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ISSUER PROFILE · CIK 0001951067 · CUSIP Y18284300

C3is Inc.CISS

7 13D/G filings 3 distinct filers 0 insider transactions (365d)

Post-Filing Returns · across 5 activist filings on this issuer

Median 30d
-20.4%
avg -13.5%
Median 60d
-28.2%
avg -28.8%
Median 90d
-90.1%
avg -80.8%
Median 180d
-98.3%
avg -87.6%

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
7
2 SCHEDULE 13D/A · 1 SCHEDULE 13G · 4 SCHEDULE
Distinct filers
3
multi-activist cluster
Insiders (365d)
0
0 buys · 0 sales
Latest short DTC
1.00
as of 2026-07-15

13D/G Filings Timeline · 7 total

FiledFormFilerStakeSharesIntent
2026-07-30 SCHEDULE 13D/A Imperial Petroleum Inc./Marshall Islands 68.80% 28,846,153 view →
2026-06-24 SCHEDULE 13D/A Imperial Petroleum Inc./Marshall Islands 82.90% 7,171,543 view →
2026-05-18 SCHEDULE 13G TOWERVIEW LLC view →
2025-10-10 SCHEDULE Imperial Petroleum Inc./Marshall Islands 68.80% 6,000,000 view →
2025-10-10 SCHEDULE Flawless Management Inc. 3.70% 100,577 view →
2025-10-01 SCHEDULE Flawless Management Inc. 6.30% 100,577 view →
2025-01-14 SCHEDULE Imperial Petroleum Inc./Marshall Islands 73.10% 11,532,251 view →

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-07-15 60,980 1.00 +69.4%
2026-06-30 36,007 1.00 -56.4%
2026-06-15 82,532 1.00 +69.8%
2026-05-29 48,614 1.00 -53.3%
2026-05-15 104,053 3.08 +22.4%
2026-04-30 84,980 1.11 +699.4%
2026-04-15 10,631 1.00 -81.8%
2026-03-31 58,387 1.00 -3.7%
2026-03-13 60,614 1.00 -75.9%
2026-02-27 251,601 1.00 -7.5%
2026-02-13 271,959 1.00 +56.0%
2026-01-30 174,310 1.00 +187.7%

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