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.
All
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 |
|---|---|---|---|---|
| 3 | FORM 3 | 0002085976-25-000003 | Sep 17, 2025 | Aug 27, 2025 |
| 4 | FORM 4 | 0001979364-25-000004 | Sep 17, 2025 | Sep 12, 2025 |
| 8-K | 8-K | 0000709283-25-000047 | Sep 15, 2025 | Sep 12, 2025 |
| 10-Q | 10-Q | 0000709283-25-000045 | Sep 11, 2025 | Jun 30, 2025 |
| 8-K | 8-K | 0000709283-25-000038 | Sep 10, 2025 | — |
| 8-K | 8-K | 0000709283-25-000033 | Aug 28, 2025 | Aug 27, 2025 |
| 8-K | 8-K | 0000709283-25-000029 | Aug 26, 2025 | Aug 21, 2025 |
| 10-K | 10-K | 0000709283-25-000027 | Aug 26, 2025 | Mar 31, 2025 |
| 8-K | 8-K | 0000709283-25-000023 | Aug 18, 2025 | Aug 12, 2025 |
| NT 10-Q | NT 10-Q | 0000709283-25-000022 | Aug 15, 2025 | Jun 30, 2025 |
| 8-K | 8-K | 0000709283-25-000021 | Aug 8, 2025 | — |
| 8-K | 8-K | 0000709283-25-000018 | Jul 23, 2025 | Jul 17, 2025 |
| 3 | FORM 3 | 0000709283-25-000017 | Jul 14, 2025 | Jul 2, 2025 |
| 8-K | 8-K | 0000709283-25-000016 | Jul 8, 2025 | Jul 1, 2025 |
| NT 10-K | NT 10-K | 0001193125-25-152651 | Jun 30, 2025 | Mar 31, 2025 |
| 8-K | 8-K | 0001193125-25-142697 | Jun 18, 2025 | Jun 12, 2025 |
| 8-K | 8-K | 0001193125-25-133841 | Jun 3, 2025 | Jun 2, 2025 |
| SD | SD | 0000709283-25-000015 | May 28, 2025 | — |
| SCHEDULE 13G/A | — | 0001344676-25-000026 | May 15, 2025 | — |
| SCHEDULE 13G/A | — | 0001213900-25-040879 | May 8, 2025 | — |
| 8-K | 8-K | 0000709283-25-000014 | May 6, 2025 | — |
| 4 | FORM 4 | 0000709283-25-000013 | May 5, 2025 | May 1, 2025 |
| 3 | FORM 3 | 0000709283-25-000012 | Apr 30, 2025 | Apr 3, 2025 |
| 424B3 | 424B3 | 0001628280-25-020689 | Apr 29, 2025 | — |
| 8-K | 8-K | 0000709283-25-000011 | Apr 29, 2025 | Apr 24, 2025 |
| EFFECT | — | 9999999995-25-001270 | Apr 28, 2025 | — |
| UPLOAD | — | 0000000000-25-004373 | Apr 24, 2025 | — |
| CORRESP | — | 0001628280-25-019607 | Apr 24, 2025 | — |
| 4 | FORM 4 | 0000709283-25-000010 | Apr 23, 2025 | Apr 21, 2025 |
| 4 | FORM 4 | 0000709283-25-000009 | Apr 23, 2025 | Apr 21, 2025 |
| 4 | FORM 4 | 0000709283-25-000008 | Apr 23, 2025 | Apr 21, 2025 |
| S-3 | S-3 | 0001628280-25-018394 | Apr 18, 2025 | — |
| SCHEDULE 13D/A | — | 0000950170-25-055369 | Apr 17, 2025 | — |
| 8-K | 8-K | 0000709283-25-000007 | Apr 17, 2025 | Apr 16, 2025 |
| 4 | 4 | 0000950170-25-055367 | Apr 17, 2025 | Apr 15, 2025 |
| 144 | — | 0000950170-25-054229 | Apr 15, 2025 | — |
| 3 | FORM 3 | 0000709283-25-000006 | Apr 14, 2025 | Apr 4, 2025 |
| 4 | FORM 4 | 0000709283-25-000005 | Apr 4, 2025 | Apr 2, 2025 |
| 8-K | 8-K | 0001193125-25-072468 | Apr 3, 2025 | Mar 28, 2025 |
| SCHEDULE 13D/A | — | 0000950170-25-047962 | Mar 31, 2025 | — |
| DEF 14A | DEF 14A | 0001193125-25-065483 | Mar 27, 2025 | Apr 24, 2025 |
| SCHEDULE 13D/A | — | 0000950170-25-043427 | Mar 21, 2025 | — |
| 8-K | 8-K | 0000709283-25-000004 | Mar 20, 2025 | Mar 19, 2025 |
| PRE 14A | PRE 14A | 0001193125-25-055726 | Mar 17, 2025 | — |
| SCHEDULE 13D/A | — | 0000902664-25-001166 | Feb 21, 2025 | — |
| 8-K | 8-K | 0000709283-25-000002 | Feb 12, 2025 | — |
| 10-Q | 10-Q | 0000709283-25-000003 | Feb 12, 2025 | Dec 31, 2024 |
| 424B3 | 424B3 | 0001628280-25-004870 | Feb 11, 2025 | — |
| EFFECT | — | 9999999995-25-000396 | Feb 11, 2025 | — |
| CORRESP | — | 0001628280-25-004350 | Feb 7, 2025 | — |