DaveManuel.com · Institutional Ownership · Who Owns It
WESTLAKE CORPORATION (WLK)
Institutional ownership reported to the SEC as of Q2 2026, across 32 quarters.
365
Reporting holders
$2.9B
Reported value
31.1%
Of shares outstanding
0.4%
Calls
0.2%
Puts
+21
Holder change
Institutions report 39,791,379 shares against 127,796,548 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $240.5M | 3,294,162 | 0.00% | 8q | +7.0%+$15.7M |
| Capital World Investors | $207.5M | 2,842,348 | 0.02% | 3q | -32.5%-$99.9M |
| PRICE T ROWE ASSOCIATES INC /MD/ | $161.1M | 2,206,676 | 0.02% | 31q | -8.3%-$14.7M |
| Orbis Allan Gray Ltd | $152.2M | 2,084,364 | 0.52% | 4q | -60.6%-$234.3M |
| DIMENSIONAL FUND ADVISORS LP | $149.8M | 2,051,554 | 0.03% | 31q | +39.9%+$42.7M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $127.9M | 1,752,627 | 0.01% | 2q | -1.0%-$1.3M |
| BRANDES INVESTMENT PARTNERS, LP | $114.8M | 1,572,939 | 0.80% | 6q | -14.6%-$19.7M |
| AQR CAPITAL MANAGEMENT LLC | $114.6M | 1,570,453 | 0.04% | 31q | +503.9%+$95.7M |
| VANGUARD CAPITAL MANAGEMENT LLC | $106.9M | 1,464,223 | 0.00% | 2q | +0.6%+$629.9K |
| STATE STREET CORP | $106.1M | 1,453,407 | 0.00% | 31q | +5.3%+$5.3M |
| GOLDMAN SACHS GROUP INC | $93.5M | 1,280,873 | 0.01% | 31q | -8.1%-$8.2M |
| CITADEL ADVISORS LLC | $84.1M incl. $7.1M options CALL+PUT | 1,054,868 | 0.01% | 31q | +47.4%+$27.0M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $74.7M | 1,023,403 | 0.09% | 9q | +8.4%+$5.8M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $59.7M | 817,207 | 0.01% | 31q | -16.7%-$12.0M |
| GEODE CAPITAL MANAGEMENT, LLC | $52.5M | 718,597 | 0.00% | 31q | +17.0%+$7.6M |
| JACOBS LEVY EQUITY MANAGEMENT, INC | $51.8M | 709,355 | 0.19% | 9q | +103.2%+$26.3M |
| Balyasny Asset Management L.P. | $45.7M | 625,859 | 0.06% | 2q | +69.3%+$18.7M |
| Woodline Partners LP | $33.0M | 451,986 | 0.10% | 5q | +34.1%+$8.4M |
| Nuveen, LLC | $32.6M | 446,479 | 0.01% | 6q | -20.9%-$8.6M |
| MORGAN STANLEY | $31.9M | 437,571 | 0.00% | 35q | -10.1%-$3.6M |
| UBS Group AG | $31.5M | 431,633 | 0.00% | 31q | -46.8%-$27.7M |
| SCHRODER INVESTMENT MANAGEMENT GROUP | $28.1M | 375,889 | 0.02% | 2q | HELD |
| MILLENNIUM MANAGEMENT LLC | $26.7M | 366,074 | 0.01% | 31q | +330.7%+$20.5M |
| FMR LLC | $26.4M | 361,243 | 0.00% | 31q | -72.5%-$69.4M |
| ExodusPoint Capital Management, LP | $23.9M | 327,195 | 0.15% | new | NEW |
| Qube Research & Technologies Ltd | $23.5M | 321,718 | 0.02% | new | NEW |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $23.3M | 318,823 | 0.00% | 31q | +2.3%+$515.5K |
| Erste Asset Management GmbH | $22.8M | 305,000 | 0.18% | 27q | -22.8%-$6.7M |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. | $19.6M | 268,434 | 0.15% | 5q | +9.9%+$1.8M |
