SCHEDULE: L1 Capital Fund Discloses 9.99% Stake in C3is Inc.

L1 Capital Global Opportunities Master Fund, Ltd. has reported a 9.99% beneficial ownership stake in C3is Inc.'s common stock.

Summary

• L1 Capital Global Opportunities Master Fund, Ltd. reported beneficial ownership of 443,213 shares of C3is Inc. common stock.
• This ownership represents 9.99% of the class of securities.
• The beneficially owned amount includes 425,000 Common Shares and 18,213 Pre-Funded Warrants to purchase Common Shares.
• The reported percentage is based on 4,418,378 Common Shares outstanding after a previous offering, assuming no exercise of certain warrants.
• The filing was made on December 17, 2025, for an event that required filing on December 11, 2025.
• L1 Capital Global Opportunities Master Fund, Ltd. is a financial institution (FI) organized in the Cayman Islands.

Sentiment

Score: 5

Explanation: Neutral. This is a standard disclosure of a passive investment stake, providing factual information without inherent positive or negative sentiment regarding the issuer's performance or prospects.

Future Outlook

NA

Industry Context

This filing is a standard disclosure of a passive investment stake by an institutional investor and does not provide specific insights into broader industry trends or competitive landscape for C3is Inc.

Stakeholder Impact

• Shareholders: The disclosure indicates a significant institutional investor, L1 Capital Global Opportunities Master Fund, Ltd., has taken a 9.99% stake in C3is Inc., potentially signaling increased institutional interest.

Key Dates

Keywords

C3is Inc., L1 Capital Global Opportunities Master Fund, Common Stock, Schedule 13G, Beneficial Ownership, Warrants, SEC Filing