Imperial Petroleum Inc./Marshall Islands - 12 Dec 2025 SCHEDULE 13D/A Report for C3is Inc. Common Stock, par value $0.01 per share (CISS)

Filing Manager: Imperial Petroleum Inc./Marshall Islands
Reporting Manager: Imperial Petroleum Inc.
Security: C3is Inc. Common Stock, par value $0.01 per share
Symbol: CISS
Shares outstanding: 20,458,265 shares
Disclosed Ownership: 12,500,000 shares
Ownership: 61%
Form type: SCHEDULE 13D/A
Filing time: 15 Dec 2025, 06:05:17 UTC
Date of event: 12 Dec 2025
Previous filing: 10 Oct 2025
Next filing: 30 Dec 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Imperial Petroleum Inc.	61%	12,500,000	12,500,000	0	Harry N. Vafias	Chief Executive Officer	0001876581