Athanasios Tsiakmakis - 09 Jan 2026 SCHEDULE 13G/A 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: 7,968,127 shares
Disclosed Ownership: 400,000 shares
Ownership: 5%
Form type: SCHEDULE 13G/A
Filing time: 13 Jan 2026, 16:30:09 UTC
Date of event: 09 Jan 2026
Previous filing: 28 Oct 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Athanasios Tsiakmakis	5%	400,000	400,000	0	/s/ Athanasios Tsiakmakis	Athanasios Tsiakmakis