SCHEDULE 13G Filed 2026-08-19 Event — SEC 0001595888-26-000109 →

JANE STREET GROUP, LLC → C3is Inc. CISS

Stake: — Shares: — Class: common stock, par value $0.01 per share

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

9 13D/G filings on this issuer

8 other filings besides this one

Filer Track Record

21 filings by this filer

20 other filings in the data moat

Short Interest · settle 2026-07-31

DTC 1.00

2,866,583 shares short · +4600.9% vs prior

Other 13D/G Filings on C3is Inc.

Filed	Form	Filer	Stake	Shares
2026-08-04	SCHEDULE 13G	Ascent Partners Fund LLC	—	—	view →
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 →

Other Filings by JANE STREET GROUP, LLC

Filed	Form	Issuer	Stake	Shares
2026-08-21	SCHEDULE 13G	CDT Environmental Technology Investment Holdings Ltd	—	—	view →
2026-07-29	SCHEDULE 13G	AEHR TEST SYSTEMS	—	—	view →
2026-07-15	SCHEDULE 13G	Agape ATP Corp	—	—	view →
2026-07-13	SCHEDULE 13G	ETSY INC	—	—	view →
2026-07-02	SCHEDULE 13G	SUNation Energy, Inc. SUNE	—	—	view →
2026-07-02	SCHEDULE 13G	CXApp Inc. CXAIW	—	—	view →
2026-07-02	SCHEDULE 13G	HERTZ GLOBAL HOLDINGS, INC HTZWW	—	—	view →
2026-06-25	SCHEDULE 13G	Leslie's, Inc. LESL	—	—	view →
2026-06-24	SCHEDULE 13G	Ascent Solar Technologies, Inc. ASTI	—	—	view →
2026-06-24	SCHEDULE 13G	Galaxy Digital Inc. GLXY	—	—	view →
2026-06-23	SCHEDULE 13G	Sleep Number Corp SNBRQ	—	—	view →
2026-06-23	SCHEDULE 13G	Jiuzi Holdings, Inc. JZXN	—	—	view →
2026-06-22	SCHEDULE 13G	POET TECHNOLOGIES INC. POET	—	—	view →
2026-06-16	SCHEDULE 13G	Super Micro Computer, Inc. SMCIP	—	—	view →
2026-06-16	SCHEDULE 13G	Alpha Compute Corp ALP	—	—	view →
2026-06-09	SCHEDULE 13G	GeoVax Labs, Inc. GOVX	—	—	view →
2026-06-09	SCHEDULE 13G	Bitdeer Technologies Group BTDR	—	—	view →
2026-06-04	SCHEDULE 13G	Fabric.AI, Inc. FABC	—	—	view →
2026-06-03	SCHEDULE 13G	Co-Diagnostics, Inc. CODX	—	—	view →
2026-05-26	SCHEDULE 13G	Core Scientific, Inc./tx CORZR	—	—	view →

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