UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 As filed with the Securities and Exchange Commission on September 10, 2025 Registration No. 333-280565 AMENDMENT NO. 3 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Calisa Acquisition Corp (Exact name of registrant as specified in its charter) Cayman Islands 6770 N/A (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identificatio ...