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WLK Insider Trading

Insider Ownership Percentage: 1.30%
Insider Buying (Last 12 Months): $7,751.37
Insider Selling (Last 12 Months): $4,767,254.90

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: $108.56
Price Change: ▲ Price Increase of +2.438 (2.30%)
As of 03/23/2026 04:59 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
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  
8/23/2023David Tsung-Hung ChaoDirectorSell1,000$131.00$131,000.0010,148View SEC Filing Icon  
See Full Table

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
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
2/18/2026Mercer Global Advisors Inc. ADV3,923$0.29M0.0%-7.5%0.003%Search for SEC Filing on Google Icon
2/18/2026State of Tennessee Department of Treasury12,946$1.03M0.0%+158.2%0.010%Search for SEC Filing on Google Icon
2/18/2026Mackenzie Financial Corp19,833$1.48M0.0%-21.7%0.015%Search for SEC Filing on Google Icon
2/18/2026Empowered Funds LLC2,823$0.21M0.0%N/A0.002%Search for SEC Filing on Google Icon
2/18/2026VARCOV Co.35,597$2.63M1.0%N/A0.028%Search for SEC Filing on Google Icon
2/18/2026Voloridge Investment Management LLC348,953$25.80M0.1%-11.5%0.272%Search for SEC Filing on Google Icon
2/18/2026Virtus Investment Advisers LLC2,186$0.16M0.0%N/A0.002%Search for SEC Filing on Google Icon
2/18/2026Wellington Management Group LLP4,220,717$312.08M0.1%+7,239.1%3.290%Search for SEC Filing on Google Icon
2/18/2026Polymer Capital Management US LLC6,500$0.48M0.1%-59.9%0.005%Search for SEC Filing on Google Icon
2/18/2026Numerai GP LLC5,792$0.43M0.1%N/A0.005%Search for SEC Filing on Google Icon
2/18/2026Occudo Quantitative Strategies LP25,180$1.86M0.1%-8.1%0.020%Search for SEC Filing on Google Icon
2/18/2026Odyssean LLC2,903$0.22M0.2%N/A0.002%Search for SEC Filing on Google Icon
2/18/2026Millennium Management LLC427,754$31.63M0.0%+302.3%0.333%Search for SEC Filing on Google Icon
2/18/2026Inspire Investing LLC4,404$0.33M0.0%+10.3%0.003%Search for SEC Filing on Google Icon
2/18/2026Janus Henderson Group PLC334,593$24.74M0.0%-8.6%0.261%Search for SEC Filing on Google Icon
2/18/2026Gotham Asset Management LLC9,199$0.68M0.0%-58.3%0.007%Search for SEC Filing on Google Icon
2/18/2026Engineers Gate Manager LP289,255$21.39M0.3%N/A0.226%Search for SEC Filing on Google Icon
2/18/2026Aventail Capital Group LP27,764$2.05M0.1%-64.6%0.022%Search for SEC Filing on Google Icon
2/17/2026Guggenheim Capital LLC4,174$0.31M0.0%N/A0.003%Search for SEC Filing on Google Icon
2/17/2026Luminus Management LLC35,189$2.60M2.3%N/A0.027%Search for SEC Filing on Google Icon
2/17/2026Schonfeld Strategic Advisors LLC6,012$0.45M0.0%-86.9%0.005%Search for SEC Filing on Google Icon
2/17/2026PDT Partners LLC64,977$4.80M0.3%+232.9%0.051%Search for SEC Filing on Google Icon
2/17/2026AQR Capital Management LLC20,535$1.52M0.0%-60.9%0.016%Search for SEC Filing on Google Icon
2/17/2026Cetera Investment Advisers3,154$0.23M0.0%-32.6%0.002%Search for SEC Filing on Google Icon
2/17/2026Lazard Asset Management LLC74,428$5.50M0.0%+2.5%0.058%Search for SEC Filing on Google Icon
2/17/2026Jain Global LLC62,043$4.59M0.0%+399.7%0.048%Search for SEC Filing on Google Icon
2/17/2026iSAM Funds UK Ltd2,828$0.21M0.1%N/A0.002%Search for SEC Filing on Google Icon
2/17/2026Orbis Allan Gray Ltd4,386,635$324.35M1.4%+12.1%3.420%Search for SEC Filing on Google Icon
2/17/2026Jump Financial LLC17,600$1.30M0.0%-77.4%0.014%Search for SEC Filing on Google Icon
2/17/2026Sciencast Management LP15,619$1.16M0.2%N/A0.012%Search for SEC Filing on Google Icon
2/17/2026Price T Rowe Associates Inc. MD2,208,715$163.31M0.0%+0.0%1.722%Search for SEC Filing on Google Icon
2/17/2026Weiss Asset Management LP9,928$0.73M0.0%N/A0.008%Search for SEC Filing on Google Icon
2/17/2026Public Employees Retirement System of Ohio10,056$0.74M0.0%-3.7%0.008%Search for SEC Filing on Google Icon
2/17/2026California State Teachers Retirement System36,098$2.67M0.0%+1,628.0%0.028%Search for SEC Filing on Google Icon
2/17/2026State of Wisconsin Investment Board25,711$1.90M0.0%N/A0.020%Search for SEC Filing on Google Icon
2/17/2026ExodusPoint Capital Management LP154,391$11.42M0.1%N/A0.120%Search for SEC Filing on Google Icon
2/17/2026Royal Bank of Canada85,270$6.31M0.0%-77.7%0.066%Search for SEC Filing on Google Icon
2/17/2026Aster Capital Management DIFC Ltd820$61K0.0%N/A0.001%Search for SEC Filing on Google Icon
2/17/2026Alberta Investment Management Corp19,700$1.46M0.0%N/A0.015%Search for SEC Filing on Google Icon
2/16/2026Vanguard Personalized Indexing Management LLC9,755$0.72M0.0%+4.4%0.008%Search for SEC Filing on Google Icon
2/16/2026Verition Fund Management LLC26,078$1.93M0.0%-4.0%0.020%Search for SEC Filing on Google Icon
2/16/2026Marnell Management LLC11,700$0.87M0.4%N/A0.009%Search for SEC Filing on Google Icon
2/16/2026Entropy Technologies LP20,137$1.49M0.1%+246.2%0.016%Search for SEC Filing on Google Icon
