Westlake Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NYSE:WLK Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Role	Shares	Max Price
27 May 25	SellUS$6,034	Robert Buesinger	Individual		83	US$72.70
22 Apr 25	BuyUS$7,751	Robert Buesinger	Individual		83	US$93.39

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of WLK?
Owner Type	Number of Shares	Ownership Percentage
State or Government	20,035	0.0145%
Individual Insiders	1,151,580	0.835%
Institutions	43,370,973	31.4%
Private Companies	93,405,554	67.7%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 97.9% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
72.8%	TTWF LP	93,405,554	US$6.9b	0%	no data
3.05%	Orbis Investment Management Limited	3,914,411	US$291.2m	0%	0.71%
2.68%	The Vanguard Group, Inc.	3,439,631	US$255.8m	-2.36%	no data
2.48%	BlackRock, Inc.	3,185,736	US$237.0m	-4.29%	no data
2.23%	Victory Capital Management Inc.	2,866,360	US$213.2m	-23%	0.12%
1.72%	T. Rowe Price Group, Inc.	2,208,143	US$164.2m	7.26%	0.01%
1.21%	Brandes Investment Partners, LP	1,548,694	US$115.2m	6.3%	0.52%
1.15%	UBS Asset Management AG	1,477,753	US$109.9m	34.9%	0.01%
1.07%	Norges Bank Investment Management	1,373,816	US$102.2m	0%	0.01%
1.01%	Dimensional Fund Advisors LP	1,300,240	US$96.7m	1.97%	0.01%
1.01%	State Street Global Advisors, Inc.	1,295,242	US$96.3m	-6.97%	no data
0.94%	Citadel Advisors LLC	1,200,851	US$89.3m	9,660%	0.07%
0.7%	Goldman Sachs Asset Management, L.P.	903,973	US$67.2m	-4.16%	0.01%
0.67%	Jacobs Levy Equity Management Inc	860,723	US$64.0m	-12.6%	0.24%
0.67%	Mirae Asset Global Investments Co., Ltd.	855,976	US$63.7m	1.4%	0.04%
0.67%	Holocene Advisors, LP	854,184	US$63.5m	440%	0.14%
0.51%	Geode Capital Management, LLC	653,086	US$48.6m	13.7%	no data
0.49%	Albert Chao	627,722	US$46.7m	-45%	no data
0.48%	Teachers Insurance and Annuity Association-College Retirement Equities Fund	618,042	US$46.0m	-24.4%	0.01%
0.43%	Antipodes Partners Ltd.	555,904	US$41.3m	-32.5%	0.8%
0.43%	Morgan Stanley	547,338	US$40.7m	244%	no data
0.43%	Allspring Global Investments, LLC	546,151	US$40.6m	4.88%	0.06%
0.37%	Balyasny Asset Management L.P.	475,743	US$35.4m	496%	0.07%
0.34%	Thompson, Siegel & Walmsley LLC	441,340	US$32.8m	0%	0.37%
0.33%	ProShare Advisors LLC	422,640	US$31.4m	19%	0.06%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2025/12/30 08:39
End of Day Share Price	2025/12/29 00:00
Earnings	2025/09/30
Annual Earnings	2024/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Westlake Corporation is covered by 30 analysts. 14 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
null null	Alembic Global Advisors
Michael Leithead	Barclays
Jonas Oxgaard	Bernstein