X0609 4 2026-09-01 0 0002021880 HMH Holding Inc HMH 0001228420 RETTIG DWIGHT W false 3300 NORTH SAM HOUSTON PARKWAY EAST HOUSTON TX 77032 0 1 0 0 Chf Admn Officer, GC, Corp Sec 0 Class A Common Stock 2026-09-01 4 F 0 3442 19.26 D 98368 D Represents shares of Class A common stock, par value $0.01 per share of the Issuer withheld to satisfy tax withholding obligations upon the vesting of restricted stock units. This net settlement was approved by the board of directors of the Issuer pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended. /s/ Dwight W. Rettig 2026-09-03