pursuant to, and in accordance with, the terms of the

52

Merger Agreement by the holders of shares of Matterport Common Stock (other than CoStar Group or any affiliate of CoStar Group) was fair, from a financial point of view, to such holders. Matterport selected Qatalyst Partners to act as Matterport’s financial advisor based on Qatalyst Partners’ qualifications, expertise, reputation and knowledge of the business and affairs of Matterport and the industry in which it operates. Qatalyst Partners has provided its written consent to the reproduction of its opinion in this proxy statement/prospectus. At the meeting of the Matterport Board on April 20, 2024, Qatalyst Partners rendered to the Matterport Board its oral opinion, which was confirmed by delivery of a written opinion dated April 21, 2024, to the effect that, as of such date and based upon and subject to the various assumptions, qualifications, limitations and other matters set forth therein, the merger consideration to be received pursuant to, and in accordance with, the terms of the Merger Agreement by the holders of shares of Matterport Common Stock (other than CoStar Group or any affiliate of CoStar Group) was fair, from a financial point of view, to such holders.

The full text of Qatalyst Partners’ written opinion, dated April 21, 2024, is attached hereto as Annex B. The opinion sets forth, among other things, the assumptions made, procedures followed, matters considered and limitations and qualifications of the review undertaken by Qatalyst Partners in rendering its opinion. Holders of shares of Matterport Common Stock should read the opinion carefully in its entirety. Qatalyst Partners’ opinion was provided to the Matterport Board and addresses only, as of the date of the opinion, the fairness, from a financial point of view, of the merger consideration to be received pursuant to, and in accordance with, the terms of the Merger Agreement by the holders of shares of Matterport Common Stock (other than CoStar Group or any affiliate of CoStar Group), to such holders, and it does not address any other aspect of the Mergers. It does not constitute a recommendation as to how any holder of shares of Matterport Common Stock should vote with respect to the Merger Proposal or any other matter and does not in any manner address the price at which Matterport Common Stock will trade or otherwise be transferable at any time. The summary of Qatalyst Partners’ opinion set forth herein is qualified in its entirety by reference to the full text of the opinion.

In arriving at its opinion, Qatalyst Partners reviewed the Merger Agreement, certain related documents and certain publicly available financial statements of Matterport and CoStar Group and other business and financial information of Matterport and CoStar Group. Qatalyst Partners also reviewed certain forward-looking information relating to Matterport prepared by the management of Matterport, including financial projections and operating data of Matterport described in the section below entitled “The Mergers—Matterport Unaudited Prospective Financial Information.” Additionally, Qatalyst Partners discussed the past and current operations and financial condition and the prospects of Matterport and CoStar Group with senior management of Matterport and CoStar Group, respectively. Qatalyst Partners also reviewed the historical market prices and trading activity for Matterport Common Stock and CoStar Group Common Stock and compared the financial performance of Matterport and CoStar Group and the prices and trading activity of Matterport Common Stock and CoStar Group Common Stock with that of certain other selected publicly traded companies and their securities. In addition, Qatalyst Partners reviewed the financial terms, to the extent publicly available, of selected acquisition transactions and performed such other analyses, reviewed such other information and considered such other factors as Qatalyst Partners deemed appropriate.

In arriving at its opinion, Qatalyst Partners assumed and relied upon, without independent verification, the accuracy and completeness of the information that was publicly available or supplied or otherwise made available to, or discussed with, Qatalyst Partners by Matterport and CoStar Group. With respect to the Management Projections, Qatalyst Partners was advised by the management of Matterport, and Qatalyst Partners assumed based on discussions with the management of Matterport and the Matterport Board, that the Management Projections had been reasonably prepared on bases reflecting the best currently available estimates and judgments of the management of Matterport of the future financial performance of Matterport and other matters covered thereby. Qatalyst Partners expressed no view as to the Management Projections or the assumptions on which they were based. Qatalyst Partners assumed that the Mergers will be consummated in accordance with the terms set forth in the Merger Agreement, without any modification, waiver or delay and with no adjustment to the merger consideration. In addition, Qatalyst Partners assumed that in connection with the

53

receipt of all the necessary approvals of the Mergers, no delays, limitations, conditions or restrictions will be imposed that could have an adverse effect on Matterport, CoStar Group or the contemplated benefits expected to be derived in the Mergers. Qatalyst Partners did not make any independent evaluation or appraisal of the assets or liabilities (contingent or otherwise) of Matterport or CoStar Group or their respective affiliates, nor was Qatalyst Partners furnished with any such evaluation or appraisal. In addition, Qatalyst Partners relied, without independent verification, upon the assessment of the management of Matterport as to the existing and future technology and products of Matterport and the risks associated with such technology and products. In arriving at its opinion, Qatalyst Partners was not authorized to solicit, and did not solicit, interest from any party with respect to an acquisition, business combination or other extraordinary transaction involving Matterport. Qatalyst Partners’ opinion has been approved by its opinion committee in accordance with its customary practice.

Qatalyst Partners’ opinion is necessarily based on financial, economic, market and other conditions as in effect on, and the information made available to it as of, the date of the opinion. Events occurring after the date of the opinion may affect Qatalyst Partners’ opinion and the assumptions used in preparing it, and Qatalyst Partners has not assumed any obligation to update, revise or reaffirm its opinion. Qatalyst Partners’ opinion does not address the underlying business decision of Matterport to engage in the Mergers, or the relative merits of the Mergers as compared to any strategic alternatives that may be available to Matterport. Qatalyst Partners’ opinion is limited to the fairness, from a financial point of view, of the merger consideration to be received pursuant to, and in accordance with, the terms of the Merger Agreement by the holders of shares of Matterport Common Stock (other than CoStar Group or any affiliate of CoStar Group), and Qatalyst Partners expressed no opinion with respect to the fairness of the amount or nature of the compensation to any of the officers, directors or employees of Matterport or CoStar Group or any of their respective affiliates, or any class of such persons, relative to such consideration.

The following is a brief summary of the material analyses performed by Qatalyst Partners in connection with its opinion dated April 21, 2024. The analyses and factors described below must be considered as a whole; considering any portion of such analyses or factors, without considering all analyses and factors, could create a misleading or incomplete view of the process underlying Qatalyst Partners’ opinion. For purposes of its analyses, Qatalyst Partners utilized, among other things, the Management Projections, described in the section below entitled “The Mergers—Matterport Unaudited Prospective Financial Information” and third-party research analyst consensus estimates as of April 19, 2024 (the “Street Estimates”). Some of the summaries of the financial analyses include information presented in tabular format. The tables are not intended to stand alone, and in order to more fully understand the financial analyses used by Qatalyst Partners, the tables must be read together with the full text of each summary. Considering the data set forth below without considering the full narrative description of the financial analyses, including the methodologies and assumptions underlying the analyses, could create a misleading or incomplete view of Qatalyst Partners’ financial analyses.

Discounted Cash Flow Analysis

Qatalyst Partners performed an illustrative discounted cash flow analysis, which is designed to imply a range of potential per-share present values for Matterport Common Stock as of December 31, 2023 (which, at the time of such analysis, was the end of Matterport’s most recent publicly reported fiscal quarter and most recent publicly reported balance sheet) with respect to the Management Projections by:

54

Based on the calculations set forth above, this analysis implied a range of values for Matterport Common Stock of approximately $4.13 to $8.01 per share.

Selected Companies Analysis

Qatalyst Partners reviewed and compared selected financial information and public market multiples for Matterport with publicly available financial information and public market multiples for selected companies. The companies used in this comparison were those companies listed below, which were selected by Qatalyst Partners in its professional judgment, based on factors including that they are publicly traded companies in similar lines of business to Matterport, have a similar business model, have similar financial performance or have other relevant or similar characteristics.

