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C3is Inc.

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Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

C3is Inc.

CIK 0001951067CISS· quarter ending 2026-06-30
Shares outstanding
1,259,668
as of 2025-12-31 · 20-F cover page, filed 2026-04-22
Held by 13F filers
74,461
across share classes — see % per class below
Holders
3
+3 vs 2026-03-31 · 3 new, 0 exited
Value
$123K
shares +— vs prior quarter

Share classes (cover page of the 20-F filed 2026-04-22, as of 2025-12-31)

ClassListedShares outstandingHeld by 13F filers% of classHoldersCUSIP
Common Stock—659,668——
Series AConvertible Preferred Stock—600,000——
Not matched to a class74,461—Y18284300

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine
CountCUSIPClass (as filers write it)HoldersShares heldClass shares% of classValueOptionsMapped via
Y18284300COM374,461——$123K—13DGholders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 6 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (3 of 3 · Y18284300)

change vs 2026-03-31
#FilerShares% of classValueChange
1TOWERVIEW LLC50,000—$83KNEW
2HRT FINANCIAL LP24,459—$40KNEW
3Caitong International Asset Management Co., Ltd2—$3NEW

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting personFormFiledEventShares% of class
Dominion Capital GP LLCSCHEDULE 13G/A2026-10-052026-10-0100%
Alta Partners LLCSCHEDULE 13G/A2026-10-052026-08-2646,7733.1%
Gennadiy GurevichSCHEDULE 13G/A2026-10-052026-10-0100%
Dominion Capital LLCSCHEDULE 13G/A2026-10-052026-10-0100%
Ascent Partners Fund LLCSCHEDULE 13G/A2026-10-052026-10-0100%
Ascent Partners LLCSCHEDULE 13G/A2026-10-052026-10-0100%
Mikhail GurevichSCHEDULE 13G/A2026-10-052026-10-0100%
Masada Group Holdings LLCSCHEDULE 13G/A2026-10-052026-10-0100%
Eagle Claw Corp.SCHEDULE 13G/A2026-10-052026-10-0100%
Alon BrennerSCHEDULE 13G/A2026-10-052026-10-0100%
TOWERVIEW LLCSCHEDULE 13G/A2026-10-022026-08-19——
HORNE TIMOTHY PSCHEDULE 13G2026-09-032026-08-27135,0009.1%
Imperial Petroleum Inc.SCHEDULE 13D/A2026-08-282026-08-266,136,47580.5%
JANE STREET GROUP, LLCSCHEDULE 13G2026-08-192026-08-13937,3307.2%
Jane Street Global Trading, LLCSCHEDULE 13G2026-08-192026-08-13258,3702%
Jane Street Capital, LLCSCHEDULE 13G2026-08-192026-08-13678,9605.2%
S.H.N. Financial Investments Ltd.SCHEDULE 13G/A2026-08-142026-08-1446,7190.4%
L1 Capital Global Opportunities Master Fund, Ltd.SCHEDULE 13G/A2026-08-142026-08-14223,0381.7%
CVI Investments, Inc.SCHEDULE 13G2026-08-032026-07-271,221,1549.9%
Heights Capital Management, Inc.SCHEDULE 13G2026-08-032026-07-271,221,1549.9%
Lind Global Fund III LPSCHEDULE 13G2026-07-312026-06-281,325,4829.99%
EASTON JEFFSCHEDULE 13G2026-07-312026-06-281,325,4829.99%
Lind Global Partners III LLCSCHEDULE 13G2026-07-312026-06-281,325,4829.99%
Evergreen Capital Management LLCSCHEDULE 13G/A2026-05-112026-03-3127,7464.9%
Ayrton Capital LLCSCHEDULE 13G2026-02-112025-12-31856,2289.99%
Waqas KhatriSCHEDULE 13G2026-02-112025-12-31856,2289.99%
Alto Opportunity Master Fund, SPC - Segregated Master Portfolio BSCHEDULE 13G2026-02-112025-12-31856,2289.99%
Athanasios TsiakmakisSCHEDULE 13G/A2026-01-132026-01-09400,0005.02%
Evergreen Capital Management LLC/NVSCHEDULE 13G2026-01-082025-12-11443,21310%
Arethusa Properties LTDSCHEDULE 13D/A2025-10-102025-10-0972,3312.7%
Harry N. VafiasSCHEDULE 13D/A2025-10-102025-10-09100,5773.7%
Flawless Management Inc.SCHEDULE 13D/A2025-10-102025-10-0940.01%
Nikolaos VafiasSCHEDULE 13G/A2025-10-022025-09-3042,9462.7%
Pandora Consultants II SASCHEDULE 13G/A2025-10-022025-09-3042,9402.7%
Theano VafiasSCHEDULE 13G/A2025-10-022025-09-3042,9402.7%
Charles DavidsonSCHEDULE 13G/A2025-09-292025-09-19112,0147.02%
Joseph JacobsSCHEDULE 13G/A2025-09-292025-09-19112,0147.02%
WEXFORD CAPITAL LPSCHEDULE 13G/A2025-09-292025-09-19112,0147.02%
Wexford GP LLCSCHEDULE 13G/A2025-09-292025-09-19112,0147.02%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.