TowerView LLC holds 35,000 shares of C3is Inc. (CISS) as 6.5% stake

Rhea-AI Filing Summary

C3is Inc. disclosure: TowerView LLC reports beneficial ownership of 35,000 shares of Common Stock, representing 6.5% of the class as of 05/18/2026. The filing shows TowerView holds sole voting and sole dispositive power over these shares.

Insights

Governance Analyst

TowerView LLC reports a passive ownership stake of 6.5% with full voting and dispositive authority.

The filing is a Schedule 13G disclosure listing 35,000 shares beneficially owned as of 05/18/2026. It records sole voting and sole dispositive power, indicating TowerView can vote and direct disposition of these shares.

Timing and holdings are explicit; subsequent filings would show any change in percentage or holdings. Cash‑flow treatment and any plan for sales are not included in the excerpt.

Capital Markets Analyst

A 6.5% stake is a notable minority position but not a control change.

The position size (35,000 shares) is material enough to be disclosed on Schedule 13G but does not, by itself, indicate a takeover or change of control. The filing lists the issuer address and CUSIP Y18284300.

Market impact depends on whether TowerView later trades or files a different reporting form; the excerpt contains no sales, purchases, or transfer plans.

Key Figures

Shares beneficially owned: 35,000 shares Percent of class: 6.5% Filing date: 05/18/2026 +3 more

6 metrics

Shares beneficially owned 35,000 shares reported ownership

Percent of class 6.5% percentage of Common Stock as reported

Filing date 05/18/2026 date of signature on Schedule 13G

CUSIP Y18284300 identifier for the reported Common Stock

Sole voting power 35,000 shares shares with sole power to vote

Sole dispositive power 35,000 shares shares with sole power to dispose

Key Terms

Schedule 13G, Beneficially owned, Sole dispositive power

3 terms

Schedule 13G regulatory

"Name of form: Schedule 13G; passive investor disclosure"

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.

Beneficially owned financial

"Amount beneficially owned: 35000"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole dispositive power financial

"Sole power to dispose or to direct the disposition of: 35,000"

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.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

C3is Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

Y18284300

(CUSIP Number)

05/18/2026

(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): Y18284300

1

Names of Reporting Persons

TOWERVIEW 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 35,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 35,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

35,000.00

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)

6.5 %

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: TowerView LLC
(b)	Address or principal business office or, if none, residence: Suite 1200 500 Park Avenue New York, NY 10022
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): Y18284300
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: 35000
(b)	Percent of class: 6.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 35,000
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 35,000
	(iv) Shared power to dispose or to direct the disposition of: 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 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.

TOWERVIEW LLC

Signature:	Daniel R. Tisch
Name/Title:	Member
Date:	05/18/2026

FAQ

What stake does TowerView LLC report in C3is Inc. (CISS)?

TowerView LLC reports beneficial ownership of 35,000 shares, representing 6.5% of C3is Inc.'s Common Stock as of 05/18/2026. The filing lists sole voting and sole dispositive power for those shares.

What form was filed to disclose TowerView's stake in CISS?

TowerView filed a Schedule 13G to report passive beneficial ownership of Common Stock. The document lists the issuer's CUSIP Y18284300 and the filer’s Delaware citizenship and address.

Does the filing show TowerView can vote the shares it owns?

Yes. The filing states TowerView has sole power to vote and sole power to dispose of 35,000 shares, indicating full voting and dispositive authority over the reported stake.

Is this Schedule 13G evidence of an acquisition or planned sale?

The filing documents existing beneficial ownership of 35,000 shares (6.5%) as of 05/18/2026. It does not disclose any planned acquisitions or dispositions; transaction plans are not included in the excerpt.

What is the issuer address and CUSIP listed in the filing for CISS?

The filing lists the issuer address as 331 Kifissias Avenue, Erithrea, Athens, Greece, 14561 and the CUSIP as Y18284300 for the reported Common Stock class.