Based upon third-party research analyst consensus estimates as of April 19, 2024 and using the closing prices as of April 19, 2024 for shares of the selected companies, Qatalyst Partners calculated, among other things, the fully diluted enterprise value divided by (i) the estimated consensus revenue for calendar year 2024 (the “CY2024E revenue multiples”) and (ii) the estimated consensus revenue for calendar year 2025 (the “CY2025E revenue multiples”), for each of the selected companies, as shown below:

55

Based on an analysis of the CY2024E revenue multiples for the selected companies and the application of its professional judgment, Qatalyst Partners selected a representative multiple range of 1.5x to 6.0x. Qatalyst Partners then applied this range to the Matterport’s revenue estimates for calendar year 2024, based on each of the Management Projections and the Street Estimates.

Based on an analysis of the CY2025E revenue multiples for the selected companies and the application of its professional judgment, Qatalyst Partners selected a representative multiple range of 1.5x to 5.5x. Qatalyst Partners then applied this range to the Matterport’s revenue estimates for calendar year 2025, based on each of the Management Projections and the Street Estimates.

Based on the fully diluted shares of Matterport Common Stock outstanding as of April 17, 2024 (calculated utilizing the same methodology as used in the above discounted cash flow analysis), this analysis implied a range of values for Matterport Common Stock as follows:

No company included in the selected companies analysis is identical to Matterport. In evaluating the selected companies, Qatalyst Partners made judgments and assumptions with regard to industry performance, general business, economic, market and financial conditions and other matters. Many of these matters are beyond the control of Matterport, such as the impact of competition on Matterport’s business or the industry in general, industry growth and the absence of any material adverse change in Matterport’s financial condition and prospects or the industry or in the financial markets in general. Individual multiples or mathematical analysis, such as determining the arithmetic mean, median, or the high or low, is not in itself a meaningful method of using selected company data.

Selected Transactions Analysis

Qatalyst Partners compared 74 selected public company transactions, including transactions involving companies participating in similar lines of business to Matterport or with similar business models, similar financial performance or other relevant or similar characteristics.

56

For each of the selected transactions listed below, Qatalyst Partners reviewed, among other things, (a) the implied fully diluted enterprise value of the target company as a multiple of the actual revenue from the last completed twelve-months of such target company (the “LTM Revenue Multiples”) and (b) the implied fully diluted enterprise value of the target company as a multiple of third-party research analyst consensus estimates of the next-twelve-months’ revenue of such target company (the “NTM Revenue Multiples”).

57

58

Based on the analysis of the LTM Revenue Multiples for the selected transactions and its professional judgment, Qatalyst Partners selected a representative multiple range of 4.9x to 9.8x, then applied this range to Matterport’s last twelve-months’ revenue (calculated for the twelve-month period ending on December 31, 2023) based on Matterport financial statements filed with the SEC by Matterport on February 27, 2024. Based on the fully diluted shares of Matterport Common Stock outstanding as of April 17, 2024 (calculated utilizing the same methodology as used in the above discounted cash flow analysis), as provided by management of Matterport, this analysis implied a range of values for Matterport Common Stock of approximately $3.24 to $5.27 per share.

Based on the analysis of the NTM Revenue Multiples for the selected transactions and its professional judgment, Qatalyst Partners selected a representative multiple range of 4.6x to 8.4x, then applied this range to Matterport’s estimated next-twelve-months’ revenues (calculated for the twelve-month period ending on December 31, 2024) based on Street Estimates. Based on the fully diluted shares of Matterport Common Stock outstanding as of April 17, 2024 (calculated utilizing the same methodology as used in the above discounted cash flow analysis), as provided by management of Matterport, this analysis implied a range of values for Matterport Common Stock of approximately $3.31 to $5.10 per share.

No company or transaction utilized in the selected transactions analysis is identical to Matterport or the Mergers. In evaluating the selected transactions, Qatalyst Partners made judgments and assumptions with regard to industry performance, general business, economic, market and financial conditions and other matters, many of which are beyond Matterport’s control, such as the impact of competition on Matterport’s business or the industry generally, industry growth and the absence of any material adverse change in Matterport’s financial condition and prospects or the industry or in the financial markets in general, which could affect the public trading value of the companies and the aggregate value of the transactions to which they are being compared. Individual multiples or mathematical analysis, such as determining the arithmetic mean, median, or the high or low, is not in itself a meaningful method of using selected transactional data. Because of the unique circumstances of each of these transactions and the Mergers, Qatalyst Partners cautioned against placing undue reliance on this information.

Miscellaneous

In connection with the review of the Mergers by the Matterport Board, Qatalyst Partners performed a variety of financial and comparative analyses for purposes of rendering its opinion. The preparation of a financial opinion is a complex process and is not necessarily amenable to a partial analysis or summary description. In arriving at its opinion, Qatalyst Partners considered the results of all its analyses as a whole and did not attribute any particular weight to any analysis or factor it considered. Qatalyst Partners believes that selecting any portion of its analyses, without considering all analyses as a whole, could create a misleading or incomplete view of the process underlying its analyses and opinion. In addition, Qatalyst Partners may have given various analyses and factors more or less weight than other analyses and factors and may have deemed various assumptions more or less probable than other assumptions. As a result, the ranges of valuations resulting from any particular analysis described above should not be taken to be Qatalyst Partners’ view of the actual value of Matterport. In performing its analyses, Qatalyst Partners made numerous assumptions with respect to industry performance, general business, economic, market and financial conditions and other matters, many of which are beyond the control of Matterport. Any estimates contained in Qatalyst Partners’ analyses are not necessarily indicative of future results or actual values, which may be significantly more or less favorable than those suggested by such estimates.

59

Qatalyst Partners conducted the analyses described above solely as part of its analysis of the fairness, from a financial point of view, of the merger consideration to be received pursuant to, and in accordance with, the terms of the Merger Agreement by the holders of shares of Matterport Common Stock (other than CoStar Group or any affiliate of CoStar Group), to such holders. These analyses do not purport to be appraisals or to reflect the price at which Matterport Common Stock might actually trade or otherwise be transferable at any time.

Qatalyst Partners’ opinion and its presentation to the Matterport Board was one of many factors considered by the Matterport Board in deciding to approve the Merger Agreement. Consequently, the analyses as described above should not be viewed as determinative of the opinion of the Matterport Board with respect to the merger consideration to be received pursuant to, and in accordance with, the terms of the Merger Agreement by the holders of shares of Matterport Common Stock (other than CoStar Group or any affiliate of CoStar Group) or of whether the Matterport Board would have been willing to agree to different consideration. The merger consideration payable in the Mergers was determined through arm’s-length negotiations between Matterport and CoStar Group and was approved by the Matterport Board. Qatalyst Partners provided advice to Matterport during these negotiations. Qatalyst Partners did not, however, recommend any specific consideration to Matterport or that any specific consideration constituted the only appropriate consideration for the Mergers.

Qatalyst Partners provides investment banking and other services to a wide range of entities and individuals, domestically and offshore, from which conflicting interests or duties may arise. In the ordinary course of these activities, affiliates of Qatalyst Partners may at any time hold long or short positions and may trade or otherwise effect transactions in debt or equity securities or loans of Matterport, CoStar Group or certain of their respective affiliates. During the two-year period prior to the date of Qatalyst Partners’ opinion, no material relationship existed between Qatalyst Partners or any of its affiliates and Matterport or CoStar Group pursuant to which compensation was received by Qatalyst Partners or its affiliates. Qatalyst Partners and/or its affiliates may in the future provide investment banking and other financial services to Matterport or CoStar Group or their respective affiliates for which Qatalyst Partners would expect to receive compensation.

