Mark Steven Bender

CIK 1330417 · View on SEC EDGAR ↗

Insider

First SEC filing: Aug. 15, 2024 · Latest: Aug. 15, 2024

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Insider at

Insider transactions

0 buys (P) 3 sells (S) Net: $-3,604,118 + 78 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

78 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
March 27, 2026 WLK S 16,413 $112.54 $1,847,119 28,015 Direct -36.94% Disposed -29.0% (price as of 2026-08-19)
Feb. 27, 2026 WLK S 421 $101.52 $42,740 44,433 Direct -0.94% Disposed -21.3% (price as of 2026-08-19)
Feb. 27, 2026 WLK S 16,988 $100.91 $1,714,259 44,854 Direct -27.47% Disposed -20.8% (price as of 2026-08-19)
May 3, 2024 WLK S 4,950 $152.19 $753,340 40,356 Direct -10.93% Disposed -47.5% (price as of 2026-08-19)
March 6, 2024 WLK S 4,804 $141.02 $677,460 45,306 Direct -9.59% Disposed -43.4% (price as of 2026-08-19)
Feb. 26, 2024 WLK S 4,854 $137.57 $667,765 50,110 Direct -8.83% Disposed -41.9% (price as of 2026-08-19)
May 21, 2018 WLK S 261 $123.59 $32,257 15,810 Direct -1.62% Disposed -35.4% (price as of 2026-08-19)
May 21, 2018 WLK S 9,505 $123.04 $1,169,495 16,071 Direct -37.16% Disposed -35.1% (price as of 2026-08-19)
May 21, 2018 WLK S 2,300 $121.90 $280,370 25,576 Direct -8.25% Disposed -34.5% (price as of 2026-08-19)
May 11, 2018 WLK S 23,506 $117.33 $2,757,959 15,810 Direct -59.79% Disposed -31.9% (price as of 2026-08-19)
Feb. 27, 2018 WLKP P 2,000 $23.77 $47,540 12,000 Direct +20.00% Acquired -7.9% (price as of 2026-08-19)
Feb. 26, 2018 WLK S 3,500 $112.06 $392,210 15,810 Direct -18.13% Disposed -28.7% (price as of 2026-08-19)
Feb. 26, 2018 WLK S 1,500 $110.84 $166,260 19,310 Direct -7.21% Disposed -27.9% (price as of 2026-08-19)
Feb. 22, 2018 WLK S 2,000 $110.64 $221,280 20,810 Direct -8.77% Disposed -27.8% (price as of 2026-08-19)
Feb. 22, 2018 WLK S 4,000 $110.97 $443,880 22,810 Direct -14.92% Disposed -28.0% (price as of 2026-08-19)
Dec. 4, 2017 WLK S 6,500 $97.83 $635,895 24,067 Direct -21.26% Disposed -18.3% (price as of 2026-08-19)
Nov. 21, 2017 WLK S 20,382 $94.26 $1,921,207 24,067 Direct -45.85% Disposed -15.3% (price as of 2026-08-19)
Nov. 13, 2017 WLK S 600 $94.60 $56,760 44,449 Direct -1.33% Disposed -15.6% (price as of 2026-08-19)
Nov. 13, 2017 WLK S 29,204 $94.00 $2,745,176 45,049 Direct -39.33% Disposed -15.0% (price as of 2026-08-19)
Aug. 15, 2017 WLK S 13,794 $70.22 $968,615 44,449 Direct -23.68% Disposed 13.8% (price as of 2026-08-19)
March 10, 2017 WLK S 12,000 $64.32 $771,840 58,243 Direct -17.08% Disposed 24.2% (price as of 2026-08-19)
Nov. 26, 2012 WLK S 4,407 $75.00 $330,525 36,281 Direct -10.83% Disposed 113.0% (price as of 2026-08-19)

Showing latest 100 of 227 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.

