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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

42
Insider
Date
Role
Action
Shares
Price
Amount
Janssens Thomas J.
23 Aug 2024
SVP, Ops - PEM & Corp Logistic
Exercised, kept
4,020
$86.54
$347.88K
Janssens Thomas J.
23 Aug 2024
SVP, Ops - PEM & Corp Logistic
Exercised, kept
6,507
$65.81
$428.24K
Janssens Thomas J.
23 Aug 2024
SVP, Ops - PEM & Corp Logistic
Exercised, kept
4,337
$79.83
$346.22K
Chao Albert
16 Aug 2024
Executive Chairman
Exercised, kept
45,298
$68.09
$3.08M
Buesinger Robert F.
7 May 2024
EVP, HIP, IT & Digital
Exercised, kept
3,133
$122.65
$384.26K
Zoeller Johnathan Stevan
21 Mar 2024
VP and CAO
Exercised, kept
68
$122.65
$8.34K
Zoeller Johnathan Stevan
21 Mar 2024
VP and CAO
Exercised, kept
296
$108.12
$32.00K
Zoeller Johnathan Stevan
21 Mar 2024
VP and CAO
Exercised, kept
293
$86.54
$25.36K
Zoeller Johnathan Stevan
8 Mar 2024
VP and CAO
Exercised, kept
649
$122.65
$79.60K
Zoeller Johnathan Stevan
8 Mar 2024
VP and CAO
Exercised, kept
1,408
$108.12
$152.23K
Zoeller Johnathan Stevan
8 Mar 2024
VP and CAO
Exercised, kept
719
$86.54
$62.22K
Buesinger Robert F.
7 Mar 2024
EVP, HIP, IT & Digital
Exercised, kept
7,665
$108.12
$828.72K
Buesinger Robert F.
7 Mar 2024
EVP, HIP, IT & Digital
Exercised, kept
5,005
$86.54
$433.12K
Chao James
30 Nov 2023
Chairman
Exercised, kept
9,177
$108.12
$992.19K
Chao James
30 Nov 2023
Chairman
Exercised, kept
24,437
$86.54
$2.11M
Chao James
30 Nov 2023
Chairman
Exercised, kept
34,599
$65.81
$2.28M
Chao Albert
31 Aug 2023
President & CEO
Exercised, kept
19,988
$63.98
$1.28M
Chao James
31 Aug 2023
Chairman
Exercised, kept
43,738
$65.81
$2.88M
Chao James
31 Aug 2023
Chairman
Exercised, kept
55,766
$79.83
$4.45M
Chao James
31 Aug 2023
Chairman
Exercised, kept
35,321
$107.75
$3.81M
Chao James
31 Aug 2023
Chairman
Exercised, kept
62,197
$61.87
$3.85M
Chao James
31 Aug 2023
Chairman
Exercised, kept
47,569
$44.42
$2.11M
Buesinger Robert F.
30 Aug 2023
EVP, HIP, IT & Digital
Exercised, kept
4,857
$86.54
$420.31K
Chao Albert
30 Aug 2023
President & CEO
Exercised, kept
20,000
$63.98
$1.28M
Ederington L. Benjamin
30 Aug 2023
EVP, PEM, GC and CAO
Exercised, kept
13,734
$61.87
$849.65K
Chao James
30 Aug 2023
Chairman
Exercised, kept
17,735
$44.42
$787.79K
Chao James
30 Aug 2023
Chairman
Exercised, kept
12,321
$68.09
$838.94K
Janssens Thomas J.
29 Aug 2023
SVP, Ops - PEM & Corp Logistic
Exercised, kept
1,370
$108.12
$148.12K
Janssens Thomas J.
29 Aug 2023
SVP, Ops - PEM & Corp Logistic
Exercised, kept
2,485
$107.75
$267.76K
Buesinger Robert F.
29 Aug 2023
EVP, HIP, IT & Digital
Exercised, kept
8,100
$65.81
$533.08K
Bender Mark Steven
7 Aug 2023
EVP & CFO
Exercised, kept
12,606
$86.54
$1.09M
Bender Mark Steven
7 Aug 2023
EVP & CFO
Exercised, kept
12,033
$107.75
$1.30M
Zoeller Johnathan Stevan
19 May 2023
VP and CAO
Exercised, kept
1,963
$86.54
$169.87K
Bender Mark Steven
8 May 2023
EVP & CFO
Exercised, kept
1,084
$65.81
$71.34K
Bender Mark Steven
27 Feb 2023
EVP and CFO
Exercised, kept
3,000
$65.81
$197.44K
Zoeller Johnathan Stevan
27 Feb 2023
VP and CAO
Exercised, kept
1,038
$65.81
$68.31K
Zoeller Johnathan Stevan
27 Feb 2023
VP and CAO
Exercised, kept
651
$79.83
$51.97K
Chao James
2 Dec 2021
Chairman
Exercised, kept
16,420
$30.05
$493.46K
Bender Mark Steven
24 Mar 2021
EVP and CFO
Exercised, kept
4,000
$79.83
$319.32K
Bender Mark Steven
23 Mar 2021
EVP and CFO
Exercised, kept
3,000
$79.83
$239.49K
Chao Albert
21 Feb 2020
President & CEO
Exercised, kept
57,800
$10.26
$593.03K
Jenkins Dorothy C
14 Aug 2017
Director
Exercised, kept
3,840
$13.56
$52.08K
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