Under the terms of its engagement letter, Qatalyst Partners provided Matterport with financial advisory services in connection with the Mergers for which it will be paid an aggregate amount currently estimated at approximately $36 million, $250,000 of which was payable upon the execution of the engagement letter, $4 million of which was payable upon delivery of its opinion (regardless of the conclusion reached in the opinion), and the remaining portion of which will be paid upon, and subject to, the completion of the Mergers. Matterport has also agreed to reimburse Qatalyst Partners for its expenses incurred in performing its services. Matterport has also agreed to indemnify Qatalyst Partners and its affiliates, their respective members, directors, officers, partners, agents and employees and any person controlling Qatalyst Partners or any of its affiliates against certain liabilities, including liabilities under the federal securities laws, and certain expenses related to or arising out of Qatalyst Partners’ engagement.

Matterport Unaudited Prospective Financial Information

Matterport does not as a matter of course make public forecasts or projections as to future revenues, operating income or other results. However, Matterport’s management regularly prepares and reviews with the Matterport Board its strategic and operating plans. In connection with Matterport’s strategic planning and budgeting process, Matterport’s management reviewed with the Matterport Board the Management Projections, consisting of certain unaudited prospective financial information of Matterport for the fiscal years 2024 through 2033, as prepared and used as described below. Matterport prepared the Management Projections and provided them to Qatalyst Partners and instructed Qatalyst Partners to use the Management Projections in connection with Qatalyst Partners’ evaluations of the Mergers and rendering of the fairness opinion in connection with the Mergers (as described in more detail in the section entitled “The Mergers—Opinion of Qatalyst Partners”).

The Management Projections were provided on a confidential basis to CoStar Group’s management and financial advisors in the due diligence process. The inclusion of the Management Projections in this proxy statement/prospectus should not be regarded as an indication that any of CoStar Group, Matterport or any other recipient of this information considered, or now considers, it to be necessarily predictive of actual future results or

60

material information, and, in fact, Matterport views the Management Projections as non-material because of the inherent risks and uncertainties associated with such forecasts. The Projections included in this proxy statement/prospectus are presented solely to give Matterport stockholders access to the information that was provided to Matterport’s financial advisor and made available to CoStar Group and CoStar Group’s financial advisors. The Management Projections included in this document have been prepared by, and are the responsibility of, Matterport, Inc.’s management. PricewaterhouseCoopers LLP has not audited, reviewed, examined, compiled nor applied agreed-upon procedures with respect to the Management Projections and, accordingly, PricewaterhouseCoopers LLP does not express an opinion or any other form of assurance with respect thereto. The PricewaterhouseCoopers LLP report incorporated by reference in this document relates to Matterport, Inc.’s previously issued financial statements. It does not extend to the Management Projections and should not be read to do so.

The Management Projections were developed through Matterport’s customary strategic planning and budgeting process utilizing reasonable available estimates and judgments at the time of their preparation. The Management Projections were developed on a stand-alone basis without giving effect to the Mergers, and therefore the Management Projections do not give effect to the transaction or any changes to Matterport’s operations or strategy that may be implemented after the consummation of the Mergers, including potential synergies that may be realized as a result of the transaction, or to any costs incurred in connection with the transaction. Furthermore, the Management Projections do not take into account the effect of any failure of the transaction to be completed and should not be viewed as relevant or continuing in that context.

Matterport does not intend to update or otherwise revise the Management Projections to reflect circumstances existing since its preparation or to reflect the occurrence of unanticipated events or changes in general economic or industry conditions even in the event that any or all of the underlying assumptions may have changed.

The Management Projections are not included in this proxy statement/prospectus in order to induce any stockholder to vote in favor of the Merger Proposal or any of the other proposals to be voted on at the special meeting or to influence any stockholder to make any investment decision with respect to the Mergers or otherwise. For the reasons described above, readers of this proxy statement/prospectus are cautioned not to place undue, if any, reliance on the Management Projections. Matterport has not made any representation in the Merger Agreement concerning the Management Projections.

Subject to the following qualifications, the following is a summary of the Management Projections of Matterport:

The principal assumptions reflected in the Management Projections include:

61

Important Information About the Matterport Forecasts

The Management Projections were not prepared with a view toward public disclosure or toward complying with GAAP, nor were they prepared with a view toward compliance with the published guidelines of the SEC, or the guidelines established by the American Institute of Certified Public Accountants for preparation and presentation of projections of prospective financial information. The non-GAAP financial measures used in the Management Projections were approved by Matterport for the use by its financial advisor in connection with its opinion and were relied upon by the Matterport Board in connection with its consideration of the Mergers and the transaction consideration. The SEC rules, which would otherwise require a reconciliation of a non-GAAP financial measure to a GAAP financial measure, do not apply to non-GAAP financial measures provided to Qatalyst Partners or to the Matterport Board in connection with a proposed business combination like the Mergers if the disclosure is included in a document like this proxy statement/prospectus. In addition, reconciliations of non-GAAP financial measures to a GAAP financial measure were not relied upon by Qatalyst Partners for purposes of its opinion or by the Matterport Board in connection with its consideration of the Merger Agreement, the Mergers and the transaction consideration. Accordingly, Matterport has not provided a reconciliation of the financial measures included in the Management Projections to the relevant GAAP financial measures. In addition, the Management Projections were not prepared with a view towards complying with GAAP. The Management Projections may differ from published analyst estimates and forecasts and do not take into account any events or circumstances after the date they were prepared, including the announcement of the Mergers.

While the Management Projections are presented with numerical specificity, the Management Projections were based on numerous variables and assumptions that are inherently uncertain and may be beyond Matterport management’s control. Further, given that the Management Projections cover multiple years, by their nature, they become subject to greater uncertainty with each successive year beyond their preparation. Important factors that may affect actual results and may result in such projections not being achieved include: the occurrence of any event, change or other circumstances that could give rise to the termination of the Merger Agreement, the inability to complete the Mergers, or the failure to satisfy other conditions to completion of the Mergers, including that a governmental entity may prohibit, delay or refuse to grant approval for the completion of the Mergers, and risks and uncertainties pertaining to our business, including the risks and uncertainties detailed in our public periodic filings with the SEC. In addition, the ability to achieve the Management Projections may depend on, in part, whether or not the strategic goals, objectives and targets are reached over the applicable period. The assumptions upon which the Management Projections were based necessarily involve judgments with respect to, among other things, future economic, competitive and regulatory conditions and financial market conditions and future business decisions that may not be realized and that are inherently subject to significant business, economic, competitive and regulatory uncertainties and contingencies, including, among other things, the inherent uncertainty of the business and economic conditions affecting the industry in which Matterport operates, and the risks and uncertainties described in the section “Risk Factors” and Item IA of Matterport’s Annual Report on Form 10-K for the year ended December 31, 2023, all of which are difficult or impossible to predict accurately and many of which are beyond Matterport’s control. The Management Projections also reflect assumptions by Matterport management that are subject to change and are susceptible to multiple interpretations and periodic revisions based on actual results, revised prospects for the Matterport business, changes in general business or economic conditions, or any other transaction or event that has occurred or that may occur and that was not anticipated when such projections were prepared.

Interests of Matterport Directors and Executive Officers in the Mergers

In considering the recommendations of the Matterport Board with respect to the Mergers, Matterport stockholders should be aware that the directors and executive officers of Matterport have certain interests in the

62

Mergers, including financial interests, which may be different from or in addition to those of Matterport stockholders generally. The Matterport Board was aware of these interests and considered them, among other matters, in approving the Merger Agreement. Please see “The Mergers—Matterport’s Reasons for the Mergers; Recommendations of the Matterport Board.” These interests are summarized below. As used below, each reference to an executive officer of Matterport refers to an individual who has served as an executive officer of Matterport at any time since the beginning of Matterport’s previous fiscal year.

