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WLK Insider Trading

Insider Ownership Percentage: 1.40%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $7,881,945.24

Westlake Insider Trading History Chart

This chart shows the insider buying and selling history at Westlake by year and by quarter.

Skip ChartChart Data in Insider Trading History Table

Westlake Share Price & Price History

Current Price: $69.13
Price Change: ▼ Price Decrease of -1.437 (-2.04%)
As of 09/18/2026 03:59 PM ET

This chart shows the closing price history over time for WLK up to the past year.

Skip Chart and Table DataPrice Data in Insider Trading History Table
Days: 30 | 90 | 365

Westlake Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
8/11/2026Albert ChaoChairmanSell38,873$80.28$3,120,724.44642,880View SEC Filing Icon  
2/27/2026Mark Steven BenderCFOSell17,409$100.92$1,756,916.2844,433View SEC Filing Icon  
12/22/2025Albert ChaoChairmanSell40,836$73.57$3,004,304.52627,722View SEC Filing Icon  
5/27/2025Robert F BuesingerEVPSell83$72.70$6,034.1034,932View SEC Filing Icon  
4/22/2025Robert F BuesingerEVPBuy83$93.39$7,751.3783View SEC Filing Icon  
11/29/2024David Tsung-Hung ChaoDirectorSell1,750$129.08$225,890.007,784View SEC Filing Icon  
11/22/2024David Tsung-Hung ChaoDirectorSell1,750$130.00$227,500.009,534View SEC Filing Icon  
5/3/2024Mark Steven BenderCFOSell4,950$152.19$753,340.5040,356View SEC Filing Icon  
3/15/2024Robert F BuesingerEVPSell3,878$144.50$560,371.0021,144View SEC Filing Icon  
3/13/2024Robert F BuesingerEVPSell122$144.50$17,629.0025,022View SEC Filing Icon  
3/6/2024Mark Steven BenderCFOSell4,804$141.02$677,460.0845,306View SEC Filing Icon  
2/26/2024Mark Steven BenderCFOSell4,854$137.57$667,764.7850,110View SEC Filing Icon  
11/15/2023Robert F BuesingerEVPSell4,215$130.50$550,057.5016,754View SEC Filing Icon  
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SEC Filings (Institutional Ownership Changes) for Westlake (NYSE:WLK)

28.40% of Westlake stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at WLK by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

