WLK · Westlake Corp · Holdings
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.
Institutional Ownership Trend
Superinvestors Holding WLK
All superinvestors →Holder Concentration
Across 362 13F filersWho Holds WLK
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 361 filers, like-for-like change -10.4%; actively managed books -13.0%; index-like books -3.0%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 48.2% | 179 | +13.2% |
| Exempt adviser | 1.2% | 6 | +870.0% |
| Adviser | 7.7% | 5 | -34.7% |
| Bank | 7.7% | 19 | -7.9% |
| Insurer | 0.2% | 2 | -0.9% |
| Broker-dealer | 0.0% | 1 | +13.2% |
| Benefit plan | 0.3% | 7 | +0.7% |
| Non-US | 2.8% | 13 | +30.7% |
| Holding company | 15.3% | 9 | -29.6% |
| Unknown | 16.5% | 120 | -31.3% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 28.5% | 42 | -3.0% |
| Systematic-like | 11.1% | 41 | +116.6% |
| Concentrated | 1.2% | 57 | -29.1% |
| Diversified active | 59.2% | 220 | -21.4% |
| Unknown | 0.0% | 1 | 0.0% |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 48.0% | 201 | -2.2% |
| Medium turnover | 28.0% | 59 | -33.4% |
| High turnover | 13.4% | 66 | +35.8% |
| Unknown | 10.5% | 35 | +0.9% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 13.0% | 61 | +19.6% |
| Medium horizon | 13.1% | 51 | 0.0% |
| Long horizon | 62.8% | 227 | -9.0% |
| Unknown | 11.1% | 22 | -40.2% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 1.8% | 85 | +22.9% |
| $1B to $10B | 4.5% | 94 | -6.3% |
| $10B to $100B | 26.4% | 115 | -19.8% |
| $100B or more | 67.4% | 67 | -7.0% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 2.3% | 84 | +22.5% |
| Pooled investment vehicles | 9.9% | 41 | +21.9% |
| Registered funds and BDCs | 22.7% | 20 | +3.8% |
| Pension and profit sharing plans | 0.0% | 2 | +4424.9% |
| Insurance companies | 0.1% | 4 | -16.8% |
| Charitable organizations | 0.0% | 1 | +10.0% |
| Governments and sovereign funds | 0.2% | 2 | +0.8% |
| Other investment advisers | 0.1% | 5 | +2.8% |
| Other | 0.2% | 4 | +15.2% |
| Diversified | 12.5% | 15 | +25.5% |
| Corporations | 0.0% | 0 | -100.0% |
| Unknown | 51.8% | 183 | -25.1% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 17.3% | 55 | +60.5% |
| Private equity funds | 0.3% | 13 | +8.8% |
| Venture capital funds | 0.0% | 1 | +8180.9% |
| Real estate funds | 0.0% | 4 | +358.5% |
| Liquidity funds | 0.0% | 1 | 0.0% |
| Securitized asset funds | 2.1% | 2 | -16.6% |
| Other private funds | 15.8% | 16 | +4.0% |
| Mixed private funds | 0.2% | 2 | -4.7% |
| Private funds, type not stated | 0.2% | 3 | +13615.7% |
| No private funds | 13.6% | 88 | -1.7% |
| Unknown | 50.6% | 176 | -26.7% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 83.7% | 291 | -4.6% |
| Outside the US | 16.3% | 70 | -32.1% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 7 holders with no observed 2026-03-31 13F and 3 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
361 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 36.5% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies WLK's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | SLSR Solaris Resources Inc. | 3 |
| 2 | TEN Tsakos Energy Navigation Ltd | 3 |
| 3 | MT ArcelorMittal | 5 |
| 4 | NVGS Navigator Holdings Ltd. | 3 |
| 5 | ASC Ardmore Shipping Corp | 3 |
| 6 | CNR Core Natural Resources, Inc. | 5 |
| 7 | BG Bunge Global SA | 6 |
| 8 | IAG Iamgold Corp | 4 |
| 9 | INSW International Seaways, Inc. | 3 |
| 10 | PBF PBF Energy Inc. | 3 |
Shareholder Targets
13F filers that own its peers but not WLK, quarter ended Jun 30, 2026Found through its holder-overlap peers: SLSR, TEN, MT, NVGS, ASC, CNR, BG, IAG, INSW, PBF, FRO, SDRL, SOC, HP, HAL, VGNT, CENX, HBM, EVRG, FBIN. 1,818 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Glencore plc Holding company, Unknown | $4,867,464,571 2 held | BG, CENX |