| Jupiter Topco LLC | $19.5M | 267,748 | 0.01% | new | FIRST |
| NORTHERN TRUST CORP | $19.2M | 262,926 | 0.00% | 31q | -2.3%-$454.3K |
| ROBOTTI ROBERT | $17.2M | 235,379 | 2.77% | 31q | +62.3%+$6.6M |
| BANK OF AMERICA CORP /DE/ | $17.0M | 232,213 | 0.00% | 31q | -2.0%-$348.4K |
| Susquehanna Portfolio Strategies, LLC | $16.8M | 230,396 | 0.27% | 2q | +1154.1%+$15.5M |
| ProShare Advisors LLC | $16.7M | 228,319 | 0.02% | 15q | -22.8%-$4.9M |
| NORGES BANK | $15.6M | 214,101 | 0.00% | 32q | +18.1%+$2.4M |
| Jump Financial, LLC | $15.3M | 209,861 | 0.12% | new | NEW |
| VANGUARD FIDUCIARY TRUST CO | $15.3M | 209,650 | 0.00% | 2q | +1.9%+$289.5K |
| D. E. Shaw & Co., Inc. | $14.6M | 200,534 | 0.01% | 8q | -14.0%-$2.4M |
| Russell Investments Group, Ltd. | $14.2M | 194,362 | 0.01% | 31q | +117.5%+$7.7M |
| Invesco Ltd. | $13.9M | 190,951 | 0.00% | 31q | +6.4%+$843.1K |
| JPMORGAN CHASE & CO | $12.3M | 163,287 | 0.00% | 31q | +67.1%+$4.9M |
| Cerity Partners LLC | $12.1M | 166,436 | 0.01% | 11q | +129.0%+$6.8M |
| Bank of New York Mellon Corp | $11.9M | 163,455 | 0.00% | 31q | -9.7%-$1.3M |
| Allspring Global Investments Holdings, LLC | $11.9M | 163,075 | 0.02% | 19q | -42.9%-$8.9M |
| SPROTT INC. | $11.7M | 160,110 | 0.37% | 31q | +20.7%+$2.0M |
| TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY | $11.4M | 156,757 | 0.08% | 15q | -12.0%-$1.6M |
| Campbell & CO Investment Adviser LLC | $10.8M | 148,180 | 0.57% | new | NEW |
| WELLINGTON MANAGEMENT GROUP LLP | $10.4M | 141,816 | 0.00% | 4q | -92.1%-$120.6M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $10.1M incl. $8.2M options CALL+PUT | 26,155 | 0.00% | 31q | +74.4%+$4.3M |
| Lighthouse Investment Partners, LLC | $9.9M | 135,361 | 0.27% | new | NEW |
| Recurrent Investment Advisors LLC | $9.4M | 128,771 | 0.58% | 27q | +14.2%+$1.2M |
| Quantinno Capital Management LP | $9.0M | 123,228 | 0.01% | 27q | +1.5%+$130.2K |
| HRT FINANCIAL LP | $8.5M | 116,395 | 0.02% | new | NEW |
| MARSHALL WACE, LLP | $8.1M | 111,574 | 0.01% | new | NEW |
| TUDOR INVESTMENT CORP ET AL | $8.1M | 110,710 | 0.01% | new | NEW |
| Assenagon Asset Management S.A. | $8.1M | 110,578 | 0.01% | new | NEW |
| WELLS FARGO & COMPANY/MN | $7.7M | 105,936 | 0.00% | 31q | -0.7%-$56.1K |
| ALLIANCEBERNSTEIN L.P. | $7.7M | 65,993 | 0.00% | 31q | -2.0%-$154.4K |
| MACKENZIE FINANCIAL CORP | $7.7M | 104,903 | 0.01% | 4q | +45.8%+$2.4M |
| ROYAL BANK OF CANADA | $7.1M | 96,772 | 0.00% | 31q | -6.9%-$524.1K |
| Thomist Capital Management, LP | $7.0M | 96,200 | 2.23% | 6q | +31.8%+$1.7M |
| BNP PARIBAS FINANCIAL MARKETS | $6.9M | 94,400 | 0.00% | 31q | +1311.1%+$6.4M |
| Point72 Asset Management, L.P. | $6.6M | 89,731 | 0.01% | new | NEW |
| Alberta Investment Management Corp | $6.5M | 89,200 | 0.04% | new | NEW |
