WESTLAKE CORP (WLK)

Latest Insider Confidence Score

2026Q1

49.2
Bearish

Company insider confidence (by quarter)

2013Q3 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Chao Catherine T. — 93,405,554 Aug 14, 2023
Ttwfgp Llc 10% Owner 47,400,277 Mar 30, 2020
Wpt Llc — 2,872,230 Jul 29, 2014
Westlake Chemical Corp — 2,872,230 Jul 29, 2014
Westlake Polymers Llc — 2,872,230 Jul 29, 2014

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Feb 16, 2022 Mar 6, 2026 Bender Mark Steven CFO Sell 42.5 -1,171 -4.37% ✗ $122.9K
Feb 27, 2026 Mar 2, 2026 Bender Mark Steven CFO Sell 17.5 -30,102 -40.39% ✗ $3M
Feb 20, 2026 Feb 24, 2026 Patel Bhavesh V. Director Neutral 52.5 - 0.00% ✗ -
Feb 23, 2026 Patel Bhavesh V. Director Neutral 52.5 - 0.00% ✗ -
Feb 19, 2026 Feb 23, 2026 Szwejbka Scott Thomas SVP, HIP Segment Head Sell 77.5 +274 2.03% ✗ $8.6K
Feb 19, 2026 Feb 23, 2026 Holy Jeffrey Adam VP and CAO Sell 82.5 +183 3.70% ✗ $7.6K
Feb 20, 2026 Feb 23, 2026 Gilson Jean-Marc CEO Neutral 52.5 - 0.00% ✗ -
Feb 19, 2026 Feb 23, 2026 Ederington L. Benjamin EVP, Legal & External Affairs Sell 78.8 +1,068 1.35% ✗ $33.6K
Feb 19, 2026 Feb 23, 2026 Buesinger Robert F. EVP, PEM Segment Head Sell 83.8 +975 2.60% ✗ $30.7K
Feb 19, 2026 Feb 23, 2026 Bender Mark Steven CFO Sell 78.8 +1,332 2.20% ✗ $41.9K
Feb 19, 2026 Feb 23, 2026 Chao John Tsung-chen Director Sell 77.5 +122 1.57% ✗ $8.6K
Feb 19, 2026 Feb 23, 2026 Chao Albert Chair Sell 72.5 +3,692 0.58% ✗ $235.3K
Feb 19, 2026 Feb 23, 2026 Chao James Chair Sell 87.5 +2,315 4.88% ✗ $147.6K
Feb 17, 2026 Feb 19, 2026 Szwejbka Scott Thomas SVP, HIP Segment Head Sell 26.3 -295 -2.14% ✗ $29.2K
Feb 17, 2026 Feb 19, 2026 Holy Jeffrey Adam VP and CAO Sell 26.3 -213 -4.13% ✗ $21.1K
Feb 17, 2026 Feb 19, 2026 Ederington L. Benjamin EVP, Legal & External Affairs Sell 22.5 -978 -1.22% ✗ $96.8K
Feb 17, 2026 Feb 19, 2026 Chao James Chair Sell 20.0 -2,664 -5.31% ✗ $263.6K
Feb 17, 2026 Feb 19, 2026 Chao John Tsung-chen Director Sell 26.3 -242 -3.02% ✗ $23.9K
Feb 17, 2026 Feb 19, 2026 Chao Albert Chair Sell 30.0 -5,089 -0.79% ✗ $503.6K
Feb 17, 2026 Feb 19, 2026 Buesinger Robert F. EVP, PEM Segment Head Sell 22.5 -903 -2.35% ✗ $89.4K
Feb 17, 2026 Feb 19, 2026 Bender Mark Steven CFO Sell 22.5 -1,209 -1.96% ✗ $119.6K
