Alta Partners LLC - 27 Feb 2026 SCHEDULE 13G Report for C3is Inc. Common Stock, par value $0.01 per share (CISS)

Filing Manager: Alta Partners LLC
Reporting Manager: Alta Partners LLC
Security: C3is Inc. Common Stock, par value $0.01 per share
Symbol: CISS
Shares outstanding: 1,080,308 shares
Disclosed Ownership: 56,176 shares
Ownership: 5.2%
Form type: SCHEDULE 13G
Filing time: 27 Feb 2026, 16:00:16 UTC
Date of event: 27 Feb 2026
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Alta Partners LLC	5.2%	56,176	56,176	0	/s/ Steven Cohen	Steven Cohen, Managing Member