| RHUMBLINE ADVISERS | $6.3M | 86,305 | 0.00% | 31q | -1.1%-$72.9K |
| Walleye Capital LLC | $6.0M | 82,847 | 0.02% | 10q | +38.5%+$1.7M |
| Meiji Yasuda Asset Management Co Ltd. | $6.0M | 82,778 | 0.27% | 2q | +4.2%+$240.9K |
| Squarepoint Ops LLC | $5.8M | 79,967 | 0.01% | 2q | +107.5%+$3.0M |
| NATIXIS | $5.6M | 77,117 | 0.02% | new | NEW |
| Tidal Investments LLC | $5.6M | 76,055 | 0.01% | 2q | +59.0%+$2.1M |
| PDT Partners, LLC | $5.5M | 75,777 | 0.29% | 4q | HELD |
| PRINCIPAL FINANCIAL GROUP INC | $5.5M | 75,653 | 0.00% | 22q | +1.6%+$85.6K |
| AGMAN CAPITAL LLC | $5.2M | 71,465 | 3.29% | 3q | -1.1%-$59.7K |
| Engineers Gate Manager LP | $5.2M | 71,301 | 0.07% | 3q | +67.8%+$2.1M |
| Swiss National Bank | $4.7M | 64,200 | 0.00% | 3q | -15.4%-$854.1K |
| SG Americas Securities, LLC | $4.3M | 59,116 | 0.00% | 7q | +140.5%+$2.5M |
| Turas Capital Management LP | $4.3M | 58,800 | 1.97% | new | NEW |
| Merewether Investment Management, LP | $3.9M | 53,439 | 0.07% | 4q | -75.7%-$12.2M |
| AXQ CAPITAL, LP | $3.8M | 51,437 | 0.41% | new | NEW |
| JANE STREET GROUP, LLC | $3.7M incl. $2.1M options CALL+PUT | 21,762 | 0.00% | 26q | -79.4%-$14.4M |
| Legal & General Group Plc | $3.7M | 50,025 | 0.00% | 31q | -1.4%-$52.0K |
| Mariner, LLC | $3.5M | 47,319 | 0.00% | new | NEW |
| TWO SIGMA INVESTMENTS, LP | $3.3M | 45,357 | 0.00% | new | NEW |
| BI Asset Management Fondsmaeglerselskab A/S | $3.1M | 41,791 | 0.02% | 4q | -0.6%-$18.4K |
| NEW YORK STATE COMMON RETIREMENT FUND | $3.0M | 40,926 | 0.00% | 31q | -86.8%-$19.6M |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | $2.7M | 37,155 | 0.00% | 23q | +11.6%+$281.8K |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | $2.7M | 36,900 | 0.00% | 31q | -17.0%-$551.8K |
| CITIGROUP INC | $2.7M | 36,569 | 0.00% | 31q | -33.0%-$1.3M |
| STATE OF WISCONSIN INVESTMENT BOARD | $2.6M | 35,823 | 0.01% | 3q | +41.9%+$771.7K |
| OCCUDO QUANTITATIVE STRATEGIES LP | $2.6M | 35,695 | 0.14% | 10q | -19.7%-$637.7K |
| BANK OF MONTREAL /CAN/ | $2.6M | 35,590 | 0.00% | 15q | -8.8%-$251.7K |
| HITE Hedge Asset Management LLC | $2.5M | 34,589 | 0.14% | new | NEW |
| Retirement Systems of Alabama | $2.5M | 34,454 | 0.01% | 15q | -15.7%-$469.5K |
| ACADIAN ASSET MANAGEMENT LLC | $2.5M | 34,498 | 0.00% | new | NEW |
| LOS ANGELES CAPITAL MANAGEMENT LLC | $2.4M | 32,600 | 0.01% | 3q | +20664.3%+$2.4M |
| ABN AMRO INVESTMENT SOLUTIONS | $2.3M | 31,597 | 0.02% | new | NEW |
| AMERIPRISE FINANCIAL INC | $2.3M | 31,288 | 0.00% | 31q | +9.8%+$204.5K |
| WORLDQUANT MILLENNIUM ADVISORS LLC | $2.3M | 31,204 | 0.01% | 2q | +69.8%+$936.6K |
| VANGUARD ASSET MANAGEMENT, Ltd | $2.2M | 30,040 | 0.00% | 2q | -9.9%-$242.2K |
Showing the largest 100 of 365 reported holders.