Westlake Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
9/9/2026Core Capital Management & Research inc.3,339$0.26M0.1%N/A0.003%Search for SEC Filing on Google Icon
9/9/2026Tidal Investments LLC76,055$5.55M0.0%+59.0%0.060%Search for SEC Filing on Google Icon
9/9/2026Engineers Gate Manager LP71,301$5.21M0.1%+67.8%0.056%Search for SEC Filing on Google Icon
9/9/2026IFP Advisors Inc1,171$85K0.0%+58,450.0%0.001%Search for SEC Filing on Google Icon
9/9/2026Squarepoint Ops LLC79,967$5.84M0.0%+107.5%0.063%Search for SEC Filing on Google Icon
9/8/2026Allworth Financial LP3,054$0.22M0.0%+79.5%0.002%Search for SEC Filing on Google Icon
9/8/2026Arizona State Retirement System8,836$0.65M0.0%-16.5%0.007%Search for SEC Filing on Google Icon
9/8/2026Nykredit A S948$69K0.0%N/A0.001%Search for SEC Filing on Google Icon
8/27/2026Corient Private Wealth LP8,143$0.59M0.0%-76.7%0.006%Search for SEC Filing on Google Icon
8/23/2026HB Wealth Management LLC2,768$0.20M0.0%N/A0.002%Search for SEC Filing on Google Icon
8/22/2026AlphaGrep UK Ltd12,289$0.90M0.3%N/A0.010%Search for SEC Filing on Google Icon
8/21/2026AXQ Capital LP51,437$3.76M0.4%N/A0.040%Search for SEC Filing on Google Icon
8/21/2026Nykredit A S948$69K0.0%N/A0.001%Search for SEC Filing on Google Icon
8/20/2026Two Sigma Securities LLC6,190$0.45M0.0%N/A0.005%Search for SEC Filing on Google Icon
8/19/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC817,207$59.66M0.0%-16.7%0.639%Search for SEC Filing on Google Icon
8/19/2026Hsbc Holdings PLC23,272$1.70M0.0%N/A0.018%Search for SEC Filing on Google Icon
8/19/2026Wellington Management Group LLP141,816$10.35M0.0%-92.1%0.111%Search for SEC Filing on Google Icon
8/18/2026Kimelman & Baird LLC1,500$0.11M0.0%N/A0.001%Search for SEC Filing on Google Icon
8/18/2026Public Employees Retirement System of Ohio9,392$0.69M0.0%N/A0.007%Search for SEC Filing on Google Icon
8/17/2026Capstone Investment Advisors LLC4,721$0.35M0.0%N/A0.004%Search for SEC Filing on Google Icon
8/17/2026Transamerica Financial Advisors LLC1,095$80K0.0%N/A0.001%Search for SEC Filing on Google Icon
8/17/2026Corient Private Wealth LP5,951$0.43M0.0%N/A0.005%Search for SEC Filing on Google Icon
8/17/2026Bank of America Corp DE232,213$16.95M0.0%N/A0.182%Search for SEC Filing on Google Icon
8/15/2026Freestone Grove Partners LP27,248$1.99M0.0%N/A0.021%Search for SEC Filing on Google Icon
8/15/2026Odyssean LLC2,903$0.21M0.0%N/A0.002%Search for SEC Filing on Google Icon
8/15/2026Man Group plc25,705$1.88M0.0%N/A0.020%Search for SEC Filing on Google Icon
8/15/2026Jupiter Topco LLC267,748$19.54M0.0%N/A0.210%Search for SEC Filing on Google Icon
8/14/2026Hsbc Holdings PLC23,272$1.70M0.0%N/A0.018%Search for SEC Filing on Google Icon
8/14/2026PDT Partners LLC75,777$5.53M0.3%N/A0.059%Search for SEC Filing on Google Icon
8/14/2026Canada Pension Plan Investment Board14,210$1.04M0.0%N/A0.011%Search for SEC Filing on Google Icon
8/14/2026Legal & General Group Plc50,025$3.65M0.0%N/A0.039%Search for SEC Filing on Google Icon
8/14/2026The Manufacturers Life Insurance Company37,155$2.71M0.0%N/A0.029%Search for SEC Filing on Google Icon
8/14/2026Thomist Capital Management LP96,200$7.02M2.2%N/A0.075%Search for SEC Filing on Google Icon
8/13/2026Sanctuary Advisors LLC4,985$0.36M0.0%N/A0.004%Search for SEC Filing on Google Icon
8/13/2026Meiji Yasuda Asset Management Co Ltd.82,778$6.04M0.3%N/A0.065%Search for SEC Filing on Google Icon
8/12/2026Quantbot Technologies LP15,303$1.12M0.0%N/A0.012%Search for SEC Filing on Google Icon
8/12/2026Farringdon Capital Ltd.4,583$0.34M0.2%N/A0.004%Search for SEC Filing on Google Icon
8/12/2026Landscape Capital Management L.L.C.3,072$0.22M0.0%N/A0.002%Search for SEC Filing on Google Icon
8/12/2026Ieq Capital LLC6,267$0.46M0.0%N/A0.005%Search for SEC Filing on Google Icon
8/11/2026Allworth Financial LP3,054$0.22M0.0%N/A0.002%Search for SEC Filing on Google Icon
8/10/2026Robotti Robert235,379$17.18M2.8%N/A0.184%Search for SEC Filing on Google Icon
