United States Chemicals

Westlake Corp (WLK)

Track

Over the last 90 days, Westlake Corp. has seen significant insider selling, with a net value of -$2.31 million. Executives have been the primary sellers, contributing to a net executive selling value of -$2.31 million. There were no insider purchases recorded during this period. The stock has experienced a 17.0% decrease in price over the past 90 days.
Stock chart
Ticker: WLK Exchange: NYS
Preparing chart...
Download chart Copy chart image Copy link Share to X Share


Subscribe to get access to the transaction volume chart and in-chart transaction details
• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
ROBERT BUESINGER
Officer
1 sale — total 461,000 USD
Proposed sale 30 Mar 2026
Value US$4,072,965.38 | Price 135.53 | Shares 47,730
Sale 27 Mar 2026
Value US$4,159,637.08 | Price 108.44 | Shares 35,308
Sale 27 Mar 2026
Value US$1,847,036.95 | Price 112.54 | Shares 16,413
Proposed sale 27 Mar 2026
Value US$1,847,033.67 | Price 112.53 | Shares 16,413
Sale 27 Feb 2026
Value US$42,737.82 | Price 101.52 | Shares 421
Sale 27 Feb 2026
Value US$1,714,259.08 | Price 100.91 | Shares 16,988
Proposed sale 27 Feb 2026
Value US$3,003,393.25 | Price 99.77 | Shares 30,102
Sale 22 Dec 2025
Value US$38,784.80 | Price 74.44 | Shares 521
Sale 22 Dec 2025
Value US$2,258,452.78 | Price 73.80 | Shares 30,604
Sale 22 Dec 2025
Value US$707,135.60 | Price 72.82 | Shares 9,711
Proposed sale 22 Dec 2025
Value US$3,004,365.77 | Price 73.57 | Shares 40,836
Sale 27 May 2025
Value US$6,034.10 | Price 72.70 | Shares 83
Buy 22 Apr 2025
Value US$7,751.37 | Price 93.39 | Shares 83
Sale 29 Nov 2024
Value US$225,888.25 | Price 129.08 | Shares 1,750
Proposed sale 26 Nov 2024
Value US$232,750.00 | Price 133.00 | Shares 1,750
Sale 22 Nov 2024
Value US$227,500.00 | Price 130.00 | Shares 1,750
Proposed sale 21 Nov 2024
Value US$227,500.00 | Price 130.00 | Shares 1,750
Proposed sale 23 Aug 2024
Value US$2,221,928.05 | Price 149.48 | Shares 14,864
Proposed sale 16 Aug 2024
Value US$6,568,210.00 | Price 145.00 | Shares 45,298
Sale 9 May 2024
Value US$554,750.00 | Price 158.50 | Shares 3,500
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-03-30 2026-03-30 PrS Proposed sale
2.7
ROBERT BUESINGER

Officer

Officer
47,730
135.53
US$4,072,965 		47,730 135.53 US$4,072,965
2026-03-31 2026-03-27 S Sale
2.7
Buesinger Robert F.

EVP, PEM Segment Head

Officer
35,308 +3.1%
108.44
US$4,159,637 		35,308 +3.1% 108.44 US$4,159,637
2026-03-30 2026-03-27 S Sale
3.1
Bender Mark Steven

EVP & CFO

Officer
64,857 +43.6%
186.44
US$1,231,801 		64,857 +43.6% 186.44 US$1,231,801
2026-03-27 2026-03-27 PrS Proposed sale
3.1
MARK BENDER

Officer

Officer
16,413
112.53
US$1,847,034 		16,413 112.53 US$1,847,034
2026-03-02 2026-02-27 S Sale
3.1
Bender Mark Steven

EVP & CFO

Officer
421 -0.9%
101.52
US$42,738 		421 -0.9% 101.52 US$42,738
2026-03-02 2026-02-27 S Sale
3.1
Bender Mark Steven

EVP & CFO

Officer
16,988 -27.5%
100.91
US$1,714,259 		16,988 -27.5% 100.91 US$1,714,259
2026-02-27 2026-02-27 PrS Proposed sale
3.1
MARK BENDER

Officer

Officer
30,102
99.77
US$3,003,393 		30,102 99.77 US$3,003,393
2025-12-23 2025-12-22 S Sale
2.6
Chao Albert

Executive Chairman

Executive Director
521 -0.1%
74.44
US$38,785 		521 -0.1% 74.44 US$38,785
2025-12-23 2025-12-22 S Sale
2.6
Chao Albert

Executive Chairman

Executive Director
30,604 -4.6%
73.80
US$2,258,453 		30,604 -4.6% 73.80 US$2,258,453
2025-12-23 2025-12-22 S Sale
2.6
Chao Albert

Executive Chairman

Executive Director
9,711 -1.5%
72.82
US$707,136 		9,711 -1.5% 72.82 US$707,136
2025-12-22 2025-12-22 PrS Proposed sale
2.6
ALBERT Y CHAO

Officer; Director

Executive Director
40,836
73.57
US$3,004,366 		40,836 73.57 US$3,004,366
2025-06-09 2025-05-27 S Sale
2.7
Buesinger Robert F.

EVP, PEM Segment Head

Officer
83 -100.0%
72.70
US$6,034 		83 -100.0% 72.70 US$6,034
2025-06-09 2025-04-22 B Purchase
2.7
Buesinger Robert F.

EVP, PEM Segment Head

Officer
83 +inf%
93.39
US$7,751 		83 +inf% 93.39 US$7,751
2024-12-02 2024-11-29 S Sale
3.6
Chao David Tsung-Hung
Non-Executive Director
1,750 -18.4%
129.08
US$225,888 		1,750 -18.4% 129.08 US$225,888
2024-11-26 2024-11-26 PrS Proposed sale
3.6
Chao David Tsung-Hung

Director

Non-Executive Director
1,750
133.00
US$232,750 		1,750 133.00 US$232,750
2024-11-25 2024-11-22 S Sale
3.6
Chao David Tsung-Hung
Non-Executive Director
1,750 -15.5%
130.00
US$227,500 		1,750 -15.5% 130.00 US$227,500
2024-11-21 2024-11-21 PrS Proposed sale
3.6
Chao David Tsung-Hung

Director

Non-Executive Director
1,750
130.00
US$227,500 		1,750 130.00 US$227,500
2024-08-23 2024-08-23 PrS Proposed sale
Janssens Thomas J.

Officer

Officer
14,864
149.48
US$2,221,928 		14,864 149.48 US$2,221,928
2024-08-16 2024-08-16 PrS Proposed sale
2.6
Chao Albert

Officer

Officer
45,298
145.00
US$6,568,210 		45,298 145.00 US$6,568,210
2024-05-13 2024-05-09 S Sale
2.7
Buesinger Robert F.

EVP, HIP, IT & Digital

Officer
3,500 -16.6%
158.50
US$554,750 		3,500 -16.6% 158.50 US$554,750
Explore more

More insider trading research around Westlake Corp

More insider trades in United States
Similar Basic Materials companies with insider activity
More Chemicals companies with insider activity
More Chemicals companies with insider activity
Insider trading in North America