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WESTLAKE CORP

WLK Net buying
CIK 0001262823 #932 in the set updated 17 Sep 2026
Bought (120 mo)
$50.39M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$128.08M
$0.00 on a plan · $101.18M straight out of an exercise
Sold at will
$26.90M
51 of 154 sales
Net
−$77.69M
+$23.49M against sales at will

By person

30 insiders · 236 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
TTWFGP LLC entity
10% owner
$49.98M (37)
—
+$49.98M
47,400,277
37.09%
$3.81B
+3.0%
Chao Albert
Executive Chairman
$258.63K (1)
$49.92M (51) scheduled
−$49.66M
642,880
0.5030%
$51.70M
+140.2%
Bender Mark Steven
EVP & CFO
—
$29.78M (39) scheduled
−$29.78M
35,895
0.0281%
$2.89M
−36.5%
Chao James
Senior Chairman
—
$13.37M (8) scheduled
−$13.37M
49,774
0.0389%
$4.00M
−54.9%
Buesinger Robert F.
EVP, PEM Segment Head
$7.75K (1)
$13.32M (21) scheduled
−$13.32M
34,482
0.0270%
$2.77M
+82,000%
Teel Lawrence E.
EVP and Special Advisor to CEO
—
$5.15M (5) scheduled
−$5.15M
4,903
0.0038%
$394.30K
+463.6%
Kenner Andrew
SVP, Operations
—
$3.86M (3) scheduled
−$3.86M
20,362
0.0159%
$1.64M
+85.5%
Mangieri George J
VP & Chief Accounting Officer
—
$2.82M (7) scheduled
−$2.82M
4,671
0.0037%
$375.64K
−74.3%
Ederington L. Benjamin
EVP, Legal & External Affairs
—
$2.53M (3) scheduled
−$2.53M
80,158
0.0627%
$6.45M
—
Kearns Roger L.
EVP and COO
$149.45K (1)
$2.44M (3) scheduled
−$2.30M
45,785
0.0358%
$3.68M
—
LUKENS MAX L
Director
—
$1.95M (2)
−$1.95M
9,122
0.0071%
$733.59K
−51.7%
Mattina Michael J.
Sr. VP, Polyethylene
—
$982.78K (1) scheduled
−$982.78K
6,506
0.0051%
$523.21K
+7.3%
BLAKELY ROBERT T
Director
—
$851.41K (2)
−$851.41K
10,989
0.0086%
$883.74K
−22.1%
Chao David Tsung-Hung
Director
—
$584.39K (3)
−$584.39K
30,503
0.0239%
$2.45M
+4,571%
Zoeller Johnathan Stevan
VP and CAO
—
$256.55K (3) scheduled
−$256.55K
4,416
0.0035%
$355.13K
—
RILEY H JOHN JR
Director
—
$232.62K (1)
−$232.62K
22,652
0.0177%
$1.82M
+9.5%
Jenkins Dorothy C
Director
—
$30.38K (2) scheduled
−$30.38K
73,778
0.0577%
$5.93M
+87.9%
Chao Catherine T.
Director
—
—
—
27,171
0.0213%
$2.19M
+1,259%
NORTHCUTT R BRUCE
Director
—
—
—
23,351
0.0183%
$1.88M
+658.9%
Graff Michael J
Director
—
—
—
23,310
0.0182%
$1.87M
+657.6%
Janssens Thomas J.
SVP, Ops - PEM & Corp Logistic
—
—
—
17,127
0.0134%
$1.38M
+195.6%
Sheets Jeffrey Wayne
Director
—
—
—
14,927
0.0117%
$1.20M
—
Lubel Kimberly S
Director
—
—
—
13,821
0.0108%
$1.11M
—
Szwejbka Scott Thomas
SVP, HIP Segment Head
—
—
—
13,773
0.0108%
$1.11M
+136.7%
MCCOLLUM MARK A
Director
—
—
—
11,824
0.0093%
$950.89K
—
Haas Marius
Director
—
—
—
11,631
0.0091%
$935.37K
—
Chao John Tsung-chen
Director
—
—
—
7,888
0.0062%
$634.35K
—
Sabat Carolyn Chao
Director
—
—
—
5,748
0.0045%
$462.25K
—
Holy Jeffrey Adam
VP and CAO
—
—
—
5,124
0.0040%
$412.07K
+70.8%
CREGG ROGER A
Director
—
—
—
3,507
0.0027%
$282.03K
—

