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 ...

Table of Contents As filed with the Securities and Exchange Commission on March 4, 2026. Registration No. 333-281497 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 9 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 HMH Holding Inc. (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 Ident ...

Core Insights - Andersen Group has gone public on the New York Stock Exchange, marking a significant milestone two decades after the criminal conviction of its predecessor, Arthur Andersen, was overturned [1][5] - The company priced its initial public offering (IPO) at $16 on December 16, and the stock is currently trading at approximately $25, resulting in a market value of $2.8 billion, which is about 3.5 times its revenue for the previous four quarters [4] Company Structure and Financials - Andersen Group operates under a complex corporate structure that prioritizes pre-IPO insiders over public shareholders, with insiders holding 89% of the company through a holding entity called Andersen Aggregator [3][6] - The firm has acknowledged weak internal accounting controls, which raises concerns about its operational integrity [3] - The business model primarily relies on hourly billing, which may face challenges from advancements in artificial intelligence [3] IPO Details and Tax Structure - The IPO raised approximately $188 million in net proceeds and utilized an Up-C structure, which is designed to provide tax benefits and cash flow primarily to existing insiders [7] - Insiders are set to receive 85% of the cash savings from tax deductions related to the exchange of partnership units for shares, with potential claims on future cash flows amounting to $486 million [8] - Concurrently with the IPO, AT Umbrella issued $350 million in promissory notes to insiders, representing an additional financial benefit to them [8]

Table of Contents As filed with the Securities and Exchange Commission on November 10, 2025. Registration No. 333-281497 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 7 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 HMH Holding Inc. (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 I ...

Table of Contents As filed with the Securities and Exchange Commission on August 19, 2025. Washington, D.C. 20549 Amendment No. 6 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 HMH Holding Inc. (Exact name of registrant as specified in its charter) Registration No. 333-281497 UNITED STATES SECURITIES AND EXCHANGE COMMISSION (I.R.S. Employer Identification Number) Houston, Texas 77032 (281) 449-2000 (Address, including zip code, and telephone number, including area code, of registrant's ...

Table of Contents As filed with the Securities and Exchange Commission on March 17, 2025. Registration No. 333-281497 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 4 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 HMH Holding Inc. (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 Iden ...