13F Insight
DOSSIER · 13F Holders · Q1 2026Most-boughtAI cap-ex
WDC 3 11/15/28

WESTERN DIGITAL CORP

68 institutions still hold WESTERN DIGITAL CORP as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 958102AT2·68 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 1.2%
vs prior quarter
13F value held
$9.3B
71.0% inst. owned
of float
Holders
68
+111 QoQ
filers reporting
Activity
+56 / −77
+897 added · −795 reduced
this quarter
Concentration
15.81%
MILLENNIUM MANAGEMENT LLC #1
top holder share
AI Holders Summary · Q1 2026

68 institutions reported WDC 3 11/15/28 in Q1 2026. MILLENNIUM MANAGEMENT LLC leads at 15.8% of the visible book. +111 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$1.5B205.6M0.61%Q1 202602
WHITEBOX ADVISORS LLC
CIK 0001257391
$1.5B204.4M18.01%Q1 202603
VOYA INVESTMENT MANAGEMENT LLC
CIK 0001068837
$899M125.5M0.94%Q1 202604
D. E. Shaw & Co., Inc.
CIK 0001009207
$709M154.4M0.39%Q4 202505
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$639M89.2M0.52%Q1 202606
CAPSTONE INVESTMENT ADVISORS, LLC
CIK 0001426196
$577M80.5M1.00%Q1 202607
Sculptor Capital LP
CIK 0001054587
$502M70.0M5.23%Q1 202608
CITADEL ADVISORS LLC
CIK 0001423053
$417M90.8M0.06%Q4 202509
Calamos Advisors LLC
CIK 0001316507
$399M55.6M1.41%Q1 202610
Aequim Alternative Investments LP
CIK 0001728201
$397M55.5M7.71%Q1 202611
STATE STREET CORP
CIK 0000093751
$245M34.1M0.01%Q1 202612
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND
CIK 0001535845
$229M32.0M0.37%Q1 202613
BANK OF MONTREAL /CAN/
CIK 0000927971
$225M31.4M0.08%Q1 202614
BANK OF NOVA SCOTIA
CIK 0000009631
$217M30.3M0.38%Q1 202615
BlackRock, Inc.
CIK 0002012383
$190M26.5M0.00%Q1 202616
Boussard & Gavaudan Investment Management LLP
CIK 0001614986
$186M27K17.57%Q1 202617
Alberta Investment Management Corp
CIK 0001463559· Sovereign
$179M25.0M1.08%Q1 202618
FMR LLC
CIK 0000315066
$142M19.9M0.01%Q1 202619
BNP PARIBAS FINANCIAL MARKETS
CIK 0001166588
$115M16.1M0.06%Q1 202620
MACKAY SHIELDS LLC
CIK 0000061227
$111M15.5M4.06%Q1 2026
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