Westlake Ownership | Who Owns Westlake?
Westlake Ownership Summary
Westlake is owned by 7.59% institutional investors, 74.31% insiders, and 18.10% retail investors. Orbis allan gray is the largest institutional shareholder, holding 4.11% of WLK shares. Sycamore Mid Cap Value Comp is the top mutual fund, with 2.20% of its assets in Westlake shares.
WLK Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Westlake | 7.59% | 74.31% | 18.10% |
| Sector | Basic Materials Stocks | 41.27% | 13.22% | 45.51% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Orbis allan gray | 5.29M | 4.11% | $618.39M |
| Capital world investors | 4.21M | 3.27% | $491.93M |
| Vanguard group | 3.92M | 3.05% | $289.65M |
| Blackrock | 3.41M | 2.65% | $493.55M |
| Blackrock funding, inc. /de | 3.08M | 2.39% | $359.70M |
| Price t rowe associates inc /md/ | 2.41M | 1.87% | $281.24M |
| Brandes investment partners, lp | 1.84M | 1.43% | $215.26M |
| Wellington management group llp | 1.79M | 1.39% | $209.52M |
| Dimensional fund advisors lp | 1.47M | 1.14% | $171.26M |
| Goldman sachs group | 1.39M | 1.08% | $162.77M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Lloyd harbor capital management | 62.00K | 2.96% | $7.24M |
| Robotti robert | 145.00K | 2.64% | $16.94M |
| Orbis allan gray | 5.29M | 2.61% | $618.39M |
| Thomist capital management, lp | 73.00K | 2.30% | $8.53M |
| Brandes investment partners, lp | 1.84M | 1.52% | $215.26M |
| Walnut level capital | 10.00K | 0.99% | $1.17M |
| Albar capital partners llp | 48.81K | 0.92% | $5.70M |
| Recurrent investment advisors | 112.79K | 0.79% | $13.18M |
| Total wealth planning & management | 7.71K | 0.66% | $900.33K |
| Ceredex value advisors | 177.90K | 0.65% | $20.78M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Capital world investors | 4.21M | 0.07% | 2.04M |
| Fmr | 1.31M | 0.01% | 1.08M |
| Orbis allan gray | 5.29M | 2.61% | 906.88K |
| Goldman sachs group | 1.39M | 0.02% | 639.37K |
| Citadel advisors | 715.59K | 0.01% | 512.28K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Wellington management group llp | 1.79M | 0.04% | -2.43M |
| Victory capital management | 45.58K | 0.00% | -1.07M |
| Thompson siegel & walmsley | 2.98K | 0.01% | -533.31K |
| Holocene advisors, lp | 730.03K | 0.21% | -490.59K |
| Dimensional fund advisors lp | 1.47M | 0.04% | -419.66K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Caisse de depot et placement du quebec | 368.32K | 0.05% | 368.32K | $28.38M |
| Vanguard fiduciary trust | 205.68K | 0.01% | 205.68K | $24.03M |
| Norges bank | 181.33K | 0.00% | 181.33K | $13.41M |
| Man group | 160.29K | 0.03% | 160.29K | $18.72M |
| Yaupon capital management lp | 107.04K | 0.39% | 107.04K | $12.50M |
Sold Out
| Holder | Change |
|---|---|
| Abound wealth management | -1.00 |
| Tfc financial management | -1.00 |
| New millennium group | -2.00 |
| Tfo-tdc | -2.00 |
| Financial management professionals | -2.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 31, 2026 | 167 | -46.13% | 9,784,624 | -78.91% | 7 | 0.58% | 94 | -39.35% | 39 | -66.38% |
| Dec 31, 2025 | 227 | -28.39% | 27,706,156 | -33.25% | 21 | 2.06% | 110 | -30.82% | 85 | -19.05% |
| Sep 30, 2025 | 299 | -6.56% | 40,470,785 | 2.90% | 31 | 3.36% | 149 | -13.87% | 101 | -2.88% |
| Jun 30, 2025 | 318 | -12.40% | 39,289,982 | 9.39% | 30 | 3.91% | 172 | -10.88% | 104 | -7.96% |
| Mar 31, 2025 | 360 | -6.98% | 35,844,546 | 1.79% | 27 | 3.73% | 191 | -0.52% | 113 | -12.40% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Sycamore Mid Cap Value Comp | 2.83M | 2.20% | 2.75M |
| American Funds Income Fund of Amer A | 2.46M | 1.92% | 301.96K |
| Vanguard Wellington Inv | 1.41M | 1.10% | -329.83K |
| T. Rowe Price Mid-Cap Value | 1.28M | 1.00% | 63.20K |
| T. Rowe Price US Mid-Cap Value Equity | 1.28M | 1.00% | 58.84K |
| Capital Group Fundamental Invtrs Comp | 1.27M | 0.99% | -3.48K |
| American Funds Fundamental Invs A | 1.27M | 0.99% | -3.48K |
| Capital Group New Perspective Comp | 1.23M | 0.96% | 1.23M |
| American Funds New Perspective A | 1.23M | 0.96% | 1.23M |
| Vanguard US Total Market Shares ETF | 1.23M | 0.96% | 1.02K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Mar 27, 2026 | Buesinger Robert F. | EVP, PEM Segment Head | Sell | $461.00K |
| Mar 27, 2026 | Bender Mark Steven | EVP & CFO | Sell | $1.85M |
| Feb 27, 2026 | Bender Mark Steven | EVP & CFO | Sell | $42.74K |
| Feb 27, 2026 | Bender Mark Steven | EVP & CFO | Sell | $1.71M |
| Dec 22, 2025 | Chao Albert | Executive Chairman | Sell | $707.14K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | - |
| 2026 Q1 | - | 4 |
| 2025 Q4 | - | 3 |
| 2025 Q3 | - | - |
| 2025 Q2 | 1 | 1 |
WLK Ownership FAQ
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