Alta Partners reports 56,176-share stake in C3is (5.2%)

C3is Inc. Schedule 13G filed by Alta Partners LLC reports beneficial ownership of 56,176 shares, representing shares issuable upon exercise of warrants, equal to 5.2% of the class.

Rhea-AI Filing Summary

C3is Inc. Schedule 13G filed by Alta Partners LLC reports beneficial ownership of 56,176 shares, representing shares issuable upon exercise of warrants, equal to 5.2% of the class. The filing states sole voting and dispositive power over the 56,176 shares. The form is signed by Steven Cohen on 02/27/2026.

Insights

Corporate Governance Analyst

Holdings disclosed: a 5.2% warrant-derived stake by Alta Partners LLC.

Alta Partners LLC reports beneficial ownership of 56,176 shares described as "shares issuable upon exercise of warrants." The filing therefore discloses potential exercisable interest rather than open-market purchases of outstanding shares.

Ownership is reported as sole voting and dispositive power. Subsequent filings or amendments may clarify exercise timing or any voting limitations tied to the warrants.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Alta Partners LLC report in CISS?

Alta Partners LLC reports beneficial ownership of 56,176 shares, equal to 5.2% of the class, described as shares issuable upon exercise of warrants and reported on 02/27/2026.

Are the reported CISS shares currently exercisable or outstanding?

The filing states the 56,176 shares are "shares issuable upon exercise of warrants," indicating they are tied to warrant exercise rather than described as currently outstanding common shares in the submission.

Who signed the Schedule 13G for Alta Partners LLC?

The Schedule 13G is signed by Steven Cohen, listed as Managing Member, certifying the ownership and the filing date of 02/27/2026 for Alta Partners LLC's reported position.

Does Alta Partners report voting or dispositive power over the reported shares?

Yes. Alta Partners LLC reports sole voting power and sole dispositive power over the 56,176 shares described in the filing, with 0 shared voting and dispositive power reported.

What does the filing say about control or intent to influence C3is Inc.?

The filer certifies the securities "were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer," asserting no intent to change control in the filing's signed statement.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 02/27/2026 - 04:00 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

C3is Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

Y18284177

(CUSIP Number)

02/27/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. Y18284177

1

Names of Reporting Persons

Alta Partners LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

NEW YORK

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 56,176.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 56,176.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

56,176.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.2 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: C3is Inc.
(b)	Address of issuer's principal executive offices: 331 KIFISSIAS AVENUE, ERITHREA, ATHENS, GREECE, 14561
Item 2.
(a)	Name of person filing: Alta Partners LLC
(b)	Address or principal business office or, if none, residence: 1205 Franklin Avenue Garden City, New York 11530
(c)	Citizenship: New York Limited Liability Company
(d)	Title of class of securities: Common Stock, par value $0.01 per share
(e)	CUSIP No.: Y18284177
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 56,176 shares, representing shares issuable upon exercise of warrants.
(b)	Percent of class: 5.2%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 56,176 shares
	(ii) Shared power to vote or to direct the vote: 0 shares
	(iii) Sole power to dispose or to direct the disposition of: 56,176 shares
	(iv) Shared power to dispose or to direct the disposition of: 0 shares
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Alta Partners LLC

Signature:	/s/ Steven Cohen
Name/Title:	Steven Cohen, Managing Member
Date:	02/27/2026