Notice of Insider Transaction for HMH Holding Inc.

Lance Loeffler, a director at HMH Holding Inc., acquired 8,486 restricted stock units on April 2, 2026, under the company's 2026 Long-Term Incentive Plan. These units vest prior to the first annual stockholder meeting following the grant date. Additionally, Mr. Loeffler purchased 5,000 shares of Class A Common Stock for $20.00 per share through the company's directed share program during its initial public offering. Following these transactions, Mr. Loeffler directly owns 13,486 shares of Class A Common Stock.