Common Stock, $0.01 par value

DENNY'S Corp

203 EAST MAIN STREET, SPARTANBURG, SC, 29319

This statement is filed by: (i) JCP Investment Partnership, LP, a Texas limited partnership ("JCP Partnership"); (ii) JCP Investment Partners, LP, a Texas limited partnership ("JCP Partners"), which serves as the general partner of JCP Partnership; (iii) JCP Investment Holdings, LLC, a Texas limited liability company ("JCP Holdings"), which serves as the general partner of JCP Partners; (iv) JCP Investment Management, LLC, a Texas limited liability company ("JCP Management"), which serves as the investment manager of JCP Partnership and certain managed accounts (the "JCP Accounts"); (v) James C. Pappas (together with JCP Partnership, JCP Partners, JCP Holdings and JCP Management, "JCP"), as the managing member of JCP Management and sole member of JCP Holdings; (vi) Jumana Capital Investments LLC, a Texas limited liability company ("Jumana Capital"); and (vii) Christopher R. Martin (together with Jumana Capital, "Jumana"), as the Manager of Jumana Capital. Each of the foregoing is referred to as a "Reporting Person" and collectively as the "Reporting Persons." Each of the Reporting Persons is party to that certain Group Agreement, as further described in Item 6. Accordingly, the Reporting Persons are hereby filing a joint Schedule 13D.

The principal business address of JCP is 1177 West Loop South, Suite 1320, Houston, Texas 77027. The principal business address of Jumana is 1717 St. James Place, Suite 335, Houston, Texas 77056.

The principal business of JCP Partnership is investing in securities. The principal business of JCP Partners is serving as the general partner of JCP Partnership. The principal business of JCP Holdings is serving as the general partner of JCP Partners. The principal business of JCP Management is serving as the investment manager of JCP Partnership and the JCP Accounts. The principal occupation of Mr. Pappas is serving as the managing member of JCP Management and sole member of JCP Holdings. The principal business of Jumana Capital is investing in securities. The principal occupation of Mr. Martin is serving as the Manager of Jumana Capital.

No Reporting Person has, during the last five years, been party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

JCP Partnership, JCP Partners, JCP Holdings, JCP Management and Jumana Capital are organized under the laws of the State of Texas. Messrs. Pappas and Martin are citizens of the United States of America.

The aggregate percentage of Shares reported owned by each person named herein is based upon 51,498,994 Shares outstanding as of July 30, 2025, which is the total number of Shares outstanding as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 4, 2025. As of the date hereof, JCP Partnership beneficially owned 455,717 Shares, constituting approximately 0.9% of the Shares outstanding. JCP Partners, as the general partner of JCP Partnership, may be deemed the beneficial owner of the 455,717 Shares owned by JCP Partnership, constituting approximately 0.9% of the Shares outstanding. JCP Holdings, as the general partner of JCP Partners, may be deemed the beneficial owner of the 455,717 Shares owned by JCP Partnership, constituting approximately 0.9% of the Shares outstanding. As of the date hereof, 373,774 Shares were held in the JCP Accounts, constituting approximately 0.7% of the Shares outstanding. JCP Management, as the investment manager of JCP Partnership and the JCP Accounts, may be deemed the beneficial owner of the (i) 455,717 Shares owned by JCP Partnership and (ii) 373,774 Shares held in the JCP Accounts, constituting approximately 1.6% of the Shares outstanding. Mr. Pappas, as the managing member of JCP Management and sole member of JCP Holdings, may be deemed the beneficial owner of the (i) 455,717 Shares owned by JCP Partnership and (ii) 373,774 Shares held in the JCP Accounts, constituting approximately 1.6% of the Shares outstanding. As of the date hereof, Jumana Capital beneficially owned 4,000,000 Shares, including 785,000 Shares underlying certain call options that are currently exercisable, constituting approximately 7.8% of the Shares outstanding. Mr. Martin, as the Manager of Jumana Capital, may be deemed the beneficial owner of the 4,000,000 Shares owned by Jumana Capital, constituting approximately 7.8% of the Shares outstanding. Each Reporting Person may be deemed to be a member of a "group" with the other Reporting Persons for the purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and such group may be deemed to beneficially own the 4,829,491 Shares owned in the aggregate by all of the Reporting Persons, constituting approximately 9.4% of the outstanding Shares. The filing of this Schedule 13D shall not be deemed an admission that the Reporting Persons are, for purposes of Section 13(d) of the Exchange Act, the beneficial owners of any securities of the Issuer he or it does not directly own. Each of the Reporting Persons specifically disclaims beneficial ownership of the securities reported herein that he or it does not directly own.

Each of JCP Partnership, JCP Partners, JCP Holdings, JCP Management and Mr. Pappas may be deemed to share the power to vote and dispose of the Shares owned by JCP Partnership. Each of JCP Management and Mr. Pappas may be deemed to share the power to vote and dispose of the Shares held in the JCP Accounts. Each of Jumana Capital and Mr. Martin may be deemed to share the power to vote and dispose of the Shares directly beneficially owned by Jumana Capital.

The transactions in the securities of the Issuer by the Reporting Persons during the past 60 days are set forth in Exhibit 1 and are incorporated herein by reference. All of such transactions were effected in the open market unless otherwise noted therein.

No person other than the Reporting Persons is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the Shares.

Not applicable.