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	Shares	Max Price
27 Mar 26	SellUS$1,847,037	Mark Bender	Individual	16,413	US$112.54
27 Mar 26	SellUS$461,000	Robert Buesinger	Individual	4,000	US$115.25
27 Feb 26	SellUS$1,756,997	Mark Bender	Individual	17,409	US$101.52

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	38,433	0.0284%
Individual Insiders	1,657,372	1.22%
Institutions	40,221,452	29.7%
Private Companies	93,405,554	69%

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

Top Shareholders

Top 25 shareholders own 96.37% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
73.1%	TTWF LP	93,405,554	US$7.4b	0%	no data
2.58%	BlackRock, Inc.	3,294,162	US$259.7m	6.99%	no data
2.24%	Capital Research and Management Company	2,860,678	US$225.6m	-34.1%	0.01%
1.73%	T. Rowe Price Group, Inc.	2,206,676	US$174.0m	-8.34%	0.01%
1.63%	Orbis Investment Management Limited	2,084,364	US$164.4m	-60.6%	0.33%
1.61%	Dimensional Fund Advisors LP	2,051,554	US$161.8m	39.9%	0.02%
1.37%	Vanguard Portfolio Management, LLC	1,752,627	US$138.2m	-0.97%	0.01%
1.31%	Vanguard Capital Management, LLC	1,673,873	US$132.0m	0.76%	no data
1.23%	Brandes Investment Partners, LP	1,572,939	US$124.0m	-14.6%	0.47%
1.22%	AQR Capital Management, LLC	1,564,538	US$123.4m	505%	0.04%
1.14%	State Street Investment Management	1,453,407	US$114.6m	5.28%	no data
0.98%	UBS Asset Management AG	1,248,840	US$98.5m	-30.3%	0.01%
0.83%	Citadel Advisors LLC	1,054,868	US$83.2m	47.4%	0.05%
0.8%	Mirae Asset Global Investments Co., Ltd.	1,023,403	US$80.7m	8.41%	0.04%
0.59%	The Goldman Sachs Group, Inc.	759,762	US$59.9m	16.1%	0.01%
0.56%	Geode Capital Management, LLC	718,597	US$56.7m	17%	no data
0.56%	Jacobs Levy Equity Management Inc	709,355	US$55.9m	103%	0.19%
0.5%	Albert Chao	642,880	US$50.7m	-44.4%	no data
0.49%	Balyasny Asset Management L.P.	625,859	US$49.3m	69.3%	0.09%
0.41%	Goldman Sachs Asset Management, L.P.	521,111	US$41.1m	-29.3%	0.01%
0.35%	Woodline Partners LP	451,986	US$35.6m	34.1%	0.11%
0.31%	Millennium Management LLC	397,278	US$31.3m	284%	0.02%
0.29%	Schroder Investment Management North America Inc.	375,889	US$29.6m	0.37%	0.07%
0.28%	FMR LLC	358,440	US$28.3m	-72.6%	no data
0.27%	Teachers Insurance and Annuity Association-College Retirement Equities Fund	347,378	US$27.4m	-28%	0.01%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/08/21 22:41
End of Day Share Price	2026/08/21 00:00
Earnings	2026/06/30
Annual Earnings	2025/12/31

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 25 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