Neptune Insurance Holdings Inc. (the “Company”) (NYSE: NP), the parent company of Neptune Flood Incorporated, today announced that, in connection with the secondary offering of 9,841,395 shares of its Class A common stock by certain selling securityholders, the underwriters have fully exercised their option to purchase an additional 1,476,209 shares of Class A common stock from the selling securityholders. The Company will not receive any proceeds from the sale of shares by the selling securityholders.

A registration statement relating to these securities was declared effective by the U.S. Securities and Exchange Commission on May 13, 2026.

Morgan Stanley is acting as lead left bookrunner for the offering. J.P. Morgan and Goldman Sachs & Co. LLC are acting as active bookrunners. BofA Securities, BMO Capital Markets, Deutsche Bank Securities, Evercore ISI, Keefe, Bruyette & Woods, a Stifel Company, Mizuho, Piper Sandler, Raymond James, TD Securities and Wells Fargo Securities are acting as joint bookrunners. Dowling & Partners Securities LLC and Capital One Securities are acting as co-managers.

The offering was made only by means of a final prospectus, dated May 13, 2026. Copies of the final prospectus may be obtained by visiting EDGAR on the SEC’s website at www.sec.gov. Alternatively, copies of the final prospectus may be obtained from Morgan Stanley & Co. LLC, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014; J.P. Morgan Securities LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, or by email at prospectus-eq_fi@jpmchase.com and postsalemanualrequests@broadridge.com; or Goldman Sachs & Co. LLC, Attention: Prospectus Department, 200 West Street, New York, New York 10282, telephone: 866-471-2526 or by emailing prospectus-ny@ny.email.gs.com.

This press release does not constitute an offer to sell or a solicitation of an offer to buy these securities, and there shall be no sale of these securities in any state or jurisdiction in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Neptune Insurance Holdings Inc.

Neptune Insurance Holdings Inc. (NYSE: NP) is the parent company of Neptune Flood Incorporated. Neptune Flood is a leading, AI-native managing general agent offering a range of easy-to-purchase residential and commercial insurance products, including primary and excess flood insurance, distributed through a nationwide network of agencies. Leveraging proprietary artificial intelligence and advanced data science, Neptune delivers fast and accessible coverage for residential and commercial properties across the United States. The Company operates without human underwriters, using Triton®, its cutting-edge platform, to streamline underwriting, pricing, and policy issuance.

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