Form 4 Filing by Dwight W. Rettig

Dwight W. Rettig, Chief Administrative Officer, General Counsel, and Corporate Secretary of HMH Holding Inc., reported a transaction on September 3, 2026. Initially, 10,927 performance-based restricted stock units were granted on April 2, 2026. These units were contingent on the company's EBITDA growth compared to peers over a three-year period ending August 31, 2026, and Rettig's continued service. The Compensation Committee certified that the performance condition was met at 50%, resulting in the earned units being 100% of the target amount. Consequently, 10,927 shares of Class A Common Stock were acquired. Additionally, 4,300 shares were withheld to cover tax obligations upon the vesting of these units. Following these transactions, Rettig owns 104,995 shares of Class A Common Stock.