Mark Steven Bender

Companies

• Westlake CorporationChief financial officer Mar 5, 2007 to Jun 15, 2026¹
• Westlake CorporationBoard member Nov 10, 2020 to Nov 15, 2021²
• Westlake Chemical Partners LPBoard member Jul 29, 2014 to Mar 16, 2020³
• Westlake Chemical Partners LPChief financial officer Jul 29, 2014 to Mar 16, 2020³
• Westlake CorporationVice President & Treasurer Mar 22, 2006 to Jan 10, 2008⁴

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• Westlake Corporation WLK35,895 shares⁵$2.3M at $63.13May 13, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• May 13, 2026Shares withheld for tax 5,284 shares at $97.34 of Westlake Corporation⁵
• May 12, 2026Exercised options 13,164 shares of Westlake Corporation⁵
• Mar 27, 2026Sold 16,413 shares at $112.54 of Westlake Corporation⁶
• Feb 27, 2026Sold 421 shares at $101.52 of Westlake Corporation⁷
• Feb 27, 2026Sold 16,988 shares at $100.91 of Westlake Corporation⁷
• Feb 27, 2026Returned to company 12,693 shares at $98.20 of Westlake Corporation⁷
• Feb 27, 2026Exercised options 6,494 shares at $86.54 of Westlake Corporation⁷
• Feb 27, 2026Exercised options 6,199 shares at $65.81 of Westlake Corporation⁷
• Feb 20, 2026Shares withheld for tax 445 shares at $94.10 of Westlake Corporation⁸
• Feb 19, 2026Granted 1,777 shares of Westlake Corporation⁸
• Feb 18, 2026Shares withheld for tax 1,209 shares at $98.95 of Westlake Corporation⁹
• Feb 17, 2026Exercised options 4,751 shares of Westlake Corporation⁹
• Feb 21, 2025Shares withheld for tax 3,530 shares at $110.54 of Westlake Corporation¹⁰
• Feb 20, 2025Granted 8,819 shares of Westlake Corporation¹⁰
• Feb 19, 2025Shares withheld for tax 132 shares at $112.76 of Westlake Corporation¹¹
• Feb 19, 2025Shares withheld for tax 50 shares at $112.46 of Westlake Corporation¹¹
• Feb 19, 2025Shares withheld for tax 4,264 shares at $111.46 of Westlake Corporation¹¹
• Feb 18, 2025Exercised options 13,987 shares of Westlake Corporation¹¹
• Aug 14, 2024Shares withheld for tax 1,156 shares at $145.44 of Westlake Corporation¹²
• Aug 13, 2024Exercised options 2,938 shares of Westlake Corporation¹²
• May 3, 2024Sold 4,950 shares at $152.19 of Westlake Corporation¹³
• Mar 6, 2024Sold 4,804 shares at $141.02 of Westlake Corporation¹⁴
• Feb 26, 2024Sold 4,854 shares at $137.57 of Westlake Corporation¹⁵
• Feb 20, 2024Shares withheld for tax 547 shares at $138.68 of Westlake Corporation¹⁶
• Feb 20, 2024Shares withheld for tax 5,597 shares at $129.92 of Westlake Corporation¹⁶