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 |
| 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 |
| 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 |
| 10-Q | Quarterly report | Aug 11, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2026 | Aug 10, 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 | — |
| 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 |
| 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 | — |
| 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 |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Auditor change
|
Oct 6, 2025 | Sep 30, 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 |
| 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 |
| 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 | — |
| 8-K |
Current report
Results of operations
|
May 6, 2025 | May 6, 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 | — |
| S-3 | Shelf registration | Apr 18, 2025 | — |
| 8-K |
Current report
Other events
|
Apr 17, 2025 | Apr 16, 2025 |
| 8-K |
Current report
Officer or director change, Other events
|
Apr 3, 2025 | Mar 28, 2025 |
| DEF 14A | Proxy statement | Mar 27, 2025 | Apr 24, 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 |
| 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 | — |
| UPLOAD | Letter from the SEC | Feb 3, 2025 | — |
| S-1 | Registration statement | Jan 27, 2025 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Jan 27, 2025 | Jan 25, 2025 |
| UPLOAD | Letter from the SEC | Nov 21, 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 | — |
| 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 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Aug 20, 2024 | Aug 15, 2024 |
| 10-Q | Quarterly report | Aug 14, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Material agreement, Officer or director change
|
Aug 14, 2024 | Aug 13, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2024 | Aug 13, 2024 |
| DEFA14A | Additional proxy material | Aug 2, 2024 | — |
| 8-K |
Current report
Material agreement
|
Jul 12, 2024 | Jul 11, 2024 |
| ARS | Annual report to shareholders | Jul 2, 2024 | Mar 31, 2024 |
| DEFA14A | Additional proxy material | Jul 2, 2024 | — |
| DEF 14A | Proxy statement | Jul 2, 2024 | Aug 15, 2024 |
| 10-K | Annual report | Jun 28, 2024 | Mar 31, 2024 |
| PRE 14A | Preliminary proxy statement | Jun 18, 2024 | Aug 15, 2024 |
| 8-K |
Current report
Officer or director change
|
Jun 18, 2024 | Jun 12, 2024 |
| 8-K |
Current report
Results of operations
|
Jun 17, 2024 | Jun 17, 2024 |
| 8-K |
Current report
Officer or director change, Other events
|
Jun 10, 2024 | Jun 6, 2024 |
| SD | Specialized disclosure (conflict minerals) | May 30, 2024 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Restatement
|
May 29, 2024 | May 22, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
May 3, 2024 | May 3, 2024 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Apr 12, 2024 | Apr 8, 2024 |
| 8-K |
Current report
Material agreement, Listing notice
|
Mar 25, 2024 | Mar 19, 2024 |
| 8-K |
Current report
Material agreement
|
Feb 20, 2024 | Feb 14, 2024 |
| 8-K |
Current report
Listing notice
|
Feb 14, 2024 | Feb 13, 2024 |
| NT 10-Q | Filing | Feb 14, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Listing notice, Other events
|
Nov 17, 2023 | Nov 14, 2023 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Nov 16, 2023 | Nov 9, 2023 |
| 8-K |
Current report
Material agreement, Results of operations
|
Nov 13, 2023 | Nov 10, 2023 |
| NT 10-Q | Filing | Nov 13, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Listing notice
|
Sep 26, 2023 | Sep 20, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Sep 14, 2023 | Sep 12, 2023 |
| DEFA14A | Additional proxy material | Aug 21, 2023 | — |
| 8-K |
Current report
Auditor change
|
Aug 21, 2023 | Aug 21, 2023 |
| 10-Q | Quarterly report | Aug 8, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2023 | Aug 8, 2023 |
| ARS | Annual report to shareholders | Jul 27, 2023 | Mar 31, 2023 |
| DEFA14A | Additional proxy material | Jul 27, 2023 | — |
