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WLK

Westlake Corp
$76.27 +1.47 (+1.97%) At close · Jul 7
Market Cap
$9.77B
Shares
128,122,944

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 335
Total Value: $4,986,236,801
Total Shares: 42,683,462
Showing 1–100 of 349 holdings by value · page 1 of 4

Institutional Ownership Trend

26 quarters

Superinvestors Holding WLK

All superinvestors →
Joel Greenblatt $4,037,766 Stanley Druckenmiller $2,475,883 Mario Gabelli $407,818

Holder Concentration

Across 335 13F filers
Top Holder
12.4%
Jun 2023 → Mar 2026 · range 9.2% – 12.4%
of institutional value
Top 5
39.4%
Jun 2023 → Mar 2026 · range 35.3% – 49.2%
of institutional value
Top 10
57.0%
Jun 2023 → Mar 2026 · range 51.6% – 64.2%
of institutional value
HHI
463
Jun 2023 → Mar 2026 · range 372 – 566
Broadly held
Showing 100 of 349
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Large Orbis Allan Gray Ltd $618,388,888 12.40% 5,293,519
Mega Capital World Investors $491,929,720 9.87% 4,211,006
Mega BlackRock, Inc. $359,698,937 7.21% 3,079,087
Mega PRICE T ROWE ASSOCIATES INC /MD/ $281,239,126 5.64% 2,407,457
Large BRANDES INVESTMENT PARTNERS, LP $215,258,371 4.32% 1,842,650
Mega WELLINGTON MANAGEMENT GROUP LLP $209,518,654 4.20% 1,793,517
Mega DIMENSIONAL FUND ADVISORS LP $171,260,455 3.43% 1,466,020
Mega VANGUARD CAPITAL MANAGEMENT LLC $170,042,491 3.41% 1,455,594
Mega GOLDMAN SACHS GROUP INC $162,768,458 3.26% 1,393,327
Mega STATE STREET CORP $161,269,192 3.23% 1,380,493
Mega FMR LLC $153,323,094 3.07% 1,312,473
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $114,647,728 2.30% 981,405
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $110,275,159 2.21% 943,975
Mega UBS Group AG $94,772,092 1.90% 811,266
Large Holocene Advisors, LP $85,282,688 1.71% 730,035
Mega CITADEL ADVISORS LLC $83,594,756 1.68% 715,586
Mega GEODE CAPITAL MANAGEMENT, LLC $71,766,497 1.44% 614,334
Mega Nuveen, LLC $65,973,393 1.32% 564,744
Mega MORGAN STANLEY $56,833,857 1.14% 486,508
Large Erste Asset Management GmbH $46,143,900 0.93% 395,000
Mega SCHRODER INVESTMENT MANAGEMENT GROUP $43,750,024 0.88% 374,508
Large Balyasny Asset Management L.P. $43,185,083 0.87% 369,672
Large JACOBS LEVY EQUITY MANAGEMENT, INC $40,774,268 0.82% 349,035
Large Woodline Partners LP $39,377,101 0.79% 337,075
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $36,420,036 0.73% 311,762
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $36,170,509 0.73% 309,626
Large ProShare Advisors LLC $34,556,641 0.69% 295,811
Large Allspring Global Investments Holdings, LLC $33,344,399 0.67% 285,434
Mega JANUS HENDERSON GROUP PLC $31,516,049 0.63% 269,783
Mega NORTHERN TRUST CORP Bank $31,441,984 0.63% 269,149
Large FEDERATED HERMES, INC. $31,150,169 0.62% 266,651
Mega AQR CAPITAL MANAGEMENT LLC $30,381,374 0.61% 260,070
Large VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. $28,540,060 0.57% 244,308
Mega BANK OF AMERICA CORP /DE/ Bank $27,684,703 0.56% 236,986
Mega D. E. Shaw & Co., Inc. $27,240,437 0.55% 233,183
Mid Merewether Investment Management, LP $25,688,718 0.52% 219,900
Mega VANGUARD FIDUCIARY TRUST CO Bank $24,028,004 0.48% 205,684
Mid DEPRINCE RACE & ZOLLO INC $23,757,216 0.48% 203,366
Mega Bank of New York Mellon Corp Bank $21,152,591 0.42% 181,070
Mega Invesco Ltd. $20,957,738 0.42% 179,402
Large TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY Pension $20,812,649 0.42% 178,160
Mid Ceredex Value Advisors LLC $20,782,278 0.42% 177,900
