United States Chemicals

Westlake Corp (WLK)

Track

Westlake Corp experienced insider trading activity primarily through sales by executives, with the most recent transactions occurring on March 30, 2026. Key officers, including the CFO and EVP, executed multiple sell orders and proposed sales between February and March 2026. No insider buying activity has been recorded in the most recent period.
Ticker: WLK Exchange: NYS
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for Westlake Corp. Upgrade to see score, net flow, insiders and the full signal context.

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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
Proposed sale 6 May 2024
Value US$1,048,197.50 | Price 158.03 | Shares 6,633
Sale 3 May 2024
Value US$753,340.50 | Price 152.19 | Shares 4,950
Proposed sale 3 May 2024
Value US$753,341.00 | Price 152.19 | Shares 4,950
Proposed sale 21 Mar 2024
Value US$98,921.21 | Price 150.57 | Shares 657
Sale 15 Mar 2024
Value US$560,371.00 | Price 144.50 | Shares 3,878
Sale 13 Mar 2024
Value US$17,629.00 | Price 144.50 | Shares 122
Proposed sale 8 Mar 2024
Value US$394,441.84 | Price 142.09 | Shares 2,776
Sale 6 Mar 2024
Value US$677,455.28 | Price 141.02 | Shares 4,804
Proposed sale 5 Mar 2024
Value US$678,565.00 | Price 141.25 | Shares 4,804
Proposed sale 29 Feb 2024
Value US$2,384,108.50 | Price 143.02 | Shares 16,670
Sale 26 Feb 2024
Value US$667,764.78 | Price 137.57 | Shares 4,854
Proposed sale 23 Feb 2024
Value US$679,560.00 | Price 140.00 | Shares 4,854
Proposed sale 30 Nov 2023
Value US$8,731,264.00 | Price 131.87 | Shares 66,213
Sale 15 Nov 2023
Value US$550,057.50 | Price 130.50 | Shares 4,215
Proposed sale 14 Nov 2023
Value US$550,057.50 | Price 130.50 | Shares 4,215
Proposed sale 30 Aug 2023
Value US$45,963,811.60 | Price 134.06 | Shares 342,860
Proposed sale 30 Aug 2023
Value US$1,844,059.59 | Price 134.27 | Shares 13,734
Proposed sale 30 Aug 2023
Value US$5,360,791.28 | Price 134.06 | Shares 39,988
Proposed sale 29 Aug 2023
Value US$516,078.74 | Price 133.87 | Shares 3,855
Sale 23 Aug 2023
Value US$131,000.00 | Price 131.00 | Shares 1,000
Proposed sale 23 Aug 2023
Value US$131,000.00 | Price 131.00 | Shares 1,000
Proposed sale 7 Aug 2023
Value US$2,945,481.35 | Price 140.23 | Shares 21,004
Proposed sale 7 Aug 2023
Value US$3,229,680.12 | Price 131.08 | Shares 24,639
Proposed sale 19 May 2023
Value US$229,005.16 | Price 116.66 | Shares 1,963
Proposed sale 9 May 2023
Value US$1,640,512.35 | Price 126.61 | Shares 12,957
Proposed sale 8 May 2023
Value US$3,745,967.93 | Price 117.35 | Shares 31,922
Sale 31 Aug 2022
Value US$98,940.00 | Price 98.94 | Shares 1,000
Sale 26 Aug 2022
Value US$58,037.36 | Price 107.08 | Shares 542
Sale 27 May 2022
Value US$1,867,820.41 | Price 129.47 | Shares 14,427
Sale 19 May 2022
Value US$652,712.01 | Price 129.38 | Shares 5,045
Sale 19 May 2022
Value US$2,710,019.33 | Price 130.20 | Shares 20,815
Sale 19 May 2022
Value US$1,575,450.20 | Price 131.11 | Shares 12,016
Sale 17 May 2022
Value US$1,142,739.18 | Price 136.24 | Shares 8,388
Sale 5 May 2022
Value US$437,694.18 | Price 139.26 | Shares 3,143
Sale 5 May 2022
Value US$1,319,640.00 | Price 140.00 | Shares 9,426
Sale 31 Mar 2022
Value US$12,499.00 | Price 124.99 | Shares 100
Sale 31 Mar 2022
Value US$736,234.90 | Price 124.34 | Shares 5,921
Sale 29 Mar 2022
Value US$489,748.00 | Price 122.44 | Shares 4,000
Sale 25 Mar 2022
Value US$370,558.73 | Price 125.74 | Shares 2,947
Sale 25 Mar 2022
Value US$632,165.67 | Price 125.11 | Shares 5,053
Sale 25 Mar 2022
Value US$361,636.12 | Price 126.40 | Shares 2,861
Sale 25 Mar 2022
Value US$940,291.42 | Price 125.84 | Shares 7,472
Sale 24 Mar 2022
Value US$1,003,069.60 | Price 125.38 | Shares 8,000
Sale 23 Mar 2022
Value US$43,235.98 | Price 125.69 | Shares 344
Sale 23 Mar 2022
Value US$707,774.87 | Price 125.14 | Shares 5,656
Sale 10 Mar 2022
Value US$2,652,693.55 | Price 117.61 | Shares 22,555
Sale 9 Mar 2022
Value US$315,451.50 | Price 115.55 | Shares 2,730
Sale 1 Mar 2022
Value US$111,052.34 | Price 110.39 | Shares 1,006
Sale 2 Dec 2021
Value US$1,875,978.83 | Price 92.29 | Shares 20,327
Sale 2 Dec 2021
Value US$694,179.20 | Price 91.52 | Shares 7,585
Sale 2 Dec 2021
Value US$105,891.00 | Price 90.12 | Shares 1,175
Sale 2 Dec 2021
Value US$151,725.00 | Price 89.25 | Shares 1,700
Sale 1 Dec 2021
Value US$359,197.20 | Price 94.80 | Shares 3,789
Sale 1 Dec 2021
Value US$404,114.00 | Price 93.98 | Shares 4,300
Sale 1 Dec 2021
Value US$389,676.00 | Price 92.78 | Shares 4,200
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
3.2
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
3.2
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
3.2
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
3.2
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
3.2
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
2024-05-06 2024-05-06 PrS Proposed sale
2.7
Buesinger Robert F.

