Institutional shares held 38.3 Million
234K calls
764K puts
Total value of holdings $2.5B
$15.3M calls
$49.8M puts
Market Cap $8.12B
127,961,000 Shares Out.
Institutional ownership 29.95%
# of Institutions 359


Latest Institutional Activity in WLK

Top Purchases

Q3 2025
Thompson Siegel & Walmsley LLC Shares Held: 441K ($28M)
Q3 2025
Impala Asset Management LLC Shares Held: 115K ($7.3M)
Q3 2025
Erste Asset Management Gmb H Shares Held: 260K ($16.5M)
Q3 2025
Geode Capital Management, LLC Shares Held: 653K ($41.4M)
Q3 2025
Pro Share Advisors LLC Shares Held: 423K ($26.8M)

Top Sells

Q3 2025
Victory Capital Management Inc Shares Held: 2.87M ($182M)
Q3 2025
Antipodes Partners LTD Shares Held: 556K ($35.3M)
Q3 2025
Nuveen, LLC Shares Held: 687K ($43.6M)
Q3 2025
Wedge Capital Management L L P Shares Held: 39.4K ($2.5M)
Q3 2025
Vanguard Group Inc Shares Held: 3.44M ($218M)

About WLK

Westlake Corporation manufactures and supplies petrochemicals, polymers, and building products worldwide. It operates through two segments, Performance and Essential Materials; and Housing and Infrastructure Products. The Performance and Essential Materials segment manufactures and markets polyethylene, styrene monomer, ethylene co-products, PVC, VCM, ethylene dichloride chlor-alkali, and chlorinated derivative products. The Housing and Infrastructure Products segment manufactures and sells residential PVC siding; PVC trim and moldings; roofing applications; decorative stone; windows; PVC decking; PVC films for various inflatables, wallcovering, tape, and roofing applications; polymer composite roof tiles; PVC pipe and fittings; PVC compounds; and various consumer and commercial products such as landscape edging; industrial, home and office matting; marine dock edging; and masonry joint controls. The company offers its products to a range of customers, including 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, 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. The company was founded in 1986 and is headquartered in Houston, Texas. Westlake Corporation is a subsidiary of TTWF LP.


Insider Transactions at WLK

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
177K Shares
From 26 Insiders
Exercise of conversion of derivative security 99.9K shares
Grant, award, or other acquisition 77.5K shares
Open market or private purchase 83 shares
Sell / Disposition
78K Shares
From 11 Insiders
Open market or private sale 3.58K shares
Payment of exercise price or tax liability 59.3K shares
Bona fide gift 15.1K shares

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