SCHEDULE 13D

DENNYS CORP

Common Stock, $0.01 par value · CUSIP: 24869P104

Event date: 2025-09-08

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: 455,717.00 · Class: 0.9%

• JCP Investment Partners, LPReported CIK 0001461947

  Shares: 455,717.00 · Class: 0.9%

• JCP Investment Holdings, LLCReported CIK 0001461948

  Shares: 455,717.00 · Class: 0.9%

• JCP Investment Management, LLCReported CIK 0001461945

  Shares: 829,491.00 · Class: 1.6%

• Pappas James CReported CIK 0001462171

  Shares: 829,491.00 · Class: 1.6%

• Jumana Capital Investments LLCReported CIK 0002036142

  Shares: 4,000,000.00 · Class: 7.8%

• Martin Christopher RossReported CIK 0002041913

  Shares: 4,000,000.00 · Class: 7.8%

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