Officer

Officer
6,633
158.03
US$1,048,198 		6,633 158.03 US$1,048,198
2024-05-06 2024-05-03 S Sale
3.2
Bender Mark Steven

EVP & CFO

Officer
4,950 -10.9%
152.19
US$753,340 		4,950 -10.9% 152.19 US$753,340
2024-05-03 2024-05-03 PrS Proposed sale
3.2
Bender Mark Steven

Officer

Officer
4,950
152.19
US$753,341 		4,950 152.19 US$753,341
2024-03-21 2024-03-21 PrS Proposed sale
2.4
Zoeller Johnathan Stevan

Officer

Officer
657
150.57
US$98,921 		657 150.57 US$98,921
2024-03-18 2024-03-15 S Sale
2.7
Buesinger Robert F.

EVP, HIP, IT & Digital

Officer
3,878 -15.5%
144.50
US$560,371 		3,878 -15.5% 144.50 US$560,371
2024-03-14 2024-03-13 S Sale
2.7
Buesinger Robert F.

EVP, HIP, IT & Digital

Officer
122 -0.5%
144.50
US$17,629 		122 -0.5% 144.50 US$17,629
2024-03-08 2024-03-08 PrS Proposed sale
2.4
Zoeller Johnathan Stevan

Officer

Officer
2,776
142.09
US$394,442 		2,776 142.09 US$394,442
2024-03-07 2024-03-06 S Sale
3.2
Bender Mark Steven

EVP & CFO

Officer
4,804 -9.6%
141.02
US$677,455 		4,804 -9.6% 141.02 US$677,455
2024-03-05 2024-03-05 PrS Proposed sale
3.2
Bender Mark Steven

Officer

Officer
4,804
141.25
US$678,565 		4,804 141.25 US$678,565
2024-02-29 2024-02-29 PrS Proposed sale
2.7
Buesinger Robert F.

Officer

Officer
16,670
143.02
US$2,384,108 		16,670 143.02 US$2,384,108
2024-02-28 2024-02-26 S Sale
3.2
Bender Mark Steven

EVP & CFO

Officer
4,854 -8.8%
137.57
US$667,765 		4,854 -8.8% 137.57 US$667,765
2024-02-23 2024-02-23 PrS Proposed sale
3.2
Bender Mark Steven

Officer

Officer
4,854
140.00
US$679,560 		4,854 140.00 US$679,560
2023-11-30 2023-11-30 PrS Proposed sale
3.2
Chao James

Officer

Officer
66,213
131.87
US$8,731,264 		66,213 131.87 US$8,731,264
2023-11-17 2023-11-15 S Sale
2.7
Buesinger Robert F.

