Westlake Ownership | Who Owns Westlake?

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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	32.98%	12.17%	54.85%

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
Hite hedge asset management	100.00K	0.42%	$7.71M

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
Tfo-tdc	-2.00
New millennium group	-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	2.16M	1.68%	2.16M
Vanguard Wellington Inv	1.74M	1.36%	1.74M
Capital Group Fundamental Invtrs Comp	1.27M	0.99%	-3.48K
American Funds Fundamental Invs A	1.27M	0.99%	-3.48K
Vanguard Total Stock Mkt Idx Inv	1.23M	0.96%	3.90K
Vanguard US Total Market Shares ETF	1.23M	0.96%	1.02K
T. Rowe Price Mid-Cap Value	1.22M	0.95%	-
T. Rowe Price US Mid-Cap Value Equity	1.22M	0.95%	-4.02K
iShares Core S&P Mid-Cap ETF	1.08M	0.84%	56.86K

Recent Insider Transactions

Date	Name	Role	Activity	Value
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	$2.26M
Dec 22, 2025	Chao Albert	Executive Chairman	Sell	$707.14K
Dec 22, 2025	Chao Albert	Executive Chairman	Sell	$38.78K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	-
2025 Q4	-	3
2025 Q3	-	-
2025 Q2	1	1
2025 Q1	-	-

WLK Ownership FAQ

Who owns the most shares of Westlake?

Westlake’s largest shareholders are Vanguard group (3.92M shares, 3.05%), Orbis allan gray (3.91M shares, 3.05%), and Blackrock (3.41M shares, 2.65%). Together, they hold 8.76% 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?

Lloyd harbor capital management is Westlake’s biggest shareholder by percentage of total assets invested, with 3.30% of its assets in 110K Westlake shares, valued at 8.48M$.

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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