HMH(HMH) - Prospectus(update)

Registration No. 333-281497 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 11 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Table of Contents As filed with the Securities and Exchange Commission on March 23, 2026. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 3533 99-2746883 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification Numbe ...