| 2 | FIL Ltd Non-US, Diversified active | $1,645,973,992 7 held | HBM, IAG, BG |
| 3 | VAN ECK ASSOCIATES CORP Registered adviser, Index-like | $1,092,689,896 11 held | IAG, HAL, BG |
| 4 | FRANKLIN RESOURCES INC Adviser, Diversified active | $766,724,422 16 held | EVRG, FBIN, HAL |
| 5 | Amundi Holding company, Index-like | $662,676,495 15 held | HAL, BG, FBIN |
| 6 | Connor, Clark & Lunn Investment Management Ltd. Registered adviser, Diversified active | $449,852,386 9 held | IAG, HBM, HAL |
| 7 | GMT Capital Corp Registered adviser, Concentrated | $431,623,122 1 held | HBM |
| 8 | HARRIS ASSOCIATES L P Registered adviser, Index-like | $418,877,062 1 held | FBIN |
| 9 | DME Capital Management, LP Registered adviser, Diversified active | $401,464,255 3 held | CNR, FBIN, VGNT |
| 10 | Hancock Prospecting Pty Ltd Unknown, Concentrated | $375,062,061 1 held | HBM |
Fund Ownership of WLK by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 6.43% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 0.79% | 1,015,481 |
| Index ETFs | 5.64% | 7,203,691 |
| Active ETFs | 0.79% | 1,003,594 |
| Active funds | 3.56% | 4,546,227 |
| Unclassified | 2.16% | 2,761,239 |
| All registered funds | 12.93% | 16,530,232 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $240,473,826 | 8.26% | 3,294,162 | Shares | 2026-08-07 | |
| Mega Capital World Investors Adviser | $207,491,404 | 7.12% | 2,842,348 | Shares | 2026-08-12 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $161,087,348 | 5.53% | 2,206,676 | Shares | 2026-08-14 | |
| Large Orbis Allan Gray Ltd | $152,158,572 | 5.22% | 2,084,364 | Shares | 2026-08-14 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $149,763,442 | 5.14% | 2,051,554 | Shares | 2026-08-11 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $127,941,771 | 4.39% | 1,752,627 | Shares | 2026-08-13 | |
| Large BRANDES INVESTMENT PARTNERS, LP Registered adviser | $114,824,547 | 3.94% | 1,572,939 | Shares | 2026-08-14 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $114,643,069 | 3.94% | 1,570,453 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $106,888,279 | 3.67% | 1,464,223 | Shares | 2026-08-13 | |
| Mega STATE STREET CORP Bank | $106,098,711 | 3.64% | 1,453,407 | Shares | 2026-09-22 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $93,503,729 | 3.21% | 1,280,873 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $77,005,364 | 2.64% | 1,054,868 | Shares | 2026-09-02 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $74,708,419 | 2.56% | 1,023,403 | Shares | 2026-08-14 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $59,656,111 | 2.05% | 817,207 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $52,457,581 | 1.80% | 718,597 | Shares | 2026-08-12 | |
| Large JACOBS LEVY EQUITY MANAGEMENT, INC Registered adviser | $51,782,915 | 1.78% | 709,355 | Shares | 2026-08-14 | |
| Large Balyasny Asset Management L.P. Registered adviser | $45,687,707 | 1.57% | 625,859 | Shares | 2026-08-14 | |
| Large Woodline Partners LP Registered adviser | $32,994,978 | 1.13% | 451,986 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $32,592,967 | 1.12% | 446,479 | Shares | 2026-08-11 | |
| Mega MORGAN STANLEY Holding company | $31,942,683 | 1.10% | 437,571 | Shares | 2026-08-13 | |
| Mega UBS Group AG Bank | $31,509,209 | 1.08% | 431,633 | Shares | 2026-08-13 | |
| Mega SCHRODER INVESTMENT MANAGEMENT GROUP Registered adviser | $27,439,897 | 0.94% | 375,889 | Shares | 2026-08-13 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $26,723,402 | 0.92% | 366,074 | Shares | 2026-08-14 | |
| Mega FMR LLC Holding company | $26,370,739 | 0.91% | 361,243 | Shares | 2026-08-13 | |
