DOSSIER · 13F Holders · Q3 2026
QMCO

QUANTUM CORP

88 institutions still hold QUANTUM CORP as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 747906600·88 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$221M
visible holders
Holders
88
filers reporting
Concentration
21.42%
Two Seas Capital LP #1
top holder share
AI Holders Summary · Q3 2026

88 institutions reported QMCO in Q3 2026. Two Seas Capital LP leads at 21.4% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
Two Seas Capital LP
CIK 0001823138
$47M1.5M0.54%Q3 2026
02
Alyeska Investment Group, L.P.
CIK 0001453072
$29M2.7M0.08%Q2 2026
03
OAKTREE CAPITAL MANAGEMENT LP
CIK 0000949509
$22M2.0M0.31%Q2 2026
04
UBS Group AG
CIK 0001610520
$15M460K0.00%Q3 2026
05
Neuberger Berman Group LLC
CIK 0001465109
$13M1.2M0.01%Q2 2026
06
Portolan Capital Management, LLC
CIK 0001350290
$11M1.0M0.42%Q2 2026
07
ASHFORD CAPITAL MANAGEMENT INC
CIK 0000897070
$11M1.0M1.13%Q2 2026
08
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$10M330K0.01%Q3 2026
09
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$10M305K0.00%Q3 2026
10
MARSHALL WACE, LLP
CIK 0001318757
$8M713K0.01%Q2 2026
11
JPMORGAN CHASE & CO
CIK 0000019617
$7M205K0.00%Q3 2026
12
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$7M606K0.00%Q2 2026
13
JANE STREET GROUP, LLC
CIK 0001595888· Market maker
$6M202K0.00%Q3 2026
14
ACADIAN ASSET MANAGEMENT LLC
CIK 0000916542
$4M139K0.01%Q3 2026
15
RAYMOND JAMES FINANCIAL INC
CIK 0000720005
$4M129K0.00%Q3 2026
16
Manatuck Hill Partners, LLC
CIK 0001467902
$4M350K1.28%Q2 2026
17
STATE STREET CORP
CIK 0000093751
$4M118K0.00%Q3 2026
18
Hillsdale Investment Management Inc.
CIK 0001368465
$3M103K0.07%Q3 2026
19
BlackRock, Inc.
CIK 0002012383
$3M273K0.00%Q2 2026
20
Squarepoint Ops LLC
CIK 0001642575
$3M89K0.00%Q3 2026
Page 1 of 5
68 more holders available. Log in →
Insiders at QUANTUM CORP
Tracy John R. →Blevins Tony J →White Yue Zhou →Fichthorn John →Jaworksi Don →Meyrath Hugues →Nash Laura A. →Dialectic Technology Spv Llc →