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Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934 (Amendment No.      )


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Filed by a Party other than the Registrant      ¨


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¨ Preliminary Proxy Statement
¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
¨ Definitive Proxy Statement
x Definitive Additional Materials
¨  Soliciting Material under §240.14a-12



(Name of Registrant as Specified in Its Charter)



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Get informed before you vote *If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.ProxyVote.com or request a paper copy of the materials, which will contain the appropriate instructions. Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number Your Vote Counts! FLASHID-JOB# For complete information and to vote, visit www.ProxyVote.com Control # Ricky Campana P.O. Box 123456 Suite 500 51 Mercedes Way Edgewood, NY 11717 148,294 322,224 1 OF 2 30# Hextone, Inc. P.O. Box 9142 Farmingdale, NY 11735 XXXX XXXX XXXX XXXX RED ROBIN GOURMET BURGERS, INC. 2023 Annual Meeting Vote by May 17, 2023 11:59 PM ET You invested in RED ROBIN GOURMET BURGERS, INC. and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the shareholder meeting to be held on May 18, 2023. View the Notice & Proxy Statement, Form 10-K online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 04, 2023. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote in Person at the Meeting* May 18, 2023 8:00 AM MDT Red Robin Gourmet Burgers, Inc. Yummm U 10000 East Geddes Avenue Unit 500 Englewood, CO 80112


Voting Items Board Recommends THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Vote at www.ProxyVote.com FLASHID-JOB# Control # XXXX XXXX XXXX XXXX 1.00000 322,224 148,294 Under New York Stock Exchange rules, brokers may vote “routine” matters at their discretion if your voting instructions are not communicated to us at least 10 days before the meeting. We will nevertheless follow your instructions, even if the broker’s discretionary vote has already been given, provided your instructions are received prior to the meeting date. RED ROBIN GOURMET BURGERS, INC. 2023 Annual Meeting Vote by May 17, 2023 11:59 PM ET 1. Election of Directors Nominees: 1A Anthony S. Ackil For 1B Thomas G. Conforti For 1C Cambria W. Dunaway For 1D G.J. Hart For 1E Steven K. Lumpkin For 1F David A. Pace For 1G Allison Page For 1H Anddria Varnado For 2 Approval, on an advisory basis, of the compensation of the Company's named executive officers. For 3 Approval, on an advisory basis, of the frequency of holding an advisory vote on executive compensation. Year 4 Approval of the Amendment to the Amended and Restated Employee Stock Purchase Plan. For 5 Ratification of the appointment of Deloitte & Touche LLP as the Company's independent auditors for the fiscal year ending December 31, 2023. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof.