Insider trading

Period: 120 months Stock: WLK Minimum amount: $1M × + Add filter Clear all
Views & alerts

Save your view. Keep the filter you have built, and get an email when a new filing matches it. A free account does both.

When

Period

How far back the list reaches. Filings arrive days after the trade, so the newest rows always lag a little.

54 decisions over 120 months
Who

Role

The position the person holds at the company, read from the title on the filing. A chief executive who is also a director counts as the chief executive.

54 decisions over 120 months
The trade

Type of trade

Purchases, sales, or cluster buys: companies where 3 or more insiders bought within 30 days. The number beside each is what that choice would give.

54 decisions over 120 months
The trade

Minimum amount

Hides rows under this value. The amount is the shares traded times the price on the filing.

54 decisions over 120 months Remove this filter
The trade

Plan

  • Discretionary: they chose to sell that week.
  • Scheduled: a 10b5-1 plan fixed the sale months in advance, so the timing says nothing about what they knew.
  • Not stated: filed before the SEC added the box in April 2023, which is most of the older half of this database.
54 decisions over 120 months
The trade

Share of their own holding

How much of what they already held the trade moved. Selling a tenth of a stake is not the same act as selling all of it.

At least
54 decisions over 120 months
Ownership

What the chief executive holds

The value of the chief executive’s stock measured against base salary. The salary comes from the company’s own proxy. Companies with no figure are in neither direction.

