Quantum Corp /DE/

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Quantum Corp /DE/
TickerQMCO
CIK #0000709283
CUSIP747906501
SectorTechnology - Computer Storage Devices
Address1650 Technology Drive Suite 700, San Jose, CA 95110
Source [EDGAR]
Reg D Offering (Form D) Filed Raised Terms
Quantum Corp /DE/ 2011-06-29 3.6 M Exemption: 506 · Duration: One year or less · Revenue: Over $100,000,000
CIK Filing 2011 - 2026
[0000709283] 10-K
[0000709283] 10-Q
[0000709283] 3
[0000709283] 4
[0000709283] 8-K
[0000709283] SC 13D
[0000709283] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
Dialectic Technology SPV LLC Quantum Corp /DE/ [2025-10-10] 0.0
Blue Torch Capital LP Quantum Corp /DE/ [2025-01-06] 0.0
Vanguard Group Inc Quantum Corp /DE/ [2024-02-13] 5.28
ADK SoHo Fund LP Quantum Corp /DE/ [2023-12-04] 7.7
Long Focus Capital Management LLC Quantum Corp /DE/ [2023-05-11] 3.2
Pacific Investment Management Co LLC Quantum Corp /DE/ [2022-03-28] 0.54
BlackRock Inc Quantum Corp /DE/ [2022-03-11] 6.6
BlackRock Inc Quantum Corp /DE/ [2022-02-08] 6.6
Senvest Management LLC Quantum Corp /DE/ [2021-11-18] 5.13
Neuberger Berman Group LLC Quantum Corp /DE/ [2021-04-08] 10.87
180 Degree Capital Corp /NY/ Quantum Corp /DE/ [2021-01-29] 5.5
B Riley Financial Inc Quantum Corp /DE/ [2020-04-06] 20.4
Pacific Investment Management Co LLC Quantum Corp /DE/ [2019-01-10] 10.8
B Riley Financial Inc Quantum Corp /DE/ [2018-12-31] 11.81
TCW Group Inc Quantum Corp /DE/ [2018-12-10] 12.2
Park West Asset Management LLC Quantum Corp /DE/ [2018-02-14] 6.9
Portolan Capital Management LLC Quantum Corp /DE/ [2018-02-02] 5.58
BlackRock Inc Quantum Corp /DE/ [2018-02-01] 5.3
Park West Asset Management LLC Quantum Corp /DE/ [2017-11-20] 5.8
Soros Fund Management LLC Quantum Corp /DE/ [2016-07-29] 5.27
VIEX Special Opportunities Fund III LP Quantum Corp /DE/ [2015-12-28] 2.8
Private Capital Management LLC Quantum Corp /DE/ [2015-08-17] 6.31
Private Capital Management LLC Quantum Corp /DE/ [2014-02-13] 4.72
Vanguard Group Inc Quantum Corp /DE/ [2013-02-13] 5.66
BlackRock Inc Quantum Corp /DE/ [2013-01-30] 5.37
Starboard Value LP Quantum Corp /DE/ [2012-11-01] 10.4
Wellington Management Co LLP Quantum Corp /DE/ [2012-02-14] 6.66
BlackRock Inc Quantum Corp /DE/ [2012-02-09] 5.05
Form 3/4/5 Filer 2011 - 2026
Quantum Corp /DE/
Nash Laura A
Meyrath Hugues
Dialectic Technology SPV LLC
Fichthorn John
Craythorne Anthony
White William Hillis
White Yue Zhou
Jaworksi Don
Clancy James C
Tracy John R
Blevins Tony J
Cabrera Brian E
Moorehead Lewis W
Lerner James J
Pacific Investment Management Co LLC
Gianella Kenneth P
Spanjaard Henk Jan
Arden Todd
Hurley John
Dodson J Michael
Jacoby Rebecca
Rothman Marc E
Neumeyer Christopher D
Rau Raghavendra
FBR Capital Markets & Co
Riley Bryant R
BRC Group Holdings Inc
King Elizabeth
BRC Partners Management GP LLC
B Riley Capital Management LLC
BRC Partners Opportunity Fund LP
MacPherson Regan J
Martella Donald E Jr
