C3is sets 1-for-40 reverse stock split for Aug. 18

C3is Inc. announced a one-for-forty (1-for-40) reverse stock split of its common stock, par value $0.01 per share.

Rhea-AI Filing Summary

C3is Inc. announced a one-for-forty (1-for-40) reverse stock split of its common stock, par value $0.01 per share. The reverse split will take effect at 11:59 p.m. Eastern Time on August 18, 2026. The company’s common stock will begin trading on a split-adjusted basis on The Nasdaq Capital Market at the opening of trading on August 19, 2026. This corporate action is also incorporated by reference into the company’s existing Form S-8 and Form F-3 registration statements.

Filing Explained

The disclosed reverse split consolidates the share count and raises the per-share price proportionally; the split itself does not change company value, so its structural effect is on share units rather than the company’s value.

Key Figures

Reverse split ratio: 1-for-40 Effective time of reverse split: 11:59 p.m. Eastern Time on August 18, 2026 Start of split-adjusted trading: August 19, 2026

3 metrics

Reverse split ratio 1-for-40 Reverse stock split of common stock

Effective time of reverse split 11:59 p.m. Eastern Time on August 18, 2026 Time when the reverse stock split takes effect

Start of split-adjusted trading August 19, 2026 Date trading on The Nasdaq Capital Market begins on a split-adjusted basis

Key Terms

reverse stock split, split-adjusted basis, Registration Statement on Form S-8, Registration Statement on Form F-3

4 terms

reverse stock split financial

"announcing a one-for-forty (1-for-40) reverse stock split of the Company’s common stock"

A reverse stock split reduces a company's number of outstanding shares while raising the price per share proportionally, so the total value of each investor's holding is unchanged; a 1-for-10 split turns 100 shares worth $1 each into 10 shares worth $10 each. Companies often do this to regain compliance with an exchange's minimum price rule or to attract investors who avoid very low-priced stocks.

split-adjusted basis financial

"common stock will begin trading on a split-adjusted basis on The Nasdaq Capital Market"

An adjustment to historical share prices and share counts that reflects past stock splits or reverse splits so that old data lines up with the current number of shares. Think of it like resizing an old photograph so it matches a new frame: it keeps price charts, returns and per‑share metrics comparable over time, which matters to investors who need accurate performance, valuation and trend analysis.

Registration Statement on Form S-8 regulatory

"incorporated by reference into the Company’s Registration Statement on Form S-8"

A registration statement on Form S-8 is the U.S. Securities and Exchange Commission filing companies use to register shares they intend to grant to employees, directors, consultants or benefit plans under stock compensation programs. It matters to investors because it signals potential issuance of new shares tied to pay and incentives, which can increase the total shares outstanding — like adding more slices to a pie — reducing each existing share’s ownership and potentially affecting earnings per share and stock value.

Registration Statement on Form F-3 regulatory

"and Registration Statement on Form F-3 (Reg. No. 333-285135)"

A registration statement on Form F-3 is a streamlined filing used by eligible foreign companies to register securities for sale in the U.S., often as a “shelf” that lets them offer shares quickly when market conditions are right. For investors it matters because it signals that the company can raise capital on short notice—potentially increasing liquidity but also the risk of share dilution if new stock is issued—similar to a company keeping a pre-approved credit line ready to use.

FAQ

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

What reverse stock split did C3IS INC. (CISS) announce?

C3is Inc. announced a one-for-forty (1-for-40) reverse stock split of its common stock. Each 40 existing shares will be combined into one share, affecting the share count but not the company’s overall market value by itself.

When does the C3IS INC. (CISS) reverse split become effective?

The reverse stock split becomes effective at 11:59 p.m. Eastern Time on August 18, 2026. After this effective time, shareholder positions will reflect the new, consolidated number of shares based on the 1-for-40 ratio.

When will C3IS INC. (CISS) begin trading on a split-adjusted basis?

C3is Inc.’s common stock will begin trading on a split-adjusted basis on August 19, 2026. Trading on The Nasdaq Capital Market that day will reflect the 1-for-40 reverse split-adjusted share count and price per share.

On which market will C3IS INC. (CISS) trade after the reverse split?

After the reverse split, C3is Inc.’s common stock will continue trading on The Nasdaq Capital Market. Trading will simply reflect the split-adjusted share price and quantity beginning with the market open on August 19, 2026.

How does the C3IS INC. (CISS) reverse split relate to its registration statements?

The company states this reverse split disclosure is incorporated by reference into its Form S-8 and Form F-3 registration statements. This connects the split-adjusted share structure to previously filed securities registration documents.

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

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Available on EDGAR 08/17/2026 - 04:06 PM Accepted by SEC EDGAR 08/17/2026 - 04:05 PM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2026

Commission File Number 001-41717

C3IS INC.

(Translation of registrant’s name into English)

331 Kifissias Avenue Kifissia 14561 Athens, Greece

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒   Form 40-F ☐

INFORMATION CONTAINED IN THIS FORM 6-K REPORT

Attached to this report on Form 6-K as Exhibit 99.1 is a copy of C3is Inc.’s (the “Company”) press release, dated August 17, 2026, announcing a one-for-forty (1-for-40) reverse stock split of the Company’s common stock, par value $0.01 per share, which will take effect at 11:59 pm Eastern Time on August 18, 2026. The Company’s common stock will begin trading on a split-adjusted basis on The Nasdaq Capital Market as of the opening of trading on August 19, 2026.

EXHIBIT INDEX

99.1 Press Release dated August 17, 2026

*****

This report on Form 6-K, including exhibit 99.1 hereto, is hereby incorporated by reference into the Company’s Registration Statement on Form S-8 (Reg. No. 333-273306) filed with the Securities and Exchange Commission on July 18, 2023 and Registration Statement on Form F-3 (Reg. No. 333-285135) filed with the Securities and Exchange Commission on February 21, 2025.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: August 17, 2026

C3IS INC.
By:		/s/ Nina Pyndiah
Name:		Nina Pyndiah
Title:		Chief Financial Officer

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 8.2 KB