Quantum Corp /DE/ SEC filings QMCO
Quantum Corp /DE/ has 1,000 filings in SEC EDGAR's recent list, going back to Jul 3, 2013. Its latest annual report, Form ARS, was filed on Jul 29, 2026 for the period ended Mar 31, 2026. The latest quarterly report (Form 10-Q) was filed on Aug 11, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 9, 2026 (officer or director change, other events). The company's fiscal year ends on March 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Officer or director change, Other events
|
Oct 9, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Sep 28, 2026 | Sep 28, 2026 |
| S-8 | Employee stock plan registration | Sep 25, 2026 | — |
| 8-K |
Current report
Shareholder vote results
|
Sep 17, 2026 | Sep 15, 2026 |
| 3 | Initial insider ownership | Sep 8, 2026 | Sep 1, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Sep 1, 2026 | Sep 1, 2026 |
| 8-K |
Current report
Officer or director change
|
Aug 14, 2026 | Aug 11, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2026 | — |
| 10-Q | Quarterly report | Aug 11, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2026 | Aug 10, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 10, 2026 | — |
| 4 | Insider transaction | Aug 5, 2026 | Aug 3, 2026 |
| ARS | Annual report to shareholders | Jul 29, 2026 | Mar 31, 2026 |
| DEFA14A | Additional proxy material | Jul 29, 2026 | — |
| DEF 14A | Proxy statement | Jul 29, 2026 | Sep 15, 2026 |
| 424B3 | Prospectus | Jul 27, 2026 | — |
| EFFECT | Filing | Jul 24, 2026 | — |
| S-1 | Registration statement | Jul 14, 2026 | — |
| 4 | Insider transaction | Jul 7, 2026 | Jul 2, 2026 |
| 4 | Insider transaction | Jul 7, 2026 | Jul 2, 2026 |
| 10-K | Annual report | Jun 25, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
Jun 25, 2026 | Jun 25, 2026 |
| NT 10-K | Filing | Jun 15, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Jun 8, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 8, 2026 | Jun 4, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jun 8, 2026 | — |
| 8-K |
Current report
Agreement ended, Other events
|
Jun 5, 2026 | Jun 4, 2026 |
| 8-K |
Current report
Material agreement, Results of operations, New debt, Unregistered share sale, Other events
|
Jun 2, 2026 | Jun 1, 2026 |
| SD | Specialized disclosure (conflict minerals) | May 29, 2026 | — |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 4, 2026 |
| 424B3 | Prospectus | Feb 24, 2026 | — |
| EFFECT | Filing | Feb 23, 2026 | — |
| CORRESP | Letter to the SEC | Feb 19, 2026 | — |
| UPLOAD | Letter from the SEC | Feb 19, 2026 | — |
| S-8 | Employee stock plan registration | Feb 19, 2026 | — |
| S-1 | Registration statement | Feb 19, 2026 | — |
| 10-Q | Quarterly report | Feb 17, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 17, 2026 | Feb 17, 2026 |
| 3 | Initial insider ownership | Feb 9, 2026 | Feb 2, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Feb 2, 2026 | Feb 2, 2026 |
| 8-K |
Current report
Results of operations
|
Jan 15, 2026 | Jan 15, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jan 12, 2026 | — |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Dec 29, 2025 | Sep 23, 2025 |
| 4 | Insider transaction | Dec 23, 2025 | Dec 18, 2025 |
| 3 | Initial insider ownership | Dec 23, 2025 | Dec 18, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 22, 2025 | — |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Shareholder vote results
|
Dec 18, 2025 | Dec 16, 2025 |
| DEFA14A | Additional proxy material | Dec 2, 2025 | — |
| 424B3 | Prospectus | Nov 24, 2025 | — |
| EFFECT | Filing | Nov 21, 2025 | — |
| CORRESP | Letter to the SEC | Nov 19, 2025 | — |
| S-1 | Registration statement | Nov 17, 2025 | — |