B Riley Securities Inc
Singer Eric
VIEX Opportunities Fund LP Series One
VIEX Capital Advisors LLC
VIEX GP LLC
VIEX Special Opportunities Fund III LP
VIEX Special Opportunities GP III LLC
VIEX Opportunities Fund LP - Series Two
BR Dialectic Capital Management LLC
Dialectic Antithesis Partners LP
Press Clifford
Sanchez Adalio T
Hall Shawn D
Ahmad Fuad
Britts William C
Stedman Geoff G
Dennis Patrick
Gacek Jon W
Pinchev Alex
Auvil Paul R III
Clark Robert S
Roberson David Earle
Mutch John
Powers Gregg J
Krall David
Dinardo Louis
Fuller Dale L
Feld Peter A
Smith Jeffrey C
Mitchell Mark R
Starboard Value & Opportunity Master Fund Ltd
Starboard Value GP LLC
Starboard Value & Opportunity C LP
Starboard Value LP
Starboard Value R LP
Starboard Principal Co GP LLC
Starboard Value & Opportunity S LLC
Starboard Principal Co LP
Starboard Value R GP LLC
Willis Christopher Shawn
Andersen Robert J
Black Philip
Lee Janae S
Breard Linda M
Soros George
Soros Fund Management LLC
Soros Robert
Crowell Christopher
Terino Edward
Brown Michael A/CA
Stinson Theodore A
Buchsbaum Thomas S
Marengi Joseph A
Fetter Elizabeth A
Belluzzo Richard
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
White William Hillis
Common Stock
2026-03-04 Grant 25,000 $0.00
Meyrath Hugues
Employee Stock Option (right to buy) · derivative
2026-01-01 Grant 50,000 $0.00
Clancy James C
Common Stock
2026-01-01 Grant 12,000 $0.00
Fichthorn John
Common Stock
2026-01-01 Grant 12,000 $0.00
Blevins Tony J
Common Stock
2026-01-01 Grant 12,000 $0.00
Jaworksi Don
Common Stock
2026-01-01 Grant 12,000 $0.00
Meyrath Hugues
Common Stock
2026-01-01 Grant 62,500 $0.00
Craythorne Anthony
Common Stock
2026-01-01 Grant 15,000 $0.00
Tracy John R
Common Stock
2026-01-01 Grant 12,000 $0.00
White Yue Zhou
Common Stock
2026-01-01 Grant 12,000 $0.00
Fichthorn John
Convertible Notes · derivative
2025-12-18 Other 0
Dialectic Technology SPV LLC
Convertible Notes · derivative
2025-12-18 Other
Blevins Tony J
Common Stock
2025-11-01 Grant 1,000 $0.00
Clancy James C
Common Stock
2025-11-01 Grant 1,000 $0.00
Meyrath Hugues
Employee Stock Option (right to buy) · derivative
2025-11-01 Grant 50,000 $0.00
Meyrath Hugues
Common Stock
2025-11-01 Grant 37,500 $0.00
Meyrath Hugues
Common Stock
2025-10-02 Sell 2,975 $10.86 32,308
Nash Laura A
Common Stock
2025-10-02 Sell 611 $10.86 6,635
Nash Laura A
Common Stock
2025-10-01 Sell 118 $9.91 1,169
Nash Laura A
Common Stock
2025-10-01 Grant 500 $0.00
showing 20 of 200 most recent transactions
13F Ownership Over TimeHoldersShares Held
2026-03-31 37 1,486,763
2025-12-31 40 1,985,687
2025-09-30 29 865,131
2025-06-30 36 902,741
2025-03-31 30 1,689,433
2024-12-31 47 1,838,070
2024-09-30 26 2,274,509
2024-06-30 52 47,930,611
2024-03-31 61 49,091,389
2023-12-31 62 51,061,811
2023-09-30 61 56,979,900
2023-06-30 64 58,288,737
Form 13F Holdings
Firm Period DFND Voting Shares
Farther Finance Advisors LLC [2026-06-30] SOLE 0 4
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