Insider Transactions Reported by 5 Insiders of C3is Inc.

Symbol: CISS on Nasdaq
Location: Athens, Greece

Quick Takeaways

CISS - C3is Inc. has 5 insiders with reported activity on this page.
No net insider buy/sell flow is currently reported for the last year.
Recent transaction rows are available for direct filing-level review.

What Changed

No meaningful buy/sell imbalance is currently visible in the one-year window.
Activity will update as new Forms 3/4/5 are filed.

Why This Matters

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Source Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 07 May 2025.

Buys

Shares: 0

Insiders: 0

Sells

Shares: 0

Insiders: 0

Net

Shares: 0

Insiders: 0

Window (months)	Buy $	Sell $	Net $
0-3	$0	$0	$0
3-6	$0	$0	$0
6-9	$0	$0	$0
9-12	$0	$0	$0

C3is Inc. executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Valuation	Report Date
Harry Vafias	Director	$668	Market	18 Mar 2026
Adamantios Andriotis	CEO and President, Director		Mixed	18 Mar 2026
Nina Sarojini Pyndiah	Chief Financial Officer		Mixed	18 Mar 2026
Georgios Xiradakis	Director		Mixed	18 Mar 2026
Ioannis Kostogiannis	Director		Mixed	18 Mar 2026

Top shareholders of C3is Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Evergreen Capital Management LLC/NV	13D/G	Evergreen Capital Management LLC	10%	443,213	$762,326	$0	11 Dec 2025	13D/G
Athanasios Tsiakmakis	13D/G	—	5%	400,000	$688,000	+$421,400	09 Jan 2026	13D/G
L1 Capital Global Opportunities Master Fund, Ltd.	13D/G	—	10%	443,213	$651,523	$0	11 Dec 2025	13D/G
S.H.N. Financial Investments Ltd.	13D/G	—	10%	443,213	$651,523	+$542,486	11 Dec 2025	13D/G
Flawless Management Inc.	13D/G	Harry N. Vafias	3.7%	100,577	$229,316	$0	09 Oct 2025	13D/G
L1 Global Manager Pty Ltd	13F	Company	19%	861,260	$198,090	—	31 Dec 2025	13F
Pandora Consultants II SA	13D/G	Nikolaos Vafias	2.7%	42,946	$97,917	$0	30 Sep 2025	13D/G
Alta Partners LLC	13D/G	—	5.2%	56,176	$80,893	$0	27 Feb 2026	13D/G
WEXFORD CAPITAL LP	13F 13D/G	Company	7% from 13D/G	112,014	$25,760	—	31 Dec 2025	13F 13D/G
CITADEL ADVISORS LLC	13F	Company	1.1%	47,635	$10,956	—	31 Dec 2025	13F
Sassicaia Capital Advisers LLC	13F	Company	0.44%	19,641	$4,517	—	31 Dec 2025	13F
UBS Group AG	13F	Company	0.14%	6,131	$1,410	—	31 Dec 2025	13F
Harry Vafias	3/4/5	Director	0.11%	4,778	$668	—	18 Mar 2026	3/4/5
Imperial Petroleum Inc./Marshall Islands	13D/G	Imperial Petroleum Inc.	90%	4,994,672	—	$0	04 May 2026	13D/G
Ayrton Capital LLC	13D/G	—	10%	856,228	—	$0	31 Dec 2025	13D/G

Recent Insider Transactions by Companies or Individuals for C3is Inc.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
Harry Vafias	CISS	Common Stock					0	3,616	18 Mar 2026	By Arethusa Properties LTD
Harry Vafias	CISS	Common Stock					0	1,162	18 Mar 2026	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.