Westlake Ownership | Who Owns Westlake?

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Westlake Ownership Summary

Westlake is owned by 31.28% institutional investors, 74.51% insiders. 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	31.28%	74.51%	-5.79%
Sector	Basic Materials Stocks	58.82%	12.62%	28.56%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	3.92M	3.05%	$289.65M
Blackrock	3.41M	2.65%	$493.55M
Blackrock funding, inc. /de	3.29M	2.57%	$240.47M
Capital world investors	2.84M	2.22%	$207.49M
Price t rowe associates inc /md/	2.21M	1.72%	$161.09M
Orbis allan gray	2.08M	1.63%	$152.16M
Dimensional fund advisors lp	2.05M	1.60%	$149.78M
Brandes investment partners, lp	1.57M	1.23%	$114.83M
Aqr capital management	1.57M	1.23%	$114.64M
Vanguard capital management	1.46M	1.14%	$106.89M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Robotti robert	235.38K	2.77%	$17.18M
Thomist capital management, lp	96.20K	2.23%	$7.02M
Walnut level capital	10.00K	0.99%	$1.17M
Brandes investment partners, lp	1.57M	0.81%	$114.83M
Recurrent investment advisors	128.77K	0.58%	$9.40M
Campbell & co investment adviser	148.18K	0.57%	$10.82M
Orbis allan gray	2.08M	0.52%	$152.16M
Deprince race & zollo	203.37K	0.45%	$23.76M
Axq capital, lp	51.44K	0.41%	$3.75M
Sprott	160.11K	0.37%	$11.69M

Top Buyers

Holder	Shares	% Assets	Change
Aqr capital management	1.57M	0.04%	1.31M
Dimensional fund advisors lp	2.05M	0.03%	585.53K
Vanguard group	3.92M	0.00%	477.70K
Caisse de depot et placement du quebec	368.32K	0.05%	368.32K
Jacobs levy equity management	709.36K	0.19%	360.32K

Top Sellers

Holder	Shares	% Assets	Change
Orbis allan gray	2.08M	0.52%	-3.21M
Wellington management group llp	141.82K	0.00%	-1.65M
Capital world investors	2.84M	0.02%	-1.37M
Fmr	361.24K	0.00%	-951.23K
Holocene advisors, lp	-	-	-730.03K

New Positions

Holder	Shares	% Assets	Change	Value
Caisse de depot et placement du quebec	368.32K	0.05%	368.32K	$28.38M
Qube research	321.72K	0.02%	321.72K	$23.49M
Sixth street partners management company	318.82K	0.00%	318.82K	$23.27M
Norges bank	214.10K	0.00%	214.10K	$15.63M
Campbell & co investment adviser	148.18K	0.57%	148.18K	$10.82M

Sold Out

Holder	Change
Bartlett & co. wealth management	-1.00
Tfc financial management	-1.00
Financial management professionals	-2.00
Tfo-tdc	-2.00
New millennium group	-2.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	363	3.42%	40,031,027	-9.24%	31	2.67%	195	-6.25%	120	36.36%
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%

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
American Funds Income Fd of Amer A	2.46M	1.92%	-
Vanguard Wellington Inv	1.41M	1.10%	-329.83K
Capital Group Fundamental Invtrs Comp	1.27M	0.99%	-3.48K
American Funds Fundamental Invs A	1.27M	0.99%	-3.48K
Orbis Global Equity Investor	1.25M	0.97%	181.61K
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
Aug 11, 2026	Chao Albert	Executive Chairman	Sell	$596.87K
Aug 11, 2026	Chao Albert	Executive Chairman	Sell	$2.52M
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	$1.71M

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	2
2026 Q2	-	-
2026 Q1	-	4
2025 Q4	-	3
2025 Q3	-	-

WLK Ownership FAQ

Who owns the most shares of Westlake?

Westlake’s largest shareholders are Vanguard group (3.92M shares, 3.05%), Blackrock (3.41M shares, 2.65%), and Blackrock funding, inc. /de (3.29M shares, 2.57%). Together, they hold 8.28% 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?

Robotti robert is Westlake’s biggest shareholder by percentage of total assets invested, with 2.77% of its assets in 235.38K Westlake shares, valued at 17.18M$.

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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