EVP, HIP, IT & Digital

Officer
4,215 -20.1%
130.50
US$550,058 		4,215 -20.1% 130.50 US$550,058
2023-11-14 2023-11-14 PrS Proposed sale
2.7
Buesinger Robert F.

Officer

Officer
4,215
130.50
US$550,058 		4,215 130.50 US$550,058
2023-08-30 2023-08-30 PrS Proposed sale
3.2
Chao James

Director

Non-Executive Director
342,860
134.06
US$45,963,812 		342,860 134.06 US$45,963,812
2023-08-30 2023-08-30 PrS Proposed sale
3.8
Ederington L. Benjamin

Officer

Officer
13,734
134.27
US$1,844,060 		13,734 134.27 US$1,844,060
2023-08-30 2023-08-30 PrS Proposed sale
2.6
Chao Albert

Officer

Officer
39,988
134.06
US$5,360,791 		39,988 134.06 US$5,360,791
2023-08-29 2023-08-29 PrS Proposed sale
Janssens Thomas J.

Officer

Officer
3,855
133.87
US$516,079 		3,855 133.87 US$516,079
2023-08-24 2023-08-23 S Sale
3.6
Chao David Tsung-Hung
Non-Executive Director Large shareholder
1,000 -9.0%
131.00
US$131,000 		1,000 -9.0% 131.00 US$131,000
2023-08-23 2023-08-23 PrS Proposed sale
3.6
Chao David Tsung-Hung

Director

Non-Executive Director
1,000
131.00
US$131,000 		1,000 131.00 US$131,000
2023-08-07 2023-08-07 PrS Proposed sale
2.7
Buesinger Robert F.

Officer

Officer
21,004
140.23
US$2,945,481 		21,004 140.23 US$2,945,481
2023-08-07 2023-08-07 PrS Proposed sale
3.2
Bender Mark Steven

Officer

Officer
24,639
131.08
US$3,229,680 		24,639 131.08 US$3,229,680
2023-05-19 2023-05-19 PrS Proposed sale
2.4
Zoeller Johnathan Stevan

Officer

Officer
1,963
116.66
US$229,005 		1,963 116.66 US$229,005
2023-05-09 2023-05-09 PrS Proposed sale
2.7
Buesinger Robert F.

Officer

Officer
12,957
126.61
US$1,640,512 		12,957 126.61 US$1,640,512
2023-05-08 2023-05-08 PrS Proposed sale
3.2
Bender Mark Steven

Officer

Officer
31,922
117.35
US$3,745,968 		31,922 117.35 US$3,745,968
2022-09-01 2022-08-31 S Sale
2.7
Buesinger Robert F.

EVP, HIP, IT & Digital

Officer
1,000 -8.9%
98.94
US$98,940 		1,000 -8.9% 98.94 US$98,940
2022-08-29 2022-08-26 S Sale
2.4
Zoeller Johnathan Stevan

VP & Chief Accounting Officer

Officer
542 -50.0%
107.08
US$58,037 		542 -50.0% 107.08 US$58,037
2022-05-31 2022-05-27 S Sale
2.7
Buesinger Robert F.

EVP, HIP, IT & Digital

Officer
14,427 -55.1%
129.47
US$1,867,820 		14,427 -55.1% 129.47 US$1,867,820
2022-05-23 2022-05-19 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
5,045 -1.1%
129.38
US$652,712 		5,045 -1.1% 129.38 US$652,712
2022-05-23 2022-05-19 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
20,815 -4.2%
130.20
US$2,710,019 		20,815 -4.2% 130.20 US$2,710,019
2022-05-23 2022-05-19 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
12,016 -2.4%
131.11
US$1,575,450 		12,016 -2.4% 131.11 US$1,575,450
2022-05-18 2022-05-17 S Sale
3.4
Kearns Roger L.

