C3is Inc. filed a Form 6-K with the SEC on November 5, 2026, announcing a one-for-five reverse stock split of its common stock set to take effect at 11:59 pm Eastern Time on November 8, 2026.

Key Highlights

  • Reverse split ratio: One-for-five (1-for-5) reverse stock split of the company's common stock, par value $0.01 per share.
  • Effective time: 11:59 pm Eastern Time on November 8, 2026, according to the filing.
  • Trading adjustment date: Common stock will begin trading on a split-adjusted basis on The Nasdaq Capital Market as of the opening of trading on November 9, 2026.
  • Exchange listing: The company's common stock trades on The Nasdaq Capital Market (NASDAQ:CISS).
  • Signing officer: The report was signed by Nina Pyndiah, Chief Financial Officer of C3is Inc.

C3is Inc. 1-for-5 Reverse Stock Split Details and Timing

According to the Form 6-K filed on November 5, 2026, C3is Inc. disclosed a one-for-five (1-for-5) reverse stock split of its common stock, which carries a par value of $0.01 per share. The company disclosed that the reverse stock split will take effect at 11:59 pm Eastern Time on November 8, 2026.

The filing states that 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 November 9, 2026. The announcement was made via a press release dated November 5, 2026, attached to the Form 6-K as Exhibit 99.1.

The filing further notes that the Form 6-K, including Exhibit 99.1, is incorporated by reference into the company's Registration Statement on Form S-8 (Reg. No. 333-273306), filed with the SEC on July 18, 2023, and its Registration Statement on Form F-3 (Reg. No. 333-285135), filed with the SEC on February 21, 2025. The report was signed by Chief Financial Officer Nina Pyndiah on behalf of C3is Inc.

What Was Disclosed

C3is Inc. reported a 1-for-5 reverse stock split of its $0.01 par value common stock, effective 11:59 pm Eastern Time on November 8, 2026, with split-adjusted trading on The Nasdaq Capital Market beginning November 9, 2026.