C3is Inc. holder updates 0.4% warrant stake

Rhea-AI Filing Summary

S.H.N. Financial Investments Ltd. reports its beneficial ownership in C3is Inc. as an amendment, now reflecting a position below 5% of the company’s common shares. The filing lists 46,719 Series D Warrants to purchase common shares, representing 0.4% of the class.

The percentage is calculated against 13,082,612 common shares outstanding, as referenced from a July 28, 2026 prospectus. S.H.N. holds sole voting and dispositive power over these 46,719 warrants. Nir Shamir, as Chief Executive Officer of S.H.N., may be deemed a beneficial owner but disclaims beneficial ownership for other purposes.

Key Figures

Beneficially owned warrants: 46,719 Series D Warrants Percent of class owned: 0.4% Shares outstanding baseline: 13,082,612 common shares +3 more

6 metrics

Beneficially owned warrants 46,719 Series D Warrants Series D Warrants to purchase common shares reported as beneficially owned

Percent of class owned 0.4% Beneficial ownership percentage of C3is Inc. common shares

Shares outstanding baseline 13,082,612 common shares Common shares outstanding referenced from July 28, 2026 prospectus

Prior reported common shares 443,213 common shares Common shares covered by prior Schedule 13G filed December 18, 2025

Sole voting power 46,719 Number of shares for which sole voting power is reported

Filing sign date 08/14/2026 Date the amendment was signed by the reporting person’s CEO

Key Terms

beneficially own, Series D Warrants, Schedule 13G, disclaims beneficial ownership, +1 more

5 terms

beneficially own regulatory

"may be deemed to beneficially own (as that term is defined in Rule 13d-3)"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

Series D Warrants financial

"represent 46,719 Series D Warrants to purchase Common Shares"

Series D warrants are tradable rights issued with a company's Series D financing round that allow the holder to buy a set number of shares at a fixed price for a limited period. They matter to investors because they create potential extra upside if the company’s value rises, but can also dilute existing shareholders when converted—think of them as coupons you can redeem for stock if the price becomes favorable, affecting ownership and future per-share value.

Schedule 13G regulatory

"This amendment refers to a filed with the on December 18, 2025"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

disclaims beneficial ownership regulatory

"Mr. Shamir disclaims beneficial ownership of these securities for all other purposes"

sole dispositive power financial

"Sole Dispositive Power 46,719.00 8 | Shared Dispositive Power 0.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

FAQ

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

What ownership in C3is Inc. (CISS) does S.H.N. Financial Investments report in this Schedule 13G/A?

S.H.N. Financial Investments reports beneficial ownership of 46,719 Series D Warrants to purchase C3is Inc. common shares, representing 0.4% of the outstanding common shares based on 13,082,612 shares outstanding.

Does S.H.N. Financial Investments Ltd. own more than 5% of C3is Inc. (CISS)?

No. The filing states S.H.N. Financial Investments owns 0.4% of C3is Inc.’s common shares on a beneficial basis, which is explicitly described as ownership of 5 percent or less of the class.

What securities of C3is Inc. (CISS) are covered in this Schedule 13G/A amendment?

The amendment covers 46,719 Series D Warrants to purchase C3is Inc. common shares. These warrants are treated as the beneficially owned securities for voting and dispositive power disclosure purposes.

How is the 0.4% ownership in C3is Inc. (CISS) calculated in this filing?

The 0.4% ownership figure is based on 13,082,612 common shares outstanding, as referenced from C3is Inc.’s prospectus filed under Rule 424(b)(4) with the SEC on July 28, 2026.

Who signed the Schedule 13G/A for S.H.N. Financial Investments regarding C3is Inc. (CISS)?

The amendment is signed by Nir Shamir, Chief Executive Officer of S.H.N. Financial Investments Ltd., on 08/14/2026, in his capacity as CEO of the reporting person.

What prior activity does this Schedule 13G/A amendment reference for C3is Inc. (CISS)?

The amendment refers to a prior Schedule 13G filed on December 18, 2025, which covered 443,213 common shares purchased on December 11, 2025 before the ownership dropped below 5%.

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

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Available on EDGAR 08/14/2026 - 08:02 AM Accepted by SEC EDGAR 08/14/2026 - 08:00 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

C3is Inc.

(Name of Issuer)

Common Shares, par value $0.01

(Title of Class of Securities)

Y18284169

(CUSIP Number)

08/14/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): Y18284169

1

Names of Reporting Persons

S.H.N. Financial Investments Ltd.

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

ISRAEL

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 46,719.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 46,719.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

46,719.00

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)

0.4 %

12

Type of Reporting Person (See Instructions)

FI

SCHEDULE 13G

Item 1.
(a)	Name of issuer: C3is Inc.
(b)	Address of issuer's principal executive offices: 331 Kifissias Avenue, Kifissia14561 Athens, Greece, 14561
Item 2.
(a)	Name of person filing: S.H.N. Financial Investments Ltd.
(b)	Address or principal business office or, if none, residence: Herzliya Hills Arik Einstein 3, Israel, 4610301
(c)	Citizenship: Israel
(d)	Title of class of securities: Common Shares, par value $0.01
(e)	CUSIP No.: Y18284169
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: 46,719 This amendment refers to a Schedule 13G filed with the Securities and Exchange Commission on December 18, 2025, covering 443,213 Common Shares purchased on December 11, 2025. The amounts in Row (5), (7) and (9) represent 46,719 Series D Warrants to purchase Common Shares. The percentage set forth on Row (11) of the cover page for the reporting person is based on 13,082,612 Common Shares outstanding, based on the Issuer's Prospectus filed under Rule 424(b)(4) with the Securities and Exchange Commission on July 28, 2026. Nir Shamir is the Chief Executive Officer of the Reporting Person. As such, Mr. Shamir may be deemed to beneficially own (as that term is defined in Rule 13d-3 under the Securities Exchange Act of 1934) the securities described herein. To the extent Mr. Shamir is deemed to beneficially own such securities, Mr. Shamir disclaims beneficial ownership of these securities for all other purposes.
(b)	Percent of class: 0.4%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 46,719
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 46,719
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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 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.

S.H.N. Financial Investments Ltd.

Signature:	/s/ Nir Shamir
Name/Title:	Nir Shamir, Chief Executive Officer
Date:	08/14/2026