Executive Officers

For the purpose of this disclosure, Matterport’s current “named executive officers” (determined in accordance with SEC rules) are:

Matterport’s current executive officers include the named executive officers identified above as well as Peter Presunka, Chief Accounting Officer. The current non-employee directors include Mike (Gus) Gustafson, Jason Krikorian, Peter Hebert and Susan Repo.

Continuing Employment with Matterport

It is currently expected that the executive officers of Matterport will continue their employment with Matterport following the Closing on substantially comparable terms and conditions as in existence immediately prior to the First Effective Time, until successors are duly elected or appointed and qualified.

Mergers-Related Compensation for Matterport’s Named Executive Officers

Matterport’s named executive officers (a) are Matterport stockholders and will receive merger consideration in such capacities as a result of the Mergers, (b) are holders of Matterport Options and Matterport RSUs and will receive equivalent replacement awards with respect to CoStar Group Common Stock in such capacities as a result of the Mergers as described herein, (c) may receive cash and other severance benefits, in each case in connection with certain terminations of employment that could occur prior to or after Closing as described below, and (d) may receive new equity awards following the Mergers granted under CoStar Group’s equity incentive plans.

This section sets forth information required by Item 402(t) of Regulation S-K regarding the compensation for each of Matterport’s named executive officers that is based on or otherwise related to the Mergers and that will or may become payable to the named executive officer at the completion of the Mergers or on a qualifying termination of employment upon or following the consummation of the Mergers. This compensation is referred to as “golden parachute” compensation by the applicable SEC disclosure rules.

The following table assumes:

63

GOLDEN PARACHUTE COMPENSATION

Treatment of Matterport Equity Awards held by Executive Officers

At the First Effective Time, each Matterport Option (whether or not vested) that is outstanding immediately prior to the First Effective Time, other than each Matterport Option that is held by an individual who, as of immediately prior to the Closing, is no longer an employee or other service provider to Matterport or any Matterport subsidiary will automatically and without any required action on the part of CoStar Group, Matterport or the holder thereof, be converted into an option to acquire CoStar Group Common Stock with respect to that number of shares of CoStar Group Common Stock that is equal to the product of (i) the number of shares of Matterport Common Stock subject to such Matterport Option as of immediately prior to the First Effective Time, multiplied by (ii) the Equity Award Conversion Factor, rounded down to the nearest whole number of shares of CoStar Group Common Stock, at an exercise price per share of CoStar Group Common Stock equal to the quotient obtained by dividing (x) the per share exercise price of Matterport Option by (y) the Equity Award Conversion Factor, rounded up to the nearest whole cent, provided, however, that the exercise price and the

64

number of shares of CoStar Group Common Stock covered by such Matterport Option will be determined in a manner that is intended to be consistent with the requirements of Sections 424(a) and 409A of the Code.

At the First Effective Time, each Matterport RSU that is outstanding immediately prior to the First Effective Time, other than the Matterport RSUs that becomes fully vested as a result of the Closing, will automatically and without any required action on the part of CoStar Group, Matterport or the holder thereof, be converted into an award of restricted stock units covering a number of shares CoStar Group Common Stock that is equal to the product of (i) the number of shares of Matterport Common Stock subject to such Matterport RSU award as of immediately prior to the First Effective Time, multiplied by (ii) the Equity Award Conversion Factor, rounded down to the nearest whole number of shares of CoStar Group Common Stock.

These equity awards also may be subject to accelerated vesting in the event of the named executive officer’s termination of employment in certain circumstances, as described under “Severance Benefits” below.

The following table summarizes the outstanding Matterport Equity Awards held by Matterport’s executive officers as of May 14, 2024 and the estimated aggregate value of such Matterport Equity Awards, with such numbers and amounts calculated based on the average closing market price of Matterport Common Stock over the five business day period commencing on May 13, 2024.

The treatment of Matterport’s equity compensation awards in connection with the Mergers is further described in the section titled “The Merger Agreement—Treatment of Outstanding Matterport Equity Awards in the Mergers.”

Severance Benefits

All of Matterport’s named executive officers are participants in the Executive Severance Plan. The Executive Severance Plan superseded any existing change in control and severance benefits previously provided to the participants prior to the adoption of the Executive Severance Plan. In connection with the Mergers, certain Matterport executive officers entered into a Severance Plan Waiver Agreement, dated as of April 21, 2024 (the “Good Reason Waiver”), modifying the terms of their participation in the Executive Severance Plan.

The Executive Severance Plan, as modified by the Good Reason Waiver, provides for the payment of severance and other benefits to participants if a termination of employment with the Matterport without cause or for good reason (each as defined in the Executive Severance Plan and modified, as applicable, by the Good Reason Waiver) occurs during the period beginning three months prior to (and including) the date on which a change in control (as defined in the Executive Severance Plan) occurs and ending on (and including) the two-year anniversary of the consummation of the change in control (a “CIC Termination”). The Mergers will constitute a change in control for purposes of the Executive Severance Plan. If a CIC Termination occurs, then subject to the applicable participant’s execution of a general release of claims in favor of us, the following payments and benefits will be paid or provided to the participants:

65

If a Matterport executive officer experiences a CIC Termination during the three-month period preceding the consummation of the Mergers, then upon such termination the participant will receive a reduced amount of severance and benefits (as would normally be provided under the Severance Plan for non-CIC Terminations), and upon consummation of the Mergers, the remaining severance payments and benefits due would be provided or paid at such time.

280G Mitigation Actions

The Executive Severance Plan provides for a “best pay cap” approach, such that if the payment or benefit received by the executive officer would be subject to the excise tax provisions of Section 280G of the Code, then the payments under such plan would be reduced to an amount below the threshold at which such penalty tax provisions apply if such a reduction (and the avoidance of such penalty taxes) would be more favorable to the executive on an after-tax basis. While Matterport may be permitted to take certain actions to reduce the amount of any potential “excess parachute payments” for “disqualified individuals” (each as defined in Section 280G of the Code), no specific actions have yet been approved by the Matterport Board or compensation committee to mitigate the anticipated impact of Section 280G of the Code on Matterport and any disqualified individuals. Executive officers are not entitled to receive gross-ups or tax reimbursements from Matterport with respect to any potential excise taxes.

Mergers-Related Consideration for Matterport’s Non-Employee Directors

The non-employee directors of Matterport (a) are stockholders of Matterport and will receive merger consideration in such capacities as a result of the Mergers, and (b) are holders of Matterport RSUs, all of which are subject to accelerated vesting in the event of a change in control under the terms of the Matterport Non-Employee Director Compensation Program (the “Accelerated RSUs”), and will receive the benefit of the accelerated vesting of such Accelerated RSUs and merger consideration per share of Matterport Common Stock subject to each such Accelerated RSU in such capacities as a result of the Mergers.

The following table summarizes the outstanding Matterport Equity Awards held by Matterport’s non-employee directors as of May 14, 2024 and the estimated aggregate value of such Matterport Equity Awards, with such numbers and amounts calculated based on the average closing market price of Matterport Common Stock over the five business day period commencing on May 13, 2024.

66

In the event that the First Effective Time occurs on or after the date of the 2024 annual meeting of Matterport stockholders (the “2024 Annual Meeting”), each director who is serving on the Matterport Board as of the date of the 2024 Annual Meeting and who will continue to serve on the Matterport Board immediately following the 2024 Annual Meeting shall be automatically granted an equity award in the form of RSUs, as set forth in the Matterport Non-Employee Director Compensation Program. Any additional RSUs granted as of the 2024 Annual Meeting that remain unvested as of the First Effective Time will become vested in full upon a change in control, which includes the consummation of the Mergers.

Indemnification; Directors and Officers Insurance

Pursuant to the terms of the Merger Agreement, Matterport’s directors and executive officers will be entitled to certain ongoing indemnification and coverage under directors’ and officers’ liability insurance policies following the Mergers for matters based on or arise out of the fact that such person is or was a director or officer of Matterport or its subsidiaries at or prior to the First Effective Time. Such indemnification and insurance coverage is further described in the section titled “The Merger Agreement—Indemnification and Insurance.”

