SCHEDULE 13D/A

RED ROBIN GOURMET BURGERS INC

Common Stock, $0.001 par value · CUSIP: 75689M101

Event date: 2026-10-23

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• JCP Investment Partnership, LPReported CIK 0001461946

  Shares: 776,564.00 · Class: 4.1%

• JCP Investment Partners, LPReported CIK 0001461947

  Shares: 776,564.00 · Class: 4.1%

• JCP Investment Holdings, LLCReported CIK 0001461948

  Shares: 776,564.00 · Class: 4.1%

• JCP Investment Management, LLCReported CIK 0001461945

  Shares: 1,860,668.00 · Class: 9.8%

• Pappas James CReported CIK 0001462171

  Shares: 1,944,276.00 · Class: 10.3%

• Jumana Capital Investments LLCReported CIK 0002036142

  Shares: 1,667,906.00 · Class: 8.8%

• Martin Christopher RossReported CIK 0002041913

  Shares: 1,751,514.00 · Class: 9.3%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.