C3is (CISS) CEO files Form 3 initial insider ownership

Rhea-AI Filing Summary

C3is Inc. CEO and President Adamantios Andriotis filed an initial insider ownership report on Form 3. This filing establishes his status as a director and officer of C3is Inc. The data provided shows no reported stock purchases, sales, or other equity transactions.

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^*

Andriotis Adamantios

(Last) (First) (Middle)

C3IS INC.

331 KIFISSIAS AVENUE ERITHREA

(Street)

ATHENS GREECE 14561

(City) (State) (Zip)

GREECE

(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
X	Officer (give title below)		Other (specify below)
	CEO and President

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)

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

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/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 filing show?

The Form 3 filing shows that Adamantios Andriotis is a director and CEO and President of C3is Inc. It is an initial insider ownership report and, in this data, does not list any buy, sell, or other equity transactions.

Who is the reporting person in the C3is Inc. (CISS) Form 3?

The reporting person is Adamantios Andriotis, who serves as both a director and the CEO and President of C3is Inc. The filing identifies his roles but does not detail any specific stock transactions in this excerpt.

Does the C3is Inc. (CISS) Form 3 show any insider stock trades?

No, the Form 3 data provided shows no reported transactions. All transaction counts, including buys, sells, exercises, gifts, tax withholding, and restructurings, are listed as zero, indicating no insider trading activity in this particular filing excerpt.

Is the C3is Inc. (CISS) CEO reported as a major shareholder in this Form 3?

In this Form 3, Adamantios Andriotis is not flagged as a ten percent owner. The data lists his status as director and officer but marks the ten percent owner field as zero, indicating he is not reported as a 10% holder here.

What types of insider activities are summarized in the C3is (CISS) Form 3 data?

The summary includes counts for buys, sells, option exercises, gifts, tax withholding, restructurings, and derivative transactions. In this case, every category is zero, meaning no insider equity activity is reported within this Form 3 dataset.