Accounting Treatment

The Mergers will be accounted for as a “business combination,” as that term is used under GAAP, for accounting and financial reporting purposes. Under acquisition accounting, the assets (including identifiable intangible assets) and liabilities (including executory contracts and other commitments) of Matterport as of the First Effective Time will be recorded at their respective fair values and added to those of CoStar Group. Any excess of purchase price over the fair values is recorded as goodwill. Costs related to the Mergers are expensed as incurred.

Regulatory Approvals

Completion of the Mergers is conditioned upon the receipt of certain governmental clearances or approvals as summarized below. The process for obtaining the requisite regulatory clearances or approvals for the Mergers is ongoing. Although CoStar Group and Matterport currently believe that they should be able to obtain all required regulatory clearances and approvals in a timely manner, the parties cannot be certain when or if they will obtain them or, if obtained, whether the clearances and approvals will contain terms, conditions or restrictions not currently contemplated that will be detrimental to the combined company after the completion of the Mergers.

Such regulatory clearances or approvals do not mean that the applicable regulatory authority has determined that the consideration to be received by holders of Matterport Common Stock and/or the Mergers are fair to CoStar Group stockholders or Matterport stockholders. Regulatory clearance or approval does not constitute an endorsement or recommendation of the Mergers by any regulatory authority.

U.S. Antitrust Filing

Under the HSR Act, certain transactions, including the Mergers, may not be completed unless certain waiting period requirements have expired or been terminated early. The HSR Act provides that each party must file its respective HSR notification with the FTC and the Antitrust Division of the DOJ. A transaction notifiable under the HSR Act may not be completed until the expiration of a 30-day waiting period following the parties’ filings of their respective HSR notifications or the early termination of that waiting period. In the event the parties receive a request for additional information and documentary material (a “Second Request”) from the FTC or the DOJ, the waiting period is suspended, and the transaction may not be completed until the expiration or termination of a 30-day waiting period following the parties’ substantial compliance with the Second Request.

The parties’ HSR notifications were filed with the FTC and the DOJ on May 3, 2024. Following discussions with the FTC, CoStar Group voluntarily withdrew its initial HSR Act notification and refiled a new HSR Act notification. The withdrawal and refiling are standard procedural steps that provide the FTC with additional time to complete its review of the proposed Mergers. The waiting period under the HSR Act is set to expire at 11:59 p.m., Eastern Time, on July 3, 2024.

67

At any time before or after the expiration or termination of any applicable waiting period or any extension thereof, under the HSR Act, or before or after the Mergers are completed, the DOJ or the FTC may take action under the antitrust laws in opposition to the Mergers, including seeking to enjoin completion of the Mergers, to rescind the Mergers or to conditionally permit completion of the Mergers subject to regulatory concessions or conditions. In addition, U.S. state attorneys general could take action under the antitrust laws as they deem necessary or desirable in the public interest, including, without limitation, seeking to enjoin the completion of the Mergers or only permitting completion subject to regulatory concessions or conditions. Private parties may also seek to take legal action under the antitrust laws under some circumstances.

Although neither CoStar Group nor Matterport believes that the Mergers will violate the antitrust laws, there can be no assurance that a challenge to the Mergers on antitrust grounds will not be made or, if such a challenge is made, that it would not be successful.

Foreign Antitrust and Other Regulatory Filings

Consummation of the Mergers is further subject to notification and approval under the U.K.’s National Security and Investment Act 2021 (“NSIA”).

CoStar Group submitted a filing under the NSIA on May 7, 2024 and CoStar Group also submitted a briefing paper to the UK Competition and Markets Authority on June 5, 2024.

SEC Effectiveness of Registration Statement

In connection with the shares to be issued in the Mergers, CoStar Group has filed a registration statement with the SEC under the Securities Act, of which this proxy statement/prospectus is a part. The completion of the Mergers is conditioned on the registration statement being declared effective by the SEC and the absence of any stop order suspending the effectiveness of the registration statement or proceedings for such purpose having been initiated or threatened in writing by the SEC.

Efforts to Obtain Regulatory Approvals

In the Merger Agreement, CoStar Group and Matterport have agreed to use their reasonable best efforts, subject to certain limitations, to consummate and make effective the transactions contemplated by the Merger Agreement, including obtaining all necessary actions or non-actions, consents and approvals from governmental authorities, making all necessary registrations and filings (including filings with governmental authorities), and taking all reasonable steps as may be necessary to obtain an approval from, or to avoid any action by, any governmental authority necessary in connection with the consummation of the transactions contemplated by the Merger Agreement, including the Mergers. If any action is brought challenging any of the transactions contemplated by the Merger Agreement as violative of any antitrust laws or foreign investment laws, CoStar Group and Matterport have agreed to use reasonable best efforts to contest and defend (including through appeal)

such action, in order to avoid the entry of, or seek to have vacated, reversed or terminated, any order (whether temporary, preliminary or permanent) that would restrain, enjoin, prohibit or delay the consummation of the transactions contemplated by the Merger Agreement.

Neither CoStar Group nor Matterport may knowingly take any action that is intended to materially delay, impede or prevent the consummation of the Mergers and the other transactions contemplated by the Merger Agreement without the other party’s prior written consent. Furthermore, CoStar Group and its affiliates are not required to, and, without the prior written consent of CoStar Group, Matterport, its subsidiaries and their respective affiliates will not: (i) sell, divest, license or otherwise dispose of any assets, or hold separate and agree to sell, divest, license or otherwise dispose of, any assets of Matterport, CoStar Group, Merger Subs or their respective affiliates, (ii) terminate, amend or assign existing relationships and contractual rights and obligations, (iii) require CoStar Group, Merger Subs, Matterport or any of their respective affiliates to grant any right or commercial or other accommodation to, or enter into any material commercial contractual or other commercial

68

relationship with, any third party, (iv) impose limitations with respect to how they own, retain, conduct or operate all or any portion of their respective businesses or assets, or (v) otherwise offer, propose, negotiate, agree to, commit to or effect any other remedy, condition or undertaking of any kind. CoStar Group has also agreed that, from the date of the Merger Agreement through the earlier of the Closing Date or the termination of the Merger Agreement, CoStar Group will not, and will cause its subsidiaries not to, directly or indirectly acquire or agree to acquire any business, enterprise, operation, activity or service that involves, researches, develops, manufactures, operates, markets, supplies, licenses, sells or provides, in each case, directly or indirectly, spatial data, 3D capture products, 3D cameras or camera accessories, 3D photography, drone imaging capture or virtual tours, including but not limited to related technology or data platforms, software subscriptions, data licensing, applications, services or product hardware.

No Assurances of Obtaining Approvals

There can be no assurances that any of the regulatory approvals described above will be obtained and, if obtained, there can be no assurance as to the timing of such approvals, the ability to obtain such approvals on satisfactory terms or the absence of any litigation challenging such approvals.

Timing

CoStar Group and Matterport each have a right to terminate the Merger Agreement if the Mergers are not consummated on or before the Termination Date, which Termination Date will be automatically extended for up to three periods of 90 days each if, at the time of each such extension, all closing conditions other than with respect to receipt of clearance and approvals under certain specified antitrust or foreign investment laws have been satisfied or waived; provided that the terminating party’s breach of its obligations under the Merger Agreement may not have been a principal cause of or have resulted in the failure of the First Effective Time to occur on or before the Termination Date. For more information, see “The Merger Agreement—Termination of the Merger Agreement.”