Date Ticker Security Underlying Exercise price Expiration Shares A/D
May 12, 2026 WLK Restricted Stock Units Common Stock (13,164) — — 13,164 Disposed
Feb. 27, 2026 WLK Employee Option (right to buy) Common Stock (6,494) $86.54 Feb. 19, 2031 6,494 Disposed
Feb. 27, 2026 WLK Employee Option (right to buy) Common Stock (6,199) $65.81 Feb. 14, 2030 6,199 Disposed
Feb. 20, 2026 WLK Restricted Stock Units Common Stock (7,747) — — 7,747 Acquired
Feb. 20, 2026 WLK Employee Option (right to buy) Common Stock (28,389) $94.48 Feb. 20, 2036 28,389 Acquired
Feb. 17, 2026 WLK Restricted Stock Units Common Stock (4,751) — — 4,751 Disposed
Feb. 21, 2025 WLK Restricted Stock Units Common Stock (6,391) — — 6,391 Acquired
Feb. 21, 2025 WLK Employee Option (right to buy) Common Stock (19,279) $110.15 Feb. 21, 2035 19,279 Acquired
Feb. 18, 2025 WLK Restricted Stock Units Common Stock (13,987) — — 13,987 Disposed
Aug. 13, 2024 WLK Restricted Stock Units Common Stock (2,938) — — 2,938 Disposed
Feb. 19, 2024 WLK Restricted Stock Units Common Stock (5,558) — — 5,558 Disposed
Feb. 16, 2024 WLK Restricted Stock Units Common Stock (4,459) — — 4,459 Acquired
Feb. 16, 2024 WLK Employee Option (right to buy) Common Stock (12,344) $144.49 Feb. 16, 2034 12,344 Acquired
Aug. 7, 2023 WLK Employee Option (right to buy) Common Sotck (12,606) $86.54 Feb. 19, 2031 12,606 Acquired
Aug. 7, 2023 WLK Employee Option (right to buy) Common Stock (12,033) $107.75 Feb. 16, 2028 12,033 Acquired
May 12, 2023 WLK Restricted Stock Units Common Stock (13,164) — — 13,164 Acquired
May 8, 2023 WLK Employee Option (right to buy) Common Stock (1,084) $65.81 Feb. 14, 2030 1,084 Acquired
May 21, 2018 WLK Employee Option (right to buy) Common Stock (12,066) $68.09 Feb. 20, 2025 12,066 Disposed
May 11, 2018 WLK Employee Option (right to buy) Common Stock (6,680) $22.92 Feb. 18, 2021 6,680 Disposed
May 11, 2018 WLK Employee Option (right to buy) Common Stock (16,826) $30.05 Feb. 17, 2022 16,826 Disposed
Feb. 20, 2018 WLK Restricted Stock Units Common Stock (3,619) — — 3,619 Disposed
Feb. 16, 2018 WLK Restricted Stock Units Common Stock (3,230) — — 3,230 Acquired
Feb. 16, 2018 WLK Employee Option (right to buy) Common Stock (12,033) $107.75 Feb. 16, 2028 12,033 Acquired
Dec. 4, 2017 WLK Employee Option (right to buy) Common Stock (6,500) $22.92 Feb. 18, 2021 6,500 Acquired
Nov. 26, 2017 WLK Employee Option (right to buy) Common Stock — Feb. 13, 2019 4,407 Acquired
Nov. 13, 2017 WLK Employee Option (right to buy) Common Stock (29,804) $10.26 Feb. 26, 2020 29,804 Disposed
Feb. 17, 2017 WLK Restricted Stock Units Common Stock (5,375) — — 5,375 Acquired
Feb. 17, 2017 WLK Employee Option (right to buy) Common Stock (20,995) $61.86 Feb. 17, 2027 20,995 Acquired
Feb. 14, 2017 WLK Restricted Stock Units Common Stock (3,152) — — 3,152 Disposed
Dec. 1, 2016 WLK Restricted Stock Units Common Stock (8,324) — — 8,324 Acquired
Aug. 23, 2016 WLK Employee Option (right to buy) Common Stock (30,714) $15.80 Feb. 23, 2017 30,714 Disposed
Feb. 18, 2016 WLK Restricted Stock Units Common Stock (6,566) — — 6,566 Acquired
Feb. 18, 2016 WLK Employee Option (right to buy) Common Stock (24,996) $44.42 Feb. 18, 2026 24,996 Acquired
Feb. 15, 2016 WLK Restricted Stock Units Common Stock (4,040) — — 4,040 Disposed
