As of November 10, 2026, Quantum Corp. is a publicly traded company (Nasdaq: QMCO). The largest holder reporting an active stake on Schedule 13D is Dialectic Technology SPV LLC, at 40%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include Alyeska (6.74%), Two Seas Capital LP (6.3%), Barclays (5.6%) (Schedule 13D/A, June 8, 2026).
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Is Quantum Corp. a real, registered company?
- Quantum Corp files with the SEC under CIK 709283 (its SEC filings).
- Its shares are listed under the ticker QMCO on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in Centennial, Colorado, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under QUANTUM CORP in our court records and SEC 8-K records (as of 2026-11-10).
- Leadership changes: the latest reported is William H. White, Chief Financial Officer and Principal Financial Officer (Form 8-K filed 2026-10-09). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Barclays (filed 2026-11-06).
Who are Quantum Corp.'s owners and officers?
Quantum Corp.: incorporated in Delaware; business address in Centennial, Colorado; industry Computer Storage Devices (Schedule 13G, 2026-11-06).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G, 2026-11-06 | Barclays PLC | 5.6% |
| Schedule 13G, 2026-08-14 | Two Seas Capital LP | 6.3% |
| Schedule 13G, 2026-08-14 | Alyeska Investment Group, L.P. | 6.74% |
| Schedule 13G, 2026-08-10 | Oaktree Capital Management LP | 5.11% |
| Schedule 13D/A, 2026-06-08 | Dialectic Technology Spv LLC | 40% |
| Schedule 13D/A, 2026-01-12 | Dialectic Technology Spv LLC | 41.4% |
| Schedule 13D/A, 2025-12-22 | Dialectic Technology Spv LLC | 37.3% |
| Schedule 13D, 2025-10-10 | Dialectic Technology Spv LLC | 16.7% |
Questions about who owns Quantum Corp.
Who owns Quantum Corp.?
On this page, 5 holders' latest ownership filings report 5% or more of Quantum Corp.: Dialectic Technology Spv LLC (40%, Schedule 13D/A, filed 2026-06-08), Alyeska Investment Group, L.P. (6.74%, Schedule 13G, filed 2026-08-14), Two Seas Capital LP (6.3%, Schedule 13G, filed 2026-08-14), Barclays PLC (5.6%, Schedule 13G, filed 2026-11-06) and Oaktree Capital Management LP (5.11%, Schedule 13G, filed 2026-08-10).
Who are the largest shareholders of Quantum Corp.?
By the share each holder's latest filing reports, the largest holders of Quantum Corp. on this page are Dialectic Technology Spv LLC (40%), Alyeska Investment Group, L.P. (6.74%) and Two Seas Capital LP (6.3%).
When did Dialectic Technology Spv LLC buy into Quantum Corp.?
The filings give report dates, not purchase dates. The earliest filing from Dialectic Technology Spv LLC on this page is the Schedule 13D, filed 2025-10-10, reporting 16.7%; its latest, Schedule 13D/A filed 2026-06-08, reports 40%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-10-09 | William H. White | Chief Financial Officer and Principal Financial Officer | departed | |
| Form 8-K, 2026-10-09 | Hiral A. Patel | Chief Accounting Officer and Principal Accounting Officer | appointed | 2026-10-09 |
Which insiders own Quantum Corp. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , a director and 10% owner: 14,145,516 shares (35.8% of shares outstanding), 40,896 held directly and 14,104,620 indirectly (Form 4, 2026-10-05).
- Dialectic Technology SPV LLC, a 10% owner: 14,104,620 shares (35.7% of shares outstanding) (Form 4, 2026-06-08).
- , the chief operating officer: 163,000 shares (0.41% of shares outstanding) (Form 4, 2026-10-05).
- , the chief executive and president: 118,468 shares (0.30% of shares outstanding) (Form 4, 2026-07-07).
- , the chief executive and president: 110,848 shares (0.28% of shares outstanding) (Form 4, 2025-04-23).
Shares outstanding: 39,557,393 as of 2026-11-05, from the company's latest SEC cover page.
How much has Quantum Corp. raised?
Latest IPO step: Quantum Corp. filed to go public (S-1, 2026-07-14).
IPO filings: S-1, 2026-07-14, S-1, 2026-02-19, S-1, 2025-11-17, S-1/A, 2025-02-06, S-1, 2025-01-27; ticker QMCO on Nasdaq Global Market.
Keep reading
More on Quantum Corp. and the records around it.
Quantum Corp. elsewhere on the record
- 5%+ stake filings Nov 2026
- Leadership changes Sep 2026
Companies that share a holder
- Oaktree Capital Management LP also filed stake reports on 3 other companies: MATTHEWS INTERNATIONAL CORPORATION (Oct 2026), SharonAI Holdings Inc. (Aug 2026), Rice Acquisition Corp 3 (Feb 2026)
- Two Seas Capital LP also filed stake reports on 14 other companies: NEKTAR THERAPEUTICS (Sep 2026), Calumet, Inc. (Aug 2026), Sable Offshore Corp. (Aug 2026)
- Alyeska Investment Group, L.P. also filed stake reports on 81 other companies: ABUNDIA GLOBAL IMPACT GROUP, INC. (Aug 2026), Bakkt, Inc. (Aug 2026), BATTALION OIL CORP (Aug 2026)
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