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 17, 2026 Buy	Common Stock M-Exempt	Bender Mark Steven EVP & CFO	C-Suite Officer	4 751 Value: $464.7K
Feb 17, 2026 Buy	Restricted Stock Units M-Exempt	Bender Mark Steven EVP & CFO	C-Suite Officer	4 751 Value: $464.7K
Dec 22, 2025 Buy	Employee Option (right to buy) M-Exempt	Chao Albert Executive Chairman	CEO / President	81 673 Value: $3.63M
Dec 22, 2025 Sell	Common Stock S-Sale	Chao Albert Executive Chairman	CEO / President	521 Value: $38.8K
Dec 22, 2025 Sell	Common Stock S-Sale	Chao Albert Executive Chairman	CEO / President	9 711 Value: $707.1K
Dec 22, 2025 Buy	Common Stock M-Exempt	Chao Albert Executive Chairman	CEO / President	81 673 Value: $3.63M
Dec 22, 2025 Sell	Common Stock S-Sale	Chao Albert Executive Chairman	CEO / President	30 604 Value: $2.26M
Dec 10, 2025 Buy	Restricted Stock Units M-Exempt	Cregg Roger A Director	Director	1 339 Value: $97.4K
Dec 10, 2025 Buy	Common Stock M-Exempt	Cregg Roger A Director	Director	1 339 Value: $97.4K
Oct 02, 2025 Sell	Common Stock F-InKind	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	3 842 Value: $294.7K
Oct 02, 2025 Sell	Common Stock F-InKind	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	3 842 Value: $294.7K
Oct 01, 2025 Buy	Common Stock M-Exempt	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	10 840 Value: $832.1K
Oct 01, 2025 Buy	Restricted Stock Units M-Exempt	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	10 840 Value: $832.1K
Oct 01, 2025 Buy	Restricted Stock Units M-Exempt	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	10 840 Value: $832.1K
Oct 01, 2025 Buy	Common Stock M-Exempt	Szwejbka Scott Thomas SVP, Hip Segment Head	Officer	10 840 Value: $832.1K
Aug 28, 2025 Sell	Common Stock G-Gift	Chao James Senior Chairman	CEO / President	15 140 Value: $0
Aug 28, 2025 Sell	Common Stock G-Gift	Chao James Senior Chairman	CEO / President	15 140 Value: $0
Aug 09, 2025 Buy	Common Stock M-Exempt	Chao David Tsung-hung Director	Director	1 128 Value: $97.4K
Aug 09, 2025 Buy	Restricted Stock Units M-Exempt	Chao Catherine T. Director	Director	1 128 Value: $97.4K
Aug 09, 2025 Buy	Common Stock M-Exempt	Chao Catherine T. Director	Director	1 128 Value: $97.4K
Aug 09, 2025 Buy	Restricted Stock Units M-Exempt	Graff Michael J Director	Director	1 128 Value: $97.4K
Aug 08, 2025 Buy	Restricted Stock Units A-Award	Chao David Tsung-hung Director	Director	2 168 Value: $171.3K
Aug 08, 2025 Buy	Restricted Stock Units A-Award	Chao Catherine T. Director	Director	2 168 Value: $171.3K
Aug 08, 2025 Buy	Restricted Stock Units A-Award	Graff Michael J Director	Director	2 168 Value: $171.3K
Feb 16, 2022 Sell	Common Stock F-InKind	Bender Mark Steven EVP & CFO	C-Suite Officer	1 171 Value: $122.9K

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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