QUANTUM CORP /DE/ — SC 13D/A Filings
48 SC 13D/A filings on record
This page lists all SC 13D/A filings submitted to the SEC by QUANTUM CORP /DE/ (QMCO), sorted by most recent first. Each row links to the full filing on EdgarLookup. QUANTUM CORP /DE/ has filed 48 SC 13D/A documents with the SEC since 2012. To view all SEC filings by QUANTUM CORP /DE/, see the full filings list.
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 |
|---|---|---|---|---|
| SC 13D/A | SC 13D/A | 0001193125-24-201499 | Aug 15, 2024 | — |
| SC 13D/A | SC 13D/A | 0001193125-23-187326 | Jul 14, 2023 | — |
| SC 13D/A | SC 13D/A | 0001193125-23-166865 | Jun 14, 2023 | — |
| SC 13D/A | SC 13D/A | 0001193125-22-227734 | Aug 24, 2022 | — |
| SC 13D/A | SC 13D/A | 0001193125-22-219908 | Aug 12, 2022 | — |
| SC 13D/A | AMENDMENT NO. 7 TO SCHEDULE 13D | 0001213900-22-045493 | Aug 8, 2022 | — |
| SC 13D/A | AMENDMENT NO. 6 TO SCHEDULE 13D | 0001213900-22-032280 | Jun 10, 2022 | — |
| SC 13D/A | AMENDMENT NO. 5 TO SCHEDULE 13D | 0001213900-22-022392 | Apr 28, 2022 | — |
| SC 13D/A | SC 13D/A | 0001193125-22-118239 | Apr 26, 2022 | — |
| SC 13D/A | AMENDMENT NO. 4 TO SCHEDULE 13D | 0001213900-21-055605 | Nov 1, 2021 | — |
| SC 13D/A | AMENDMENT TO NO. 3 SCHEDULE 13D | 0001213900-21-023270 | Apr 28, 2021 | — |
| SC 13D/A | AMENDMENT NO. 2 TO SCHEDULE 13D | 0001213900-21-007430 | Feb 8, 2021 | — |
| SC 13D/A | AMENDMENT NO. 1 SCHEDULE 13D | 0001213900-20-010312 | Apr 29, 2020 | — |
| SC 13D/A | AMENDMENT NO. 13 TO THE SCHEDULE 13D | 0000921895-20-000707 | Mar 11, 2020 | — |
| SC 13D/A | AMENDMENT NO. 12 TO THE SCHEDULE 13D | 0000921895-20-000070 | Jan 9, 2020 | — |
| SC 13D/A | AMENDMENT NO. 11 TO THE SCHEDULE 13D | 0000921895-19-002672 | Nov 5, 2019 | — |
| SC 13D/A | AMENDMENT NO. 9 TO THE SCHEDULE 13D | 0000921895-17-002693 | Nov 15, 2017 | — |
| SC 13D/A | SCHEDULE 13D AMENDMENT NO. 10 | 0000921895-17-002614 | Nov 13, 2017 | — |
| SC 13D/A | AMENDMENT NO. 2 | 0001214659-17-006582 | Nov 9, 2017 | — |
| SC 13D/A | MARCH 3, 2017 | 0001013594-17-000229 | Mar 3, 2017 | — |
| SC 13D/A | FEBRUARY 6, 2017 | 0001013594-17-000100 | Feb 6, 2017 | — |
| SC 13D/A | AMENDMENT NO. 1 | 0001214659-17-000736 | Feb 6, 2017 | — |
| SC 13D/A | AMENDMENT NO. 8 TO THE SCHEDULE 13D | 0000921895-16-006293 | Dec 7, 2016 | — |
| SC 13D/A | DECEMBER 6, 2016 | 0001013594-16-001333 | Dec 6, 2016 | — |
