CISS SCHEDULE 13D/A: SEC filing
An amendment to a Schedule 13D was
Filed with the SEC on · accession 0001193125-26-374929
CISS filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Aug 28, 2026. A report the company filed with the SEC (the US market regulator). The stock moved -15.0% by the first close after the filing.
Summary of the filing
An amendment to a Schedule 13D was filed for C3is Inc. (CISS), but the filing text provided contains only the EDGAR directory listing and no substantive details about the reporting person, ownership change, or purpose of the amendment.
Key details
How CISS stock reacted
Close before
$2.13
Aug 27, 2026
First close after
-15.02%
$1.81
5 trading days
-35.21%
$1.38
Since filing
-79.75%
$0.43
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Click hereFrequently asked questions
What did CISS file with the SEC on Aug 28, 2026?
CISS filed a SCHEDULE 13D/A (SEC filing). An amendment to a Schedule 13D was filed for C3is Inc. (CISS), but the filing text provided contains only the EDGAR directory listing and no substantive details about the reporting person, ownership change, or purpose of the amendment.
How do I read a SCHEDULE 13D/A?
A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.
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 SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).
How did CISS stock react to this filing?
CISS closed at $2.13 before the filing and $1.81 on Aug 28, 2026 (-15.02%). Five trading days later: $1.38 (-35.21%).
Other CISS SEC filings
- SCHEDULE 13G/A · SEC filingNov 6, 2026
- 6-K · Stock splitNov 5, 2026
- 424B3 · Stock splitNov 5, 2026
- 424B3 · Stock splitNov 5, 2026
- 424B3 · Stock splitNov 5, 2026
- EFFECT · Shelf registrationOct 16, 2026
- EFFECT · Shelf registrationOct 16, 2026
- EFFECT · Shelf registrationOct 16, 2026
- SCHEDULE 13G/A · SEC filingOct 5, 2026
- SCHEDULE 13G/A · SEC filingOct 5, 2026
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