QUANTUM CORP /DE/ — SC 13G/A Filings
131 SC 13G/A filings on record
This page lists all SC 13G/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 131 SC 13G/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 13G/A | — | 0001415889-24-028216 | Dec 4, 2024 | — |
| SC 13G/A | SC 13G/A | 0001019056-24-000088 | Feb 14, 2024 | — |
| SC 13G/A | — | 0001415889-24-003355 | Feb 12, 2024 | — |
| SC 13G/A | — | 0001011438-24-000011 | Jan 17, 2024 | — |
| SC 13G/A | QUANTUM CORPORATION | 0000902664-23-001497 | Feb 10, 2023 | — |
| SC 13G/A | NONE | 0001567619-23-002242 | Feb 10, 2023 | — |
| SC 13G/A | — | 0000834237-22-010198 | Jul 8, 2022 | — |
| SC 13G/A | NONE | 0001567619-22-011364 | May 20, 2022 | — |
| SC 13G/A | NONE | 0001567619-22-004019 | Feb 14, 2022 | — |
| SC 13G/A | SC 13G/A | 0000893739-22-000010 | Feb 14, 2022 | — |
| SC 13G/A | QUANTUM CORPORATION | 0000902664-22-001295 | Feb 9, 2022 | — |
| SC 13G/A | SC 13G/A | 0001104659-22-016017 | Feb 9, 2022 | — |
| SC 13G/A | QUANTUM CORP /DE/ | 0001193125-21-043637 | Feb 16, 2021 | — |
| SC 13G/A | SC 13G/A | 0001104659-21-013492 | Feb 8, 2021 | — |
| SC 13G/A | SC 13G/A | 0001104659-20-012313 | Feb 7, 2020 | — |
| SC 13G/A | AMENDMENT NO. 2 TO SCHEDULE 13G | 0001213900-20-002022 | Jan 28, 2020 | — |
| SC 13G/A | SC 13G/A | 0000905718-19-000182 | Feb 14, 2019 | — |
| SC 13G/A | SC 13G/A | 0001104659-19-007773 | Feb 13, 2019 | — |
| SC 13G/A | SC 13G/A | 0001104659-19-005357 | Feb 4, 2019 | — |
| SC 13G/A | SC 13G/A | 0001615774-19-001098 | Jan 28, 2019 | — |
| SC 13G/A | — | 0000215457-18-005864 | Jul 10, 2018 | — |
| SC 13G/A | — | 0001011438-17-000146 | Feb 14, 2017 | — |
| SC 13G/A | — | 0000215457-16-006468 | Jul 8, 2016 | — |
| SC 13G/A | — | 0000315066-16-005917 | Jun 10, 2016 | — |
| SC 13G/A | — | 0000315066-16-005396 | Feb 12, 2016 | — |
| SC 13G/A | — | 0000932471-16-011231 | Feb 10, 2016 | — |
| SC 13G/A | — | 0000215457-16-003686 | Jan 27, 2016 | — |
| SC 13G/A | — | 0001011438-15-000254 | Oct 7, 2015 | — |
| SC 13G/A | — | 0000315066-15-002248 | Feb 13, 2015 | — |
| SC 13G/A | — | 0000932471-15-003903 | Feb 10, 2015 | — |
| SC 13G/A | — | 0001086364-15-001176 | Jan 29, 2015 | — |
| SC 13G/A | — | 0000315066-14-002456 | Feb 14, 2014 | — |
| SC 13G/A | — | 0000919574-14-001603 | Feb 14, 2014 | — |
| SC 13G/A | — | 0000932471-14-004392 | Feb 12, 2014 | — |
| SC 13G/A | — | 0001086364-14-001430 | Jan 30, 2014 | — |
| SC 13G/A | QTM | 0000897226-13-000008 | Feb 15, 2013 | — |
| SC 13G/A | DISCLOSURE DOCUMENT | 0000902219-13-000383 | Feb 14, 2013 | — |
| SC 13G/A | — | 0000919574-13-001726 | Feb 14, 2013 | — |
| SC 13G/A | — | 0000315066-13-002675 | Feb 14, 2013 | — |
| SC 13G/A | SC 13G/A | 0001422848-12-000214 | Dec 10, 2012 | — |
| SC 13G/A | — | 0001011438-12-000238 | May 29, 2012 | — |
| SC 13G/A | — | 0001086364-12-002358 | Apr 11, 2012 | — |
| SC 13G/A | — | 0000897226-12-000006 | Feb 14, 2012 | — |
| SC 13G/A | — | 0000315066-12-002989 | Feb 14, 2012 | — |
| SC 13G/A | SC 13G/A | 0001422848-12-000013 | Feb 8, 2012 | — |
| SC 13G/A | — | 0000919574-12-000449 | Feb 6, 2012 | — |
| SC 13G/A | — | 0001011438-12-000022 | Jan 6, 2012 | — |
| SC 13G/A | — | 0001086364-11-007450 | Dec 9, 2011 | — |
| SC 13G/A | DOC ONE | 0000315066-11-003846 | Aug 10, 2011 | — |
| SC 13G/A | — | 0000897226-11-000005 | Feb 14, 2011 | — |