Insider shares and warrants of C3is Inc. unlock on Nov. 9, 2025, after a 30-day lock-up.

Shares and warrants of C3is Inc. held by insiders and major shareholders are subject to a 30-day lock-up ending November 9, 2025, beginning October 9, 2025. The restriction applies to executive officers, directors, employees, and those owning at least 10% of common shares or convertible securities, prohibiting sales, transfers, pledges, short selling, or derivative transactions without prior consent from the placement agent. The rule covers both existing and future holdings and aims to stabilize the stock market following the company’s offering, with limited exceptions.