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CISS 424B3: SEC filing

C3is Inc.

Filed with the SEC on · accession 0001193125-26-369639

CISS filed a 424B3 (prospectus (offering)) with the SEC on Aug 27, 2026. The final terms of an offering of shares or bonds. The stock moved -27.3% by the first close after the filing.

Summary of the filing

C3is Inc. filed a prospectus supplement to update its registration statement with unaudited financial results for Q2 and six months ended June 30, 2026, reporting operational highlights including charter rates and vessel acquisitions.

For details, click here →How to read a 424B3 →

Key details

Gross proceeds from ATM issuance$2.6M
Aggregate consideration for acquisition of two product tankers$39.8M
FilerC3is Inc.
Chief financial officerNina Pyndiah

How CISS stock reacted

Close before

$2.93

Aug 26, 2026

First close after

-27.30%

$2.13

5 trading days

-52.22%

$1.40

Since filing

-86.94%

$0.38

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Frequently asked questions

What did CISS file with the SEC on Aug 27, 2026?

CISS filed a 424B3 (SEC filing). C3is Inc. filed a prospectus supplement to update its registration statement with unaudited financial results for Q2 and six months ended June 30, 2026, reporting operational highlights including charter rates and vessel acquisitions.

How do I read a 424B3?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B3 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did CISS stock react to this filing?

CISS closed at $2.93 before the filing and $2.13 on Aug 27, 2026 (-27.30%). Five trading days later: $1.40 (-52.22%).

Other CISS SEC filings

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