Exchange of Shares in the Mergers

Prior to the First Effective Time, upon the terms and subject to the conditions of the Merger Agreement, CoStar Group will appoint the exchange agent to handle the exchange of Matterport Certificates or book-entry securities formerly representing Matterport Common Stock for the merger consideration. After the First Merger is completed, upon the terms and subject to the conditions of the Merger Agreement, if a stockholder held Matterport Certificates immediately prior to the First Effective Time, the exchange agent will send them a letter of transmittal and instructions for exchanging their Matterport Certificates for the merger consideration. Upon surrender of the Matterport Certificates for cancellation along with the executed letter of transmittal and other required documents described in the instructions, a holder of one share of Matterport Common Stock will receive (i) $2.75 in cash, without interest, (ii) the number of shares of CoStar Group Common Stock determined by application of the Exchange Ratio, together with cash in lieu of any fractional shares of CoStar Group Common Stock.

Holders of shares of Matterport Common Stock in book-entry form immediately prior to the First Effective Time will not need to take any action to receive the merger consideration.

If you are a CoStar Group stockholder, you are not required to take any action with respect to your CoStar Group stock certificates. Such certificates will continue to represent shares of CoStar Group Common Stock after the Mergers.

Listing of CoStar Group Common Stock in the Mergers

It is a condition to the completion of the Mergers that the CoStar Group Common Stock issuable in the First Merger and such other CoStar Group Common Stock to be reserved for issuance in connection with the First Merger be approved for listing on the Nasdaq Global Select Market, subject to official notice of issuance.

69

CoStar Group will use its reasonable best efforts to cause the shares of CoStar Group Common Stock to be issued in connection with the First Merger to be approved for listing on the Nasdaq Global Select Market, subject to official notice of issuance.

De-Listing and Deregistration of Matterport Common Stock

If the First Merger is completed, Matterport Common Stock currently listed on the Nasdaq Global Market will be delisted from the Nasdaq Global Market and will be de-registered under the Exchange Act.

70

THE MERGER AGREEMENT

The following section summarizes material provisions of the Merger Agreement. This summary does not purport to be complete and may not contain all of the information about the Merger Agreement that is important to you. This summary is subject to, and qualified in its entirety by reference to, the Merger Agreement, which is attached as Annex A to this proxy statement/prospectus and is incorporated by reference into this proxy statement/prospectus. The rights and obligations of the parties are governed by the express terms and conditions of the Merger Agreement and not by this summary or any other information contained in this proxy statement/prospectus. You are urged to read the Merger Agreement carefully and in its entirety before making any decisions regarding the Merger Agreement and the Merger contemplated thereby.

The Merger Agreement and the following summary have been included to provide you with information regarding the terms and conditions of the Merger Agreement and the transactions contemplated thereby. They are not intended to provide any other factual information about CoStar Group, Merger Sub I, Merger Sub II or Matterport or any of their respective subsidiaries or affiliates. That information can be found elsewhere in this proxy statement/prospectus and in the other public documents that CoStar Group and Matterport file with the SEC. The provisions of the Merger Agreement and the description of such provisions in this proxy statement/prospectus should not be read alone but instead should be read in conjunction with the other information contained in the reports, statements and filings that each of CoStar Group and Matterport files with the SEC and the other information in this proxy statement/prospectus. See the section titled “Where You Can Find More Information.”

The representations, warranties and covenants contained in the Merger Agreement (and summarized below) were made only for purposes of that agreement and as of specific dates, were solely for the benefit of the parties to the Merger Agreement, may be subject to limitations agreed upon by the contracting parties, including being qualified by disclosures not reflected in the Merger Agreement, were made for the purpose of allocating contractual risk between the parties to the Merger Agreement instead of establishing matters as facts, and may be subject to standards of materiality applicable to the contracting parties that differ from those applicable to you and other investors and reports and documents filed with the SEC. You are not third party beneficiaries under the Merger Agreement, and you should not rely on the representations, warranties and covenants or any descriptions thereof as characterizations of the actual state of facts or condition of CoStar Group, Merger Sub I, Merger Sub II or Matterport or any of their respective subsidiaries or affiliates. Moreover, information concerning the subject matter of the representations and warranties may change after the date of the Merger Agreement, which subsequent information may or may not be fully reflected in CoStar Group’s or Matterport’s public disclosures.

Form of the Mergers

On the terms and subject to the conditions set forth in the Merger Agreement, at the First Effective Time, (i) Merger Sub I will merge with and into Matterport, with Matterport surviving the First Merger as a wholly owned subsidiary of CoStar Group and the Surviving Corporation, and (ii) in the event that the Threshold Percentage is at least 40%, immediately following the First Merger and as part of a single integrated transaction, the Surviving Corporation will merge with and into Merger Sub II, with Merger Sub II surviving the Second Merger as a wholly owned subsidiary of CoStar Group and the Surviving Company. As a result of the Mergers, Matterport will cease to be an independent, publicly traded company.

Closing; Effective Times of the Mergers

Unless the parties otherwise agree, upon the terms and subject to the conditions of the Merger Agreement, Closing will take place at 9:00 am (New York City time) on a date to be specified by Matterport and CoStar Group, but not later than the 3^rd business day after the satisfaction or, to the extent not prohibited by law, waiver of all of the conditions set forth in the Merger Agreement (other than those conditions that, by their terms, are to be satisfied at the Closing, but subject to the satisfaction or, to the extent not prohibited by law, waiver of such conditions). See the section titled “The Merger Agreement—Conditions to Completion of the Mergers.”

71

The First Merger will become effective at the First Effective Time, when the certificate of merger with respect to the First Merger (“First Certificate of Merger”) has been accepted for filing by the Secretary of State of the State of Delaware, or such later time as may be agreed to by CoStar Group, Merger Sub I and Matterport and set forth in the First Certificate of Merger. In the event that the Threshold Percentage is at least 40%, immediately following the First Effective Time, a certificate of merger with respect to the Second Merger (“Second Certificate of Merger”) will be filed with the Secretary of State of the State of Delaware. The Second Merger will become effective at the Second Effective time, when the Second Certificate of Merger has been accepted for filing by the Secretary of State of the State of Delaware, or such later time as may be agreed to by CoStar Group, Merger Sub II and the Surviving Corporation. If (and only if) the Threshold Percentage is less than 40%, CoStar Group will have the right, in its sole discretion, to abandon the Second Merger at any time prior to the Second Effective Time.

Merger Consideration

The Merger Agreement provides that at the First Effective Time, each share of Matterport Common Stock issued and outstanding immediately prior to the First Effective Time, other than (x) shares of Matterport Common Stock held by Matterport (including in treasury), CoStar Group or their respective subsidiaries and (y) shares of Matterport Common Stock that are held by stockholders who have perfected and not withdrawn a demand for appraisal rights pursuant to the DGCL will automatically be cancelled and converted into the right to receive (i) $2.75 in cash, without interest, and (ii) the number of shares of CoStar Group Common Stock equal to the Exchange Ratio, together with cash in lieu of any fractional shares of CoStar Group Common Stock.

The “Exchange Ratio” means:

In the event that the Threshold Percentage is at least 40%, for U.S. federal income tax purposes, the Mergers are intended to qualify as a reorganization under Section 368(a) of the Code. Whether the Mergers so qualify depends upon certain factors including the Average CoStar Group Share Price. If the Mergers so qualify, a holder of Matterport Common Stock will generally only recognize any taxable gain with respect to such stock up to the amount of cash received pursuant to the Mergers but will not recognize any taxable gain in excess of the amount of cash received.

Treatment of Outstanding Matterport Equity Awards in the Mergers

As described in more detail below, at the First Effective Time, certain Matterport Equity Awards will be cancelled, and others will be assumed by CoStar Group.

Any payments due or shares of CoStar Group Common Stock issuable pursuant to the cancellation of Matterport Equity Awards will be completed by CoStar Group promptly following the First Effective Time, and in any event within 10 business days, with cash payments being made through the Surviving Company’s or its affiliates’ regular payroll.