Dec 22, 2025 Dec 23, 2025 Chao Albert Chair Sell 17.5 -40,836 -6.11% ✗ $3M
Dec 10, 2025 Dec 10, 2025 CREGG ROGER A Director Neutral 52.5 - 0.00% ✗ -
Oct 1, 2025 Oct 3, 2025 Szwejbka Scott Thomas SVP, HIP Segment Head Sell 20.0 -3,842 -23.06% ✗ $294.7K
Aug 28, 2025 Aug 29, 2025 Chao James Chair Neutral 27.5 -15,140 -27.59% ✗ -
Aug 9, 2025 Aug 11, 2025 Graff Michael J Director Neutral 52.5 - 0.00% ✗ -
Aug 9, 2025 Aug 11, 2025 Chao Catherine T. Director Neutral 52.5 - 0.00% ✗ -
Aug 9, 2025 Aug 11, 2025 Chao David Tsung-Hung Director Neutral 52.5 - 0.00% ✗ -
Aug 9, 2025 Aug 11, 2025 NORTHCUTT R BRUCE Director Neutral 52.5 - 0.00% ✗ -
Aug 9, 2025 Aug 11, 2025 Sabat Carolyn Chao Director Neutral 52.5 - 0.00% ✗ -
Aug 9, 2025 Aug 11, 2025 MCCOLLUM MARK A Director Neutral 52.5 - 0.00% ✗ -
Aug 9, 2025 Aug 11, 2025 Lubel Kimberly S Director Neutral 52.5 - 0.00% ✗ -
Aug 8, 2025 Aug 11, 2025 CREGG ROGER A Director Neutral 52.5 - 0.00% ✗ -
Aug 9, 2025 Aug 11, 2025 Sheets Jeffrey Wayne Director Neutral 52.5 - 0.00% ✗ -
Apr 22, 2025 Jun 9, 2025 Buesinger Robert F. EVP, PEM Segment Head Buy 52.5 - 0.00% ✗ $1.7K
Apr 11, 2025 Apr 15, 2025 Buesinger Robert F. EVP, PEM Neutral 52.5 - 0.00% ✗ -
Apr 11, 2025 Apr 15, 2025 Szwejbka Scott Thomas SVP, HIP Neutral 52.5 - 0.00% ✗ -
Apr 14, 2025 Szwejbka Scott Thomas SVP, HIP Neutral 52.5 - 0.00% ✗ -
Feb 20, 2025 Mar 7, 2025 Chao John Tsung-chen Director Sell 83.8 +564 3.99% ✗ $42.5K
Feb 18, 2025 Mar 6, 2025 Chao John Tsung-chen Director Sell 46.3 -235 -3.07% ✗ $25.5K
Feb 28, 2025 Mar 4, 2025 Gilson Jean-Marc CEO Neutral 52.5 - 0.00% ✗ -
Feb 21, 2025 Feb 24, 2025 Gilson Jean-Marc CEO Neutral 52.5 - 0.00% ✗ -
Feb 20, 2025 Feb 24, 2025 Chao John Tsung-chen Director Neutral 90.0 +955 14.23% ✗ -
Feb 20, 2025 Feb 24, 2025 Holy Jeffrey Adam VP and CAO Sell 91.3 +965 27.71% ✗ $37.7K
Feb 20, 2025 Feb 24, 2025 Ederington L. Benjamin EVP, PEM, GC and CAO Sell 92.5 +4,381 6.10% ✗ $323.2K
Feb 20, 2025 Feb 24, 2025 Janssens Thomas J. SVP, Ops - PEM & Corp Logistic Sell 95.0 +1,838 12.02% ✗ $67K
Feb 20, 2025 Feb 24, 2025 Chao James Chair Sell 97.5 +9,821 21.80% ✗ $724.5K
Feb 20, 2025 Feb 24, 2025 Chao Albert Chair Sell 92.5 +20,066 3.54% ✗ $1.5M