What the company announced
Form 8-K filings from the last 120 days, showing only the items worth a reader's attention. Earnings releases, exhibit attachments and general disclosures are filed constantly and are left out. Filed is when the SEC received it; event is the date the company says the thing happened.
| Filed | Event date | What | Source |
|---|---|---|---|
| 2026-09-29 | 2026-09-24 | Exit or disposal costs | filing |
| 2026-08-31 | 2026-08-31 | Directors or officers departed or appointed | filing |
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-11 | Chao Albert | Executive Chairman | Sold | 38,873 | $3.1M ×2 |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 78 | $42.3M | 678,742 | 13 | 19 | 24 | 0.0% |
| Q2 2026 | 365 | $2.9B | 39,791,379 | 81 | 108 | 120 | 0.6% |
| Q1 2026 | 344 | $5.2B | 44,111,583 | 85 | 112 | 83 | 0.8% |
| Q4 2025 | 304 | $3.5B | 46,452,380 | 52 | 90 | 114 | 2.0% |
| Q3 2025 | 308 | $3.3B | 41,715,819 | 58 | 94 | 101 | 2.3% |
| Q2 2025 | 311 | $3.1B | 39,596,673 | 50 | 116 | 102 | 2.5% |
| Q1 2025 | 362 | $3.7B | 36,405,547 | 41 | 136 | 106 | 1.9% |
| Q4 2024 | 380 | $4.1B | 35,288,516 | 29 | 137 | 122 | 2.0% |
| Q3 2024 | 407 | $5.2B | 33,903,218 | 65 | 139 | 120 | 2.4% |
| Q2 2024 | 383 | $5.0B | 34,170,583 | 64 | 113 | 130 | 1.5% |
| Q1 2024 | 351 | $5.5B | 35,541,242 | 42 | 111 | 118 | 2.5% |
| Q4 2023 | 357 | $5.1B | 36,380,436 | 42 | 94 | 131 | 0.3% |
| Q3 2023 | 337 | $4.9B | 39,324,528 | 31 | 80 | 136 | 0.3% |
| Q2 2023 | 342 | $4.4B | 36,953,899 | 39 | 97 | 124 | 0.6% |
| Q1 2023 | 343 | $4.9B | 42,235,601 | 48 | 105 | 115 | 0.4% |
| Q4 2022 | 345 | $3.8B | 36,404,053 | 65 | 94 | 127 | 0.8% |
| Q3 2022 | 307 | $14.2B | 163,347,461 | 31 | 115 | 111 | 0.3% |
| Q2 2022 | 343 | $12.7B | 129,104,502 | 85 | 116 | 102 | 0.4% |
| Q1 2022 | 319 | $17.5B | 141,618,556 | 64 | 91 | 110 | 0.3% |
| Q4 2021 | 293 | $16.9B | 173,495,023 | 51 | 87 | 93 | 0.2% |
| Q3 2021 | 263 | $16.2B | 176,905,342 | 36 | 97 | 81 | 0.2% |
| Q2 2021 | 269 | $16.6B | 183,932,806 | 59 | 84 | 71 | 0.2% |
| Q1 2021 | 232 | $16.3B | 183,035,769 | 43 | 81 | 62 | 0.1% |
| Q4 2020 | 221 | $3.2B | 39,538,257 | 30 | 54 | 80 | 0.5% |
| Q3 2020 | 205 | $19.4B | 306,803,087 | 25 | 51 | 75 | 0.1% |
| Q2 2020 | 213 | $14.8B | 275,288,158 | 42 | 43 | 88 | 0.2% |
| Q1 2020 | 214 | $2.6B | 67,414,927 | 32 | 71 | 70 | 1.0% |
| Q4 2019 | 253 | $13.6B | 195,529,117 | 34 | 67 | 88 | 0.4% |
| Q3 2019 | 250 | $4.4B | 65,610,228 | 22 | 54 | 100 | 1.4% |
| Q2 2019 | 272 | $5.6B | 78,909,971 | 34 | 87 | 92 | 1.9% |
| Q1 2019 | 306 | $4.9B | 72,029,990 | 52 | 90 | 106 | 0.7% |
| Q4 2018 | 300 | $3.2B | 47,855,933 | 7 | 5 | 7 | 0.7% |