Notice of Proposed Sale · 144

Red Robin Gourmet Burgers, Inc.

RRGBNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Jun 16, 2026Accepted Jun 16, 2026, 5:48 PM EDTFiling CIK 1171759Accession 0001950047-26-006239

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: RED ROBIN GOURMET BURGERS, INC.
Issuer CIK: 0001171759
SEC file number: 001-34851
Phone: (303) 846-6000
Person for whose account securities are to be sold: SARAH A MUSSETTER
Relationships to issuer: Officer
Street: 10000 E. Geddes Avenue, Suite 500
City: Englewood
State / country code: CO
Postal code: 80112

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Common	32,021	185,213.40	18,499,651	06/16/2026	NASDAQ	Morgan Stanley Smith Barney LLC Executive Financial Services

Broker / market maker — proposed row 1, entry 1

Name: Morgan Stanley Smith Barney LLC Executive Financial Services
Street: 1 New York Plaza
Street (continued): 8th Floor
City: New York
State / country code: NY
Postal code: 10004

Acquisition of securities to be sold

Acquisition of securities to be sold · 4 reported rows
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Common	06/30/2021	Employee Stock Purchase Plan	Issuer	60	N	06/30/2021	Not Applicable
Common	06/30/2020	Employee Stock Purchase Plan	Issuer	109	N	06/30/2020	Not Applicable
Common	02/17/2019	Restricted Stock	Issuer	28,691	N	02/17/2019	Not Applicable
Common	12/28/2025	Performance Shares	Issuer	3,161	N	12/28/2025	Not Applicable

Sales reported in the preceding three months

Sales reported in the preceding three months · 1 reported row
Seller	Security	Sale date	Amount sold	Gross proceeds
SARAH A MUSSETTER	Common	03/23/2026	2,927	9,424.94

Seller — prior-sale row 1, entry 1

Name: SARAH A MUSSETTER
Street: 10000 E. Geddes Avenue, Suite 500
City: Englewood
State / country code: CO
Postal code: 80112

Prior-sale reporting

Nothing to report for the preceding three months: N

Remarks

The securities to be sold were acquired upon the vesting of restricted stock during the period of 02/17/2019 through 12/08/2025.

Notice signature

Notice date: 06/16/2026
Signed: /s/ Sarah A. Mussetter

Company context

Red Robin Gourmet Burgers, Inc. (www.redrobin.com), is a casual dining restaurant chain founded in 1969 that operates through its wholly owned subsidiary, Red Robin International, Inc., and under the trade name, Red Robin Gourmet Burgers and Brews. We believe nothing brings people together like burgers and fun around our table, and no one makes moments of connection over craveable food more memorable than Red Robin. We serve a variety of burgers and mainstream favorites to Guests of all ages in a casual, playful atmosphere. In addition to our many burger offerings, Red Robin serves a wide array of salads, appetizers, entrees, desserts, signature beverages and Donatos Pizza at select locations. It's easy to enjoy Red Robin anywhere with online ordering available for to-go, delivery and catering. Sign up for the royal treatment by joining Red Robin Royalty® today and enjoy Bottomless perks and delicious rewards across nearly 500 Red Robin locations in the United States and Canada, including those operating under franchise agreements. Red Robin… YUMMM®!

Current securities

RRGBNASDAQ · EQUITY · Current

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