Feb 20, 2025 Feb 24, 2025 Buesinger Robert F. EVP, HIP, IT & Digital Sell 97.5 +4,101 13.30% ✗ $302.7K
Feb 20, 2025 Feb 24, 2025 Bender Mark Steven CFO Sell 97.5 +5,289 10.23% ✗ $390.2K
Feb 18, 2025 Feb 20, 2025 Chao John Tsung-chen Director Neutral 52.5 - 0.00% ✗ -
Feb 18, 2025 Feb 20, 2025 Ederington L. Benjamin EVP, PEM, GC and CAO Sell 20.0 -5,268 -6.83% ✗ $587.5K
Feb 18, 2025 Feb 20, 2025 Buesinger Robert F. EVP, HIP, IT & Digital Sell 20.0 -4,015 -11.52% ✗ $447.7K
Feb 18, 2025 Feb 20, 2025 Bender Mark Steven CFO Sell 20.0 -4,446 -7.92% ✗ $495.8K
Feb 18, 2025 Feb 20, 2025 Janssens Thomas J. SVP, Ops - PEM & Corp Logistic Sell 26.3 -336 -2.15% ✗ $37.5K
Feb 18, 2025 Feb 20, 2025 Holy Jeffrey Adam VP and CAO Sell 26.3 -219 -5.92% ✗ $24.4K
Feb 18, 2025 Feb 20, 2025 Chao James Chair Sell 20.0 -2,287 -4.83% ✗ $255K
Feb 18, 2025 Feb 20, 2025 Chao Albert Chair Sell 20.0 -6,069 -1.06% ✗ $676.8K
Feb 14, 2025 Feb 19, 2025 Janssens Thomas J. SVP, Ops - PEM & Corp Logistic Sell 22.5 -790 -5.23% ✗ $91.1K
Feb 14, 2025 Feb 19, 2025 Ederington L. Benjamin EVP, PEM, GC and CAO Sell 22.5 -1,895 -2.88% ✗ $218.5K
Dec 10, 2024 Dec 10, 2024 CREGG ROGER A Director Neutral 52.5 - 0.00% ✗ -
Dec 10, 2024 CREGG ROGER A Director Neutral 52.5 - 0.00% ✗ -
Nov 29, 2024 Dec 2, 2024 Chao David Tsung-Hung Director Sell 22.5 -1,750 -6.04% ✗ $225.9K
Nov 22, 2024 Nov 25, 2024 Chao David Tsung-Hung Director Sell 22.5 -1,750 -5.70% ✗ $227.5K
Aug 30, 2024 Sep 3, 2024 Chao James Chair Neutral 27.5 -6,642 -14.70% ✗ -
Aug 23, 2024 Aug 26, 2024 Janssens Thomas J. SVP, Ops - PEM & Corp Logistic Sell 17.5 -14,864 -55.20% ✗ $2.2M
Aug 16, 2024 Aug 19, 2024 Chao Albert Chair Sell 16.3 -45,298 -7.55% ✗ $6.6M
Aug 13, 2024 Aug 15, 2024 Ederington L. Benjamin EVP, PEM, GC and CAO Sell 22.5 -1,156 -1.95% ✗ $168.1K
Aug 13, 2024 Aug 15, 2024 Bender Mark Steven CFO Sell 22.5 -1,156 -2.67% ✗ $168.1K
Aug 13, 2024 Aug 15, 2024 Buesinger Robert F. EVP, HIP, IT & Digital Sell 20.0 -2,772 -11.22% ✗ $403.2K
Aug 11, 2024 Aug 12, 2024 Sabat Carolyn Chao Director Neutral 52.5 - 0.00% ✗ -
Aug 11, 2024 Aug 12, 2024 Chao Catherine T. Director Neutral 52.5 - 0.00% ✗ -
Aug 11, 2024 Aug 12, 2024 Sheets Jeffrey Wayne Director Neutral 52.5 - 0.00% ✗ -
Aug 11, 2024 Aug 12, 2024 NORTHCUTT R BRUCE Director Neutral 52.5 - 0.00% ✗ -
