Neptune Insurance Holdings Inc. (Ticker: NP US) is a United States-based holding company specializing in residential and commercial flood insurance. Founded in 2018, Neptune operates nationwide, offering primary and excess coverage through its digital platform and partnerships with AM Best–rated carriers. The company also expanded its portfolio with the 2021 acquisition of Jumpstart, a parametric earthquake insurer, and strengthened its data science and AI capabilities through the 2024 acquisition of Charles River Data. Neptune plans to list its Class A shares on the NYSE on September 30, 2025, offering 18,421,053 shares at $18.00–$20.00 each, raising approximately $350 million. The IPO consists of 100% secondary shares, with a 15% greenshoe option available. Proceeds will go to selling shareholders. Morgan Stanley is acting as lead bookrunner and stabilization agent, alongside J.P. Morgan and Bank of America. The company is headquartered in St. Petersburg, Florida.