Feb. 20, 2015 WLK Restricted Stock Units Common Stock (3,619) — — 3,619 Acquired
Feb. 20, 2015 WLK Employee Option (right to buy) Common Stock (12,066) $68.09 Feb. 20, 2025 12,066 Acquired
March 3, 2014 WLK Employee Option (right to buy) Common Stock (15,357) $31.61 Feb. 23, 2017 15,357 Disposed
March 3, 2014 WLK Employee Option (right to buy) Common Stock (2,364) $31.61 Feb. 23, 2017 2,364 Disposed
Feb. 14, 2014 WLK Restricted Stock Units Common Stock (1,576) — — 1,576 Acquired
Feb. 14, 2014 WLK Employee Option (right to buy) Common Stock (4,908) $127.96 Feb. 14, 2024 4,908 Acquired
March 25, 2013 WLK Employee Option (right to buy) Common Stock (3,272) $25.42 June 15, 2015 3,272 Disposed
March 25, 2013 WLK Employee Option (right to buy) Common Stock (922) $36.10 March 15, 2016 922 Disposed
March 25, 2013 WLK Employee Option (right to buy) Common Stock (235) $27.22 Aug. 31, 2015 235 Disposed
Feb. 15, 2013 WLK Restricted Stock Units Common Stock (2,020) — — 2,020 Acquired
Feb. 15, 2013 WLK Employee Option (right to buy) Common Stock (5,370) $91.40 Feb. 15, 2023 5,370 Acquired
Nov. 26, 2012 WLK Employee Option (right to buy) Common Stock (4,407) $14.24 Feb. 13, 2019 4,407 Acquired
Nov. 23, 2012 WLK Employee Option (right to buy) Common Stock (1,220) $14.24 Feb. 13, 2019 1,220 Acquired
Feb. 17, 2012 WLK Employee Option (right to buy) Common Stock (8,413) $60.10 Feb. 17, 2022 8,413 Acquired
Feb. 25, 2011 WLK Employee Option (right to buy) Common Stock (7,767) $19.29 Feb. 15, 2018 7,767 Disposed
Feb. 25, 2011 WLK Employee Option (right to buy) Common Stock (20,066) $14.24 Feb. 13, 2019 20,066 Disposed
Feb. 25, 2011 WLK Employee Option (right to buy) Common Stock (7,767) $19.29 Feb. 15, 2018 7,767 Disposed
Feb. 25, 2011 WLK Employee Option (right to buy) Common Stock (20,066) $14.24 Feb. 13, 2019 20,066 Disposed
Feb. 26, 2010 WLK Employee Option (right to buy) Common Stock (14,902) $20.52 Feb. 26, 2020 14,902 Acquired
Feb. 13, 2009 WLK Employee Option (right to buy) Common Stock (30,100) $14.24 Feb. 13, 2019 30,100 Acquired
Feb. 19, 2008 WLK Employee Option (right to buy) Common Stock (7,767) $19.29 Feb. 15, 2018 7,767 Acquired
Feb. 19, 2008 WLK Employee Option (right to buy) Common Stock (7,767) $19.29 Feb. 15, 2018 7,767 Acquired
March 2, 2007 WLK Employee Option (right to buy) Common Stock (30,714) $31.61 Feb. 23, 2017 30,714 Acquired
March 2, 2007 WLK Employee Option (right to buy) Common Stock (2,364) $31.61 Feb. 23, 2017 2,364 Acquired
March 20, 2006 WLK Employee Option (right to buy) Common Stock (922) $36.10 March 15, 2016 922 Acquired
Oct. 6, 2005 WLK Employee Option (right to buy) Common Stock (3,272) $25.42 June 15, 2015 3,272 Acquired
Sept. 9, 2005 WLK Employee Option (right to buy) Common Stock (235) $27.22 Aug. 31, 2015 235 Acquired

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

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

WLK

Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2013 $444,333 — $184,600 $184,600 $1,019,862 — $39,861 $1,873,257
2012 $423,333 — — — $883,206 — $110,855 $1,810,994
2011 $405,000 — — — $487,789 — $35,481 $1,181,604

WLKP

CFO
Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2023 $721,000 — — — — — — $72,100

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.