2/16/2026Barclays PLC66,613$4.93M0.0%-118.1%0.052%Search for SEC Filing on Google Icon
2/16/2026Agman Capital LLC72,283$5.35M4.5%N/A0.056%Search for SEC Filing on Google Icon
2/13/2026Kestra Advisory Services LLC1,138$84K0.0%N/A0.001%Search for SEC Filing on Google Icon
2/13/2026Transamerica Financial Advisors LLC805$59K0.0%+37.4%0.001%Search for SEC Filing on Google Icon
2/13/2026The Manufacturers Life Insurance Company 33,451$2.47M0.0%+19.1%0.026%Search for SEC Filing on Google Icon
2/13/2026CANADA LIFE ASSURANCE Co19,331$1.43M0.0%+27.1%0.015%Search for SEC Filing on Google Icon
2/13/2026UMB Bank n.a.393$29K0.0%-32.0%0.000%Search for SEC Filing on Google Icon
2/13/2026Stifel Financial Corp18,921$1.40M0.0%+12.9%0.015%Search for SEC Filing on Google Icon
2/13/2026Hudson Bay Capital Management LP30,443$2.25M0.0%+770.8%0.024%Search for SEC Filing on Google Icon
2/13/2026Quarry LP426$31K0.0%N/A0.000%Search for SEC Filing on Google Icon
2/13/2026Morgan Stanley759,623$56.17M0.0%-6.9%0.592%Search for SEC Filing on Google Icon
2/13/2026Jacobs Levy Equity Management Inc.668,405$49.42M0.2%-22.3%0.521%Search for SEC Filing on Google Icon
2/13/2026Recurrent Investment Advisors LLC75,633$5.59M0.4%+317.7%0.059%Search for SEC Filing on Google Icon
2/13/2026First Trust Advisors LP146,411$10.83M0.0%-11.2%0.114%Search for SEC Filing on Google Icon
2/13/2026Alyeska Investment Group L.P.103,041$7.62M0.0%-14.1%0.080%Search for SEC Filing on Google Icon
2/13/2026Charles Schwab Investment Management Inc.297,248$21.98M0.0%+8.9%0.232%Search for SEC Filing on Google Icon
2/13/2026Thomist Capital Management LP111,900$8.37M1.8%+142.2%0.087%Search for SEC Filing on Google Icon
2/13/2026State Street Corp1,396,633$103.27M0.0%+7.8%1.089%Search for SEC Filing on Google Icon
2/13/2026Victory Capital Management Inc.1,113,819$82.36M0.0%-61.1%0.868%Search for SEC Filing on Google Icon
2/13/2026Storgate LLC5,380$0.40M0.3%N/A0.004%Search for SEC Filing on Google Icon
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC924,704$68.37M0.0%+0.8%0.721%Search for SEC Filing on Google Icon
2/13/2026Wells Fargo & Company MN91,879$6.79M0.0%-5.4%0.072%Search for SEC Filing on Google Icon
2/13/2026Van Lanschot Kempen Investment Management N.V.235,919$17.44M0.2%+20.3%0.184%Search for SEC Filing on Google Icon
2/13/2026HITE Hedge Asset Management LLC52,153$3.86M0.2%-47.8%0.041%Search for SEC Filing on Google Icon
2/13/2026Quadrant Capital Group LLC447$33K0.0%-94.3%0.000%Search for SEC Filing on Google Icon
2/12/2026Advisors Asset Management Inc.6,047$0.45M0.0%-20.7%0.005%Search for SEC Filing on Google Icon
2/12/2026Federation des caisses Desjardins du Quebec2,559$0.19M0.0%+17.0%0.002%Search for SEC Filing on Google Icon
2/12/2026MetLife Investment Management LLC16,295$1.21M0.0%-4.9%0.013%Search for SEC Filing on Google Icon
2/12/2026Sprott Inc.140,000$10.35M0.3%+7.7%0.109%Search for SEC Filing on Google Icon
2/12/2026Dimensional Fund Advisors LP1,885,678$139.43M0.0%+45.0%1.470%Search for SEC Filing on Google Icon
2/12/2026Federated Hermes Inc.107,730$7.97M0.0%+3,456.6%0.084%Search for SEC Filing on Google Icon
2/12/2026Bank of Montreal Can26,923$1.99M0.0%-40.4%0.021%Search for SEC Filing on Google Icon
2/12/2026Robotti Robert256,244$18.95M3.4%+40.9%0.200%Search for SEC Filing on Google Icon
2/12/2026South Dakota Investment Council20,235$1.50M0.0%-9.8%0.016%Search for SEC Filing on Google Icon
2/12/2026Swiss National Bank75,900$5.61M0.0%N/A0.059%Search for SEC Filing on Google Icon
2/12/2026Xponance LLC3,101$0.23M0.0%-17.1%0.002%Search for SEC Filing on Google Icon
2/12/2026Nuveen LLC652,909$48.28M0.0%-4.9%0.509%Search for SEC Filing on Google Icon
2/11/2026Empowered Funds LLC2,823$0.21M0.0%N/A0.002%Search for SEC Filing on Google Icon
2/11/2026Deutsche Bank AG1,084$80K0.0%N/A0.001%Search for SEC Filing on Google Icon
2/11/2026Brandes Investment Partners LP1,670,327$123.51M0.9%+7.9%1.302%Search for SEC Filing on Google Icon
2/11/2026Cerity Partners LLC127,095$9.40M0.0%+53.0%0.099%Search for SEC Filing on Google Icon
2/11/2026LPL Financial LLC12,648$0.94M0.0%+2.3%0.010%Search for SEC Filing on Google Icon
2/11/2026Erste Asset Management GmbH420,000$31.06M0.3%+61.5%0.327%Search for SEC Filing on Google Icon
2/11/2026JPMorgan Chase & Co.67,320$4.98M0.0%-57.3%0.052%Search for SEC Filing on Google Icon
2/11/2026Capital World Investors2,171,324$160.55M0.0%N/A1.693%Search for SEC Filing on Google Icon
2/11/2026BI Asset Management Fondsmaeglerselskab A S7,037$0.52M0.0%+90.2%0.005%Search for SEC Filing on Google Icon
2/11/2026Parallel Advisors LLC355$26K0.0%-54.4%0.000%Search for SEC Filing on Google Icon
2/11/2026Total Wealth Planning & Management Inc.2,955$0.22M0.2%N/A0.002%Search for SEC Filing on Google Icon
2/11/2026Daiwa Securities Group Inc.4,108$0.30M0.0%+2.9%0.003%Search for SEC Filing on Google Icon
2/11/2026State of Wyoming7,824$0.58M0.1%N/A0.006%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: $108.56
Low: $107.00
High: $111.47

