Insider trading

Period: 120 months Stock: WLK Share of holding: 50% or more × + 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.

23 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.

23 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.

23 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.

23 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.
23 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
23 decisions over 120 months Remove this filter
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.

23 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
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
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
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
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
25 Feb 2021
Sold, plan not stated
$87.46K 1,006 at 86.94
100%
Sold half or more
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
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
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
LUKENS MAX L Director
Sold, plan not stated 2×
$1.95M 17,558 at 110.93
84.3%
Sold half or more
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
17 Nov 2016
Chao Albert President & CEO · indirect
Sold, plan not stated 2×
$538.46K 10,000 at 53.85
100%
Sold half or more
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 Albert President & CEO · indirect
Sold, plan not stated
$544.45K 10,000 at 54.45
50.0%
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
Showing 1–23 of 23.