Any Matterport Equity Awards that are assumed by CoStar Group will continue to have, and will be subject to, the same terms and conditions, including vesting and acceleration of vesting terms and conditions, as those that applied to the corresponding Matterport Equity Award immediately prior to the First Effective Time, except that each reference to Matterport shall be deemed to be a reference to CoStar Group.

72

Matterport Options

Matterport Options Held by Continuing Employees and Other Service Providers. At the First Effective Time, each Matterport Option that is outstanding and unexercised and held by an individual who is then an employee or other service provider to Matterport will be assumed by CoStar Group and converted into a CoStar Group stock option award (A) with respect to a number of shares of CoStar Group Common Stock below (rounding down to the nearest whole share of CoStar Group Common Stock) equal to the product obtained by multiplying (x) the number of shares of Matterport Common Stock subject to such Matterport Option by (y) the Equity Award Conversion Factor and (B) with an exercise price per share of CoStar Group Common Stock (rounded up to the nearest cent) equal to the quotient obtained by dividing (x) the exercise price per share of Matterport Common Stock under such option by (y) the Equity Award Conversion Factor.

Matterport Options Held by Former Employees and Service Providers. Each Matterport Option that is outstanding and unexercised and held by an individual who is not an employee or other service provider to Matterport at the First Effective Time will be cancelled at the First Effective Time and converted into the right to receive a combination of shares of CoStar Group Common Stock and a cash payment, less withholding taxes, determined as follows:

“Equity Award Per Share Stock Consideration Value” means the Exchange Ratio multiplied by the CoStar Group Closing Share Price.

“Stock Consideration Percentage” means the quotient obtained by dividing the Equity Award Per Share Stock Consideration Value by the sum of (x) the Equity Award Per Share Stock Consideration Value and (y) $2.75.

“Cash Consideration Percentage” means the quotient obtained by dividing $2.75 by the sum of (i) the Equity Award Per Share Stock Consideration Value plus (ii) $2.75.

Any withholding taxes due as a result of the issuance of shares or payment of cash as described above shall first be satisfied from the cash portion of the option cancellation payment, and then if needed, by withholding a number of shares of CoStar Group Common Stock having a fair market value equal to the remaining withholding taxes due.

If the amount determined under the formulas above is zero, then the Matterport Option will be cancelled at the First Effective Time for no payment.

Matterport RSUs

At the First Effective Time, each outstanding Matterport RSU that provides for accelerated vesting as a result of the Merger shall become vested in full and cancelled and converted into the right to receive the merger consideration per share of Matterport Common Stock subject to such award.

73

At the First Effective Time, all other outstanding Matterport RSUs will be assumed by CoStar Group and converted into a CoStar Group restricted stock unit award with respect to a number of shares of CoStar Group Common Stock determined by multiplying the number of shares of Matterport Common Stock subject to the Matterport RSU by the Equity Award Conversion Factor (rounding down to the nearest whole share of CoStar Group Common Stock).

Matterport ESPP Awards

In accordance with the Merger Agreement, the Matterport Board has adopted resolutions providing that (i) the Offering Period in effect as of the date of the Merger Agreement will be the final Offering Period (such period, the “Final Offering Period”) and no further Offering Period will commence, and (ii) each individual participating in the Final Offering Period on the date of the Merger Agreement will not be permitted to (A) increase his or her payroll contribution rate pursuant to the Matterport ESPP from the rate in effect when the Final Offering Period commenced or (B) make separate non-payroll contributions to the Matterport ESPP on or following the date of the Merger Agreement. Prior to the First Effective Time, Matterport will take all actions that may be necessary to (x) cause the Final Offering Period, to the extent that it would otherwise be outstanding at the First Effective Time, to be terminated no later than 10 business days prior to the date on which the First Effective Time occurs; (y) after review and consent of CoStar Group, make any pro rata adjustments that may be necessary to reflect the Final Offering Period, but otherwise treat the Final Offering Period as a fully effective and completed Offering Period for all purposes pursuant to the Matterport ESPP; and (z) cause the exercise (as of no later than ten business days prior to the date on which the First Effective Time occurs) of each outstanding purchase right pursuant to the Matterport ESPP. On such exercise date, Matterport will apply the funds credited as of such date pursuant to the Matterport ESPP within each participant’s payroll withholding account to the purchase of whole shares of Matterport Common Stock in accordance with the terms of the Matterport ESPP, and such shares of Matterport Common Stock will be entitled to the merger consideration. As promptly as practicable following the purchase of shares of Matterport Common Stock in accordance with the preceding sentence, Matterport will return to each participant the funds, if any, that remain in such participant’s account after such purchase. Immediately prior to and effective as of the First Effective Time (but subject to the consummation of the First Merger), Matterport will terminate the Matterport ESPP.

Treatment of Outstanding Matterport Warrants in the Mergers

The Merger Agreement provides that, following the date of the Merger Agreement, Matterport shall use commercially reasonable efforts to cause the holders of each outstanding and unexercised private warrant exercisable for shares of Matterport Common Stock (each, a “Private Warrant”) to execute a conditional exchange agreement (the “Conditional Exchange Agreement”).

Pursuant to the Conditional Exchange Agreement, holders of each Private Warrant agree to exchange their Private Warrants for merger consideration upon Closing. The warrant price applicable to the Conditional Exchange Agreements would be calculated in accordance with the terms of the Private Warrant agreement. Such “Conditional Warrant Price” will equal the warrant price in effect as of the Closing, reduced by an amount (in dollars), calculated at the Closing, equal to the difference of (i) the warrant price in effect prior to the Closing minus (ii) (A) $2.75 minus (B) the Black-Scholes warrant value, each of which shall be calculated in accordance with the terms of the Private Warrants.

Once any holder of a Private Warrant executes a Conditional Exchange Agreement, it may not be revoked or amended by the parties; provided, however, that in the event that the Closing does not occur and the Merger Agreement is validly terminated in accordance with its terms, the terms of the Conditional Warrant Agreement will be null and void.

Dissenting Matterport Shares

The Merger Agreement provides that Dissenting Matterport Shares will not be converted into or represent the right to receive the merger consideration, but instead at the First Effective Time will be converted into such

74

consideration as may be determined to be due to the holders thereof in respect of such Dissenting Matterport Shares pursuant to Section 262 of the DGCL. If any holder of Dissenting Matterport Shares fails to perfect, withdraws or otherwise loses or forfeits the right to appraisal of the fair value of such Dissenting Matterport Shares under Section 262 of the DGCL, such Dissenting Matterport Shares will no longer be considered to be Dissenting Matterport Shares and will be deemed to have been converted into, and to have become exchangeable for, as of the First Effective Time, the right to receive, without interest, the merger consideration.

Charter and Bylaws

At the First Effective Time, by virtue of the First Merger, the certificate of incorporation and bylaws of the Surviving Corporation will be amended and restated in their entirety to be identical to the certificate of incorporation and bylaws of Merger Sub I, until thereafter amended in accordance with the applicable law. At the Second Effective Time, by virtue of the Second Merger, the certificate of formation and limited liability company agreement of the Surviving Company will be amended and restated in their entirety to be identical to the certificate of formation and limited liability company agreement of Merger Sub II, until thereafter amended in accordance with the applicable law (except that references to the name of Merger Sub II will be replaced by reference to the name of the Surviving Company).

Directors and Management

Under the Merger Agreement, the parties have agreed that, at the First Effective Time, the directors of Merger Sub I or such other individuals designated by CoStar Group will be the directors of the Surviving Corporation and the officers of Matterport or such other individuals designated by CoStar Group will be the officers of the Surviving Corporation until their respective successors are duly elected, designated and qualified, or until their earlier death, resignation or removal in accordance with the governing documents of the Surviving Corporation. At the Second Effective Time, the managing member of Merger Sub II will be the managing member of the Surviving Company and the officers of the Surviving Corporation or such other individuals designated by CoStar Group will be the officers of the Surviving Company, until their respective successors are duly elected, designated and qualified, or until their earlier death, resignation or removal in accordance with the governing documents of the Surviving Company.

