DOSSIER · 13F Holders · Q2 2026
QMCO

QUANTUM CORP

64 institutions still hold QUANTUM CORP as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 747906600·64 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$150M
visible holders
Holders
64
filers reporting
Concentration
19.43%
Alyeska Investment Group, L.P. #1
top holder share
AI Holders Summary · Q2 2026

64 institutions reported QMCO in Q2 2026. Alyeska Investment Group, L.P. leads at 19.4% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Alyeska Investment Group, L.P.
CIK 0001453072
$29M2.7M0.08%Q2 2026
02
Two Seas Capital LP
CIK 0001823138
$27M2.5M0.54%Q2 2026
03
OAKTREE CAPITAL MANAGEMENT LP
CIK 0000949509
$22M2.0M0.31%Q2 2026
04
Neuberger Berman Group LLC
CIK 0001465109
$13M1.2M0.01%Q2 2026
05
Portolan Capital Management, LLC
CIK 0001350290
$11M1.0M0.42%Q2 2026
06
ASHFORD CAPITAL MANAGEMENT INC
CIK 0000897070
$11M1.0M1.13%Q2 2026
07
MARSHALL WACE, LLP
CIK 0001318757
$8M713K0.01%Q2 2026
08
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$7M606K0.00%Q2 2026
09
Manatuck Hill Partners, LLC
CIK 0001467902
$4M350K1.28%Q2 2026
10
BlackRock, Inc.
CIK 0002012383
$3M273K0.00%Q2 2026
11
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$2M200K0.00%Q2 2026
12
Cinctive Capital Management LP
CIK 0001787258
$2M183K0.07%Q2 2026
13
BANK OF AMERICA CORP /DE/
CIK 0000070858
$2M170K0.00%Q2 2026
14
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$2M165K0.00%Q2 2026
15
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$2M155K0.00%Q2 2026
16
CITADEL ADVISORS LLC
CIK 0001423053
$2M137K0.00%Q2 2026
17
Walleye Capital LLC
CIK 0001758720
$1M120K0.00%Q2 2026
18
RAYMOND JAMES FINANCIAL INC
CIK 0000720005
$1M104K0.00%Q2 2026
19
Centiva Capital, LP
CIK 0001692507
$1M100K0.01%Q2 2026
20
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$980K89K0.00%Q2 2026
Page 1 of 4
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Insiders at QUANTUM CORP
Meyrath HuguesNash Laura A.Fichthorn JohnDialectic Technology Spv LlcCraythorne AnthonyBlevins Tony JClancy James CLerner James J