Aug 11, 2024 Aug 12, 2024 Lubel Kimberly S Director Neutral 52.5 - 0.00% ✗ -
Aug 11, 2024 Aug 12, 2024 MCCOLLUM MARK A Director Neutral 52.5 - 0.00% ✗ -
Aug 11, 2024 Aug 12, 2024 Haas Marius Director Neutral 52.5 - 0.00% ✗ -
Aug 11, 2024 Aug 12, 2024 Graff Michael J Director Neutral 52.5 - 0.00% ✗ -
Aug 11, 2024 Aug 12, 2024 Chao David Tsung-Hung Director Neutral 52.5 - 0.00% ✗ -
Jul 15, 2024 Jul 16, 2024 Gilson Jean-Marc CEO Neutral 52.5 - 0.00% ✗ -
Jul 15, 2024 Gilson Jean-Marc CEO Neutral 52.5 - 0.00% ✗ -
May 9, 2024 May 13, 2024 Buesinger Robert F. EVP, HIP, IT & Digital Sell 20.0 -3,500 -16.55% ✗ $554.8K
May 12, 2024 May 13, 2024 Sabat Carolyn Chao Director Neutral 52.5 - 0.00% ✗ -
May 12, 2024 May 13, 2024 Chao Catherine T. Director Neutral 52.5 - 0.00% ✗ -
May 7, 2024 May 8, 2024 Buesinger Robert F. EVP, HIP, IT & Digital Sell 20.0 -3,133 -12.91% ✗ $493.4K
May 3, 2024 May 6, 2024 Bender Mark Steven CFO Sell 20.0 -4,950 -10.93% ✗ $753.3K
May 2, 2024 Holy Jeffrey Adam VP and CAO Neutral 52.5 - 0.00% ✗ -
Mar 28, 2024 Apr 1, 2024 Chao James Chair Neutral 27.5 -36,632 -44.77% ✗ -
Mar 21, 2024 Mar 22, 2024 Zoeller Johnathan Stevan VP and CAO Sell 22.5 -657 -12.95% ✗ $98.9K
Mar 15, 2024 Mar 18, 2024 Buesinger Robert F. EVP, HIP, IT & Digital Sell 20.0 -3,878 -15.50% ✗ $560.4K
Mar 13, 2024 Mar 14, 2024 Buesinger Robert F. EVP, HIP, IT & Digital Sell 43.8 -122 -0.49% ✗ $17.6K
Mar 7, 2024 Mar 11, 2024 Buesinger Robert F. EVP, HIP, IT & Digital Sell 17.5 -12,670 -33.51% ✗ $1.8M
Mar 8, 2024 Mar 11, 2024 Zoeller Johnathan Stevan VP and CAO Sell 20.0 -2,776 -38.60% ✗ $394.4K
Mar 6, 2024 Mar 7, 2024 Bender Mark Steven CFO Sell 20.0 -4,804 -9.59% ✗ $677.5K
Feb 26, 2024 Feb 28, 2024 Bender Mark Steven CFO Sell 20.0 -4,854 -8.83% ✗ $667.8K
Feb 16, 2024 Feb 21, 2024 Zoeller Johnathan Stevan VP and CAO Sell 90.0 +990 8.11% ✗ $97.5K
Feb 16, 2024 Feb 21, 2024 Janssens Thomas J. SVP, Ops - PEM & Corp Logistic Sell 87.5 +1,362 3.92% ✗ $128.6K
Feb 16, 2024 Feb 21, 2024 Ederington L. Benjamin EVP, PEM, GC and CAO Sell 85.0 +4,184 1.50% ✗ $603K
Feb 16, 2024 Feb 21, 2024 Chao James Chair Sell 92.5 +8,652 2.68% ✗ $1.7M
Feb 16, 2024 Feb 21, 2024 Chao Albert CEO Sell 77.5 +14,958 0.68% ✗ $3.2M