QUANTUM CORP /DE/ — All Filings
1,001 total filings on record
Public companies registered with the SEC are required to file periodic reports, disclosures, and notices throughout the year. The most important are the 10-K (annual report), 10-Q (quarterly report), and 8-K (material event notice). Use the filters below to narrow by form type.
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10-K
10-K/A
10-K405
10-Q
10-Q/A
144
15-12G
25-NSE
3
3/A
4
4/A
424B2
424B3
424B5
425
5
8-A12B
8-A12G
8-K
8-K/A
ARS
AW
CERT
CORRESP
D
DEF 14A
DEF 14C
DEFA14A
DEFC14A
DEFR14A
DFAN14A
EFFECT
NT 10-K
NT 10-Q
POS AM
PRE 14A
PRE 14C
PREC14A
PRER14A
PRRN14A
RW
S-1
S-1/A
S-3
S-3/A
S-3ASR
S-4
S-4/A
S-8
S-8 POS
SC 13D
SC 13D/A
SC 13G
SC 13G/A
SC TO-I
SC TO-I/A
SCHEDULE 13D
SCHEDULE 13D/A
SCHEDULE 13G/A
SD
SD/A
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| 4 | FORM 4 | 0001628280-26-014606 | Mar 4, 2026 | — |
| 424B3 | 424B3 | 0001628280-26-011100 | Feb 24, 2026 | — |
| EFFECT | — | 9999999995-26-000653 | Feb 23, 2026 | — |
| S-8 | S-8 | 0001628280-26-009336 | Feb 19, 2026 | — |
| S-1 | S-1 | 0001628280-26-009335 | Feb 19, 2026 | — |
| 10-Q | 10-Q | 0001628280-26-008558 | Feb 17, 2026 | Dec 31, 2025 |
| 8-K | 8-K | 0001628280-26-008553 | Feb 17, 2026 | — |
| 3 | FORM 3 | 0001628280-26-006539 | Feb 9, 2026 | Feb 2, 2026 |
| 8-K | 8-K | 0001628280-26-004461 | Feb 2, 2026 | — |
| 8-K | 8-K | 0001628280-26-002121 | Jan 15, 2026 | — |
| SCHEDULE 13D/A | — | 0000947871-26-000026 | Jan 12, 2026 | — |
| 4 | FORM 4 | 0001628280-26-000753 | Jan 5, 2026 | Jan 1, 2026 |
| 4 | FORM 4 | 0001628280-26-000750 | Jan 5, 2026 | Jan 1, 2026 |
| 4 | FORM 4 | 0001628280-26-000749 | Jan 5, 2026 | Jan 1, 2026 |
| 4 | FORM 4 | 0001628280-26-000748 | Jan 5, 2026 | Jan 1, 2026 |
| 4 | FORM 4 | 0001628280-26-000747 | Jan 5, 2026 | Jan 1, 2026 |
| 4 | FORM 4 | 0001628280-26-000745 | Jan 5, 2026 | Jan 1, 2026 |
| 4 | FORM 4 | 0001628280-26-000742 | Jan 5, 2026 | Jan 1, 2026 |
| 4 | FORM 4 | 0001628280-26-000741 | Jan 5, 2026 | Jan 1, 2026 |
| 4 | FORM 4 | 0000709283-25-000099 | Dec 29, 2025 | Sep 23, 2025 |
| 4 | — | 0000947871-25-001091 | Dec 23, 2025 | Dec 18, 2025 |
| 3 | — | 0000947871-25-001090 | Dec 23, 2025 | Dec 18, 2025 |
| SCHEDULE 13D/A | — | 0000947871-25-001089 | Dec 22, 2025 | — |
| 8-K | 8-K | 0000709283-25-000091 | Dec 18, 2025 | Dec 16, 2025 |
| DEFA14A | DEFA14A | 0000709283-25-000087 | Dec 2, 2025 | — |
| 424B3 | 424B3 | 0001628280-25-053789 | Nov 24, 2025 | — |
| EFFECT | — | 9999999995-25-003355 | Nov 21, 2025 | — |
| S-1 | S-1 | 0001628280-25-052461 | Nov 17, 2025 | — |
| 10-Q | 10-Q | 0000709283-25-000085 | Nov 13, 2025 | Sep 30, 2025 |
| 8-K | 8-K | 0000709283-25-000083 | Nov 13, 2025 | — |
| 4 | FORM 4 | 0002085976-25-000005 | Nov 4, 2025 | Nov 1, 2025 |
| 4 | FORM 4 | 0002085977-25-000004 | Nov 4, 2025 | Nov 1, 2025 |
| 4 | FORM 4 | 0001419111-25-000003 | Nov 4, 2025 | Nov 1, 2025 |
| ARS | ARS | 0001539497-25-002833 | Oct 31, 2025 | Mar 31, 2025 |
| DEFA14A | DEFA14A | 0001539497-25-002831 | Oct 31, 2025 | — |
| DEF 14A | DEF 14A | 0001539497-25-002829 | Oct 31, 2025 | Dec 16, 2025 |
| 8-K | 8-K | 0000709283-25-000072 | Oct 28, 2025 | — |
| PRE 14A | PRE 14A | 0001539497-25-002758 | Oct 21, 2025 | — |
| 8-K | 8-K | 0000709283-25-000063 | Oct 20, 2025 | — |
| SCHEDULE 13D | — | 0000947871-25-000896 | Oct 10, 2025 | — |
| 8-K | 8-K | 0000709283-25-000061 | Oct 6, 2025 | Sep 30, 2025 |
| 4 | FORM 4 | 0001628280-25-044169 | Oct 3, 2025 | Oct 2, 2025 |
| 4 | FORM 4 | 0001979364-25-000006 | Oct 3, 2025 | Oct 1, 2025 |
| 424B3 | 424B3 | 0001628280-25-043409 | Oct 1, 2025 | — |
| EFFECT | — | 9999999995-25-003172 | Sep 30, 2025 | — |
| POS AM | POS AM | 0001628280-25-042959 | Sep 26, 2025 | — |
| 10-Q/A | 10-Q/A | 0000709283-25-000058 | Sep 23, 2025 | Jun 30, 2025 |
| DEFA14A | DEFA14A | 0001193125-25-212384 | Sep 23, 2025 | — |
| 8-K | 8-K | 0001193125-25-212374 | Sep 23, 2025 | — |
| 3 | FORM 3 | 0002085976-25-000003 | Sep 17, 2025 | Aug 27, 2025 |