X0609 4 2026-04-02 0002021880 HMH Holding Inc HMH 0001240953 CHAUVIERE E CHARLS false 3300 NORTH SAM HOUSTON PARKWAY EAST HOUSTON TX 77032 false true false false Chief Operations Officer false Class A Common Stock 2026-04-02 4 A false 85478 0 A 85478 D Represents restricted stock units granted to the reporting person under the HMH Holding Inc. 2026 Long-Term Incentive Plan on April 2, 2026. Each restricted stock unit represents a contingent right to receive one share of Class A common stock, par value $0.01 per share, of HMH Holding Inc. The restricted stock units include 71,897 restricted stock units that vested immediately upon grant, 3,018 restricted stock units that vest on September 1, 2026, 4,225 restricted stock units that vest in two equal annual installments on September 1, 2026 and September 1, 2027 and 6,338 restricted stock units that vest in three equal annual installments on September 1, 2026, September 1, 2027 and September 1, 2028. /s/ Dwight W. Rettig, attorney-in-fact 2026-04-06