Robert F. Buesinger
CIK 1488587 · View on SEC EDGAR ↗
Insider
First SEC filing: Aug. 15, 2024 · Latest: Aug. 15, 2024
On this page
Insider at
Insider transactions
0 buys (P)
1 sells (S)
Net:
$-461,000
+ 84 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
84 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| March 27, 2026 | WLK | S | 4,000 | $115.25 | $461,000 | 34,482 Direct | -10.39% | Disposed | -31.4% (price as of 2026-08-21) |
| May 27, 2025 | WLK | S | 83 | $72.70 | $6,034 | 0 Indirect | -100.00% | Disposed | 8.7% (price as of 2026-08-21) |
| April 22, 2025 | WLK | P | 83 | $93.39 | $7,751 | 83 Indirect | — | Acquired | -15.4% (price as of 2026-08-21) |
| May 9, 2024 | WLK | S | 3,500 | $158.50 | $554,750 | 17,644 Direct | -16.55% | Disposed | -50.1% (price as of 2026-08-21) |
| March 15, 2024 | WLK | S | 3,878 | $144.50 | $560,371 | 21,144 Direct | -15.50% | Disposed | -45.3% (price as of 2026-08-21) |
| March 13, 2024 | WLK | S | 122 | $144.50 | $17,629 | 25,022 Direct | -0.49% | Disposed | -45.3% (price as of 2026-08-21) |
| Nov. 15, 2023 | WLK | S | 4,215 | $130.50 | $550,058 | 16,754 Direct | -20.10% | Disposed | -39.4% (price as of 2026-08-21) |
| May 15, 2018 | WLK | S | 1,447 | $118.88 | $172,019 | 2,642 Direct | -35.39% | Disposed | -33.5% (price as of 2026-08-21) |
| March 5, 2018 | WLK | S | 4,034 | $113.00 | $455,842 | 4,089 Direct | -49.66% | Disposed | -30.1% (price as of 2026-08-21) |
| March 5, 2018 | WLK | S | 15,315 | $113.05 | $1,731,361 | 8,123 Direct | -65.34% | Disposed | -30.1% (price as of 2026-08-21) |
| Dec. 1, 2017 | WLK | S | 2,674 | $98.50 | $263,389 | 6,635 Direct | -28.72% | Disposed | -19.8% (price as of 2026-08-21) |
| Nov. 17, 2017 | WLK | S | 5,214 | $93.82 | $489,177 | 9,309 Direct | -35.90% | Disposed | -15.8% (price as of 2026-08-21) |
| March 1, 2017 | WLK | S | 8,193 | $66.25 | $542,786 | 9,309 Direct | -46.81% | Disposed | 19.3% (price as of 2026-08-21) |
| Nov. 10, 2016 | WLK | S | 2,880 | $54.42 | $156,730 | 8,155 Direct | -26.10% | Disposed | 45.2% (price as of 2026-08-21) |
| May 7, 2014 | WLK | S | 1,872 | $77.36 | $144,818 | 7,672 Direct | -19.61% | Disposed | 2.2% (price as of 2026-08-21) |
| Feb. 26, 2014 | WLK | S | 2,361 | $132.95 | $313,895 | 3,836 Direct | -38.10% | Disposed | 18.9% (price as of 2026-08-21) |
Showing latest 100 of 143 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 |
|---|---|---|---|---|---|---|---|
| Feb. 20, 2026 | WLK | Restricted Stock Units | Common Stock (5,281) | — | — | 5,281 | Acquired |
| Feb. 20, 2026 | WLK | Employee Option (right to buy) | Common Stock (19,351) | $94.48 | Feb. 20, 2036 | 19,351 | Acquired |
| Feb. 17, 2026 | WLK | Restricted Stock Units | Common Stock (3,478) | — | — | 3,478 | Disposed |
| April 11, 2025 | WLK | Restricted Stock Units | Common Stock (17,101) | — | — | 17,101 | Acquired |
| Feb. 21, 2025 | WLK | Restricted Stock Units | Common Stock (4,356) | — | — | 4,356 | Acquired |
| Feb. 21, 2025 | WLK | Employee Option (right to buy) | Common Stock (13,141) | $110.15 | Feb. 21, 2035 | 13,141 | Acquired |
| Feb. 18, 2025 | WLK | Restricted Stock Units | Common Stock (12,923) | — | — | 12,923 | Disposed |
| Aug. 13, 2024 | WLK | Restricted Stock Units | Common Stock (7,051) | — | — | 7,051 | Disposed |
| May 7, 2024 | WLK | Employee Option (right to buy) | Common Stock (3,133) | $122.65 | Feb. 17, 2033 | 3,133 | Disposed |
| March 7, 2024 | WLK | Employee Option (right to buy) | Common Stock (7,665) | $108.12 | Feb. 18, 2032 | 7,665 | Disposed |
| March 7, 2024 | WLK | Employee Option (right to buy) | Common Stock (5,005) | $86.54 | Feb. 19, 2031 | 5,005 | Disposed |
| Feb. 19, 2024 | WLK | Restricted Stock Units | Common Stock (4,283) | — | — | 4,283 | Disposed |
| Feb. 16, 2024 | WLK | Restricted Stock Units | Common Stock (3,073) | — | — | 3,073 | Acquired |
| Feb. 16, 2024 | WLK | Employee Option (right to buy) | Common Stock (8,509) | $144.49 | Feb. 16, 2034 | 8,509 | Acquired |
| Aug. 30, 2023 | WLK | Employee Option (right to buy) | Common Stock (4,857) | $86.54 | Feb. 19, 2031 | 4,857 | Acquired |
