C3is Executes 1-for-5 Reverse Stock Split

• C3is effected a 1-for-5 reverse stock split at 11:59 p.m. Eastern time on November 8, 2026.
• Outstanding common shares fell from approximately 4,200,000 to 840,000.
• Split-adjusted Nasdaq Capital Market trading began November 9, 2026, under CISS; fractional shares were settled in cash.
• Outstanding warrants and Series A Convertible Preferred Stock receive proportional adjustments, increasing exercise prices and reducing shares issuable upon exercise.
• Certain warrant exercise prices reset to the lowest daily VWAP over five trading days before and following effectiveness, if lower.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. C3is Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001193125-26-452731), on November 09, 2026, and is solely responsible for the information contained therein.