Individual transactions

103
Insider
Date
Role
Action
Shares
Price
Amount
Chao Albert
11 Aug 2026
Executive Chairman
Sold after exercise
31,384
$80.42
$2.52M
Chao Albert
11 Aug 2026
Executive Chairman
Sold after exercise
7,489
$79.70
$596.87K
Bender Mark Steven
27 Feb 2026
EVP & CFO
Sold after exercise
421
$101.52
$42.74K
Bender Mark Steven
27 Feb 2026
EVP & CFO
Sold after exercise
16,988
$100.91
$1.71M
Chao Albert
22 Dec 2025
Executive Chairman
Sold after exercise
521
$74.44
$38.78K
Chao Albert
22 Dec 2025
Executive Chairman
Sold after exercise
30,604
$73.80
$2.26M
Chao Albert
22 Dec 2025
Executive Chairman
Sold after exercise
9,711
$72.82
$707.14K
Buesinger Robert F.
27 May 2022
EVP, HIP, IT & Digital
Sold after exercise
14,427
$129.47
$1.87M
Chao Albert
19 May 2022
President & CEO
Sold after exercise
5,045
$129.38
$652.71K
Chao Albert
19 May 2022
President & CEO
Sold after exercise
20,815
$130.20
$2.71M
Chao Albert
19 May 2022
President & CEO
Sold after exercise
12,016
$131.11
$1.58M
Kearns Roger L.
17 May 2022
COO and EVP - PEM
Sold after exercise
8,388
$136.24
$1.14M
Ederington L. Benjamin
5 May 2022
EVP, GC, CAO and Secretary
Sold after exercise
3,143
$139.26
$437.69K
Ederington L. Benjamin
5 May 2022
EVP, GC, CAO and Secretary
Sold after exercise
9,426
$140.00
$1.32M
Bender Mark Steven
31 Mar 2022
EVP and CFO
Sold after exercise
100
$124.99
$12.50K
Bender Mark Steven
31 Mar 2022
EVP and CFO
Sold after exercise
5,921
$124.34
$736.23K
Bender Mark Steven
30 Mar 2022
EVP and CFO
Sold after exercise
3,062
$125.10
$383.04K
Bender Mark Steven
30 Mar 2022
EVP and CFO
Sold after exercise
2,938
$124.50
$365.77K
Bender Mark Steven
29 Mar 2022
EVP and CFO
Sold after exercise
4,000
$122.44
$489.75K
Bender Mark Steven
25 Mar 2022
EVP and CFO
Sold after exercise
2,947
$125.74
$370.56K
Bender Mark Steven
25 Mar 2022
EVP and CFO
Sold after exercise
5,053
$125.11
$632.17K
Kearns Roger L.
25 Mar 2022
COO and EVP - PEM
Sold after exercise
2,861
$126.40
$361.64K
Kearns Roger L.
25 Mar 2022
COO and EVP - PEM
Sold after exercise
7,472
$125.84
$940.29K
Bender Mark Steven
24 Mar 2022
EVP and CFO
Sold after exercise
8,000
$125.38
$1.00M
Bender Mark Steven
23 Mar 2022
EVP and CFO
Sold after exercise
344
$125.69
$43.24K
Bender Mark Steven
23 Mar 2022
EVP and CFO
Sold after exercise
5,656
$125.14
$707.77K
Buesinger Robert F.
10 Mar 2022
EVP, HIP, IT & Digital
Sold after exercise
22,555
$117.61
$2.65M
Zoeller Johnathan Stevan
1 Mar 2022
VP and CAO
Sold after exercise
1,006
$110.39
$111.05K
Chao Albert
2 Dec 2021
President & CEO
Sold after exercise
20,327
$92.29
$1.88M
Chao Albert
2 Dec 2021
President & CEO
Sold after exercise
7,585
$91.52
$694.18K
Chao Albert
2 Dec 2021
President & CEO
Sold after exercise
1,175
$90.12
$105.89K
Chao Albert
2 Dec 2021
President & CEO
Sold after exercise
1,700
$89.25
$151.73K
Chao Albert
1 Dec 2021
President & CEO
Sold after exercise
3,789
$94.80
$359.20K
Chao Albert
1 Dec 2021
President & CEO
Sold after exercise
4,300
$93.98
$404.11K
Chao Albert
1 Dec 2021
President & CEO
Sold after exercise
4,200
$92.78
$389.68K
Chao Albert
1 Dec 2021