COO and EVP - PEM

Officer
8,388 -24.1%
136.24
US$1,142,739 		8,388 -24.1% 136.24 US$1,142,739
2022-05-06 2022-05-05 S Sale
3.8
Ederington L. Benjamin

EVP, GC, CAO and Secretary

Officer
3,143 -7.7%
139.26
US$437,694 		3,143 -7.7% 139.26 US$437,694
2022-05-06 2022-05-05 S Sale
3.8
Ederington L. Benjamin

EVP, GC, CAO and Secretary

Officer
9,426 -18.9%
140.00
US$1,319,640 		9,426 -18.9% 140.00 US$1,319,640
2022-04-01 2022-03-31 S Sale
3.2
Bender Mark Steven

EVP and CFO

Officer
100 -0.3%
124.99
US$12,499 		100 -0.3% 124.99 US$12,499
2022-04-01 2022-03-31 S Sale
3.2
Bender Mark Steven

EVP and CFO

Officer
5,921 -16.1%
124.34
US$736,235 		5,921 -16.1% 124.34 US$736,235
2022-03-30 2022-03-29 S Sale
3.2
Bender Mark Steven

EVP and CFO

Officer
4,000 -11.5%
122.44
US$489,748 		4,000 -11.5% 122.44 US$489,748
2022-03-28 2022-03-25 S Sale
3.2
Bender Mark Steven

EVP and CFO

Officer
2,947 -8.8%
125.74
US$370,559 		2,947 -8.8% 125.74 US$370,559
2022-03-28 2022-03-25 S Sale
3.2
Bender Mark Steven

EVP and CFO

Officer
5,053 -13.0%
125.11
US$632,166 		5,053 -13.0% 125.11 US$632,166
2022-03-28 2022-03-25 S Sale
3.4
Kearns Roger L.

COO and EVP - PEM

Officer
2,861 -9.8%
126.40
US$361,636 		2,861 -9.8% 126.40 US$361,636
2022-03-28 2022-03-25 S Sale
3.4
Kearns Roger L.

COO and EVP - PEM

Officer
7,472 -20.3%
125.84
US$940,291 		7,472 -20.3% 125.84 US$940,291
2022-03-25 2022-03-24 S Sale
3.2
Bender Mark Steven

EVP and CFO

Officer
8,000 -20.7%
125.38
US$1,003,070 		8,000 -20.7% 125.38 US$1,003,070
2022-03-24 2022-03-23 S Sale
3.2
Bender Mark Steven

EVP and CFO

Officer
344 -1.1%
125.69
US$43,236 		344 -1.1% 125.69 US$43,236
2022-03-24 2022-03-23 S Sale
3.2
Bender Mark Steven

EVP and CFO

Officer
5,656 -15.4%
125.14
US$707,775 		5,656 -15.4% 125.14 US$707,775
2022-03-14 2022-03-10 S Sale
2.7
Buesinger Robert F.

EVP, HIP, IT & Digital

Officer
22,555 -60.3%
117.61
US$2,652,694 		22,555 -60.3% 117.61 US$2,652,694
2022-03-10 2022-03-09 S Sale
2.7
Buesinger Robert F.

EVP, HIP, IT & Digital

Officer
2,730 -15.5%
115.55
US$315,452 		2,730 -15.5% 115.55 US$315,452
2022-03-02 2022-03-01 S Sale
2.4
Zoeller Johnathan Stevan

VP and CAO

Officer
1,006 -46.5%
110.39
US$111,052 		1,006 -46.5% 110.39 US$111,052
2021-12-06 2021-12-02 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
20,327 -4.4%
92.29
US$1,875,979 		20,327 -4.4% 92.29 US$1,875,979
2021-12-06 2021-12-02 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
7,585 -1.6%
91.52
US$694,179 		7,585 -1.6% 91.52 US$694,179
2021-12-06 2021-12-02 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
1,175 -0.2%
90.12
US$105,891 		1,175 -0.2% 90.12 US$105,891
2021-12-06 2021-12-02 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
1,700 -0.4%
89.25
US$151,725 		1,700 -0.4% 89.25 US$151,725
2021-12-03 2021-12-01 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
3,789 -0.9%
94.80
US$359,197 		3,789 -0.9% 94.80 US$359,197
2021-12-03 2021-12-01 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
4,300 -1.0%
93.98
US$404,114 		4,300 -1.0% 93.98 US$404,114
2021-12-03 2021-12-01 S Sale
2.6
Chao Albert

President & CEO

Executive Director Large shareholder
4,200 -0.9%
92.78
US$389,676 		4,200 -0.9% 92.78 US$389,676
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