Security Snapshot

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

CUSIP: Y18284300

13F Institutional Holders and Ownership History for Q2 2026

Latest Period

n/a

Institutions Reporting

Shares (Excl. Options)

Price

$1.79

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Security type / class
Equity / Common Stock, par value $0.01 per share
Symbol
CISS on Nasdaq
Shares outstanding
16,121,782
SEC-reported price per share
$1.79
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors

Key facts

  • CISS - C3is Inc. - Common Stock, par value $0.01 per share is tracked under CUSIP Y18284300.
  • Latest finished 13F holder period is not available.
  • 5 significant owners is listed from Schedule 13D/13G reporting.

Change

  • Latest quarter on this page is Q2 2026.
  • Additional quarter-over-quarter change detail appears as history expands.

Research use

  • 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.

Evidence

Source: SEC Schedule 13D/G

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

Open SEC evidence

Security key

Y18284300

Latest holder period

n/a

13F holders

13D/G owners

5

CIK / CUSIP context first

CISS full holder history C3is Inc. SEC filings C3is Inc. company facts C3is Inc. insider transactions

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

13D/G owners

Significant owners

Large-stake holder rows connected to Schedule 13D/G evidence.

Rows
5
Security
CISS
Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
Imperial Petroleum Inc./Marshall Islands 69% -17% $47,307,691 +$35,546,360 28,846,153 +302% Imperial Petroleum Inc. 28 Jul 2026
Ascent Partners Fund LLC 10% $2,882,913 1,610,566 Ascent Partners Fund LLC 28 Jul 2026
Lind Global Fund III LP 10% $2,372,613 1,325,482 Lind Global Fund III LP 28 Jun 2026
CVI Investments, Inc. 9.9% $2,185,866 1,221,154 CVI Investments, Inc. 27 Jul 2026
Alta Partners LLC 8.2% $2,091,262 1,168,303 Alta Partners LLC 28 Jul 2026

Quarter history

Institutional holders across reporting periods

Holder count, reported shares/value, and median price by quarter.

Periods
1
Latest
n/a
Rows shown
1-1 of 1
Period 13F Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q2 50,000 $83,000 +$83,000 $1.66 1
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