As filed with the Securities and Exchange Commission on September 26, 2025. Registration No. 333-289995 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 _____________________________________ NEPTUNE INSURANCE HOLDINGS INC. (Exact name of registrant as specified in its charter) _____________________________________ Delaware 6411 33-4189588 (State or other jurisdiction of incorporation or organization) ( ...

As filed with the Securities and Exchange Commission on September 22, 2025. Registration No. 333-289995 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 _____________________________________ NEPTUNE INSURANCE HOLDINGS INC. (Exact name of registrant as specified in its charter) _____________________________________ Delaware 6411 33-4189588 (State or other jurisdiction of incorporation or organization) ( ...

As filed with the Securities and Exchange Commission on September 2, 2025. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT Under The Securities Act of 1933 _____________________________________ NEPTUNE INSURANCE HOLDINGS INC. (Exact name of registrant as specified in its charter) _____________________________________ | Delaware | 6411 | 33-4189588 | | --- | --- | --- | | (State or other jurisdiction of | (Primary standard industri ...