HQ SCHEDULE 13D/A: SEC filing
Horizon Quantum Holdings Ltd.
Filed with the SEC on · accession 0001213900-26-116500
HQ filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Nov 5, 2026. Horizon Quantum Holdings Ltd. filed an amended Schedule 13D, indicating a change in a previously reported beneficial ownership position by an activist or large shareholder. The stock moved -18.5% by the first close after the filing.
Summary of the filing
Horizon Quantum Holdings Ltd. filed an amended Schedule 13D, indicating a change in a previously reported beneficial ownership position by an activist or large shareholder. The filing text provided contains only the EDGAR directory listing and no substantive details of the amendment.
Key details
How HQ stock reacted
Close before
$12.88
Nov 4, 2026
First close after
-18.48%
$10.50
5 trading days
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Since filing
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Click hereFrequently asked questions
What did HQ file with the SEC on Nov 5, 2026?
HQ filed a SCHEDULE 13D/A (SEC filing). Horizon Quantum Holdings Ltd. filed an amended Schedule 13D, indicating a change in a previously reported beneficial ownership position by an activist or large shareholder. The filing text provided contains only the EDGAR directory listing and no substantive details 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 HQ stock react to this filing?
HQ closed at $12.88 before the filing and $10.50 on Nov 5, 2026 (-18.48%).
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