Company filings profile · CIK 0000709283
QUANTUM CORP /DE/ — SEC filings & insider activity.
Real, source-linked SEC EDGAR activity for QUANTUM CORP /DE/ (QMCO): 20 filings in the last 90 days vs 10 in the prior 90 (filing-velocity rising ↑ · 2×). Latest material 8-K events, insider Form-4 transactions, and periodic reports — monitored for change.
✔ Verified against the public SEC EDGAR filing record as of Sep 19, 2026. Source-linked, daily-refreshed.
Material 8-K events — QUANTUM CORP /DE/
8-K disclosures decoded by item code (the material events: agreements, results, control/management changes, impairments, restatements).
| Filed | Event | |
|---|---|---|
| Sep 17, 2026 | Item 5.07 | ↗ |
| Sep 1, 2026 | Departure/Election of Directors or Officers; Other Events; Financial Statements and Exhibits | ↗ |
| Aug 14, 2026 | Departure/Election of Directors or Officers | ↗ |
| Aug 10, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Jun 25, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Jun 5, 2026 | Termination of a Material Agreement; Item 5.08; Other Events | ↗ |
| Jun 2, 2026 | Entry into a Material Agreement; Results of Operations (earnings); Material Direct Financial Obligation; Unregistered Sale of Securities; Other Events; Financial Statements and Exhibits | ↗ |
| Feb 17, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
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Insider transactions (Form 4 / 3 / 5)
Recent filings
| Filed | Form | Detail | |
|---|---|---|---|
| Sep 17, 2026 | 8-K | Item 5.07 | ↗ |
| Sep 8, 2026 | 3 | FORM 3 | ↗ |
| Sep 1, 2026 | 8-K | Departure/Election of Directors or Officers; Other Events; Financial Statements and Exhibits | ↗ |
| Aug 14, 2026 | 8-K | Departure/Election of Directors or Officers | ↗ |
| Aug 14, 2026 | SCHEDULE 13G | ↗ | |
| Aug 14, 2026 | SCHEDULE 13G | ↗ | |
| Aug 11, 2026 | 10-Q | 10-Q | ↗ |
| Aug 10, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Aug 10, 2026 | SCHEDULE 13G | ↗ | |
| Aug 5, 2026 | 4 | FORM 4 | ↗ |
| Jul 29, 2026 | ARS | ARS | ↗ |
| Jul 29, 2026 | DEFA14A | DEFA14A | ↗ |
| Jul 29, 2026 | DEF 14A | DEF 14A | ↗ |
| Jul 27, 2026 | 424B3 | 424B3 | ↗ |
| Jul 24, 2026 | EFFECT | Item ; Item ; Item | ↗ |
| Jul 14, 2026 | S-1 | S-1 | ↗ |
| Jul 7, 2026 | 4 | FORM 4 | ↗ |
| Jul 7, 2026 | 4 | FORM 4 | ↗ |
| Jun 25, 2026 | 10-K | 10-K | ↗ |
| Jun 25, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Jun 15, 2026 | NT 10-K | NT 10-K | ↗ |
| Jun 8, 2026 | 4 | FORM 4 | ↗ |
| Jun 8, 2026 | 4 | FORM 4 | ↗ |
| Jun 8, 2026 | SCHEDULE 13D/A | ↗ | |
| Jun 5, 2026 | 8-K | Termination of a Material Agreement; Item 5.08; Other Events | ↗ |
| Jun 2, 2026 | 8-K | Entry into a Material Agreement; Results of Operations (earnings); Material Direct Financial Obligation; Unregistered Sale of Securities; Other Events; Financial Statements and Exhibits | ↗ |
| May 29, 2026 | SD | SD | ↗ |
| Apr 3, 2026 | 4 | FORM 4 | ↗ |
| Apr 3, 2026 | 4 | 4 | ↗ |
| Apr 3, 2026 | 4 | 4 | ↗ |
| Mar 4, 2026 | 4 | FORM 4 | ↗ |
| Feb 24, 2026 | 424B3 | 424B3 | ↗ |
| Feb 23, 2026 | EFFECT | Item ; Item ; Item | ↗ |
| Feb 19, 2026 | CORRESP | ↗ | |
| Feb 19, 2026 | UPLOAD | ↗ | |
| Feb 19, 2026 | S-8 | S-8 | ↗ |
| Feb 19, 2026 | S-1 | S-1 | ↗ |
| Feb 17, 2026 | 10-Q | 10-Q | ↗ |
| Feb 17, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Feb 9, 2026 | 3 | FORM 3 | ↗ |