QMCO SCHEDULE 13G/A: SEC filing

Oaktree Capital Management

Filed with the SEC on Nov 13, 2026 · accession 0001140361-26-043863

QMCO filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 13, 2026. A report the company filed with the SEC (the US market regulator). The stock moved -7.8% by the first close after the filing.

Summary of the filing

Oaktree Capital Management filed an amended Schedule 13G reporting beneficial ownership of 901,793 shares of Quantum Corp common stock, representing 2.29% of outstanding shares, as of September 30, 2026.

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Key details

Shares beneficially owned$902K

Percentage of class beneficially owned$2

Shares outstanding as of August 6, 2026$39.4M

Reporting person / beneficial ownerOaktree Capital Management, L.P.

IssuerQuantum Corporation

Managing director, oaktree capital management, l.p.Henry Orren

How QMCO stock reacted

Close before

$16.63

Nov 12, 2026

First close after

-7.76%

$15.34

5 trading days

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Since filing

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Frequently asked questions

What did QMCO file with the SEC on Nov 13, 2026?

QMCO filed a SCHEDULE 13G/A (SEC filing). Oaktree Capital Management filed an amended Schedule 13G reporting beneficial ownership of 901,793 shares of Quantum Corp common stock, representing 2.29% of outstanding shares, as of September 30, 2026.

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).

How did QMCO stock react to this filing?

QMCO closed at $16.63 before the filing and $15.34 on Nov 13, 2026 (-7.76%).

Other QMCO SEC filings

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