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QMCO SCHEDULE 13G: SEC filing

Alyeska Investment Group, L.P. and affiliated reporting persons

Filed with the SEC on · accession 0001172661-26-003795

QMCO filed a SCHEDULE 13G (schedule 13g) with the SEC on Aug 14, 2026. Alyeska Investment Group, L.P. and affiliated reporting persons filed a Schedule 13G disclosing beneficial ownership of 2,653,928 shares (6.74%) of Quantum Corp common stock, acquired via a private placement. The stock moved +5.8% by the first close after the filing.

Summary of the filing

Alyeska Investment Group, L.P. and affiliated reporting persons filed a Schedule 13G disclosing beneficial ownership of 2,653,928 shares (6.74%) of Quantum Corp common stock, acquired via a private placement. The filing is passive (Rule 13d-1(b)) with no intent to influence control.

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Key details

Shares beneficially owned$2.7M
Percent of class owned$7
Shares outstanding$39.4M
IssuerQuantum Corporation
Reporting person / investment managerAlyeska Investment Group, L.P.
Reporting personAlyeska Fund GP, LLC
Holder of the sharesAlyeska Master Fund, L.P.
Chief executive officer of alyeska investment group, l.p.Anand Parekh
Chief financial officer of alyeska investment group, l.p. and alyeska fund gp, llcJason Bragg

How QMCO stock reacted

Close before

$24.68

Aug 13, 2026

First close after

+5.79%

$26.11

5 trading days

-17.06%

$20.47

Since filing

-41.37%

$14.47

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Frequently asked questions

What did QMCO file with the SEC on Aug 14, 2026?

QMCO filed a SCHEDULE 13G (SEC filing). Alyeska Investment Group, L.P. and affiliated reporting persons filed a Schedule 13G disclosing beneficial ownership of 2,653,928 shares (6.74%) of Quantum Corp common stock, acquired via a private placement. The filing is passive (Rule 13d-1(b)) with no intent to influence control.

How do I read a SCHEDULE 13G?

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 (schedule 13g): A report the company filed with the SEC (the US market regulator).

How did QMCO stock react to this filing?

QMCO closed at $24.68 before the filing and $26.11 on Aug 14, 2026 (+5.79%). Five trading days later: $20.47 (-17.06%).

Other QMCO SEC filings

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