| SC 13D/A | SEPTEMBER 26, 2016 | 0001013594-16-001230 | Sep 27, 2016 | — |
| SC 13D/A | AMENDMENT NO. 5 TO THE SCHEDULE 13D | 0001013594-16-001089 | Jun 7, 2016 | — |
| SC 13D/A | AMENDMENT NO. 4 TO THE SCHEDULE 13D | 0000921895-16-004795 | Jun 2, 2016 | — |
| SC 13D/A | AMENDMENT NO. 3 TO THE SCHEDULE 13D | 0000921895-16-004259 | Apr 28, 2016 | — |
| SC 13D/A | AMENDMENT NO. 7 TO THE SCHEDULE 13D | 0000921895-16-004010 | Apr 6, 2016 | — |
| SC 13D/A | AMENDMENT NO. 2 TO THE SCHEDULE 13D | 0000921895-16-003136 | Feb 2, 2016 | — |
| SC 13D/A | AMENDMENT NO. 6 TO THE SCHEDULE 13D | 0000921895-16-003089 | Jan 27, 2016 | — |
| SC 13D/A | AMENDMENT NO. 1 TO THE SCHEDULE 13D | 0000921895-16-003043 | Jan 21, 2016 | — |
| SC 13D/A | AMENDMENT NO. 5 TO THE SCHEDULE 13D | 0000921895-15-001185 | May 7, 2015 | — |
| SC 13D/A | AMENDMENT NO. 4 TO THE SCHEDULE 13D | 0000921895-14-001630 | Jul 29, 2014 | — |
| SC 13D/A | AMENDMENT NO. 3 TO THE SCHEDULE 13D | 0000921895-14-001079 | May 13, 2014 | — |
| SC 13D/A | AMENDMENT NO. 2 TO THE SCHEDULE 13D | 0000921895-13-001109 | May 15, 2013 | — |
| SC 13D/A | AMENDMENT NO. 1 TO THE SCHEDULE 13D | 0000921895-13-000601 | Mar 15, 2013 | — |
| SC 13D/A | EFFECTIVE DATE - OCTOBER 6, 1995 - QUANTUM | 0000315066-95-003189 | Oct 13, 1995 | — |
| SC 13D/A | EFFECTIVE DATE - SEPTEMBER 22, 1995 - QUANTUM | 0000315066-95-003121 | Sep 28, 1995 | — |
| SC 13D/A | EFFECTIVE DATE - SEPTEMBER 15, 1995 - QUANTUM | 0000315066-95-003113 | Sep 19, 1995 | — |
| SC 13D/A | EFFECTIVE DATE - SEPTEMBER 13, 1995 - QUANTUM | 0000315066-95-003110 | Sep 18, 1995 | — |
| SC 13D/A | EFFECTIVE DATE - APRIL 11, 1995 - QUANTUM CORPORATION | 0000315066-95-002520 | Apr 21, 1995 | — |
| SC 13D/A | EFFECTIVE DATE - MARCH 27, 1995 - QUANTUM CORPORATION | 0000315066-95-002500 | Apr 6, 1995 | — |
| SC 13D/A | EFFECTIVE DATE - NOVEMBER 10, 1994 - QUANTUM CORPORATION | 0000315066-94-001831 | Nov 25, 1994 | — |
| SC 13D/A | EFFECTIVE DATE - OCTOBER 25, 1994 - QUANTUM CORPORATION | 0000315066-94-001767 | Nov 14, 1994 | — |
| SC 13D/A | EFFECTIVE DATE - JULY 22, 1994 - QUANTUM CORPORATION | 0000315066-94-001424 | Jul 29, 1994 | — |
| SC 13D/A | SCHEDULE 13D - 06-23-94 - QUANTUM CORPORATION | 0000315066-94-001296 | Jun 23, 1994 | — |
| SC 13D/A | SCHEDULE 13D - 06-21-94 - QUANTUM CORPORATION | 0000315066-94-001294 | Jun 22, 1994 | — |