Amendment No. 6 to Schedule 13D for C3is Inc. by Imperial Petroleum Inc.

Imperial Petroleum Inc. has filed Amendment No. 6 to Schedule 13D regarding its ownership of common stock in C3is Inc. The amendment updates the number of shares beneficially owned by Imperial Petroleum due to changes in the conversion price of the Series A Convertible Preferred Stock, adjusted to $2.50 following a registered offering by C3is Inc. on October 9, 2025. The amendment also reflects dilution in percentage ownership based on the revised total number of outstanding shares, considering the issuance of shares and exercise of warrants. Harry N. Vafias, Chairman, CEO, and President of Imperial Petroleum, is the Non-Executive Chairman of C3is Inc. and beneficially owns 100,577 shares of Common Stock. Imperial Petroleum may acquire, retain, or sell shares of C3is Inc. based on various factors, including the company's financial condition, market conditions, and strategic alternatives.