13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Industrial Organic ChemicalsMost-boughtAI cap-ex
WLK

WESTLAKE CORPORATION

356 institutions still hold WESTLAKE CORPORATION as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 960413102·Industrial Organic Chemicals·356 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 5.8%
vs prior quarter
13F value held
$3.6B
58.0% inst. owned
of float
Holders
356
+3 QoQ
filers reporting
Activity
+32 / −103
+841 added · −844 reduced
this quarter
Concentration
17.13%
Orbis Allan Gray Ltd #1
top holder share
AI Holders Summary · Q1 2026

356 institutions reported WLK in Q1 2026. Orbis Allan Gray Ltd leads at 17.1% of the visible book. +3 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
Orbis Allan Gray Ltd
CIK 0001663865
$618M5.3M2.61%Q1 202602
Capital World Investors
CIK 0001422849
$492M4.2M0.07%Q1 202603
BlackRock, Inc.
CIK 0002012383
$360M3.1M0.01%Q1 202604
BRANDES INVESTMENT PARTNERS, LP
CIK 0001015079
$215M1.8M1.52%Q1 202605
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$210M1.8M0.04%Q1 202606
Vanguard Portfolio Management
CIK 0002100121· Index
$207M1.8M0.01%Q1 202607
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$171M1.5M0.04%Q1 202608
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$170M1.5M0.00%Q1 202609
GOLDMAN SACHS GROUP INC
CIK 0000886982
$163M1.4M0.02%Q1 202610
STATE STREET CORP
CIK 0000093751
$161M1.4M0.01%Q1 202611
FMR LLC
CIK 0000315066
$153M1.3M0.01%Q1 202612
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
CIK 0000861177
$115M981K0.02%Q1 202613
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.
CIK 0001705339
$110M944K0.15%Q1 202614
UBS Group AG
CIK 0001610520
$95M811K0.01%Q1 202615
Holocene Advisors, LP
CIK 0001700574
$85M730K0.21%Q1 202616
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$72M614K0.00%Q1 202617
Nuveen, LLC
CIK 0001871926
$66M565K0.02%Q1 202618
MORGAN STANLEY
CIK 0000895421
$57M487K0.00%Q1 202619
Erste Asset Management GmbH
CIK 0002024532
$46M395K0.42%Q1 202620
SCHRODER INVESTMENT MANAGEMENT GROUP
CIK 0001086619
$43M375K0.04%Q1 2026
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