| Large ExodusPoint Capital Management, LP Registered adviser | $23,885,235 | 0.82% | 327,195 | Shares | 2026-08-14 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $23,485,414 | 0.81% | 321,718 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $23,274,079 | 0.80% | 318,823 | Shares | 2026-08-14 | |
| Large Erste Asset Management GmbH Non-US | $22,265,000 | 0.76% | 305,000 | Shares | 2026-07-28 | |
| Large VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. Non-US | $19,595,682 | 0.67% | 268,434 | Shares | 2026-08-14 | |
| Mega Jupiter Topco LLC | $19,545,604 | 0.67% | 267,748 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $19,193,598 | 0.66% | 262,926 | Shares | 2026-08-13 | |
| Small ROBOTTI ROBERT Holding company | $17,182,667 | 0.59% | 235,379 | Shares | 2026-08-10 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $16,951,549 | 0.58% | 232,213 | Shares | 2026-08-14 | |
| Mid Susquehanna Portfolio Strategies, LLC | $16,818,908 | 0.58% | 230,396 | Shares | 2026-08-14 | |
| Large ProShare Advisors LLC Registered adviser | $16,667,287 | 0.57% | 228,319 | Shares | 2026-08-11 | |
| Mega NORGES BANK Non-US | $15,629,373 | 0.54% | 214,101 | Shares | 2026-08-12 | |
| Mid Jump Financial, LLC | $15,319,853 | 0.53% | 209,861 | Shares | 2026-08-13 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $15,304,450 | 0.53% | 209,650 | Shares | 2026-08-13 | |
| Mega D. E. Shaw & Co., Inc. | $14,638,982 | 0.50% | 200,534 | Shares | 2026-08-14 | |
| Mega Russell Investments Group, Ltd. | $14,188,426 | 0.49% | 194,362 | Shares | 2026-08-06 | |
| Mega Invesco Ltd. Adviser | $13,939,423 | 0.48% | 190,951 | Shares | 2026-08-14 | |
| Large Cerity Partners LLC Registered adviser | $12,149,828 | 0.42% | 166,436 | Shares | 2026-08-14 | |
| Mega Bank of New York Mellon Corp Bank | $11,932,215 | 0.41% | 163,455 | Shares | 2026-08-06 | |
| Mega JPMORGAN CHASE & CO Bank | $11,919,951 | 0.41% | 163,287 | Shares | 2026-08-12 | |
| Large Allspring Global Investments Holdings, LLC Holding company | $11,904,475 | 0.41% | 163,075 | Shares | 2026-08-13 | |
| Mid SPROTT INC. Holding company | $11,688,030 | 0.40% | 160,110 | Shares | 2026-07-28 | |
| Large TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY | $11,443,261 | 0.39% | 156,757 | Shares | 2026-08-12 | |
| Mid Campbell & CO Investment Adviser LLC Registered adviser | $10,817,140 | 0.37% | 148,180 | Shares | 2026-08-03 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $10,352,568 | 0.36% | 141,816 | Shares | 2026-08-14 | |
| Mid Lighthouse Investment Partners, LLC Registered adviser | $9,881,353 | 0.34% | 135,361 | Shares | 2026-08-14 | |
| Mid Recurrent Investment Advisors LLC Registered adviser | $9,400,283 | 0.32% | 128,771 | Shares | 2026-08-14 | |
| Large Quantinno Capital Management LP Registered adviser | $8,995,644 | 0.31% | 123,228 | Shares | 2026-08-13 | |
| Large HRT FINANCIAL LP | $8,496,835 | 0.29% | 116,395 | Shares | 2026-08-14 | |
| Large MARSHALL WACE, LLP Exempt adviser | $8,144,902 | 0.28% | 111,574 | Shares | 2026-08-13 | |
| Large TUDOR INVESTMENT CORP ET AL Registered adviser | $8,081,830 | 0.28% | 110,710 | Shares | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $7,733,328 | 0.27% | 105,936 | Shares | 2026-08-14 | |
| Large MACKENZIE FINANCIAL CORP Registered adviser | $7,657,919 | 0.26% | 104,903 | Shares | 2026-08-13 | |
| Mega ROYAL BANK OF CANADA Bank | $7,064,356 | 0.24% | 96,772 | Shares | 2026-08-14 | |
| Small Thomist Capital Management, LP | $7,022,600 | 0.24% | 96,200 | Shares | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $6,891,200 | 0.24% | 94,400 | Shares | 2026-08-13 | |
| Large Point72 Asset Management, L.P. Registered adviser | $6,550,363 | 0.22% | 89,731 | Shares | 2026-08-14 | |
| Large Alberta Investment Management Corp Non-US | $6,511,600 | 0.22% | 89,200 | Shares | 2026-08-06 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $6,300,265 | 0.22% | 86,305 | Shares | 2026-08-12 | |