8/7/2026BlackRock Inc.3,294,162$240.47M0.0%N/A2.571%Search for SEC Filing on Google Icon
8/7/2026Deutsche Bank AG2,169$0.16M0.0%N/A0.002%Search for SEC Filing on Google Icon
8/7/2026Mitsubishi UFJ Asset Management Co. Ltd.16,907$1.23M0.0%N/A0.013%Search for SEC Filing on Google Icon
8/6/2026Alberta Investment Management Corp89,200$6.51M0.0%N/A0.070%Search for SEC Filing on Google Icon
8/6/2026Bank of New York Mellon Corp163,455$11.93M0.0%N/A0.128%Search for SEC Filing on Google Icon
8/6/2026Focus Partners Advisor Solutions LLC3,912$0.29M0.0%N/A0.003%Search for SEC Filing on Google Icon
8/6/2026GSA Capital Partners LLP6,310$0.46M0.0%N/A0.005%Search for SEC Filing on Google Icon
8/3/2026Walleye Capital LLC82,847$6.05M0.0%N/A0.065%Search for SEC Filing on Google Icon
7/10/2026Handelsbanken Fonder AB8,000$0.58M0.0%-10.1%0.006%Search for SEC Filing on Google Icon
7/8/2026Assenagon Asset Management S.A.55,289$4.04M0.0%N/A0.043%Search for SEC Filing on Google Icon
6/18/2026Pacer Advisors Inc.3,844$0.45M0.0%-3.6%0.003%Search for SEC Filing on Google Icon
6/16/2026Empowered Funds LLC2,162$0.25M0.0%-23.4%0.002%Search for SEC Filing on Google Icon
5/19/2026Bank of America Corp DE236,986$27.69M0.0%+28.5%0.185%Search for SEC Filing on Google Icon
5/19/2026Edgestream Partners L.P.17,681$2.07M0.1%+149.2%0.014%Search for SEC Filing on Google Icon
5/19/2026Janus Henderson Group PLC269,783$31.52M0.0%-19.4%0.211%Search for SEC Filing on Google Icon
5/18/2026Amundi1,997$0.23M0.0%N/A0.002%Search for SEC Filing on Google Icon
5/18/2026California State Teachers Retirement System44,459$5.19M0.0%+23.2%0.035%Search for SEC Filing on Google Icon
5/18/2026Royal Bank of Canada103,951$12.14M0.0%+21.9%0.081%Search for SEC Filing on Google Icon
5/18/2026Recurrent Investment Advisors LLC112,790$13.18M0.8%+49.1%0.088%Search for SEC Filing on Google Icon
5/18/2026Rokos Capital Management LLP60,800$7.10M0.1%N/A0.047%Search for SEC Filing on Google Icon
5/18/2026Empowered Funds LLC2,162$0.25M0.0%-23.4%0.002%Search for SEC Filing on Google Icon
5/16/2026The Manufacturers Life Insurance Company33,295$3.89M0.0%-0.5%0.026%Search for SEC Filing on Google Icon
5/16/2026Quantinno Capital Management LP121,444$14.19M0.0%+4.4%0.095%Search for SEC Filing on Google Icon
5/16/2026SummitTX Capital L.P.14,335$1.68M0.1%N/A0.011%Search for SEC Filing on Google Icon
5/14/2026Gamco Investors INC. ET AL3,491$0.41M0.0%-11.4%0.003%Search for SEC Filing on Google Icon
5/14/2026Public Employees Retirement System of Ohio9,724$1.14M0.0%-3.3%0.008%Search for SEC Filing on Google Icon
5/14/2026Sei Investments Co.12,769$1.49M0.0%-55.1%0.010%Search for SEC Filing on Google Icon
5/13/2026Cetera Investment Advisers3,921$0.46M0.0%+24.3%0.003%Search for SEC Filing on Google Icon
5/13/2026First Trust Advisors LP102,299$11.95M0.0%-30.1%0.080%Search for SEC Filing on Google Icon
5/8/2026PNC Financial Services Group Inc.1,522$0.18M0.0%+14.0%0.001%Search for SEC Filing on Google Icon
5/7/2026Dimensional Fund Advisors LP1,466,020$171.26M0.0%-22.3%1.145%Search for SEC Filing on Google Icon
5/7/2026Parallel Advisors LLC830$97K0.0%+133.8%0.001%Search for SEC Filing on Google Icon
5/7/2026KBC Group NV19,432$2.27M0.0%-12.6%0.015%Search for SEC Filing on Google Icon
5/6/2026California Public Employees Retirement System25,000$2.92M0.0%-46.5%0.020%Search for SEC Filing on Google Icon
5/6/2026Allspring Global Investments Holdings LLC285,434$33.28M0.1%-43.7%0.223%Search for SEC Filing on Google Icon
5/5/2026Bank of New York Mellon Corp181,070$21.15M0.0%+3.9%0.141%Search for SEC Filing on Google Icon
5/5/2026Sanctuary Advisors LLC3,272$0.38M0.0%-4.9%0.003%Search for SEC Filing on Google Icon
5/5/2026Maryland State Retirement & Pension System1,915$0.22M0.0%N/A0.001%Search for SEC Filing on Google Icon
5/4/2026AMG National Trust Bank23,041$2.69M0.1%-1.2%0.018%Search for SEC Filing on Google Icon
5/4/2026Archer Investment Corp2,493$0.29M0.1%N/A0.002%Search for SEC Filing on Google Icon
