Harry Vafias reports C3is (CISS) insider holdings and stock option

Rhea-AI Filing Summary

C3is Inc. director Harry Vafias filed an initial ownership report showing his equity stake. He directly holds 1,162 shares of common stock and indirectly holds 3,616 shares through Arethusa Properties LTD. He also has a stock option over 500 common shares at an exercise price of $348.00 per share, half of which is already vested and exercisable, with the remaining half scheduled to vest on September 16, 2026, subject to his continued service.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Vafias Harry

(Last) (First) (Middle)

C3IS INC.

331 KIFISSIAS AVENUE ERITHREA

(Street)

ATHENS 14561

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
C3is Inc. [ CISS ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	1,162	D
Common Stock	3,616	I	By Arethusa Properties LTD(1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	(2)	09/16/2034	Common Stock	500	$348	D

Explanation of Responses:

1. Shares held by Arethusa Properties LTD ("Arethusa"). The Reporting Person controls Arethusa and may be deemed to beneficially own the securities held by Arethusa by virtue of such control. The Reporting Person disclaims beneficial ownership of such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 of the Exchange Act or for any other purpose.

2. 50% of the shares subject to such option are vested and exercisable. The remaining 50% of the shares subject to such option vest and become exercisable on September 16, 2026, subject to the Reporting Person's continuous service to the Issuer on such date.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Nina Pyndiah, Attorney-in-Fact	03/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What does the C3is Inc. (CISS) Form 3 filed by Harry Vafias show?

The Form 3 shows director Harry Vafias’ initial ownership in C3is Inc., including direct and indirect common shares and a stock option position. It establishes his starting equity stake as a reporting insider under Section 16 of the Exchange Act.

How many C3is Inc. (CISS) common shares does Harry Vafias directly own?

Harry Vafias directly owns 1,162 shares of C3is Inc. common stock. This direct holding is reported under his name and reflects shares held personally, separate from any indirect ownership through affiliated entities.

What indirect C3is Inc. (CISS) holdings does Arethusa Properties LTD report?

The filing reports 3,616 C3is Inc. common shares held indirectly through Arethusa Properties LTD. Vafias controls Arethusa and may be deemed to beneficially own these securities, while formally disclaiming beneficial ownership except to the extent of any pecuniary interest.

What are the terms of Harry Vafias’ C3is Inc. stock option?

Vafias holds a stock option over 500 C3is Inc. common shares at an exercise price of $348.00 per share. Half of these shares are vested and exercisable, with the remaining 50% vesting on September 16, 2026, subject to his continuous service.

Does the C3is Inc. (CISS) Form 3 show any recent insider buying or selling?

The Form 3 does not report any buy or sell transactions. It only lists Harry Vafias’ existing direct and indirect common stock holdings and his stock option position as of the reported date, serving as an initial ownership statement.