C3IS INC

Historical 13F Holders

Reported Value, Excluding Options

Total Filings

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Each filer's latest filing for Y18284300 since 12/18/2024, largest first.

Filer	% of Class	Shares	Form	Filed
Imperial Petroleum Inc./Marshall Islands 13D/A	68.8%	28,846,153	13D/A	7/30/2026 Event 7/28/2026
Lind Global Fund III LP 13G	10.0%	1,325,482	13G	7/31/2026 Event 6/28/2026
Lind Global Fund III LP	10.0%	1,325,482
Lind Global Partners III LLC	10.0%	1,325,482
Easton Jeff	10.0%	1,325,482
CVI Investments, Inc. 13G	9.9%	1,221,154	13G	8/3/2026 Event 7/27/2026
CVI Investments, Inc.	9.9%	1,221,154
Heights Capital Management, Inc.	9.9%	1,221,154
Alta Partners LLC 13G/A	8.2%	1,168,303	13G/A	8/3/2026 Event 7/28/2026
Jane Street Group, LLC 13G	7.2%	937,330	13G	8/19/2026 Event 8/13/2026
Jane Street Group, LLC	7.2%	937,330
Jane Street Capital, LLC	5.2%	678,960
Jane Street Global Trading, LLC	2.0%	258,370
Under 5%, checked the "5 percent or less" box, or amended by a later filing (3)
Evergreen Capital Management LLC/NV 13G/A	4.9%	27,746	13G/A	5/11/2026 Event 3/31/2026
Ascent Partners Fund LLC 13G/A	0%	0	13G/A	10/5/2026 Event 10/1/2026
Ascent Partners Fund LLC	0%	0
Ascent Partners LLC	0%	0
Dominion Capital LLC	0%	0
Dominion Capital GP LLC	0%	0
Eagle Claw Corp.	0%	0
Masada Group Holdings LLC	0%	0
Mikhail Gurevich	0%	0
Gennadiy Gurevich	0%	0
Alon Brenner	0%	0
Towerview LLC 13G/A	Checked 5% or less		13G/A	10/2/2026 Event 8/19/2026

Period	Filings	Shares, Excl. Options	Value, Excl. Options	Options Value
2026 Q2	3	74.5 k	$123 k	$0