As filed with the Securities and Exchange Commission on January 20, 2026 Registration No. 333-291343 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _________________________ AMENDMENT NO. 2 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 _________________________ HCM IV Acquisition Corp. (Exact name of registrant as specified in its charter) _________________________ Cayman Islands 6770 98-1883478 (State or other jurisdiction of incorporation or organization) (Pr ...

As filed with the Securities and Exchange Commission on November 24, 2025 Registration No. 333-291343 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _________________________ AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 _________________________ HCM IV Acquisition Corp. (Exact name of registrant as specified in its charter) _________________________ Cayman Islands 6770 98-1883478 (State or other jurisdiction of incorporation or organization) (P ...

As filed with the Securities and Exchange Commission on November 6, 2025 Registration No. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _________________________ FORM S-1 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 _________________________ HCM IV Acquisition Corp. (Exact name of registrant as specified in its charter) _________________________ | Cayman Islands | 6770 | 98-1883478 | | --- | --- | --- | | (State or other jurisdiction of | (Primary Standard Industrial | (I.R.S. ...