5/4/2026State of Michigan Retirement System8,000$0.94M0.0%+1.3%0.006%Search for SEC Filing on Google Icon
5/4/2026Principal Financial Group Inc.74,481$8.70M0.0%+3.9%0.058%Search for SEC Filing on Google Icon
5/4/2026Teachers Retirement System of The State of Kentucky178,160$20.81M0.2%+7.8%0.139%Search for SEC Filing on Google Icon
5/1/2026Fifth Third Bancorp16,045$1.87M0.0%+2,755.0%0.013%Search for SEC Filing on Google Icon
4/30/2026Oregon Public Employees Retirement Fund6,868$0.80M0.0%+3.0%0.005%Search for SEC Filing on Google Icon
4/27/2026New York State Teachers Retirement System4,143$0.48M0.0%-20.7%0.003%Search for SEC Filing on Google Icon
4/24/2026Deprince Race & Zollo Inc.203,366$23.76M0.4%-0.4%0.159%Search for SEC Filing on Google Icon
4/23/2026Inspire Investing LLC2,836$0.33M0.0%-35.6%0.002%Search for SEC Filing on Google Icon
4/22/2026Sterling Capital Management LLC1,122$0.13M0.0%-43.2%0.001%Search for SEC Filing on Google Icon
4/21/2026Louisiana State Employees Retirement System9,700$1.13M0.0%N/A0.008%Search for SEC Filing on Google Icon
4/16/2026SG Americas Securities LLC24,576$2.87M0.0%-33.6%0.019%Search for SEC Filing on Google Icon
4/16/2026BI Asset Management Fondsmaeglerselskab A S42,043$4.91M0.1%+497.5%0.033%Search for SEC Filing on Google Icon
3/17/2026Rockefeller Capital Management L.P.955$71K0.0%+219.4%0.001%Search for SEC Filing on Google Icon
3/9/2026Corient Private Wealth LLC50,715$3.75M0.0%+53.6%0.040%Search for SEC Filing on Google Icon
2/24/2026Pacer Advisors Inc.3,988$0.30M0.0%-33.6%0.003%Search for SEC Filing on Google Icon
2/19/2026Invesco Ltd.213,157$15.76M0.0%+58.2%0.166%Search for SEC Filing on Google Icon
2/19/2026Corient Private Wealth LLC50,715$3.75M0.0%+53.6%0.040%Search for SEC Filing on Google Icon
2/19/2026Alberta Investment Management Corp19,700$1.46M0.0%N/A0.015%Search for SEC Filing on Google Icon
2/18/2026Alpine Woods Capital Investors LLC8,989$0.67M0.2%N/A0.007%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
Westlake logo
Westlake Corporation engages in the manufacture and marketing of performance and essential materials, and housing and infrastructure products in the United States, Canada, Germany, China, Mexico, Brazil, France, Italy, Taiwan, and internationally. The company operates through two segments: Performance and Essential Materials and Housing and Infrastructure Products. The Performance and Essential Materials segment offers ethylene, polyethylene, styrene, chlorinated derivative products, ethylene dichloride, vinyl chloride monomer, polyvinyl chloride (PVC), epoxy specialty resins, and base epoxy resins and intermediaries, as well as chlor-alkali, such as chlorine and caustic soda. The Housing and Infrastructure Products segment provides residential PVC sidings; PVC trim and mouldings; architectural stone veneers; windows; PVC decking; PVC films for various inflatables, wallcovering, and tape and roofing applications; polymer composite and cement roof tiles; PVC pipes and fittings for various water, sewer, electrical, and industrial applications; PVC compounds used in various housing, medical, and automobile products; and consumer and commercial products, such as landscape edging; industrial, home, and office matting; marine dock edging; and masonry joint controls. It offers its products to chemical processors, plastics fabricators, small construction contractors, municipalities, and supply warehouses for use in various consumer and industrial markets, including residential construction, flexible and rigid packaging, automotive products, healthcare products, water treatment, wind turbines, and coatings, as well as other durable and non-durable goods. The company was formerly known as Westlake Chemical Corporation and changed its name to Westlake Corporation in February 2022. Westlake Corporation was founded in 1986 and is headquartered in Houston, Texas. Westlake Corporation operates as a subsidiary of TTWF LP.
Read More on Westlake

