Westlake Corporation (WLK) Ownership
WLK ownership summary
as of October 18, 2026- Institutions
- 31.6% of shares outstanding
- Insiders
- 74.51% of shares outstanding
- Shares outstanding
- 127.8M
- Float
- 33.2M shares available to trade
- Short interest
- 14.95% 4.9M shares short
- Days to cover
- 6.82 short interest down 14.3% vs prior month
- Institutions 31.59%
- Insiders 74.51%
WLK top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 2.58% | 3.3M | $208.6M | +215,075 (+7.0%) | June 30, 2026 |
| 2 | Capital World Investors | 2.22% | 2.8M | $180.0M | −1.4M (−32.5%) | June 30, 2026 |
| 3 | T. Rowe Price Associates, Inc. | 1.73% | 2.2M | $139.7M | −200,781 (−8.3%) | June 30, 2026 |
| 4 | Orbis Allan Gray Ltd | 1.63% | 2.1M | $132.0M | −3.2M (−60.6%) | June 30, 2026 |
| 5 | Dimensional Fund Advisors, Inc. | 1.61% | 2.1M | $129.9M | +585,534 (+39.9%) | June 30, 2026 |
| 6 | Vanguard Portfolio Management, LLC | 1.37% | 1.8M | $111.0M | −17,181 (−1.0%) | June 30, 2026 |
| 7 | Brandes Investment Partners & Co | 1.23% | 1.6M | $99.6M | −269,711 (−14.6%) | June 30, 2026 |
| 8 | AQR Capital Management LLC | 1.23% | 1.6M | $99.5M | +1.3M (+503.9%) | June 30, 2026 |
| 9 | Vanguard Capital Management, LLC | 1.15% | 1.5M | $92.7M | +8,629 (+0.6%) | June 30, 2026 |
| 10 | State Street Corp | 1.14% | 1.5M | $92.0M | +72,914 (+5.3%) | June 30, 2026 |
| 11 | The Goldman Sachs Group Inc | 1.00% | 1.3M | $81.1M | −112,454 (−8.1%) | June 30, 2026 |
| 12 | Citadel Advisors Llc | 0.83% | 1.1M | $66.8M | +339,282 (+47.4%) | June 30, 2026 |
| 13 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.80% | 1.0M | $64.8M | +79,428 (+8.4%) | June 30, 2026 |
| 14 | UBS Asset Mgmt Americas Inc | 0.64% | 817K | $51.8M | −164,198 (−16.7%) | June 30, 2026 |
| 15 | Geode Capital Management, LLC | 0.56% | 719K | $45.5M | +104,263 (+17.0%) | June 30, 2026 |
| 16 | Jacobs Levy Equity Management, Inc. | 0.56% | 709K | $44.9M | +360,320 (+103.2%) | June 30, 2026 |
| 17 | Balyasny Asset Management LLC | 0.49% | 626K | $39.6M | +256,187 (+69.3%) | June 30, 2026 |
| 18 | Woodline Partners LP | 0.35% | 452K | $28.6M | +114,911 (+34.1%) | June 30, 2026 |
| 19 | Nuveen, LLC | 0.35% | 446K | $28.3M | −118,265 (−20.9%) | June 30, 2026 |
| 20 | Morgan Stanley - Brokerage Accounts | 0.34% | 438K | $27.7M | −48,937 (−10.1%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 11 holders added 3.4M shares and 9 cut 5.5M.
