NYSE:WLK

Westlake Chemical Stock Insider Trading

Basic Materials > Chemicals - Specialty

Buy WLK

*Your capital is at risk

$86.39

-0.440 (-0.507%)

At Close: Jun 03, 2026

Westlake Chemical Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at -9.98. In total, the insiders bought 749.12K and sold 152.82K WLK shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	-9.98
● Buy	749.12K shares
● Sell	152.82K shares
70% Buy Activity Moderate Negative Correlation
Sell Signal Medium Confidence Mar 27, 2026 Analysis Breakdown: Partially supported by a negative historical correlation. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Feb 20, 2026 Sell	Common Stock F-InKind	Chao John Tsung-chen Director	Director	91 Value: $9K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Bender Mark Steven EVP & CFO	C-Suite Officer	7 747 Value: $731.3K
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Bender Mark Steven EVP & CFO	C-Suite Officer	28 389 Value: $2.68M
Feb 20, 2026 Sell	Common Stock F-InKind	Bender Mark Steven EVP & CFO	C-Suite Officer	445 Value: $41.9K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Buesinger Robert F. EVP, Pem Segment Head	Officer	5 281 Value: $498.5K
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Buesinger Robert F. EVP, Pem Segment Head	Officer	19 351 Value: $1.83M
Feb 20, 2026 Sell	Common Stock F-InKind	Buesinger Robert F. EVP, Pem Segment Head	Officer	326 Value: $30.7K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Ederington L. Benjamin EVP, Legal & External Affairs	Officer	7 002 Value: $661.0K
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Ederington L. Benjamin EVP, Legal & External Affairs	Officer	25 656 Value: $2.42M
Feb 20, 2026 Sell	Common Stock F-InKind	Ederington L. Benjamin EVP, Legal & External Affairs	Officer	357 Value: $33.6K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Holy Jeffrey Adam Vp And Cao	Officer	1 199 Value: $113.2K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Holy Jeffrey Adam Vp And Cao	Officer	2 540 Value: $239.8K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	3 983 Value: $376.0K
Feb 20, 2026 Sell	Common Stock F-InKind	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	91 Value: $9K
Feb 20, 2026 Buy	Common Stock J-Other	Patel Bhavesh V. Insider	Other	0 Value: $0
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	14 595 Value: $1.38M
Feb 20, 2026 Sell	Common Stock F-InKind	Holy Jeffrey Adam Vp And Cao	Officer	81 Value: $8K
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Holy Jeffrey Adam Vp And Cao	Officer	4 394 Value: $415.1K
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Gilson Jean-marc President And CEO	CEO / President	109 139 Value: $10.3M
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Gilson Jean-marc President And CEO	CEO / President	29 784 Value: $2.81M
Feb 19, 2026 Buy	Common Stock A-Award	Chao James Senior Chairman	CEO / President	3 884 Value: $369.2K
Feb 19, 2026 Buy	Common Stock A-Award	Chao Albert Executive Chairman	CEO / President	6 193 Value: $588.7K
Feb 19, 2026 Buy	Common Stock A-Award	Chao John Tsung-chen Director	Director	213 Value: $20.2K
Feb 19, 2026 Buy	Common Stock A-Award	Bender Mark Steven EVP & CFO	C-Suite Officer	1 777 Value: $168.9K
Feb 19, 2026 Buy	Common Stock A-Award	Buesinger Robert F. EVP, Pem Segment Head	Officer	1 301 Value: $123.7K

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT WESTLAKE CHEMICAL CORPORATION

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 Infrastru...

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