Westlake Ownership | Who Owns Westlake?
Westlake Ownership Summary
Westlake is owned by 21.60% institutional investors, 74.16% insiders, and 4.24% retail investors. Vanguard group is the largest institutional shareholder, holding 3.05% 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 | 21.60% | 74.16% | 4.24% |
| Sector | Basic Materials Stocks | 33.12% | 12.20% | 54.68% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Vanguard group | 3.92M | 3.05% | $289.65M |
| Orbis allan gray | 3.91M | 3.05% | $301.64M |
| Blackrock | 3.41M | 2.65% | $493.55M |
| Blackrock funding, inc. /de | 3.26M | 2.54% | $241.15M |
| Victory capital management | 2.87M | 2.23% | $220.88M |
| Price t rowe associates inc /md/ | 2.21M | 1.72% | $170.16M |
| Capital world investors | 2.17M | 1.69% | $160.55M |
| Dimensional fund advisors lp | 1.89M | 1.47% | $139.43M |
| Brandes investment partners, lp | 1.67M | 1.30% | $123.50M |
| State street | 1.30M | 1.01% | $99.81M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Lloyd harbor capital management | 110.00K | 3.30% | $8.48M |
| Robotti robert | 256.24K | 2.67% | $18.95M |
| Walnut level capital | 57.68K | 2.66% | $4.44M |
| Orbis allan gray | 3.91M | 1.29% | $301.64M |
| Brandes investment partners, lp | 1.67M | 0.94% | $123.50M |
| Thomist capital management, lp | 46.20K | 0.70% | $3.56M |
| Thompson siegel & walmsley | 536.29K | 0.67% | $39.65M |
| Antipodes partners | 416.52K | 0.65% | $30.80M |
| Merewether investment management, lp | 268.40K | 0.49% | $20.68M |
| Deprince race & zollo | 203.37K | 0.45% | $23.76M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Orbis allan gray | 3.91M | 1.29% | 3.91M |
| Capital world investors | 2.17M | 0.02% | 2.17M |
| Holocene advisors, lp | 854.18K | 0.15% | 696.03K |
| Dimensional fund advisors lp | 1.89M | 0.03% | 585.44K |
| Vanguard group | 3.92M | 0.00% | 477.70K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Fmr | 314.35K | 0.00% | -1.30M |
| Victory capital management | 2.87M | 0.13% | -855.38K |
| Balyasny asset management | 79.85K | 0.01% | -442.03K |
| Bank of america corp /de/ | - | - | -403.20K |
| Engineers gate manager lp | - | - | -351.01K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Orbis allan gray | 3.91M | 1.29% | 3.91M | $301.64M |
| Capital world investors | 2.17M | 0.02% | 2.17M | $160.55M |
| Caisse de depot et placement du quebec | 368.32K | 0.05% | 368.32K | $28.38M |
| Merewether investment management, lp | 268.40K | 0.49% | 268.40K | $20.68M |
| Diamond hill capital management | 190.18K | 0.07% | 190.18K | $14.06M |
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 % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Dec 31, 2024 | 190 | -54.33% | 15,823,842 | -52.43% | 12 | 1.84% | 85 | -60.65% | 66 | -45.45% |
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 | 1.74M | 1.36% | 1.74M |
| 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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