| 10-Q | Quarterly report | Nov 13, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2025 | Nov 13, 2025 |
| 4 | Insider transaction | Nov 4, 2025 | Nov 1, 2025 |
| 4 | Insider transaction | Nov 4, 2025 | Nov 1, 2025 |
| 4 | Insider transaction | Nov 4, 2025 | Nov 1, 2025 |
| ARS | Annual report to shareholders | Oct 31, 2025 | Mar 31, 2025 |
| DEFA14A | Additional proxy material | Oct 31, 2025 | — |
| DEF 14A | Proxy statement | Oct 31, 2025 | Dec 16, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2025 | Oct 28, 2025 |
| PRE 14A | Preliminary proxy statement | Oct 21, 2025 | Oct 21, 2025 |
| 8-K |
Current report
Other events
|
Oct 20, 2025 | Oct 20, 2025 |
| SCHEDULE 13D | Ownership over 5% (active) | Oct 10, 2025 | — |
| 8-K |
Current report
Auditor change
|
Oct 6, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 2, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 424B3 | Prospectus | Oct 1, 2025 | — |
| EFFECT | Filing | Sep 30, 2025 | — |
| POS AM | Filing | Sep 26, 2025 | — |
| 10-Q/A | Amended quarterly report | Sep 23, 2025 | Jun 30, 2025 |
| DEFA14A | Additional proxy material | Sep 23, 2025 | — |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Other events
|
Sep 23, 2025 | Sep 23, 2025 |
| 3 | Initial insider ownership | Sep 17, 2025 | Aug 27, 2025 |
| 3 | Initial insider ownership | Sep 17, 2025 | Aug 2, 2025 |
| 4 | Insider transaction | Sep 17, 2025 | Sep 12, 2025 |
| 8-K |
Current report
Other events
|
Sep 15, 2025 | Sep 12, 2025 |
| 10-Q | Quarterly report | Sep 11, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Sep 10, 2025 | Sep 10, 2025 |
| 8-K |
Current report
Officer or director change
|
Aug 28, 2025 | Aug 27, 2025 |
| 8-K |
Current report
Listing notice, Other events
|
Aug 26, 2025 | Aug 21, 2025 |
| 10-K | Annual report | Aug 26, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Agreement ended, Results of operations, Officer or director change, Other events
|
Aug 18, 2025 | Aug 12, 2025 |
| NT 10-Q | Filing | Aug 15, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Restatement
|
Aug 8, 2025 | Aug 8, 2025 |
| 8-K |
Current report
Listing notice, Other events
|
Jul 23, 2025 | Jul 17, 2025 |
| 3 | Initial insider ownership | Jul 14, 2025 | Jul 2, 2025 |
| 8-K |
Current report
Officer or director change
|
Jul 8, 2025 | Jul 1, 2025 |
| NT 10-K | Filing | Jun 30, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change
|
Jun 18, 2025 | Jun 12, 2025 |
| 8-K |
Current report
Results of operations, Officer or director change, Other events
|
Jun 3, 2025 | Jun 2, 2025 |
| SD | Specialized disclosure (conflict minerals) | May 28, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 8, 2025 | — |
| 8-K |
Current report
Results of operations
|
May 6, 2025 | May 6, 2025 |
| 4 | Insider transaction | May 5, 2025 | May 1, 2025 |
| 3 | Initial insider ownership | Apr 30, 2025 | Apr 3, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Apr 29, 2025 | Apr 24, 2025 |
| 424B3 | Prospectus | Apr 29, 2025 | — |
| EFFECT | Filing | Apr 28, 2025 | — |
| UPLOAD | Letter from the SEC | Apr 24, 2025 | — |
| CORRESP | Letter to the SEC | Apr 24, 2025 | — |
| 4 | Insider transaction | Apr 23, 2025 | Apr 21, 2025 |
| 4 | Insider transaction | Apr 23, 2025 | Apr 21, 2025 |
| 4 | Insider transaction | Apr 23, 2025 | Apr 21, 2025 |
| S-3 | Shelf registration | Apr 18, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Apr 17, 2025 | — |
| 4 | Insider transaction | Apr 17, 2025 | Apr 15, 2025 |
| 8-K |
Current report
Other events
|
Apr 17, 2025 | Apr 16, 2025 |
| 144 | Notice of proposed sale | Apr 15, 2025 | — |
| 3 | Initial insider ownership | Apr 14, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 4, 2025 | Apr 2, 2025 |
