Ayrton Capital reveals 9.99% stake in C3IS (CISS)

Rhea-AI Filing Summary

C3IS INC. received a Schedule 13G reporting that Ayrton Capital LLC, Alto Opportunity Master Fund, SPC – Segregated Master Portfolio B, and Waqas Khatri beneficially own 856,228 shares of its common stock, representing 9.99% of the class.

The position consists of 260,617 shares of common stock and 595,611 shares issuable upon exercise of warrants, which are subject to a 9.99% beneficial ownership blocker. As of December 31, 2025, the reporting persons have sole voting and dispositive power over these shares and state the holdings are in the ordinary course of business, not to influence control.

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)

12/31/2025

(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

Ayrton Capital 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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 856,228.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 856,228.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

856,228.00

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)

9.99 %

12

Type of Reporting Person (See Instructions)

IA, CO

SCHEDULE 13G

CUSIP No. Y18284177

1

Names of Reporting Persons

Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B

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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 856,228.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 856,228.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

856,228.00

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)

9.99 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP No. Y18284177

1

Names of Reporting Persons

Waqas Khatri

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 856,228.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 856,228.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

856,228.00

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)

9.99 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: C3IS INC.
(b)	Address of issuer's principal executive offices: 331 Kifissias Avenue Kifissia, Athens, J3, 14561
Item 2.
(a)	Name of person filing: (i) Ayrton Capital LLC; (ii) Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B; and (iii) Waqas Khatri
(b)	Address or principal business office or, if none, residence: (i) Ayrton Capital LLC, 55 Post Rd West, 2nd Floor Westport, CT 06880; (ii) Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B, Suite #7 Grand Pavilion Commercial Centre, 802 West Bay Road, Grand Cayman, P.O. Box 10250, Cayman Islands; and (iii) Waqas Khatri 55 Post Rd West, 2nd Floor Westport, CT 06880
(c)	Citizenship: (i) Ayrton Capital LLC: United States; (ii) Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B: Cayman Islands; and (iii) Waqas Khatri: United States
(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: Ayrton Capital LLC: 856,228 ; (ii) Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B: 856,228 ; and (iii) Waqas Khatri: 856,228. Represents (i) 260,617 shares of Common Stock held by the Reporting Persons; and (ii) 595,611 shares of Common Stock issuable on the exercise of certain warrants (the "Warrants") held by the Reporting Persons. The issuable shares of Common Stock related to the exercise of the Warrants are subject to a 9.99% beneficial ownership blocker. The shares reported herein represent Common Stock of C3IS INC. (the "Issuer") held by Alto Opportunity Master Fund, SPC- Segregated Master Portfolio B, a Cayman Islands exempted company (the "Fund"). The Fund is a private investment vehicle for which Ayrton Capital LLC, a Delaware limited liability company (the "Investment Manager"), serves as the investment manager. Waqas Khatri serves as the managing member of the Investment Manager (all of the foregoing, collectively, the "Reporting Persons").
(b)	Percent of class: The percentages below are based on (i) 7,968,378 shares of Common Stock of the Issuer that were outstanding as of December 12, 2025; and (ii) 595,611 shares of Common Stock issuable on the exercise of the Warrants held by the Reporting Persons. The amount of shares outstanding was based upon a statement in the Issuer's Post-Effective Amendment No. 5 to Form F-1 Registration Statement filed on December 19, 2025. For the sake of clarity, the holdings of the Reporting Persons reported herein are as of December 31, 2025. (i) Ayrton Capital LLC: 9.99%; (ii) Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B: 9.99%; and (iii) Waqas Khatri: 9.99%.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: (i) Ayrton Capital LLC: 856,228; (ii) Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B: 856,228; and (iii) Waqas Khatri: 856,228
	(ii) Shared power to vote or to direct the vote: (i) Ayrton Capital LLC: 0; (ii) Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B: 0; and (iii) Waqas Khatri: 0
	(iii) Sole power to dispose or to direct the disposition of: (i) Ayrton Capital LLC: 856,228; Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B: 856,228; Waqas Khatri:856,228
	(iv) Shared power to dispose or to direct the disposition of: (i) Ayrton Capital LLC: 0; (ii) Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B: 0; (iii) Waqas Khatri: 0
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.

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.

Ayrton Capital LLC

Signature:	/s/ Waqas Khatri
Name/Title:	Waqas Khatri / Managing Member
Date:	02/11/2026

Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B

Signature:	/s/ Waqas Khatri
Name/Title:	Waqas Khatri / Director
Date:	02/11/2026

Waqas Khatri

Signature:	/s/ Waqas Khatri
Name/Title:	Waqas Khatri
Date:	02/11/2026

FAQ

How much of C3IS INC. (CISS) do Ayrton Capital and affiliates own?

Ayrton Capital LLC, Alto Opportunity Master Fund, and Waqas Khatri report beneficial ownership of 856,228 C3IS INC. common shares, equal to 9.99% of the class. This total combines existing shares and shares issuable from warrants under a beneficial ownership cap.

What makes up the 856,228 C3IS INC. shares reported on this Schedule 13G?

The reported 856,228 shares include 260,617 outstanding C3IS common shares plus 595,611 shares issuable upon exercise of warrants. Those warrant shares are counted for beneficial ownership but are constrained by a 9.99% ownership blocker for the reporting holders.

Who are the reporting persons on this C3IS INC. Schedule 13G filing?

The filing lists three reporting persons: Ayrton Capital LLC, Alto Opportunity Master Fund, SPC – Segregated Master Portfolio B, and Waqas Khatri. Ayrton Capital acts as investment manager to the fund, and Khatri is the managing member of Ayrton Capital.

What does the 9.99% beneficial ownership blocker mean for C3IS (CISS) warrants?

The filing states that shares issuable from the warrants are subject to a 9.99% beneficial ownership blocker. This limits exercises so the reporting persons’ total beneficial ownership of C3IS common stock does not exceed 9.99% at any time.

As of what dates are the C3IS INC. ownership figures in the Schedule 13G calculated?

The 9.99% stake is based on 7,968,378 C3IS shares outstanding as of December 12, 2025, plus warrant shares. The filing clarifies that the reporting persons’ holdings are measured as of December 31, 2025.

Do Ayrton Capital and related parties seek control of C3IS INC. with this stake?

The certification states the securities were acquired and are held in the ordinary course of business and not for changing or influencing control of C3IS INC., nor in connection with any transaction aimed at obtaining such control.