AMBC SCHEDULE 13G/A: SEC filing
An institutional holder
Filed with the SEC on · accession 0002100119-26-001635
AMBC filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Oct 30, 2026. An institutional holder filed an amended Schedule 13G for Octave Specialty Group Inc (OSG), indicating a change in passive ownership position.
Summary of the filing
An institutional holder filed an amended Schedule 13G for Octave Specialty Group Inc (OSG), indicating a change in passive ownership position. The filing text provided contains only EDGAR directory metadata and no substantive ownership details.
Key details
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What did AMBC file with the SEC on Oct 30, 2026?
AMBC filed a SCHEDULE 13G/A (SEC filing). An institutional holder filed an amended Schedule 13G for Octave Specialty Group Inc (OSG), indicating a change in passive ownership position. The filing text provided contains only EDGAR directory metadata and no substantive ownership details.
How do I read a SCHEDULE 13G/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 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).
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