Large Man Group plc $18,724,610 0.38% 160,286
Small ROBOTTI ROBERT $16,939,366 0.34% 145,004
Large CAPSTONE INVESTMENT ADVISORS, LLC $15,865,090 0.32% 135,808
Mid SPROTT INC. $15,491,500 0.31% 132,610
Large Quantinno Capital Management LP $14,187,088 0.28% 121,444
Mid Recurrent Investment Advisors LLC $13,176,127 0.26% 112,790
Mid Yaupon Capital Management LP $12,504,880 0.25% 107,044
Mega WELLS FARGO & COMPANY/MN $12,465,277 0.25% 106,705
Mega JANE STREET GROUP, LLC $12,346,238 0.25% 105,686
Mega ROYAL BANK OF CANADA Bank $12,143,553 0.24% 103,951
Mega FIRST TRUST ADVISORS LP $11,950,569 0.24% 102,299
Mega JPMORGAN CHASE & CO $11,417,865 0.23% 97,739
Large Russell Investments Group, Ltd. $10,439,265 0.21% 89,362
Mega RHUMBLINE ADVISERS $10,198,853 0.20% 87,304
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $10,163,340 0.20% 87,000
Mega MILLENNIUM MANAGEMENT LLC $9,929,349 0.20% 84,997
Mid Meiji Yasuda Asset Management Co Ltd. $9,284,619 0.19% 79,478
Mega Swiss National Bank Bank $8,866,638 0.18% 75,900
Mid PDT Partners, LLC $8,852,269 0.18% 75,777
Mega PRINCIPAL FINANCIAL GROUP INC $8,700,870 0.17% 74,481
Small Thomist Capital Management, LP $8,527,860 0.17% 73,000
Large Cerity Partners LLC $8,490,360 0.17% 72,679
Small AGMAN CAPITAL LLC $8,444,100 0.17% 72,283
Large MACKENZIE FINANCIAL CORP $8,407,301 0.17% 71,968
Mega CITADEL ADVISORS LLC $8,072,262 0.16% 69,100
Mega ALLIANCEBERNSTEIN L.P. $7,863,738 0.16% 67,315
Mid CAPITAL INTERNATIONAL SARL $7,433,723 0.15% 63,634
Mega CITADEL ADVISORS LLC $7,301,250 0.15% 62,500
Small Lloyd Harbor Capital Management, LLC $7,242,840 0.15% 62,000
Large Rokos Capital Management LLP $7,102,656 0.14% 60,800
Large Walleye Capital LLC $6,987,471 0.14% 59,814
Mega CITIGROUP INC $6,373,582 0.13% 54,559
Mega Legal & General Group Plc $5,927,096 0.12% 50,737
Small Albar Capital Partners LLP $5,702,451 0.11% 48,814
Large Tidal Investments LLC $5,586,332 0.11% 47,820
Mega VICTORY CAPITAL MANAGEMENT INC $5,324,421 0.11% 45,578
Small Trek Financial, LLC $5,291,478 0.11% 45,296
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $5,193,700 0.10% 44,459
Mid OCCUDO QUANTITATIVE STRATEGIES LP $5,190,312 0.10% 44,430
Mid Engineers Gate Manager LP $4,964,733 0.10% 42,499
Mid BI Asset Management Fondsmaeglerselskab A/S $4,911,463 0.10% 42,043
Large Retirement Systems of Alabama Pension $4,776,302 0.10% 40,886
Mega BANK OF MONTREAL /CAN/ Bank $4,560,416 0.09% 39,038
Large Squarepoint Ops LLC $4,501,308 0.09% 38,532
Mid CAPITAL INTERNATIONAL LTD /CA/ $4,357,386 0.09% 37,300
Mid Twin Tree Management, LP $4,202,833 0.08% 35,977
Large Corient Private Wealth LLC $4,085,312 0.08% 34,971
Large Gotham Asset Management, LLC $4,037,766 0.08% 34,564
Mega VANGUARD ASSET MANAGEMENT, Ltd $3,896,881 0.08% 33,358
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $3,889,521 0.08% 33,295
Large Boston Partners $3,702,726 0.07% 31,696
Small Occam Crest Management LP $3,417,685 0.07% 29,256
Mega AMERIPRISE FINANCIAL INC $3,327,850 0.07% 28,487
Mega ENVESTNET ASSET MANAGEMENT INC $3,276,333 0.07% 28,046
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $3,037,320 0.06% 26,000
Large STATE OF WISCONSIN INVESTMENT BOARD $2,949,938 0.06% 25,252
Mega California Public Employees Retirement System Pension $2,920,500 0.06% 25,000
Large STIFEL FINANCIAL CORP $2,911,738 0.06% 24,925
Key facts CIK 1262823 CUSIP 960413102 13F (30d) 27 filings 7 filers Visit website Investor relations

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