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
May 13, 2026 Sell	Common Stock F-InKind	Bender Mark Steven EVP & CFO	C-Suite Officer	5 284 Value: $514.3K
May 12, 2026 Buy	Common Stock M-Exempt	Bender Mark Steven EVP & CFO	C-Suite Officer	13 164 Value: $1.27M
May 12, 2026 Buy	Restricted Stock Units M-Exempt	Bender Mark Steven EVP & CFO	C-Suite Officer	13 164 Value: $1.27M
Apr 02, 2026 Buy	Restricted Stock Units A-Award	Powers Brian John SVP, Pem Segment Head	Officer	1 961 Value: $234.1K
Apr 02, 2026 Buy	Employee Option (right to buy)	Powers Brian John SVP, Pem Segment Head	Officer	3 233 Value: $305.5K
Apr 02, 2026 Buy	Restricted Stock Units	Powers Brian John SVP, Pem Segment Head	Officer	882 Value: $105.3K
Mar 27, 2026 Sell	Common Stock S-Sale	Buesinger Robert F. EVP, Pem Segment Head	Officer	4 000 Value: $461.0K
Mar 27, 2026 Sell	Common Stock S-Sale	Bender Mark Steven EVP & CFO	C-Suite Officer	16 413 Value: $1.85M
Feb 27, 2026 Buy	Common Stock M-Exempt	Bender Mark Steven EVP & CFO	C-Suite Officer	6 494 Value: $562.0K
Feb 27, 2026 Buy	Common Stock M-Exempt	Bender Mark Steven EVP & CFO	C-Suite Officer	6 199 Value: $408.0K
Feb 27, 2026 Sell	Common Stock D-Return	Bender Mark Steven EVP & CFO	C-Suite Officer	12 693 Value: $1.25M
Feb 27, 2026 Sell	Common Stock S-Sale	Bender Mark Steven EVP & CFO	C-Suite Officer	16 988 Value: $1.71M
Feb 27, 2026 Sell	Common Stock S-Sale	Bender Mark Steven EVP & CFO	C-Suite Officer	421 Value: $42.7K
Feb 27, 2026 Buy	Employee Option (right to buy) M-Exempt	Bender Mark Steven EVP & CFO	C-Suite Officer	6 199 Value: $408.0K
Feb 27, 2026 Buy	Employee Option (right to buy) M-Exempt	Bender Mark Steven EVP & CFO	C-Suite Officer	6 494 Value: $562.0K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Patel Bhavesh V. Director	Director	1 852 Value: $174.8K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Chao James Senior Chairman	CEO / President	7 472 Value: $705.4K
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Chao James Senior Chairman	CEO / President	27 382 Value: $2.59M
Feb 20, 2026 Sell	Common Stock F-InKind	Chao James Senior Chairman	CEO / President	1 569 Value: $147.6K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Chao Albert Executive Chairman	CEO / President	14 945 Value: $1.41M
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Chao Albert Executive Chairman	CEO / President	54 763 Value: $5.17M
Feb 20, 2026 Sell	Common Stock F-InKind	Chao Albert Executive Chairman	CEO / President	2 501 Value: $235.3K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Chao John Tsung-chen Director	Director	1 104 Value: $104.2K
Feb 20, 2026 Buy	Restricted Stock Units A-Award	Chao John Tsung-chen Director	Director	2 434 Value: $229.8K
Feb 20, 2026 Buy	Employee Option (right to buy) A-Award	Chao John Tsung-chen Director	Director	4 044 Value: $382.1K

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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