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 |
|---|---|---|---|
| 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 |
| 3 | Initial insider ownership | Sep 8, 2026 | Sep 1, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 10, 2026 | — |
| 4 | Insider transaction | Aug 5, 2026 | Aug 3, 2026 |
| 4 | Insider transaction | Jul 7, 2026 | Jul 2, 2026 |
| 4 | Insider transaction | Jul 7, 2026 | Jul 2, 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 | — |
| 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 |
| 3 | Initial insider ownership | Feb 9, 2026 | Feb 2, 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 | — |
| 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 |
| SCHEDULE 13D | Ownership over 5% (active) | Oct 10, 2025 | — |
| 4 | Insider transaction | Oct 3, 2025 | Oct 2, 2025 |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 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 |
| 3 | Initial insider ownership | Jul 14, 2025 | Jul 2, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 8, 2025 | — |
| 4 | Insider transaction | May 5, 2025 | May 1, 2025 |
| 3 | Initial insider ownership | Apr 30, 2025 | Apr 3, 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 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Apr 17, 2025 | — |
| 4 | Insider transaction | Apr 17, 2025 | Apr 15, 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 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 31, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 21, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Feb 21, 2025 | — |
| 4 | Insider transaction | Feb 5, 2025 | Feb 3, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 31, 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 | — |
| 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 |
| 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 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 15, 2024 | — |
| 4 | Insider transaction | Aug 15, 2024 | Aug 13, 2024 |
| 4 | Insider transaction | Jul 15, 2024 | Jul 11, 2024 |
| 3 | Initial insider ownership | Jul 8, 2024 | Jun 28, 2024 |
| 3 | Initial insider ownership | Jun 17, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | May 29, 2024 | May 24, 2024 |
| 4 | Insider transaction | Apr 23, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Apr 23, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Apr 23, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Apr 23, 2024 | Jan 1, 2024 |
| 3 | Initial insider ownership | Apr 12, 2024 | Nov 9, 2023 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 17, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Dec 4, 2023 | — |
| 4 | Insider transaction | Nov 3, 2023 | Nov 2, 2023 |
| 144 | Notice of proposed sale | Nov 3, 2023 | — |
| 4 | Insider transaction | Oct 12, 2023 | Oct 10, 2023 |
| 144 | Notice of proposed sale | Oct 11, 2023 | — |
| 4 | Insider transaction | Oct 6, 2023 | Oct 4, 2023 |
| 4 | Insider transaction | Oct 6, 2023 | Oct 4, 2023 |
| 144 | Notice of proposed sale | Oct 6, 2023 | — |
| 144 | Notice of proposed sale | Oct 6, 2023 | — |
| 4 | Insider transaction | Sep 6, 2023 | Sep 5, 2023 |
| 144 | Notice of proposed sale | Sep 6, 2023 | — |
| 4 | Insider transaction | Sep 5, 2023 | Sep 1, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Jul 14, 2023 | — |
| 144 | Notice of proposed sale | Jul 12, 2023 | — |
| 144 | Notice of proposed sale | Jul 12, 2023 | — |
| 4 | Insider transaction | Jul 12, 2023 | Jul 10, 2023 |
| 4 | Insider transaction | Jul 12, 2023 | Jul 10, 2023 |
| 4 | Insider transaction | Jul 12, 2023 | Jul 10, 2023 |
| 4 | Insider transaction | Jul 12, 2023 | Jul 10, 2023 |
| 144 | Notice of proposed sale | Jul 12, 2023 | — |
| 144 | Notice of proposed sale | Jul 12, 2023 | — |
| 4 | Insider transaction | Jul 5, 2023 | Jul 1, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Jun 14, 2023 | — |
| 3 | Initial insider ownership | Jun 13, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 9, 2023 | Jun 1, 2023 |
| SC 13G | Ownership over 5% (passive) | May 11, 2023 | — |
| 144 | Notice of proposed sale | May 4, 2023 | — |
| 4 | Insider transaction | May 4, 2023 | May 2, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| 4 | Insider transaction | Feb 3, 2023 | Feb 1, 2023 |
| 3 | Initial insider ownership | Jan 18, 2023 | Jan 12, 2023 |
| 4 | Insider transaction | Nov 28, 2022 | Nov 9, 2022 |
| 3 | Initial insider ownership | Nov 28, 2022 | Nov 9, 2022 |
| 4 | Insider transaction | Nov 17, 2022 | Nov 9, 2022 |
| 3 | Initial insider ownership | Nov 17, 2022 | Nov 9, 2022 |
| 4 | Insider transaction | Nov 3, 2022 | Nov 2, 2022 |
| 4 | Insider transaction | Nov 2, 2022 | Nov 1, 2022 |
| 4 | Insider transaction | Oct 12, 2022 | Oct 11, 2022 |
| 4 | Insider transaction | Oct 12, 2022 | Oct 11, 2022 |
| 4 | Insider transaction | Oct 7, 2022 | Oct 5, 2022 |
| 4 | Insider transaction | Oct 7, 2022 | Oct 5, 2022 |
| 4 | Insider transaction | Sep 12, 2022 | Sep 9, 2022 |
| 4 | Insider transaction | Sep 12, 2022 | Sep 9, 2022 |
| 4 | Insider transaction | Sep 12, 2022 | Sep 9, 2022 |
| 4 | Insider transaction | Sep 7, 2022 | Sep 6, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 3 | Initial insider ownership | Aug 29, 2022 | Aug 16, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 24, 2022 | — |
| SC 13D/A | Amended ownership over 5% (active) | Aug 12, 2022 | — |
| SC 13D/A | Amended ownership over 5% (active) | Aug 8, 2022 | — |
| 4 | Insider transaction | Jul 25, 2022 | Jul 21, 2022 |
| 4 | Insider transaction | Jul 19, 2022 | Jul 15, 2022 |
| 4 | Insider transaction | Jul 12, 2022 | Jul 8, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 8, 2022 | — |
| 4/A | Form 4/a | Jul 8, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jul 6, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jul 6, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jul 6, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jul 6, 2022 | Jul 1, 2022 |
| 4 | Insider transaction | Jul 6, 2022 | Jul 1, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Jun 10, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | May 20, 2022 | — |
| 4/A | Form 4/a | May 17, 2022 | Apr 22, 2022 |
| 4 | Insider transaction | May 9, 2022 | May 5, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Apr 28, 2022 | — |
| 4 | Insider transaction | Apr 26, 2022 | Apr 22, 2022 |
| 4 | Insider transaction | Apr 26, 2022 | Apr 22, 2022 |
| 4 | Insider transaction | Apr 26, 2022 | Apr 22, 2022 |
| 4 | Insider transaction | Apr 26, 2022 | Apr 22, 2022 |
| 4 | Insider transaction | Apr 26, 2022 | Apr 22, 2022 |
| 4 | Insider transaction | Apr 26, 2022 | Apr 22, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Apr 26, 2022 | — |
| 3 | Initial insider ownership | Apr 25, 2022 | Apr 22, 2022 |
| SC 13D | Ownership over 5% (active) | Mar 28, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Mar 11, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Feb 8, 2022 | — |
| 4 | Insider transaction | Jan 10, 2022 | Jan 7, 2022 |
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.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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
Other Computer Storage Devices companies
- Sandisk Corp SNDK
- Seagate Technology Holdings plc STX
- Western Digital Corp WDC
- Everpure, Inc. P
- NetApp, Inc. NTAP
Source: SEC EDGAR filings. This is company-reported data, not investment advice.