| Large Walleye Capital LLC Registered adviser | $6,047,831 | 0.21% | 82,847 | Shares | 2026-08-03 | |
| Mid Meiji Yasuda Asset Management Co Ltd. | $6,042,794 | 0.21% | 82,778 | Shares | 2026-08-13 | |
| Large Squarepoint Ops LLC Registered adviser | $5,837,591 | 0.20% | 79,967 | Shares | 2026-08-14 | |
| Large NATIXIS Non-US | $5,629,541 | 0.19% | 77,117 | Shares | 2026-08-13 | |
| Large Tidal Investments LLC Registered adviser | $5,552,015 | 0.19% | 76,055 | Shares | 2026-08-13 | |
| Mid PDT Partners, LLC Registered adviser | $5,531,721 | 0.19% | 75,777 | Shares | 2026-08-14 | |
| Mega PRINCIPAL FINANCIAL GROUP INC Insurer | $5,522,669 | 0.19% | 75,653 | Shares | 2026-08-04 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $5,387,400 | 0.18% | 73,800 | Call | 2026-09-02 | |
| Small AGMAN CAPITAL LLC Registered adviser | $5,216,945 | 0.18% | 71,465 | Shares | 2026-07-27 | |
| Mid Engineers Gate Manager LP | $5,204,973 | 0.18% | 71,301 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $4,971,300 | 0.17% | 68,100 | Call | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $4,817,489 | 0.17% | 65,993 | Shares | 2026-08-14 | |
| Mega Swiss National Bank | $4,686,600 | 0.16% | 64,200 | Shares | 2026-08-11 | |
| Mega SG Americas Securities, LLC | $4,315,468 | 0.15% | 59,116 | Shares | 2026-08-07 | |
| Small Turas Capital Management LP | $4,292,400 | 0.15% | 58,800 | Shares | 2026-08-14 | |
| Mid Merewether Investment Management, LP Registered adviser | $3,901,047 | 0.13% | 53,439 | Shares | 2026-08-14 | |
| Small AXQ CAPITAL, LP Registered adviser | $3,754,901 | 0.13% | 51,437 | Shares | 2026-08-06 | |
| Mega Legal & General Group Plc | $3,651,825 | 0.13% | 50,025 | Shares | 2026-08-14 | |
| Large Mariner, LLC Registered adviser | $3,454,287 | 0.12% | 47,319 | Shares | 2026-08-13 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $3,311,061 | 0.11% | 45,357 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $3,212,000 | 0.11% | 44,000 | Put | 2026-08-14 | |
| Large BI Asset Management Fondsmaeglerselskab A/S | $3,050,743 | 0.10% | 41,791 | Shares | 2026-08-10 | |
| Large NEW YORK STATE COMMON RETIREMENT FUND | $2,987,598 | 0.10% | 40,926 | Shares | 2026-07-29 | |
| Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE | $2,712,315 | 0.09% | 37,155 | Shares | 2026-09-09 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $2,693,700 | 0.09% | 36,900 | Shares | 2026-08-24 | |
| Mega CITIGROUP INC Bank | $2,669,537 | 0.09% | 36,569 | Shares | 2026-08-03 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD Benefit plan | $2,615,079 | 0.09% | 35,823 | Shares | 2026-08-14 | |
| Mid OCCUDO QUANTITATIVE STRATEGIES LP Registered adviser | $2,605,735 | 0.09% | 35,695 | Shares | 2026-08-13 | |
| Mega BANK OF MONTREAL /CAN/ Bank | $2,598,070 | 0.09% | 35,590 | Shares | 2026-08-12 | |
| Mid HITE Hedge Asset Management LLC Registered adviser | $2,524,997 | 0.09% | 34,589 | Shares | 2026-08-14 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $2,518,354 | 0.09% | 34,498 | Shares | 2026-08-13 | |
| Large Retirement Systems of Alabama | $2,515,142 | 0.09% | 34,454 | Shares | 2026-07-28 | |
| Large LOS ANGELES CAPITAL MANAGEMENT LLC Registered adviser | $2,379,800 | 0.08% | 32,600 | Shares | 2026-08-13 | |
| Large ABN AMRO INVESTMENT SOLUTIONS | $2,306,581 | 0.08% | 31,597 | Shares | 2026-07-23 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $2,284,024 | 0.08% | 31,288 | Shares | 2026-08-14 | |
| Large WORLDQUANT MILLENNIUM ADVISORS LLC | $2,277,892 | 0.08% | 31,204 | Shares | 2026-08-14 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $2,192,920 | 0.08% | 30,040 | Shares | 2026-08-13 |
Showing the top 100 of 368 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.