Quantum CorporationSEC Filings
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All SEC filings by Quantum Corporation (QMCO) — annual and quarterly reports, current reports, registrations, proxies and ownership forms, updated in real time.
Financials
| 10-Q | Quarterly report | View Diff | Aug 10, 2026 | |
| ARS | Annual report to shareholders | Jul 29, 2026 | ||
| 10-K | Annual report | View Diff | Jun 25, 2026 | |
| NT 10-K | Notice of late annual filing | Jun 15, 2026 | ||
| 10-Q | Quarterly report | View Diff | Feb 17, 2026 | |
| 10-Q | Quarterly report | View Diff | Nov 13, 2025 | |
| ARS | Annual report to shareholders | Oct 31, 2025 | ||
| 10-Q/A | Quarterly report | View Diff | Sep 23, 2025 | |
| 10-Q | Quarterly report | View Diff | Sep 11, 2025 | |
| 10-K | Annual report | View Diff | Aug 26, 2025 |
Events
| 8-K | Quantum Appoints Hiral A. Patel as Chief Accounting Officer | Sep 1, 2026 | ||
| 8-K | Current report | Aug 14, 2026 | ||
| 8-K | Quantum Reports Fiscal First Quarter 2027 Financial Results | Aug 10, 2026 | ||
| 8-K | Current report | Jun 25, 2026 | ||
| 8-K | Current report | Jun 5, 2026 | ||
| 8-K | Current report | Jun 2, 2026 | ||
| 8-K | Quantum Reports Fiscal Third Quarter 2026 Financial Results | Feb 17, 2026 | ||
| 8-K | Quantum Appoints William H. White as Chief Financial Officer | Feb 2, 2026 | ||
| 8-K | Quantum Announces Preliminary Fiscal Third Quarter 2026 Financial Results | Jan 15, 2026 | ||
| 8-K | Entry Into a Material Definitive Agreement | Dec 18, 2025 |
Registrations and Prospectuses
| 424B3 | Prospectus supplement | Jul 27, 2026 | ||
| S-1 | IPO registration | View Diff | Jul 13, 2026 | |
| 424B3 | Prospectus supplement | Feb 24, 2026 | ||
| S-8 | Registration of securities for employees | Feb 18, 2026 | ||
| S-1 | IPO registration | View Diff | Feb 18, 2026 | |
| 424B3 | Prospectus supplement | Nov 24, 2025 | ||
| S-1 | IPO registration | View Diff | Nov 14, 2025 | |
| 424B3 | Prospectus supplement | Oct 1, 2025 | ||
| POS AM | Prospectus update (post-effective amendment) | Sep 26, 2025 | ||
| 424B3 | Prospectus supplement | Apr 29, 2025 |
Proxies
| DEFA14A | Additional proxy soliciting materials | Jul 29, 2026 | ||
| DEF 14A | Definitive proxy | View Diff | Jul 29, 2026 | |
| DEFA14A | Additional proxy soliciting materials | Dec 2, 2025 | ||
| DEFA14A | Additional proxy soliciting materials | Oct 31, 2025 | ||
| DEF 14A | Definitive proxy | View Diff | Oct 31, 2025 | |
| PRE 14A | Preliminary proxy | View Diff | Oct 21, 2025 | |
| DEFA14A | Additional proxy soliciting materials | Sep 23, 2025 | ||
| DEF 14A | Definitive proxy | View Diff | Mar 27, 2025 | |
| PRE 14A | Preliminary proxy | View Diff | Mar 17, 2025 | |
| DEFA14A | Additional proxy soliciting materials | Aug 2, 2024 |
Other
| EFFECT | Notice of effectiveness | Jul 27, 2026 | ||
| SD | Conflict minerals disclosure | May 29, 2026 | ||
| EFFECT | Notice of effectiveness | Feb 24, 2026 | ||
| EFFECT | Notice of effectiveness | Nov 24, 2025 | ||
| EFFECT | Notice of effectiveness | Oct 1, 2025 | ||
| SD | Conflict minerals disclosure | May 28, 2025 | ||
| EFFECT | Notice of effectiveness | Apr 29, 2025 | ||
| UPLOAD | Letter from SEC | Apr 24, 2025 | ||
| CORRESP | Correspondence with SEC | Apr 24, 2025 | ||
| EFFECT | Notice of effectiveness | Feb 12, 2025 |
Ownership
| SC 13G | Beneficial ownership report | Aug 14, 2026 | ||
| SC 13G | Beneficial ownership report | Aug 14, 2026 | ||
| SC 13G | Beneficial ownership report | Aug 10, 2026 | ||
| 4 | Craythorne Anthony | Aug 5, 2026 | ||
| 4 | Nash Laura A. | Jul 7, 2026 | ||
| 4 | Meyrath Hugues | Jul 7, 2026 | ||
| 4 | Fichthorn John | Jun 8, 2026 | ||
| 4 | Dialectic Technology Spv Llc | Jun 8, 2026 | ||
| SC 13D/A | Beneficial ownership report | Jun 8, 2026 | ||
| 4 | Laura A. Nash | Apr 3, 2026 |