Today's Range

Now: $69.13
Low: $68.74
High: $70.07

50 Day Range

MA: $75.24
Low: $68.86
High: $80.78

52 Week Range

Now: $69.13
Low: $56.33
High: $124.23

Volume

721,353 shs

Average Volume

639,146 shs

Market Capitalization

$8.84 billion

P/E Ratio

N/A

Dividend Yield

3.09%

Beta

0.63

Who are the company insiders with the largest holdings of Westlake?

Westlake's top insider investors include:
  1. Albert Chao (Chairman)
  2. Albert Chao (CEO)
  3. James Chao (Chairman)
  4. Mark Steven Bender (CFO)
  5. Dorothy C Jenkins (Director)
  6. George J Mangieri (VP)
  7. Mark Steven Bender (VP)
  8. L Benjamin Ederington (CAO)
  9. Robert F Buesinger (EVP)
  10. Roger L Kearns (COO)
Learn More about top insider investors at Westlake.

Who are the major institutional investors of Westlake?

Westlake's top institutional shareholders include:
  1. BlackRock Inc. — 2.57%
  2. UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC — 0.64%
  3. Jupiter Topco LLC — 0.21%
  4. Robotti Robert — 0.18%
  5. Bank of America Corp DE — 0.18%
  6. Bank of New York Mellon Corp — 0.13%
Learn More about top institutional investors of Westlake stock.

Which institutional investors are selling Westlake stock?

Within the last quarter, WLK stock was sold by these institutional investors:
  1. Wellington Management Group LLP
  2. UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
  3. Corient Private Wealth LP
  4. California State Teachers Retirement System
  5. Arizona State Retirement System
  6. Handelsbanken Fonder AB
In the last year, company insiders that have sold Westlake company stock include:
  1. Albert Chao (Chairman)
  2. Mark Steven Bender (CFO)
Learn More investors selling Westlake stock.

Which institutional investors are buying Westlake stock?

During the previous quarter, WLK stock was purchased by institutional investors including:
  1. BlackRock Inc.
  2. Jupiter Topco LLC
  3. Robotti Robert
  4. Bank of America Corp DE
  5. Bank of New York Mellon Corp
  6. Thomist Capital Management LP
  7. Alberta Investment Management Corp
  8. Walleye Capital LLC

Westlake Active Insiders

Lawrence E Teel
Lawrence E Teel
CEO
Albert Chao
Albert Chao (Age 76)
CEO
1 recent trades
Roger L Kearns
Roger L Kearns (Age 63)
COO
Mark Steven Bender
Mark Steven Bender (Age 69)
CFO
Johnathan Stevan Zoeller
Johnathan Stevan Zoeller (Age 50)
CAO
L. Benjamin Ederington
L. Benjamin Ederington (Age 54)
CAO
David Tsung-Hung Chao
David Tsung-Hung Chao
Director
Robert F Buesinger
Robert F Buesinger (Age 69)
EVP
Andrew Kenner
Andrew Kenner
SVP