RED ROBIN GOURMET BURGERS INC

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Appendix A​

THIRD AMENDMENT TO

AMENDED AND RESTATED EMPLOYEE STOCK PURCHASE PLAN

The Amended and Restated Employee Stock Purchase Plan, as amended (the “Plan”) of Red Robin Gourmet Burgers, Inc., a Delaware corporation (the “Company”), is hereby amended, effective as of May 14, 2026 (the “Effective Date”), as follows:

1. Amendment to Section 4(a) of the Plan. The second sentence of Section 4(a) of the Plan is hereby amended and restated in its entirety as follows:

“The maximum number of Shares that may be delivered pursuant to Options granted under this Plan is 850,000 Shares, subject to adjustments pursuant to Section 17 (the “Plan Limit”).”

2. Effectiveness. In accordance with Section 19(b) of the Plan, the effectiveness of this Third Amendment to the Red Robin Gourmet Burgers, Inc. Amended and Restated Employee Stock Purchase Plan (this “Amendment”) is subject to the approval of the Company’s stockholders at the Company’s 2026 annual general meeting of stockholders. For the avoidance of doubt, if stockholder approval is not obtained, then this Amendment shall be voidab initio and of no force and effect.

3. Effect on the Plan. This Amendment shall not constitute a waiver, amendment or modification of any provision of the Plan not expressly referred to herein. Except as expressly amended or modified herein, the provisions of the Plan are and shall remain in full force and effect and are hereby ratified and confirmed. On and after the Effective Date, each reference in the Plan to “this Plan,” “herein,” “hereof,” “hereunder” or words of similar import shall mean and be a reference to the Plan as amended hereby. To the extent that a provision of this Amendment conflicts with or differs from a provision of the Plan, such provision of this Amendment shall prevail and govern for all purposes and in all respects.

IN WITNESS WHEREOF, the undersigned, being authorized by the Board of Directors of the Company (the “Board”) to execute this Amendment, as evidenced by the approval and adoption of this Amendment by the Board, has executed this Amendment as of the date first written above.

By:

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Name:

Title:

ANNUAL MEETING OF STOCKHOLDERS OF RED ROBIN GOURMET BURGERS, INC. May 14, 2026 If no direction is provided, this proxy will be voted "FOR" Proposal 6. NOTICE REGARDING INTERNET AVAILABILITY OF PROXY MATERIALS: The Notice of Meeting, Proxy Statement, Form of Proxy Card, and 2025 Annual Report on Form 10-K are available at www.redrobin.com/eproxy Please sign, date, and mail your proxy card in the envelope provided as soon as possible. Signature of Stockholder Date: Signature of Stockholder Date: 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. 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. THIS PROXY WHEN PROPERLY EXECUTED AND RETURNED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY THE UNDERSIGNED STOCKHOLDER. IF THIS PROXY IS PROPERLY EXECUTED AND RETURNED, BUT NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED “FOR” EACH DIRECTOR

LISTED UNDER PROPOSAL 1, AND “FOR” PROPOSALS 2, 3, AND 4. SHARES REPRESENTED BY THIS PROXY WILL BE VOTED AT THE MEETING IN ACCOR- DANCE WITH THE STOCKHOLDER’S SPECIFICATIONS. THIS PROXY CONFERS DISCRETIONARY AUTHORITY WITH RESPECT TO MATTERS NOT KNOWN OR DETERMINED AT THE TIME OF THE MAILING OF THE NOTICE OF THE ANNUAL MEETING OF STOCKHOLDERS TO THE UNDERSIGNED. THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF RED ROBIN GOURMET BURGERS, INC. PLEASE SIGN AND RETURN THIS PROXY IN THE ENCLOSED PRE-ADDRESSED ENVELOPE. THE GIVING OF A PROXY WILL NOT AFFECT YOUR RIGHT TO VOTE IN PERSON IF YOU ATTEND THE MEETING. The undersigned hereby acknowledges receipt of the notice of annual meeting of stockholders, proxy statement, and 2025 annual report on Form 10-K. 1. The election of seven (7) directors for one-year terms: (a) Anthony Ackil (b) Steven Lumpkin (c) Christopher Martin (d) David Pace (e) James Pappas (f) Nicole Miller Regan (g) Anddria Varnado 2. Approval, on an advisory basis, of the compensation of the Company’s named executive officers. 3. Approval of an amendment to the Company’s Amended and Restated Employee Stock Purchase Plan to increase the number of authorized shares available for issuance. 4. Ratification of the appointment of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 27, 2026. NOTE: Such other business as may properly come before the meeting or any adjournment thereof. FOR AGAINST ABSTAIN THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” ALL DIRECTORS LISTED UNDER PROPOSAL 1, AND “FOR” PROPOSALS 2, 3, AND 4. PLEASE SIGN, DATE, AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE x Please detach along perforated line and mail in the envelope provided. 00033333333030300000 8 051426 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 equiniti.com/us/ast-access to enjoy online access.

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014475 RED ROBIN GOURMET BURGERS, INC. THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS The undersigned hereby appoints David Pace and Sarah Mussetter, and each of them, as proxies, each with full power of substitution, to represent and vote as designated on the reverse side, all the shares of Common Stock of Red Robin Gourmet Burgers, Inc. held of record by the undersigned on March 17, 2026, at the Annual Meeting of Stockholders to be held at Red Robin’s Yummm U, located at 10000 East Geddes Avenue, Unit 500, Englewood, Colorado 80112, at 8:00 a.m. Mountain Time on May 14, 2026, or any adjournment or postponement thereof. This proxy authorizes each of the persons named above to vote at her or his discretion on any other matter that may properly come before the meeting or any postponement or adjournment thereof. If this card is properly executed and returned, but contains no specific voting instructions, these shares will be voted in accordance with the recommendation of the Board of Directors. (Continued and to be signed on the reverse side)