President & CEO
Sold after exercise
5,842
$91.83
$536.47K
Chao Albert
1 Dec 2021
President & CEO
Sold after exercise
3,000
$90.47
$271.41K
Chao Albert
1 Dec 2021
President & CEO
Sold after exercise
9,656
$89.47
$863.92K
Bender Mark Steven
12 Mar 2021
EVP and CFO
Sold after exercise
5,820
$95.23
$554.24K
Bender Mark Steven
12 Mar 2021
EVP and CFO
Sold after exercise
9,920
$94.39
$936.35K
Bender Mark Steven
9 Mar 2021
EVP and CFO
Sold after exercise
25,811
$92.27
$2.38M
Buesinger Robert F.
8 Mar 2021
EVP, Vinyl Products
Sold after exercise
7,861
$95.00
$746.80K
Buesinger Robert F.
8 Mar 2021
EVP, Vinyl Products
Sold after exercise
8,652
$92.50
$800.31K
Zoeller Johnathan Stevan
25 Feb 2021
VP and CAO
Sold after exercise
1,006
$86.94
$87.46K
Teel Lawrence E.
25 Feb 2021
EVP and Special Advisor to CEO
Sold after exercise
4,902
$87.14
$427.16K
Teel Lawrence E.
25 Feb 2021
EVP and Special Advisor to CEO
Sold after exercise
28,547
$86.93
$2.48M
Buesinger Robert F.
24 Nov 2020
EVP, Vinyl Products
Sold after exercise
4,581
$77.50
$355.03K
Chao Albert
6 Nov 2020
President & CEO
Sold after exercise
4,198
$75.12
$315.35K
Chao Albert
6 Nov 2020
President & CEO
Sold after exercise
10,334
$74.29
$767.71K
Chao Albert
6 Nov 2020
President & CEO
Sold after exercise
11,978
$73.30
$877.99K
Chao Albert
6 Nov 2020
President & CEO
Sold after exercise
28,638
$72.08
$2.06M
Bender Mark Steven
5 Nov 2020
EVP and CFO
Sold after exercise
420
$74.54
$31.31K
Bender Mark Steven
5 Nov 2020
EVP and CFO
Sold after exercise
24,576
$73.98
$1.82M
Chao Albert
21 Feb 2020
President & CEO
Sold after exercise
51,592
$62.42
$3.22M
Jenkins Dorothy C
20 Aug 2019
Director
Sold after exercise
390
$62.30
$24.30K
Chao Albert
16 Nov 2018
President & CEO
Sold after exercise
7,120
$72.09
$513.30K
Chao Albert
16 Nov 2018
President & CEO
Sold after exercise
17,389
$71.62
$1.25M
Chao Albert
15 Nov 2018
President & CEO
Sold after exercise
1,100
$71.98
$79.18K
Chao Albert
15 Nov 2018
President & CEO
Sold after exercise
16,309
$71.48
$1.17M
Chao Albert
15 Nov 2018
President & CEO
Sold after exercise
7,100
$70.43
$500.06K
Chao Albert
14 Nov 2018
President & CEO
Sold after exercise
900
$72.50
$65.25K
Chao Albert
14 Nov 2018
President & CEO
Sold after exercise
13,202
$71.77
$947.49K
Chao Albert
14 Nov 2018
President & CEO
Sold after exercise
10,519
$70.92
$745.95K
Chao Albert
13 Nov 2018
President & CEO
Sold after exercise
1,200
$73.20
$87.84K
Chao Albert
13 Nov 2018
President & CEO
Sold after exercise
3,600
$72.47
$260.89K
Chao Albert
13 Nov 2018
President & CEO
Sold after exercise
10,200
$71.28
$727.06K
Chao Albert
12 Nov 2018
President & CEO
Sold after exercise
6,900
$75.10
$518.19K
Chao Albert
12 Nov 2018
President & CEO
Sold after exercise
18,100
$74.30
$1.34M
Bender Mark Steven
21 May 2018
EVP and CFO
Sold after exercise
261
$123.59
$32.26K
Bender Mark Steven
21 May 2018
EVP and CFO
Sold after exercise
9,505
$123.04
$1.17M
Bender Mark Steven
21 May 2018
EVP and CFO
Sold after exercise
2,300
$121.90
$280.37K
Bender Mark Steven
11 May 2018
EVP and CFO
Sold after exercise
23,506
$117.33
$2.76M
Jenkins Dorothy C
