Athanasios Tsiakmakis - 16 Sep 2025 SCHEDULE 13G Report for C3is Inc. Common Stock, par value $0.01 per share (CISS)

Filing Manager: Athanasios Tsiakmakis
Reporting Manager: Athanasios Tsiakmakis
Security: C3is Inc. Common Stock, par value $0.01 per share
Symbol: CISS
Shares outstanding: 1,079,387 shares
Disclosed Ownership: 155,000 shares
Ownership: 14.4%
Form type: SCHEDULE 13G
Filing time: 28 Oct 2025, 17:00:51 UTC
Date of event: 16 Sep 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Athanasios Tsiakmakis	14.36%	155,000	155,000	0	/s/ Athanasios Tsiakmakis	Athanasios Tsiakmakis