HCM IV Acquisition(HACQU) - Prospectus(update)

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 ...