| 8-K |
Current report
Officer or director change, Other events
|
Apr 3, 2025 | Mar 28, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 31, 2025 | — |
| DEF 14A | Proxy statement | Mar 27, 2025 | Apr 24, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 21, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Mar 20, 2025 | Mar 19, 2025 |
| PRE 14A | Preliminary proxy statement | Mar 17, 2025 | Mar 17, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Feb 21, 2025 | — |
| 10-Q | Quarterly report | Feb 12, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 12, 2025 | Feb 12, 2025 |
| EFFECT | Filing | Feb 11, 2025 | — |
| 424B3 | Prospectus | Feb 11, 2025 | — |
| CORRESP | Letter to the SEC | Feb 7, 2025 | — |
| S-1/A | Amended registration statement | Feb 6, 2025 | — |
| 4 | Insider transaction | Feb 5, 2025 | Feb 3, 2025 |
| UPLOAD | Letter from the SEC | Feb 3, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 31, 2025 | — |
| S-1 | Registration statement | Jan 27, 2025 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Jan 27, 2025 | Jan 25, 2025 |
| 4 | Insider transaction | Jan 17, 2025 | Jan 16, 2025 |
| 4 | Insider transaction | Jan 17, 2025 | Jan 16, 2025 |
| 4 | Insider transaction | Jan 17, 2025 | Jan 16, 2025 |
| 4 | Insider transaction | Jan 17, 2025 | Nov 8, 2024 |
| 4/A | Filing | Jan 17, 2025 | Nov 8, 2024 |
| 4/A | Filing | Jan 17, 2025 | Nov 8, 2024 |
| 4/A | Filing | Jan 17, 2025 | Nov 8, 2024 |
| 4/A | Filing | Jan 17, 2025 | Nov 8, 2024 |
| 4/A | Filing | Jan 17, 2025 | Nov 8, 2024 |
| 4 | Insider transaction | Jan 7, 2025 | Jan 3, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jan 7, 2025 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Jan 6, 2025 | — |
| 4 | Insider transaction | Dec 5, 2024 | Nov 8, 2024 |
| 4 | Insider transaction | Dec 5, 2024 | Nov 8, 2024 |
| 4 | Insider transaction | Dec 5, 2024 | Nov 8, 2024 |
| 4 | Insider transaction | Dec 5, 2024 | Nov 8, 2024 |
| 4 | Insider transaction | Dec 5, 2024 | Nov 8, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Dec 4, 2024 | — |
| UPLOAD | Letter from the SEC | Nov 21, 2024 | — |
| 4/A | Form 4/a | Nov 19, 2024 | Oct 1, 2024 |
| 4/A | Form 4/a | Nov 19, 2024 | Oct 1, 2024 |
| 4/A | Form 4/a | Nov 19, 2024 | Oct 1, 2024 |
| 4/A | Form 4/a | Nov 19, 2024 | Oct 1, 2024 |
| 4/A | Form 4/a | Nov 19, 2024 | Oct 1, 2024 |
| 4/A | Form 4/a | Nov 19, 2024 | Oct 1, 2024 |
| 4/A | Form 4/a | Nov 19, 2024 | Oct 1, 2024 |
| 4/A | Form 4/a | Nov 19, 2024 | Oct 1, 2024 |
| CORRESP | Letter to the SEC | Nov 18, 2024 | — |
| 10-Q | Quarterly report | Nov 14, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2024 | Nov 13, 2024 |
| UPLOAD | Letter from the SEC | Nov 7, 2024 | — |
| 4 | Insider transaction | Nov 5, 2024 | Nov 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 1, 2024 |
| 8-K |
Current report
Listing notice
|
Oct 10, 2024 | Oct 4, 2024 |
| CORRESP | Letter to the SEC | Oct 3, 2024 | — |
| CORRESP | Letter to the SEC | Sep 26, 2024 | — |
| 8-K |
Current report
Other events
|
Sep 23, 2024 | Sep 17, 2024 |
| UPLOAD | Letter from the SEC | Sep 17, 2024 | — |
| S-8 | Employee stock plan registration | Sep 16, 2024 | — |
| 10-Q | Quarterly report | Sep 6, 2024 | Sep 30, 2023 |
| 10-Q | Quarterly report | Sep 6, 2024 | Dec 31, 2023 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Computer Storage Devices (SIC 3572)
- Listed as
- QMCO (Nasdaq)
- Fiscal year ends
- March 31
- Incorporated in
- DE
- Headquarters
- Centennial, CO
- SEC filer status
- Accelerated filer, Smaller reporting company
- SEC CIK
- 709283
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.