Westlake Corporation (WLK) has 20 known insider and institutional holders on record. The largest holder is Chao Albert with 645,381 shares. Other notable holders include TTWFGP LLC and Ederington L. Benjamin.
Over the last 12 months, insiders have made 67 transactions in WLK stock — 31 buys (valued at $7.75K) and 3 sells (valued at $2.31M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
WLK Insider Ownership
Top Holder
Chao Albert
645,381 shares
Buys (12 mo)
31
$7.75K value
Sells (12 mo)
3
$2.31M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Chao Albert |
Executive Chairman |
645,381 |
2026-02-23 |
|
| 2 |
Ttwfgp Llc |
10 Percent Owner |
160,000 |
2020-08-20 |
|
| 3 |
Ederington L. Benjamin |
EVP, Legal & External Affairs |
80,515 |
2026-02-23 |
|
| 4 |
Chao James |
Senior Chairman |
51,343 |
2026-02-23 |
|
| 5 |
Kearns Roger L. |
COO and EVP, Pem |
45,785 |
2023-03-15 |
|
| 6 |
Buesinger Robert F. |
EVP, Pem Segment Head |
34,482 |
2026-03-31 |
|
| 7 |
Gilson Jean-marc |
President and CEO |
29,784 |
2026-02-23 |
|
| 8 |
Bender Mark Steven |
EVP & CFO |
28,015 |
2026-03-30 |
|
| 9 |
Kenner Andrew |
SVP, Operations |
20,362 |
2022-02-22 |
|
| 10 |
Janssens Thomas J. |
SVP, Ops - Pem & Corp Logistic |
17,733 |
2025-02-24 |
|
| 11 |
Szwejbka Scott Thomas |
SVP, Hip Segment Head |
13,864 |
2026-02-23 |
|
| 12 |
Chao John Tsung-chen |
Director |
7,979 |
2026-02-23 |
|
| 13 |
Holy Jeffrey Adam |
VP and CAO |
5,205 |
2026-02-23 |
|
| 14 |
Teel Lawrence E. |
EVP and Special Advisor To CEO |
4,903 |
2021-02-26 |
|
| 15 |
Mangieri George J |
VP & Chief Accounting Officer |
4,671 |
2020-02-19 |
|
| 16 |
Lukens Max L |
Director |
2,387 |
2019-08-19 |
|
| 17 |
Cregg Roger A |
Director |
2,168 |
2025-08-11 |
|
| 18 |
Mccollum Mark A |
Director |
2,168 |
2025-08-11 |
|
| 19 |
Chao David Tsung-hung |
Director |
2,168 |
2025-08-11 |
|
| 20 |
Lubel Kimberly S |
Director |
2,168 |
2025-08-11 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-02 |
Powers Brian John |
SVP, Pem Segment Head |
RSU Award |
1,961 |
- |
- |
| 2026-04-02 |
Powers Brian John |
SVP, Pem Segment Head |
Unknown |
882 |
- |
- |
| 2026-03-27 |
Buesinger Robert F. |
EVP, Pem Segment Head |
Informative Sell |
4,000 |
$115.25 |
$461K |
| 2026-03-27 |
Bender Mark Steven |
EVP & CFO |
Informative Sell |
16,413 |
$112.54 |
$1.85M |
| 2022-02-16 |
Bender Mark Steven |
EVP & CFO |
Tax Withholding of RSU |
1,171 |
$104.96 |
$122.91K |
| 2026-02-27 |
Bender Mark Steven |
EVP & CFO |
Option Exercise (Sell) |
6,199 |
$65.81 |
$407.97K |
| 2026-02-20 |
Patel Bhavesh V. |
Director |
RSU Award |
1,852 |
- |
- |
| 2026-02-20 |
Szwejbka Scott Thomas |
SVP, Hip Segment Head |
RSU Award |
3,983 |
- |
- |
| 2026-02-19 |
Szwejbka Scott Thomas |
SVP, Hip Segment Head |
RSU Award |
365 |
- |
- |
| 2026-02-20 |
Gilson Jean-marc |
President and CEO |
RSU Award |
29,784 |
- |
- |
| 2026-02-20 |
Holy Jeffrey Adam |
VP and CAO |
RSU Award |
1,199 |
- |
- |
| 2026-02-19 |
Holy Jeffrey Adam |
VP and CAO |
RSU Award |
264 |
- |
- |
| 2026-02-20 |
Chao John Tsung-chen |
Director |
RSU Award |
1,104 |
- |
- |
| 2026-02-19 |
Chao John Tsung-chen |
Director |
RSU Award |
213 |
- |
- |
| 2026-02-20 |
Ederington L. Benjamin |
EVP, Legal & External Affairs |
RSU Award |
7,002 |
- |
- |
| 2026-02-19 |
Ederington L. Benjamin |
EVP, Legal & External Affairs |
RSU Award |
1,425 |
- |
- |
| 2026-02-20 |
Patel Bhavesh V. |
Officer |
Unknown |
- |
- |
- |
| 2026-02-20 |
Buesinger Robert F. |
EVP, Pem Segment Head |
RSU Award |
5,281 |
- |
- |
| 2026-02-19 |
Buesinger Robert F. |
EVP, Pem Segment Head |
RSU Award |
1,301 |
- |
- |
| 2026-02-20 |
Bender Mark Steven |
EVP & CFO |
RSU Award |
7,747 |
- |
- |
| 2026-02-19 |
Bender Mark Steven |
EVP & CFO |
RSU Award |
1,777 |
- |
- |
| 2026-02-20 |
Chao James |
Senior Chairman |
RSU Award |
7,472 |
- |
- |
| 2026-02-19 |
Chao James |
Senior Chairman |
RSU Award |
3,884 |
- |
- |
| 2026-02-20 |
Chao Albert |
Executive Chairman |
RSU Award |
14,945 |
- |
- |
| 2026-02-19 |
Chao Albert |
Executive Chairman |
RSU Award |
6,193 |
- |
- |
