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WLK

WESTLAKE (WLK) stock: insider trades, news & valuation

Heavy selling
Close · Oct 9, 2026 $62.29 -0.0% on the day -20.7% over 12 months 52-week range $54.89 – $121.80

Share price and insider trades

WLK closeInsider buyInsider sale
406080100120140NovDecJan 2026FebMarAprMayJunJulAugSepOctSold $1,756,999 on 2026-02-27 · Mark Steven BenderSold $2,308,119 on 2026-03-27 · Mark Steven Bender, Robert F. BuesingerSold $3,004,513 on 2025-12-22 · Albert ChaoSold $3,120,775 on 2026-08-11 · Albert Chao
Bought, 12 months$0
Sold, 12 months$10.2M
Insiders buying0
Insiders selling3

WESTLAKE insider trading at a glance (Oct 9, 2026): in the past 12 months, 0 insiders bought $0 and 3 sold $10.2M of WLK stock on the open market.

WLK insider buying and selling by quarter

Open-market purchases (green, above the line) and sales (red, below), by trade date.

Q4 2025: $3.0M sold (3 trades)Q4 2025Q1 2026: $4.1M sold (4 trades)Q1 2026Q2 2026Q3 2026: $3.1M sold (2 trades)Q3 2026Q4 2026
QuarterBoughtPurchasesSoldSales
Q4 2026—0—0
Q3 2026—0$3.1M2
Q2 2026—0—0
Q1 2026—0$4.1M4
Q4 2025—0$3.0M3

Valuation, profit and volume

P/E (trailing)n/aSector median —
Market value— 
Profit margin—Revenue growth —
Volume vs. 50-day1.1×Last 5 sessions
Insiders' paper profit—On all tracked purchases —

Summary

Over the past 12 months, 0 WESTLAKE CORP insiders reported open-market purchases totaling $0, while 3 insiders reported sales totaling $10.2M. 0 of 9 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.

Insider transactions

Open-market purchases and sales.

Filed Insider Type Shares Price Value Since Score
Aug 11SEC Albert ChaoChair Sell 31,384642,880 held (−5%) $80.42 $2.5M -22.5% —
Aug 11SEC Albert ChaoChair Sell 7,489674,264 held (−1%) $79.70 $597K -21.8% —
Mar 31SEC Robert F. BuesingerEvp, Pem Segment Head Sell 4,00034,482 held (−10%) $115.25 $461K -46.0% —
Mar 30SEC Mark Steven BenderCFO Sell 16,41328,015 held (−37%) $112.54 $1.8M -44.7% —
Mar 2SEC Mark Steven BenderCFO Sell 16,98844,854 held (−27%) $100.91 $1.7M -38.3% —
Mar 2SEC Mark Steven BenderCFO Sell 42144,433 held (−1%) $101.52 $43K -38.6% —
Dec 23SEC Albert ChaoChair Sell 30,604628,243 held (−5%) $73.80 $2.3M -15.6% —
Dec 23SEC Albert ChaoChair Sell 9,711658,847 held (−1%) $72.82 $707K -14.5% —
Dec 23SEC Albert ChaoChair Sell 521627,722 held (−0%) $74.44 $39K -16.3% —

Insiders at WESTLAKE CORP

InsiderBoughtSoldLast filingScore
Albert ChaoChair — $6.1M Aug 11, 2026 —
Mark Steven BenderCFO — $3.6M Mar 30, 2026 —
Robert F. BuesingerEvp, Pem Segment Head — $461K Mar 31, 2026 —

WLK stock: common questions

Are WESTLAKE CORP insiders buying WLK stock?

In the past 12 months, 0 insiders reported open-market purchases of WLK worth $0.

Are WESTLAKE CORP insiders selling WLK stock?

3 insiders reported sales worth $10.2M over the same period.

Where does this data come from?

Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.

What is WLK's 52-week range?

Over the past year WLK has traded between $54.89 and $121.80. It last closed at $62.29 on Oct 9, 2026.