WLK top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Mid-Cap ETF | 0.93% | 1.2M | $74.9M | −420 (−0.0%) | September 30, 2026 |
| 2 | T. Rowe Price Mid-Cap Value | 0.87% | 1.1M | $70.3M | — | September 30, 2026 |
| 3 | Global X US Infrastructure Dev ETF | 0.82% | 1.1M | $66.7M | +7,380 (+0.7%) | September 30, 2026 |
| 4 | Vanguard MStar Total Stk Mkt Idx Invest | 0.80% | 1.0M | $64.7M | −1,672 (−0.2%) | August 31, 2026 |
| 5 | Vanguard Small Cap Index | 0.56% | 720K | $45.6M | −17,133 (−2.3%) | September 30, 2026 |
| 6 | Orbis SICAV Global Bal Instl Inv | 0.42% | 531K | $33.6M | +99,892 (+23.2%) | March 31, 2026 |
| 7 | Orbis Global Equity Investor | 0.38% | 480K | $30.4M | −768,051 (−61.5%) | June 30, 2026 |
| 8 | Jupiter Merian Glb Eq Abs Rt I USD Acc | 0.37% | 474K | $30.0M | +474,231 (0.0%) | December 31, 2025 |
| 9 | Vanguard MStar Small Cap Value Index | 0.37% | 468K | $29.6M | +19 (+0.0%) | September 30, 2026 |
| 10 | DFA US Small Cap Value I | 0.33% | 422K | $26.7M | +42,543 (+11.2%) | August 31, 2026 |
| 11 | Brandes US Value A Euro | 0.28% | 359K | $22.7M | −22,549 (−5.9%) | September 30, 2026 |
| 12 | ProShares S&P MidCap 400 Dividend Arst | 0.27% | 351K | $22.2M | — | September 30, 2026 |
| 13 | DFA US Targeted Value I | 0.26% | 335K | $21.2M | +27,792 (+9.0%) | August 31, 2026 |
| 14 | Dimensional US Small Cap Value ETF | 0.24% | 312K | $19.8M | +282 (+0.1%) | September 24, 2026 |
| 15 | Dimensional US Targeted Value ETF | 0.23% | 288K | $18.2M | +133 (+0.0%) | September 30, 2026 |
| 16 | State Street® SPDR® S&P® Dividend ETF | 0.23% | 288K | $18.2M | — | September 30, 2026 |
| 17 | State Street® SPDR® S&P MIDCAP 400® ETF | 0.19% | 246K | $15.6M | +2,062 (+0.8%) | September 30, 2026 |
| 18 | Nuveen Mid Cap Value R6 | 0.18% | 233K | $14.7M | — | August 31, 2026 |
| 19 | BlackRock Global Equity Mkt Netrl Instl | 0.17% | 211K | $13.4M | +24,998 (+13.4%) | July 31, 2026 |
| 20 | Orbis OEIC Global Balanced Fixed Fee | 0.16% | 208K | $13.2M | +38,795 (+22.9%) | March 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
WLK insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-27 | Mark Steven Bender | Sell | $100.92 | 17,409 | $1.8M |
| 2025-12-22 | Albert Chao | Sell | $73.57 | 40,836 | $3.0M |
| 2025-05-27 | Robert F Buesinger | Sell | $72.70 | 83 | $6,034 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
WLK shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns WLK
Institutional investors own 31.6% of Westlake's shares and insiders 74.51%. The largest holder is BlackRock Inc with 2.58% of the shares (3.3M), as of June 30, 2026. Among the top 20 institutions, 11 added shares and 9 reduced their stake in the latest filings. Short interest is 14.95% of the float, or 6.82 days of average trading volume. The share count fell 3.6% since 2014.
Related: WLK analyst forecast, WLK key metrics, WLK dividend history. See the WLK stock overview for the latest quote and news.
WLK ownership FAQ
Who owns the most Westlake stock?
The largest shareholders of Westlake are BlackRock Inc (2.58%), Capital World Investors (2.22%), T. Rowe Price Associates, Inc. (1.73%), Orbis Allan Gray Ltd (1.63%), Dimensional Fund Advisors, Inc. (1.61%).
What percentage of Westlake is owned by institutions?
Institutions hold 31.6% of Westlake's shares outstanding; insiders hold 74.51%.
Which funds own Westlake?
The largest fund holders of Westlake are iShares Core S&P Mid-Cap ETF (0.93%), T. Rowe Price Mid-Cap Value (0.87%), Global X US Infrastructure Dev ETF (0.82%), Vanguard MStar Total Stk Mkt Idx Invest (0.80%), Vanguard Small Cap Index (0.56%).
What is Westlake's short interest?
4.9M shares of Westlake were sold short, 14.95% of the float; at the average daily volume it would take 6.82 days to cover.
Are insiders buying or selling Westlake?
Of the latest 3 reported insider transactions in Westlake (since May 27, 2025), 0 were purchases and 3 were sales.
How many shares of Westlake are outstanding?
Westlake has 127.8M shares outstanding, of which 33.2M are in the public float.