Westlake Ownership | Who Owns Westlake?


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Westlake Ownership Summary


Westlake is owned by 30.63% institutional investors, 74.23% insiders. Vanguard group is the largest institutional shareholder, holding 3.01% 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


TypeName% Inst% Insiders% Retail
StockWestlake30.63%74.23%-4.86%
SectorBasic Materials Stocks 52.55%12.25%35.20%

Institutional Shareholders


Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Vanguard group3.88M3.01%$444.61M
Blackrock3.41M2.65%$493.55M
Blackrock funding, inc. /de3.33M2.60%$252.75M
Victory capital management3.31M2.58%$379.93M
Brandes investment partners, lp1.46M1.14%$110.62M
Fmr1.44M1.12%$164.94M
State street1.19M0.93%$172.17M
Nuveen asset management983.09K0.76%$112.71M
Goldman sachs group938.92K0.73%$107.65M
Dimensional fund advisors lp934.12K0.73%$107.09M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Jcp investment management53.00K2.32%$4.02M
Robotti robert182.84K2.31%$13.77M
Thomist capital management, lp71.60K2.03%$5.45M
Antipodes partners823.17K1.94%$62.51M
Brandes investment partners, lp1.46M1.00%$110.62M
Board of the pension protection fund9.50K0.72%$732.07K
Ilex capital partners (uk) llp273.56K0.69%$20.77M
Hite hedge asset management114.49K0.50%$8.69M
Sprott125.00K0.45%$9.49M
Victory capital management3.31M0.37%$379.93M

Top Buyers

HolderShares% AssetsChange
Brandes investment partners, lp1.46M1.00%1.04M
Antipodes partners823.17K1.94%823.17K
Victory capital management3.31M0.37%574.07K
Ubs group557.56K0.01%516.95K
Norges bank406.71K0.01%406.71K

Top Sellers

HolderShares% AssetsChange
Fmr1.44M0.01%-1.29M
Capital world investors---1.29M
Balyasny asset management79.85K0.01%-442.03K
Ilex capital partners (uk) llp273.56K0.69%-425.44K
Bank of america corp /de/---403.20K

New Positions

HolderShares% AssetsChangeValue
Antipodes partners823.17K1.94%823.17K$62.51M
Norges bank406.71K0.01%406.71K$46.63M
Arrowstreet capital, limited partnership290.04K0.02%290.04K$22.02M
Van lanschot kempen investment management182.90K0.13%182.90K$13.89M
Jacobs levy equity management74.48K0.04%74.48K$10.79M

Sold Out

HolderChange
Abound wealth management-1.00
Advisornet financial-1.00
Tfc financial management-1.00
Tfo-tdc-2.00
Financial management professionals-2.00

Institutional Ownership Trends


DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Jun 30, 2025318-12.40%39,289,9829.39%303.91%172-10.88%104-7.96%
Mar 31, 2025360-6.98%35,844,5461.79%273.73%191-0.52%113-12.40%
Dec 31, 2024190-54.33%15,823,842-52.43%121.84%85-60.65%66-45.45%
Sep 30, 20244125.10%33,223,108-1.86%253.71%21311.52%120-9.77%
Jun 30, 202438910.83%33,851,369-0.84%263.73%18913.17%13215.79%

Top Mutual Funds Shareholders


HolderShares% HoldingChange
Sycamore Mid Cap Value Comp2.83M2.20%2.75M
Victory Sycamore Established Value R2.69M2.09%-145.00K
Capital Group Fundamental Invtrs Comp1.27M0.99%-3.48K
American Funds Fundamental Invs A1.27M0.99%-3.48K
Vanguard US Total Market Shares ETF1.23M0.96%1.02K
T. Rowe Price Mid-Cap Value1.22M0.95%1.22M
iShares Core S&P Mid-Cap ETF1.09M0.85%-
Vanguard Total Stock Mkt Idx Inv1.00M0.78%-21.55K
Global X US Infrastructure Dev ETF806.27K0.63%440.00
Vanguard Small Cap Index778.20K0.61%-4.75K

Recent Insider Transactions


DateNameRoleActivityValue
May 27, 2025Buesinger Robert F. EVP, PEM Segment HeadSell$6.03K
Apr 22, 2025Buesinger Robert F. EVP, PEM Segment HeadBuy$7.75K
Nov 29, 2024Chao David Tsung-Hung-Sell$225.89K
Nov 22, 2024Chao David Tsung-Hung-Sell$227.50K
May 09, 2024Buesinger Robert F. EVP, HIP, IT & DigitalSell$554.75K

Insider Transactions Trends


DateBuySell
2025 Q4--
2025 Q3--
2025 Q211
2025 Q1--
2024 Q4-2

WLK Ownership FAQ


Who owns the most shares of Westlake?

Westlake’s largest shareholders are Vanguard group (3.88M shares, 3.01%), Blackrock (3.41M shares, 2.65%), and Blackrock funding, inc. /de (3.33M shares, 2.60%). Together, they hold 8.26% of Westlake’s total shares outstanding.

Does Blackrock own Westlake?

Yes, BlackRock owns 2.65% of Westlake, totaling 3.41M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 493.55M$. In the last quarter, BlackRock decreased its holdings by -71.816K shares, a -2.06% change.

Who is Westlake’s biggest shareholder by percentage of total assets invested?

Jcp investment management is Westlake’s biggest shareholder by percentage of total assets invested, with 2.32% of its assets in 53K Westlake shares, valued at 4.02M$.

Who is the top mutual fund holder of Westlake shares?

Sycamore Mid Cap Value Comp is the top mutual fund holder of Westlake shares, with 2.20% of its total shares outstanding invested in 2.83M Westlake shares.

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