54 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
11 Aug 2026
Chao Albert Executive Chairman
Sold at will 2×
$3.12M 38,873 at 80.28
5.7%
Not planned
27 Mar 2026
Bender Mark Steven EVP & CFO
Sold at will
$1.85M 16,413 at 112.54
36.9%
Not planned
27 Feb 2026
Bender Mark Steven EVP & CFO
Sold at will 2×
$1.76M 17,409 at 100.92
28.2%
Not planned
22 Dec 2025
Chao Albert Executive Chairman
Sold at will 3×
$3.00M 40,836 at 73.57
6.1%
Not planned
27 May 2022
Buesinger Robert F. EVP, HIP, IT & Digital
Sold, plan not stated
$1.87M 14,427 at 129.47
55.1%
Sold half or more
19 May 2022
Chao Albert President & CEO
Sold, plan not stated 3×
$4.94M 37,876 at 130.38
7.4%
17 May 2022
Kearns Roger L. COO and EVP - PEM
Sold, plan not stated
$1.14M 8,388 at 136.24
24.1%
5 May 2022
Ederington L. Benjamin EVP, GC, CAO and Secretary
Sold, plan not stated 2×
$1.76M 12,569 at 139.81
25.1%
25 Mar 2022
Kearns Roger L. COO and EVP - PEM
Sold, plan not stated 2×
$1.30M 10,333 at 126.00
28.1%
25 Mar 2022
Bender Mark Steven EVP and CFO
Sold, plan not stated 2×
$1.00M 8,000 at 125.34
20.7%
24 Mar 2022
Bender Mark Steven EVP and CFO
Sold, plan not stated
$1.00M 8,000 at 125.38
20.7%
10 Mar 2022
Buesinger Robert F. EVP, HIP, IT & Digital
Sold, plan not stated
$2.65M 22,555 at 117.61
60.3%
Sold half or more
2 Dec 2021
Chao Albert President & CEO
Sold, plan not stated 4×
$2.83M 30,787 at 91.85
6.5%
1 Dec 2021
Chao Albert President & CEO
Sold, plan not stated 6×
$2.82M 30,787 at 91.75
6.5%
12 Mar 2021
Bender Mark Steven EVP and CFO
Sold, plan not stated 2×
$1.49M 15,740 at 94.70
33.4%
9 Mar 2021
Bender Mark Steven EVP and CFO
Sold, plan not stated
$2.38M 25,811 at 92.27
45.1%
8 Mar 2021
Buesinger Robert F. EVP, Vinyl Products
Sold, plan not stated 2×
$1.55M 16,513 at 93.69
55.4%
Sold half or more
25 Feb 2021
Teel Lawrence E. EVP and Special Advisor to CEO
Sold, plan not stated 2×
$2.91M 33,449 at 86.96
87.2%
Sold half or more
6 Nov 2020
Chao Albert President & CEO
Sold, plan not stated 4×
$4.03M 55,148 at 72.99
11.4%
5 Nov 2020
Bender Mark Steven EVP and CFO
Sold, plan not stated 2×
$1.85M 24,996 at 73.99
45.9%
27 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 4×
$6.25M 160,000 at 39.08
0.3%
First buy on file
26 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 3×
$5.95M 145,000 at 41.00
0.3%
First buy on file
25 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 6×
$5.30M 130,000 at 40.77
0.3%
First buy on file
24 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 4×
$5.30M 145,000 at 36.53
0.3%
First buy on file
19 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 4×
$3.85M 101,664 at 37.87
0.2%
First buy on file
18 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 5×
$7.55M 228,336 at 33.04
0.5%
First buy on file
17 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 6×
$5.49M 165,000 at 33.25
0.4%
First buy on file
16 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 3×
$5.03M 160,000 at 31.42
0.3%
First buy on file
13 Mar 2020
TTWFGP LLC 10% owner · indirect
Bought 2×
$5.27M 160,000 at 32.94
0.3%
First buy on file
21 Feb 2020
Chao Albert President & CEO
Sold, plan not stated
$3.22M 51,592 at 62.42
12.2%
16 Nov 2018
Chao Albert President & CEO
Sold, plan not stated 2×
$1.76M 24,509 at 71.75
7.0%
15 Nov 2018
Chao Albert President & CEO
Sold, plan not stated 3×
$1.74M 24,509 at 71.20
7.1%
14 Nov 2018
Chao Albert President & CEO
Sold, plan not stated 3×
$1.76M 24,621 at 71.43
7.3%
13 Nov 2018
Chao Albert President & CEO
Sold, plan not stated 3×
$1.08M 15,000 at 71.72
4.7%
12 Nov 2018
Chao Albert President & CEO
Sold, plan not stated 2×
$1.86M 25,000 at 74.52
7.8%
24 May 2018
Chao James Chairman
Sold, plan not stated
$4.02M 33,305 at 120.69
39.3%
21 May 2018
Bender Mark Steven EVP and CFO
Sold, plan not stated 3×
$1.48M 12,066 at 122.83
43.3%
11 May 2018
Bender Mark Steven EVP and CFO
Sold, plan not stated
$2.76M 23,506 at 117.33
59.8%
Sold half or more
5 Mar 2018
Kenner Andrew SVP - Chemical Manufacturing
Sold, plan not stated
$2.69M 24,318 at 110.61
63.4%
Sold half or more
5 Mar 2018
Buesinger Robert F. EVP, Vinyl Products
Sold, plan not stated 2×
$2.19M 19,349 at 113.04
82.6%
Sold half or more
26 Feb 2018
Teel Lawrence E. EVP, Olefins
Sold, plan not stated
$1.05M 9,351 at 111.86
81.5%
Sold half or more
22 Feb 2018
LUKENS MAX L Director
Sold, plan not stated 2×
$1.95M 17,558 at 110.93
84.3%
Sold half or more
29 Nov 2017
Chao Albert President & CEO
Sold, plan not stated
$1.60M 16,844 at 95.25
5.8%
28 Nov 2017
Chao Albert President & CEO
Sold, plan not stated 2×
$2.36M 25,000 at 94.56
8.4%
27 Nov 2017
Chao Albert President & CEO
Sold, plan not stated 2×
$2.35M 25,000 at 93.96
8.4%
24 Nov 2017
Chao James Chairman
Sold, plan not stated
$6.25M 66,026 at 94.61
35.7%
24 Nov 2017
Chao Albert President & CEO
Sold, plan not stated
$1.89M 20,000 at 94.58
6.8%
22 Nov 2017
Chao Albert President & CEO
Sold, plan not stated 2×
$2.37M 25,000 at 94.90
8.4%
21 Nov 2017
Chao Albert President & CEO
Sold, plan not stated
$2.36M 25,000 at 94.34
8.4%
21 Nov 2017
Bender Mark Steven EVP and CFO
Sold, plan not stated
$1.92M 20,382 at 94.27
45.9%
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