Insider at

04

Insider transactions

05
0 buys (P) 0 sells (S) Net: $0 + 81 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

81 other filings hidden
DateTickerCodeSharesPriceValue Owned afterΔ ownA/Dvs now
Feb. 25, 2021 WLK S 28,547 $86.93 $2,481,591 9,805 Direct -74.43% Disposed -27.0% (price as of 2026-10-02)
Feb. 25, 2021 WLK S 4,902 $87.14 $427,160 4,903 Direct -49.99% Disposed -27.1% (price as of 2026-10-02)
March 11, 2020 WLKP P 2,500 $16.80 $42,000 12,800 Direct +24.27% Acquired 26.6% (price as of 2026-10-02)
March 10, 2020 WLKP P 2,500 $18.11 $45,275 10,300 Direct +32.05% Acquired 17.4% (price as of 2026-10-02)
March 2, 2018 WLKP P 1,900 $22.75 $43,225 7,800 Direct +32.20% Acquired -6.5% (price as of 2026-10-02)
March 1, 2018 WLKP P 3,100 $22.75 $70,525 5,900 Direct +110.71% Acquired -6.5% (price as of 2026-10-02)
Feb. 26, 2018 WLK S 9,351 $111.86 $1,046,003 2,122 Direct -81.50% Disposed -43.2% (price as of 2026-10-02)
Nov. 13, 2017 WLK S 800 $93.99 $75,192 804 Direct -49.88% Disposed -32.4% (price as of 2026-10-02)
Nov. 13, 2017 WLK S 11,912 $93.99 $1,119,609 1,604 Direct -88.13% Disposed -32.4% (price as of 2026-10-02)
Aug. 7, 2017 WLKP P 300 $25.15 $7,545 2,800 Direct +12.00% Acquired -15.4% (price as of 2026-10-02)
May 11, 2015 WLK S 541 $70.23 $37,994 353 Direct -60.51% Disposed -9.6% (price as of 2026-10-02)
May 11, 2015 WLK S 1,584 $70.25 $111,276 894 Direct -63.92% Disposed -9.6% (price as of 2026-10-02)
Aug. 4, 2014 WLKP P 2,500 $24.00 $60,000 2,500 Direct · Acquired -11.4% (price as of 2026-10-02)
Feb. 28, 2014 WLK S 1,107 $134.70 $149,113 618 Direct -64.17% Disposed -5.7% (price as of 2026-10-02)
March 12, 2013 WLK S 200 $94.71 $18,942 2,440 Direct -7.58% Disposed 34.1% (price as of 2026-10-02)
March 12, 2013 WLK S 800 $94.71 $75,768 1,640 Direct -32.79% Disposed 34.1% (price as of 2026-10-02)
March 12, 2013 WLK S 315 $94.72 $29,837 1,325 Direct -19.21% Disposed 34.1% (price as of 2026-10-02)
March 12, 2013 WLK S 100 $94.76 $9,476 1,225 Direct -7.55% Disposed 34.0% (price as of 2026-10-02)
March 12, 2013 WLK S 421 $94.52 $39,793 804 Direct -34.37% Disposed 34.4% (price as of 2026-10-02)

Showing latest 100 of 108 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.