Representations and Warranties of CoStar Group and Matterport

The Merger Agreement contains representations and warranties made by each of CoStar Group and Matterport to each other. These representations and warranties are subject to qualifications and limitations agreed to CoStar Group and Matterport in connection with negotiating the terms of the Merger Agreement. Some of the significant representations and warranties of both CoStar Group and Matterport contained in the Merger Agreement relate to, among other things:

75

The Merger Agreement also contains representations and warranties of Matterport regarding:

The Merger Agreement also contains representations and warranties of CoStar Group and Merger Subs regarding:

Definition of “Material Adverse Effect”

Many of the representations of CoStar Group and Matterport are qualified by a “material adverse effect” standard (that is, they will not be deemed to be untrue or incorrect unless their failure to be true or correct,

76

individually or in the aggregate, would have a material adverse effect). For purposes of the Merger Agreement, “material adverse effect” with respect to either CoStar Group or Matterport means any change, event, effect, fact, condition, development, occurrence, or circumstance, which individually or in the aggregate, has resulted in or would reasonably be expected to (i) prevent, materially impede or materially delay either party from consummating the Mergers or any of the other transactions contemplated by the Merger Agreement or (ii) result in a material adverse effect on the business, financial condition, assets, liabilities, or results of operations of either party and its subsidiaries, taken as a whole. However, the changes, events, effects, facts, conditions, developments, occurrences or circumstances relating to or resulting from the following will be excluded from the determination of material adverse effect:

Notwithstanding the exclusions described above, any changes, events, effects, facts, conditions, developments, occurrences or circumstances referred to in the first four bullets above will be taken into account in determining whether there has been a material adverse effect if, and only to the extent that such changes have a disproportionate effect on CoStar Group or Matterport and their subsidiaries relative to other participants in the industries in which CoStar Group or Matterport and their subsidiaries operate.

Conduct of Business Pending the Mergers

Restrictions on Matterport’s Interim Operations

Under the Merger Agreement, the parties have agreed that until the earlier of the First Effective Time or the termination of the Merger Agreement, subject to certain exceptions, unless (i) required by law, (ii) consented to in advance in writing by CoStar Group (which consent will not be unreasonably withheld, conditioned or delayed), (iii) expressly required or permitted by the Merger Agreement, or (iv) set forth in the Matterport’s disclosure letter (each of (i) through (iv), the “Matterport Interim Operating Exceptions”), Matterport will cause its subsidiaries to use reasonable best efforts to (A) conduct its business and the business of its subsidiaries in all material respects in the ordinary course of business consistent with past practice, (B) preserve substantially intact its current business organization and material assets, and (C) preserve in all material respects its present

77

relationships with key customers, suppliers, employees and other persons with which it has material business relations.

In addition, Matterport and its subsidiaries have agreed that, until the earlier of the First Effective Time or the termination of the Merger Agreement, subject to the Matterport Interim Operating Exceptions, they will not:

78

79

80

Restrictions on CoStar Group, Merger Sub I and Merger Sub II’s Interim Operations

Under the Merger Agreement, CoStar Group has agreed that until the earlier of the First Effective Time or the termination of the Merger Agreement unless (i) set forth in CoStar Group’s confidential disclosure letter, (ii) required by applicable law, or (iii) consented to in advance in writing by Matterport (which consent will not be unreasonably withheld, conditioned or delayed) (each of (i) through (iii), the “CoStar Group Interim Operating Exceptions”), CoStar Group, Merger Sub I and Merger Sub II will not:

Employee Matters

For the period commencing at the First Effective Time and ending on the first anniversary of the Closing Date (or, if earlier, the date of the applicable employee’s termination of employment) (the “Continuation Period”), CoStar Group will provide, or will cause to be provided, to each Matterport Continuing Employee, (i) annual base salary or hourly wage rate that is no less than what was provided to such Matterport Continuing Employee immediately prior to the First Effective Time, (ii) target annual cash incentive compensation opportunities that are no less than those in effect for each Matterport Continuing Employee immediately prior to the First Effective Time (excluding equity or equity-based incentive compensation opportunities and specific performance goals), (iii) employee benefits (including defined contribution retirement plan benefits, remote work arrangements and health and welfare benefits, but excluding equity or equity-based incentive compensation opportunities, change in control, retention or similar benefits, supplemental executive retirement arrangements, deferred compensation arrangements, retiree health and welfare benefits or defined benefit pension plans and specific performance goals for any cash incentive compensation) that are substantially comparable in the aggregate to those in effect for such Matterport Continuing Employee immediately prior to the First Effective Time and (iv) severance payments and benefits to each Matterport Continuing Employee who is terminated by CoStar Group other than for cause during the Continuation Period that are no less favorable than what the Matterport Continuing Employee would have been eligible to receive under a specified severance arrangement sponsored or maintained by Matterport or its subsidiaries.

For purposes of any benefit plans maintained by CoStar Group and its subsidiaries that will provide benefits to any Matterport Continuing Employees after the First Effective Time, CoStar Group will, or will cause its applicable subsidiary to, (i) use commercially reasonable efforts so that the Matterport Continuing Employees will be immediately eligible to participate, without any waiting time or satisfaction of any other eligibility requirements, in any and all CoStar Group benefit plans to the extent that (A) coverage under such CoStar Group benefit plan replaces coverage under a corresponding Matterport Benefit Plan in which such Matterport

81

Continuing Employee participated immediately before the First Effective Time and (B) such Matterport Continuing Employee has satisfied all waiting time and other eligibility requirements under the Matterport Benefit Plan being replaced by the CoStar Group benefit plan and (ii) for purposes of each CoStar Group benefit plan providing medical, dental, pharmaceutical and/or vision benefits to any Matterport Continuing Employee, CoStar Group will use reasonable best efforts to cause (A) all pre-existing condition exclusions and actively-at-work requirements of such CoStar Group benefit plan to be waived for such Matterport Continuing Employee and his or her covered dependents to the extent such conditions were inapplicable or waived under the comparable Matterport Benefit Plan and (B) any expenses incurred by any Matterport Continuing Employee and his or her covered dependents during the portion of the plan year of the Matterport Benefit Plan ending on the Closing Date begins to be taken into account under such CoStar Group benefit plan for the calendar year in which the Closing Date occurs for purposes of satisfying all deductible, coinsurance and maximum out-of-pocket requirements applicable to such Matterport Continuing Employee and his or her covered dependents for the applicable plan year as if such amounts had been paid in accordance with such CoStar Group benefit plan.

If requested by CoStar Group not less than five business days before the expected Closing Date, Matterport will terminate any Matterport Benefit Plans that are 401(k) plans, effective as of the day prior to the Closing Date. If any such Matterport Benefit Plan is terminated prior to the Closing, CoStar Group will cause the Matterport Continuing Employees who participated in such Matterport Benefit Plan as of the day prior to the Closing Date to be eligible to participate in a 401(k) plan of CoStar Group as of the Closing Date and will use take all steps reasonably necessary to cause such plan to accept eligible rollover distributions from the terminated Matterport Benefit Plan, including any associated plan loans, from such participants who are Matterport Continuing Employees and who elect a rollover.

Other Covenants and Agreements

The Merger Agreement contains certain other covenants and agreements, including covenants related to:

82

Conditions to Completion of the Mergers

The obligations of CoStar Group and Matterport to complete the Mergers are subject to certain conditions being satisfied or, where legally permissible, waived. These conditions include, among others: