PROXY VOTING INSTRUCTIONS

INTERNET - Access www.voteproxy.com and follow the on-screen instructions or scan the QR code with your smartphone. Have your proxy card available when you access the web page.

TELEPHONE - Call toll-free 1-800-PROXIES (1-800-776-9437) in the United States or 1-201-299-4446 from foreign countries from any touch-tone telephone and follow the instructions. Have your proxy card available when you call.

Vote online/phone until 11:59 PM PDT the day before the meeting.

MAIL - Sign, date and mail your proxy card in the envelope provided as soon as possible.

VIRTUALLY AT THE MEETING - The company will be hosting the meeting live via the Internet. To attend the meeting via the Internet, please visit https://web.lumiconnect.com/216187135 (password: matterport2024) and be sure to have your control number available.

GO GREEN - e-Consent makes it easy to go paperless. With e-Consent, you can quickly access your proxy material, statements and other eligible documents online, while reducing costs, clutter and paper waste. Enroll today via https://equiniti.com/us/ast-access to enjoy online access.

COMPANY NUMBER

ACCOUNT NUMBER

00030000300300001000 4

072624

THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” PROPOSALS 1, 2 AND 3.

PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE ☒

For

Against

Abstain

1.  To adopt the Agreement and Plan of Merger and Reorganization, dated as of April 21, 2024, as it may be amended from time to time (the “Merger Agreement”), by and among CoStar Group, Inc., a Delaware corporation (“CoStar”), Matrix Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of CoStar (“Merger Sub I”), Matrix Merger Sub II LLC, a Delaware limited liability company and a wholly owned subsidiary of CoStar (“Merger Sub II”), and Matterport, a copy of which is attached as Annex A to the proxy statement/prospectus of which this notice is a part, and which is further described in the sections titled “The Mergers” and “The Merger Agreement”, beginning on pages 40 and 71, respectively (the “Merger Proposal”).

For

Against

Abstain

2.  To approve, on a non-binding, advisory basis, the compensation that may be paid or become payable to Matterport’s named executive officers that is based on or otherwise relates to the transactions contemplated by the Merger Agreement (the “Transaction Related Compensation Proposal”).

For

Against

Abstain

3.  To approve one or more adjournments of the Special Meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes to approve the Merger Proposal at the time of the Special Meeting (the “Adjournment Proposal”).

In their discretion, the proxies are authorized to vote upon such other business as may properly come before the Special Meeting, or any adjournment or postponement thereof. This proxy when properly executed will be voted as directed herein by the undersigned stockholder. If no direction is made, this proxy card will be voted FOR Proposals 1, 2 and 3.

MARK “X” HERE IF YOU PLAN TO ATTEND THE MEETING. ☐

To change the address on your account, please check the box at right and indicate your new address in the address space above. Please note that changes to the registered name(s) on the account may not be submitted via this method.

Signature of Stockholder

Signature of Stockholder 

Note:  Please sign exactly as your name or names appear on this Proxy. When shares are held jointly, each holder should sign. When signing as executor, administrator, attorney, trustee or guardian, please give full title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person.

00030000300300001000 4

     072624

THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” PROPOSALS 1, 2 AND 3.

PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE ☒

FOR

AGAINST

ABSTAIN

1.  To adopt the Agreement and Plan of Merger and Reorganization, dated as of April 21, 2024, as it may be amended from time to time (the “Merger Agreement”), by and among CoStar Group, Inc., a Delaware corporation (“CoStar”), Matrix Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of CoStar (“Merger Sub I”), Matrix Merger Sub II LLC, a Delaware limited liability company and a wholly owned subsidiary of CoStar (“Merger Sub II”), and Matterport, a copy of which is attached as Annex A to the proxy statement/prospectus of which this notice is a part, and which is further described in the sections titled “The Mergers” and “The Merger Agreement”, beginning on pages 40 and 71, respectively (the “Merger Proposal”).

FOR

AGAINST

ABSTAIN

2.  To approve, on a non-binding, advisory basis, the compensation that may be paid or become payable to Matterport’s named executive officers that is based on or otherwise relates to the transactions contemplated by the Merger Agreement (the “Transaction Related Compensation Proposal”).

FOR

AGAINST

ABSTAIN

3.  To approve one or more adjournments of the Special Meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes to approve the Merger Proposal at the time of the Special Meeting (the “Adjournment Proposal”).

In their discretion, the proxies are authorized to vote upon such other business as may properly come before the Special Meeting, or any adjournment or postponement thereof. This proxy when properly executed will be voted as directed herein by the undersigned stockholder. If no direction is made, this proxy card will be voted FOR Proposals 1, 2 and 3.

  MARK “X” HERE IF YOU PLAN TO ATTEND THE MEETING. ☐

To change the address on your account, please check the box at right and indicate your new address in the address space above. Please note that changes to the registered name(s) on the account may not be submitted via this method.

Signature of Stockholder 

Note:  Please sign exactly as your name or names appear on this Proxy. When shares are held jointly, each holder should sign. When signing as executor, administrator, attorney, trustee or guardian, please give full title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person.