06
DateTickerSecurityUnderlying Exercise priceExpirationSharesA/D
Feb. 16, 2021 WLK Restricted Stock Units Common Stock (2,295) · · 2,295 Disposed
Feb. 14, 2021 WLK Restricted Stock Units Common Stock (1,112) · · 1,112 Disposed
Feb. 25, 2020 WLK Employee Option (right to buy) Common Stock (4,060) $44.42 Feb. 18, 2026 4,060 Disposed
Feb. 25, 2020 WLK Employee Option (right to buy) Common Stock (7,861) $65.81 Feb. 14, 2030 7,861 Disposed
Feb. 25, 2020 WLK Employee Option (right to buy) Common Stock (9,698) $79.83 Feb. 15, 2029 9,698 Disposed
Feb. 25, 2020 WLK Employee Option (right to buy) Common Stock (6,928) $61.86 Feb. 17, 2027 6,928 Disposed
Feb. 17, 2020 WLK Restricted Stock Units Common Stock (2,647) · · 2,647 Disposed
Feb. 14, 2020 WLK Employee Option (right to buy) Common Stock (23,822) $65.81 Feb. 14, 2030 23,822 Acquired
Feb. 14, 2020 WLK Restricted Stock Units Common Stock (5,632) · · 5,632 Acquired
Feb. 14, 2020 WLK Restricted Stock Units Common Stock (1,112) · · 1,112 Acquired
Dec. 1, 2019 WLK Restricted Stock Units Common Stock (1,665) · · 1,665 Disposed
Feb. 18, 2019 WLK Restricted Stock Units Common Stock (3,137) · · 3,137 Disposed
Feb. 15, 2019 WLK Employee Option (right to buy) Common Stock (14,694) $79.83 Feb. 15, 2029 14,694 Acquired
Feb. 15, 2019 WLK Restricted Stock Units Common Stock (3,869) · · 3,869 Acquired
Feb. 26, 2018 WLK Employee Option (right to buy) Common Stock (3,941) $44.42 Feb. 18, 2026 3,941 Disposed
Feb. 26, 2018 WLK Employee Option (right to buy) Common Stock (3,412) $61.86 Feb. 17, 2027 3,412 Disposed
Feb. 26, 2018 WLK Employee Option (right to buy) Common Stock (1,998) $68.09 Feb. 20, 2025 1,998 Disposed
Feb. 20, 2018 WLK Restricted Stock Units Common Stock (1,762) · · 1,762 Disposed
Feb. 16, 2018 WLK Restricted Stock Units Common Stock (2,295) · · 2,295 Acquired
Feb. 16, 2018 WLK Employee Option (right to buy) Common Stock (8,550) $107.75 Feb. 16, 2028 8,550 Acquired
Nov. 13, 2017 WLK Employee Option (right to buy) Common Stock (3,408) $63.98 Feb. 14, 2024 3,408 Disposed
Nov. 13, 2017 WLK Employee Option (right to buy) Common Stock (3,878) $68.09 Feb. 20, 2025 3,878 Disposed
Nov. 13, 2017 WLK Employee Option (right to buy) Common Stock (3,940) $44.42 Feb. 18, 2026 3,940 Disposed
Nov. 13, 2017 WLK Employee Option (right to buy) Common Stock (686) $45.70 Feb. 15, 2023 686 Disposed
Feb. 17, 2017 WLK Restricted Stock Units Common Stock (2,647) · · 2,647 Acquired
Feb. 17, 2017 WLK Employee Option (right to buy) Common Stock (10,340) $61.86 Feb. 17, 2027 10,340 Acquired
Feb. 14, 2017 WLK Restricted Stock Units Common Stock (1,094) · · 1,094 Disposed
Dec. 1, 2016 WLK Restricted Stock Units Common Stock (1,665) · · 1,665 Acquired
Feb. 18, 2016 WLK Restricted Stock Units Common Stock (3,137) · · 3,137 Acquired
Feb. 18, 2016 WLK Employee Option (right to buy) Common Stock (11,941) $44.42 Feb. 18, 2026 11,941 Acquired
Feb. 15, 2016 WLK Restricted Stock Units Common Stock (774) · · 774 Disposed
May 11, 2015 WLK Employee Option (right to buy) Common Stock (898) $30.05 Feb. 17, 2022 898 Disposed
May 11, 2015 WLK Employee Option (right to buy) Common Stock (686) $45.70 Feb. 15, 2023 686 Disposed
Feb. 20, 2015 WLK Restricted Stock units Common Stock (1,762) · · 1,762 Acquired
Feb. 20, 2015 WLK Employee Option (right to buy) Common Stock (5,876) $68.09 Feb. 20, 2025 5,876 Acquired
Feb. 28, 2014 WLK Employee Option (right to buy) Common Stock (449) $60.10 Feb. 17, 2022 449 Disposed
Feb. 28, 2014 WLK Employee Option (right to buy) Common Stock (342) $91.40 Feb. 15, 2023 342 Disposed
Feb. 28, 2014 WLK Employee Option (right to buy) Common Stock (223) $45.83 Feb. 18, 2021 223 Disposed
Feb. 14, 2014 WLK Restricted Stock Units Common Stock (547) · · 547 Acquired
Feb. 14, 2014 WLK Employee Option (right to buy) Common Stock (1,704) $127.96 Feb. 24, 2024 1,704 Acquired
March 12, 2013 WLK Employee Option (right to buy) Common Stock (520) $20.52 Feb. 26, 2020 520 Disposed
March 12, 2013 WLK Employee Option (right to buy) Common Stock (449) $60.10 Feb. 17, 2022 449 Disposed
March 12, 2013 WLK Employee Option (right to buy) Common Stock (446) $45.83 Feb. 18, 2021 446 Disposed
Feb. 15, 2013 WLK Restricted Stock Units Common Stock (387) · · 387 Acquired
Feb. 15, 2013 WLK Employee Option (right to buy) Common Stock (1,028) $91.40 Feb. 15, 2023 1,028 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 6 holdings

07

Securities held when first becoming an insider, per SEC Form 3.

DateTickerSecuritySharesOwnership
June 8, 2012 WLK Employee Option (right to buy)→ Common Stock (520) 520 Direct
June 8, 2012 WLK Employee Option (right to buy)→ Common Stock (669) 669 Direct
June 8, 2012 WLK Employee Option (right to buy)→ Common Stock (1,347) 1,347 Direct
June 8, 2012 WLK Employee Option (right to buy)→ Common Stock (520) 520 Direct
June 8, 2012 WLK Employee Option (right to buy)→ Common Stock (669) 669 Direct
June 8, 2012 WLK Employee Option (right to buy)→ Common Stock (1,347) 1,347 Direct