50 Day Range

MA: $97.32
Low: $79.34
High: $114.32

52 Week Range

Now: $108.56
Low: $56.33
High: $116.46

Volume

1,549,761 shs

Average Volume

1,408,511 shs

Market Capitalization

$13.89 billion

P/E Ratio

N/A

Dividend Yield

2.00%

Beta

0.83

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

Westlake's top insider investors include:
  1. Albert Chao (Chairman)
  2. Mark Steven Bender (CFO)
  3. Robert F Buesinger (EVP)
  4. David Tsung-Hung Chao (Director)
Learn More about top insider investors at Westlake.

Who are the major institutional investors of Westlake?

Westlake's top institutional shareholders include:
  1. Orbis Allan Gray Ltd — 3.42%
  2. Wellington Management Group LLP — 3.29%
  3. Vanguard Group Inc. — 3.05%
  4. Price T Rowe Associates Inc. MD — 1.72%
  5. Capital World Investors — 1.69%
  6. Dimensional Fund Advisors LP — 1.47%
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. Victory Capital Management Inc.
  2. Goldman Sachs Group Inc.
  3. Royal Bank of Canada
  4. Jacobs Levy Equity Management Inc.
  5. ANTIPODES PARTNERS Ltd
  6. BNP Paribas Financial Markets
  7. JPMorgan Chase & Co.
  8. Jump Financial LLC
In the last year, company insiders that have sold Westlake company stock include:
  1. Albert Chao (Chairman)
  2. Mark Steven Bender (CFO)
  3. Robert F Buesinger (EVP)
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. Wellington Management Group LLP
  2. Capital World Investors
  3. Dimensional Fund Advisors LP
  4. Vanguard Group Inc.
  5. Orbis Allan Gray Ltd
  6. Jane Street Group LLC
  7. Barclays PLC
  8. Millennium Management LLC