10 May 2018
Director
Sold after exercise
52
$117.01
$6.08K
Kenner Andrew
9 Mar 2018
SVP - Chemical Manufacturing
Sold after exercise
6,028
$120.00
$723.36K
Kenner Andrew
5 Mar 2018
SVP - Chemical Manufacturing
Sold after exercise
24,318
$110.61
$2.69M
Buesinger Robert F.
5 Mar 2018
EVP, Vinyl Products
Sold after exercise
4,034
$113.00
$455.84K
Buesinger Robert F.
5 Mar 2018
EVP, Vinyl Products
Sold after exercise
15,315
$113.05
$1.73M
Mangieri George J
28 Feb 2018
SVP & Chief Accounting Officer
Sold after exercise
4,335
$111.22
$482.14K
Teel Lawrence E.
26 Feb 2018
EVP, Olefins
Sold after exercise
9,351
$111.86
$1.05M
Ederington L. Benjamin
22 Feb 2018
SVP, GC, CAO and Secretary
Sold after exercise
6,942
$111.45
$773.67K
Bender Mark Steven
4 Dec 2017
EVP and CFO
Sold after exercise
6,500
$97.83
$635.90K
Chao Albert
29 Nov 2017
President & CEO
Sold after exercise
16,844
$95.25
$1.60M
Chao Albert
28 Nov 2017
President & CEO
Sold after exercise
1,010
$94.85
$95.80K
Chao Albert
28 Nov 2017
President & CEO
Sold after exercise
23,990
$94.55
$2.27M
Chao Albert
27 Nov 2017
President & CEO
Sold after exercise
2,966
$94.25
$279.53K
Chao Albert
27 Nov 2017
President & CEO
Sold after exercise
22,034
$93.92
$2.07M
Chao James
24 Nov 2017
Chairman
Sold after exercise
66,026
$94.61
$6.25M
Chao Albert
24 Nov 2017
President & CEO
Sold after exercise
20,000
$94.58
$1.89M
Chao James
22 Nov 2017
Chairman
Sold after exercise
10,109
$95.20
$962.41K
Chao Albert
22 Nov 2017
President & CEO
Sold after exercise
101
$95.60
$9.66K
Chao Albert
22 Nov 2017
President & CEO
Sold after exercise
24,899
$94.89
$2.36M
Chao Albert
21 Nov 2017
President & CEO
Sold after exercise
25,000
$94.34
$2.36M
Buesinger Robert F.
17 Nov 2017
EVP, Vinyls Products
Sold after exercise
5,214
$93.82
$489.20K
Mangieri George J
13 Nov 2017
SVP & Chief Accounting Officer
Sold after exercise
2,915
$94.70
$276.05K
Mangieri George J
13 Nov 2017
SVP & Chief Accounting Officer
Sold after exercise
10,466
$94.37
$987.72K
Teel Lawrence E.
13 Nov 2017
EVP, Olefins
Sold after exercise
800
$93.99
$75.19K
Teel Lawrence E.
13 Nov 2017
EVP, Olefins
Sold after exercise
11,912
$93.99
$1.12M
Bender Mark Steven
13 Nov 2017
EVP and CFO
Sold after exercise
600
$94.60
$56.76K
Bender Mark Steven
13 Nov 2017
EVP and CFO
Sold after exercise
29,204
$94.01
$2.75M
Buesinger Robert F.
1 Mar 2017
Sr. Vice President, Vinyls
Sold after exercise
8,193
$66.25
$542.79K
Chao Albert
23 Feb 2017
President & CEO
Sold after exercise
42,180
$63.35
$2.67M
Mattina Michael J.
15 Nov 2016
Sr. VP, Polyethylene
Sold after exercise
18,274
$53.78
$982.78K
Buesinger Robert F.
10 Nov 2016
Sr. Vice President, Vinyls
Sold after exercise
2,880
$54.42
$156.74K
Show all 236 transactions →

What was left out

Form 4 filings counted 527
Amendments (4/A) skipped 24
Filings about a different issuer 1
Unreadable filings 0
Joint filings 0
Sales on a Rule 10b5-1 plan 0
Sales straight out of an exercise 103
Sales at will 51
Transactions with no price 0
Shares from compensation/vesting 4,040,969
Sales filed before the plan box existed 38
History held since 6 Sep 2016