Who owns CISS - C3is Inc. - Common Stock, par value $0.01 per share based on 13F filings?

Open this security page to review the newest available 13F ownership history, top reported holders, and period-by-period changes.

Security Snapshot

C3is Inc. - Common Stock, par value $0.01 per share (CISS) Institutional Ownership

Q: What is CUSIP Y18284177?

CUSIP Y18284177 is the security identifier used in SEC filing datasets for CISS - C3is Inc. - Common Stock, par value $0.01 per share.

CUSIP: Y18284177

13F Institutional Holders and Ownership History for Q1 2026

Latest Period

n/a

Institutions Reporting

Shares (Excl. Options)

Price

$0.82

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Type / Class: Equity / Common Stock, par value $0.01 per share
Symbol: CISS on Nasdaq
Shares outstanding: 1,080,308
Price per share: $0.82

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

Quick Takeaways

CISS - C3is Inc. - Common Stock, par value $0.01 per share is tracked under CUSIP Y18284177.
Latest finished 13F holder period is not available.
3 significant owners is listed from Schedule 13D/13G reporting.

What Changed

Latest quarter on this page is Q1 2026.
Additional quarter-over-quarter change detail appears as history expands.

Why This Matters

You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Source Evidence

Source: SEC Schedule 13D/G

Ownership context comes from Schedule 13D/G and available holder history for this CUSIP.

Open SEC Evidence

Investment Quick Answers

What is CUSIP Y18284177?
CUSIP Y18284177 identifies CISS - C3is Inc. - Common Stock, par value $0.01 per share in SEC 13F datasets.

Where can I see the latest institutional holders?
Use the ownership history tables below to review the newest available institutional filing periods.

Next ownership checks

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Latest 13F filings when you want to inspect fresh institutional portfolio moves.
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Recent Quarterly Holder Reports

Open recent reporting periods for CUSIP Y18284177:

Q1 2026 (1 holder)

Significant Owners of C3is Inc. - Common Stock, par value $0.01 per share (CISS) based on Schedule 13D/G filings

Filer	Ownership	Holdings Value	Nb Shares	Reporting Name	Report Period
Imperial Petroleum Inc./Marshall Islands	82%		9,913,422	Imperial Petroleum Inc.	02 Feb 2026
Ayrton Capital LLC	10%		856,228	Ayrton Capital LLC	31 Dec 2025
Alta Partners LLC	5.2%	$80,893	56,176	Alta Partners LLC	27 Feb 2026

Institutional Holders of C3is Inc. - Common Stock, par value $0.01 per share (CISS) across Reporting Periods

Period	Reported Shares, Excl. Options	Value, Excl. Options	Value Change	Puts Notional Value	Calls Notional Value	Price (Median)	Investors
2026 Q1	1,508	$1,247	+$1,247			$0.83	1