Insider trading

Period: 120 months Stock: WLK Role: Other officers × + Add filter Clear all
Views & alerts

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When

Period

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

49 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.

49 decisions over 120 months Remove this filter
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.

49 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.

49 decisions over 120 months
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.
49 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
49 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.

49 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
Buesinger Robert F. EVP, PEM Segment Head
Sold at will
$461.00K 4,000 at 115.25
10.4%
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 2025
Buesinger Robert F. EVP, PEM Segment Head · indirect
Sold at will
$6.03K 83 at 72.70
100%
Sold half or more
22 Apr 2025
Buesinger Robert F. EVP, PEM Segment Head · indirect
Bought
$7.75K 83 at 93.39
opened
First buy on file
9 May 2024
Buesinger Robert F. EVP, HIP, IT & Digital
Sold at will
$554.75K 3,500 at 158.50
16.6%
Not planned
15 Mar 2024
Buesinger Robert F. EVP, HIP, IT & Digital
Sold at will
$560.37K 3,878 at 144.50
15.5%
Not planned
13 Mar 2024
Buesinger Robert F. EVP, HIP, IT & Digital
Sold at will
$17.63K 122 at 144.50
0.5%
Not planned
15 Nov 2023
Buesinger Robert F. EVP, HIP, IT & Digital
Sold at will
$550.06K 4,215 at 130.50
20.1%
Not planned
31 Aug 2022
Buesinger Robert F. EVP, HIP, IT & Digital
Sold, plan not stated
$98.94K 1,000 at 98.94
8.9%
26 Aug 2022
Zoeller Johnathan Stevan VP & Chief Accounting Officer
Sold, plan not stated
$58.04K 542 at 107.08
50.0%
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
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%
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
9 Mar 2022
Buesinger Robert F. EVP, HIP, IT & Digital
Sold, plan not stated
$315.45K 2,730 at 115.55
15.5%
1 Mar 2022
Sold, plan not stated
$111.05K 1,006 at 110.39
46.5%
10 May 2021
Buesinger Robert F. EVP, Vinyl Products
Sold, plan not stated
$525.00K 5,000 at 105.00
37.8%
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
Sold, plan not stated
$87.46K 1,006 at 86.94
100%
Sold half or more
24 Nov 2020
Buesinger Robert F. EVP, Vinyl Products
Sold, plan not stated
$355.03K 4,581 at 77.50
30.2%
23 Nov 2020
Kenner Andrew SVP - Chemical Manufacturing
Sold, plan not stated
$442.82K 5,924 at 74.75
34.1%
16 Mar 2020
Kearns Roger L. EVP, Vinyls Chemicals
Bought
$149.45K 5,000 at 29.89
54.2%
First buy on file
8 Nov 2019
Mangieri George J SVP & Chief Accounting Officer
Sold, plan not stated
$118.80K 1,583 at 75.05
50.0%
Sold half or more
24 May 2018
Chao James Chairman
Sold, plan not stated
$4.02M 33,305 at 120.69
39.3%
15 May 2018
Buesinger Robert F. EVP, Vinyl Products
Sold, plan not stated
$172.01K 1,447 at 118.88
35.4%
9 Mar 2018
Kenner Andrew SVP - Chemical Manufacturing
Sold, plan not stated
$723.36K 6,028 at 120.00
34.5%
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
5 Mar 2018
Mangieri George J SVP & Chief Accounting Officer
Sold, plan not stated
$245.08K 2,161 at 113.41
50.0%
Sold half or more
28 Feb 2018
Mangieri George J SVP & Chief Accounting Officer
Sold, plan not stated
$482.14K 4,335 at 111.22
50.1%
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
Ederington L. Benjamin SVP, GC, CAO and Secretary
Sold, plan not stated
$773.67K 6,942 at 111.45
36.6%
1 Dec 2017
Buesinger Robert F. EVP, Vinyls Products
Sold, plan not stated
$263.39K 2,674 at 98.50
28.7%
24 Nov 2017
Chao James Chairman
Sold, plan not stated
$6.25M 66,026 at 94.61
35.7%
22 Nov 2017
Chao James Chairman
Sold, plan not stated
$962.41K 10,109 at 95.20
7.8%
17 Nov 2017
Buesinger Robert F. EVP, Vinyls Products
Sold, plan not stated
$489.20K 5,214 at 93.82
35.9%
13 Nov 2017
Mangieri George J SVP & Chief Accounting Officer
Sold, plan not stated 2×
$1.26M 13,381 at 94.44
78.5%
Sold half or more
13 Nov 2017
Teel Lawrence E. EVP, Olefins
Sold, plan not stated 2×
$1.19M 12,712 at 93.99
94.1%
Sold half or more
17 May 2017
Mangieri George J VP & Chief Accounting Officer
Sold, plan not stated
$409.20K 6,578 at 62.21
50.0%
Sold half or more
1 Mar 2017
Buesinger Robert F. Sr. Vice President, Vinyls
Sold, plan not stated
$542.79K 8,193 at 66.25
46.8%
17 Nov 2016
Chao James Chairman · indirect
Sold, plan not stated 2×
$538.46K 10,000 at 53.85
100%
Sold half or more
16 Nov 2016
Chao James Chairman · indirect
Sold, plan not stated
$544.45K 10,000 at 54.45
50.0%
Sold half or more
15 Nov 2016
Mattina Michael J. Sr. VP, Polyethylene
Sold, plan not stated
$982.78K 18,274 at 53.78
75.1%
Sold half or more
15 Nov 2016
Chao James Chairman · indirect
Sold, plan not stated
$530.60K 10,000 at 53.06
33.3%
14 Nov 2016
Chao James Chairman · indirect
Sold, plan not stated
$528.44K 10,000 at 52.84
25.0%
11 Nov 2016
Mangieri George J VP & Chief Accounting Officer
Sold, plan not stated
$301.37K 5,696 at 52.91
31.3%
10 Nov 2016
Buesinger Robert F. Sr. Vice President, Vinyls
Sold, plan not stated
$156.74K 2,880 at 54.42
26.1%
Showing 1–49 of 49.