| DEF 14A | Proxy statement | Jul 27, 2023 | Sep 12, 2023 |
| 8-K |
Current report
Auditor change
|
Jul 27, 2023 | Jul 21, 2023 |
| S-8 POS | Filing | Jun 6, 2023 | — |
| 10-K | Annual report | Jun 6, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Material agreement, Results of operations, Exit or restructuring costs, Unregistered share sale, Officer or director change
|
Jun 6, 2023 | May 31, 2023 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2023 | — |
| 10-Q | Quarterly report | Feb 2, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 2, 2023 | Feb 2, 2023 |
| S-8 | Employee stock plan registration | Jan 27, 2023 | — |
| 424B3 | Prospectus | Jan 17, 2023 | — |
| EFFECT | Filing | Jan 13, 2023 | — |
| CORRESP | Letter to the SEC | Jan 11, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Jan 11, 2023 | Jan 10, 2023 |
| UPLOAD | Letter from the SEC | Jan 11, 2023 | — |
| S-3 | Shelf registration | Dec 29, 2022 | — |
| RW | Filing | Dec 29, 2022 | — |
| S-3ASR | Automatic shelf registration | Dec 27, 2022 | — |
| 10-Q | Quarterly report | Nov 2, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2022 | Nov 2, 2022 |
| 8-K |
Current report
Officer or director change
|
Sep 28, 2022 | Sep 22, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Aug 22, 2022 | Aug 16, 2022 |
| 10-Q | Quarterly report | Aug 4, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2022 | Aug 4, 2022 |
| DEFA14A | Additional proxy material | Jul 5, 2022 | — |
| DEF 14A | Proxy statement | Jul 5, 2022 | Mar 31, 2022 |
| PRE 14A | Preliminary proxy statement | Jun 16, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Officer or director change
|
Jun 16, 2022 | Jun 16, 2022 |
| 10-K | Annual report | Jun 8, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
Jun 8, 2022 | Jun 8, 2022 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2022 | — |
| 8-K | Current report | May 18, 2022 | May 18, 2022 |
| 8-K |
Current report
Material agreement, Other events
|
Apr 27, 2022 | Apr 22, 2022 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 11, 2022 | Apr 11, 2022 |
| 424B5 | Prospectus supplement | Mar 29, 2022 | — |
| 8-K |
Current report
Other events
|
Mar 29, 2022 | Mar 29, 2022 |
| 8-K |
Current report
Material agreement, Other events
|
Mar 17, 2022 | Mar 15, 2022 |
| 10-Q | Quarterly report | Feb 9, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 9, 2022 | Feb 9, 2022 |
| 424B3 | Prospectus | Dec 30, 2021 | — |
| EFFECT | Filing | Dec 29, 2021 | — |
| CORRESP | Letter to the SEC | Dec 27, 2021 | — |
| UPLOAD | Letter from the SEC | Dec 27, 2021 | — |
| S-3 | Shelf registration | Dec 17, 2021 | — |
| 10-Q | Quarterly report | Nov 3, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2021 | Nov 3, 2021 |
| 8-K |
Current report
Material agreement
|
Oct 6, 2021 | Sep 30, 2021 |
| S-8 | Employee stock plan registration | Sep 30, 2021 | — |
| 8-K |
Current report
Shareholder vote results
|
Sep 27, 2021 | Sep 21, 2021 |
| 424B3 | Prospectus | Aug 25, 2021 | — |
| EFFECT | Filing | Aug 24, 2021 | — |
| CORRESP | Letter to the SEC | Aug 20, 2021 | — |
| S-3/A | Filing | Aug 19, 2021 | — |
| UPLOAD | Letter from the SEC | Aug 19, 2021 | — |
| S-3 | Shelf registration | Aug 19, 2021 | — |
| 8-K |
Current report
Officer or director change
|
Aug 13, 2021 | Aug 13, 2021 |
| 10-Q | Quarterly report | Aug 9, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2021 | Aug 9, 2021 |
| 8-K |
Current report
Material agreement
|
Aug 5, 2021 | Aug 5, 2021 |
| DEFA14A | Additional proxy material | Aug 2, 2021 | — |
| DEF 14A | Proxy statement | Jul 28, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Officer or director change
|
Jul 23, 2021 | Jul 20, 2021 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Unregistered share sale
|
Jul 22, 2021 | Jul 18, 2021 |
| 8-K | Current report | Jun 24, 2021 | Jun 24, 2021 |
| SD/A | Filing | Jun 1, 2021 | — |
| SD | Specialized disclosure (conflict minerals) | May 28, 2021 | — |
| 10-K | Annual report | May 26, 2021 | Mar 31, 2021 |
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
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.