Tivic Health Systems, Inc. (Exact name of registrant as specified in its charter) (State or Other Jurisdiction of Incorporation) Delaware 3845 81-4016391 (Primary Standard Industrial Classification Code Number) As filed with the Securities and Exchange Commission on July 25, 2025. Registration No. 333-287853 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 (I.R.S. Employer Identification No.) 47685 Lak ...