Power of Attorney for HMH Holding Inc. Director

This filing pertains to a Power of Attorney granted by Svein Oskar Stoknes, a director of HMH Holding Inc., to Thomas W. McGee, Dwight W. Rettig, and Cindy Nichols. The attorneys-in-fact are authorized to prepare and execute necessary documents, including Forms 3, 4, and 5, for electronic filing with the SEC, as required by Section 16 of the Securities Exchange Act of 1934. This authorization covers obtaining EDGAR codes, reporting ownership changes, and other actions beneficial to the grantor. The Power of Attorney remains effective until Stoknes is no longer required to file, revokes it in writing, or the attorneys-in-fact are no longer associated with the company. The document was signed on February 9, 2026, and notarized on the same date.