| Aug. 29, 2023 | WLK | Employee Option (right to buy) | Common Stock (8,100) | $65.81 | Feb. 14, 2030 | 8,100 | Acquired |
| May 12, 2023 | WLK | Restricted Stock Units | Common Stock (13,164) | — | — | 13,164 | Acquired |
| March 5, 2018 | WLK | Employee Option (right to buy) | Common Stock (4,261) | $61.86 | Feb. 17, 2027 | 4,261 | Disposed |
| March 5, 2018 | WLK | Employee Option (right to buy) | Common Stock (4,446) | $44.42 | Feb. 18, 2026 | 4,446 | Disposed |
| March 5, 2018 | WLK | Employee Option (right to buy) | Common Stock (6,608) | $68.09 | Feb. 20, 2025 | 6,608 | Disposed |
| Feb. 20, 2018 | WLK | Restricted Stock Units | Common Stock (1,982) | — | — | 1,982 | Disposed |
| Feb. 16, 2018 | WLK | Restricted Stock Units | Common Stock (2,569) | — | — | 2,569 | Acquired |
| Feb. 16, 2018 | WLK | Employee Option (right to buy) | Common Stock (9,571) | $107.75 | Feb. 16, 2028 | 9,571 | Acquired |
| Nov. 14, 2017 | WLK | Employee Option (right to buy) | Common Stock (5,214) | $63.98 | Feb. 14, 2024 | 5,214 | Acquired |
| March 1, 2017 | WLK | Employee Option (right to buy) | Common Stock (4,445) | $44.42 | Feb. 18, 2026 | 4,445 | Disposed |
| March 1, 2017 | WLK | Employee Option (right to buy) | Common Stock (3,748) | $45.70 | Feb. 15, 2023 | 3,748 | Disposed |
| Feb. 17, 2017 | WLK | Restricted Stock Units | Common Stock (3,306) | — | — | 3,306 | Acquired |
| Feb. 17, 2017 | WLK | Employee Option (right to buy) | Common Stock (12,913) | $61.86 | Feb. 17, 2027 | 12,913 | Acquired |
| Feb. 14, 2017 | WLK | Restricted Stock Units | Common Stock (1,674) | — | — | 1,674 | Disposed |
| Dec. 1, 2016 | WLK | Restricted Stock Units | Common Stock (4,995) | — | — | 4,995 | Acquired |
| Nov. 10, 2016 | WLK | Employee Option (right to buy) | Common Stock (2,880) | $30.05 | Feb. 17, 2022 | 2,880 | Disposed |
| Feb. 18, 2016 | WLK | Restricted Stock Units | Common Stock (3,539) | — | — | 3,539 | Acquired |
| Feb. 18, 2016 | WLK | Employee Option (right to buy) | Common Stock (13,472) | $44.42 | Feb. 18, 2026 | 13,472 | Acquired |
| Feb. 15, 2016 | WLK | Restricted Stock Units | Common Stock (2,114) | — | — | 2,114 | Disposed |
| Feb. 20, 2015 | WLK | Restricted Stock Units | Common Stock (1,982) | — | — | 1,982 | Acquired |
| Feb. 20, 2015 | WLK | Employee Option (right to buy) | Common Stock (6,608) | $68.09 | Feb. 20, 2025 | 6,608 | Acquired |
| May 7, 2014 | WLK | Employee Option (right to buy) | Common Stock (1,872) | — | Feb. 15, 2023 | 1,872 | Disposed |
| Feb. 26, 2014 | WLK | Employee Option (right to buy) | Common Stock (922) | $45.83 | Feb. 18, 2021 | 922 | Disposed |
| Feb. 26, 2014 | WLK | Employee Option (right to buy) | Common Stock (1,439) | $60.10 | Feb. 17, 2022 | 1,439 | Disposed |
| Feb. 14, 2014 | WLK | Restricted Stock Units | Common Stock (837) | — | — | 837 | Acquired |
| Feb. 14, 2014 | WLK | Employee Option (right to buy) | Common Stock (2,607) | $127.96 | Feb. 14, 2024 | 2,607 | Acquired |
| May 8, 2013 | WLK | Employee Option (right to buy) | Common Stock (1,478) | $27.24 | April 5, 2020 | 1,478 | Disposed |
| March 11, 2013 | WLK | Employee Option (right to buy) | Common Stock (922) | $45.83 | Feb. 18, 2021 | 922 | Disposed |
| March 11, 2013 | WLK | Employee Option (right to buy) | Common Stock (1,439) | $60.10 | Feb. 17, 2022 | 1,439 | Disposed |
| Feb. 15, 2013 | WLK | Restricted Stock Units | Common Stock (1,057) | — | — | 1,057 | Acquired |
| Feb. 15, 2013 | WLK | Employee Option (right to buy) | Common Stock (2,810) | $91.40 | Feb. 15, 2023 | 2,810 | Acquired |
| Dec. 10, 2012 | WLK | Employee Option (right to buy) | Common Stock (922) | $45.83 | Feb. 18, 2021 | 922 | Acquired |
| Aug. 6, 2012 | WLK | Employee Option (right to buy) | Common Stock (1,478) | $27.24 | April 5, 2020 | 1,478 | Acquired |
| Feb. 17, 2012 | WLK | Employee Option (right to buy) | Common Stock (4,318) | $60.10 | Feb. 17, 2022 | 4,318 | Acquired |
| May 19, 2011 | WLK | Employee Option(right to buy) | Common Stock (1,477) | $27.24 | April 5, 2020 | 1,477 | Acquired |
| Feb. 18, 2011 | WLK | Employee Option (right to buy) | Common Stock (2,766) | $45.83 | Feb. 18, 2021 | 2,766 | Acquired |
| April 5, 2010 | WLK | Employee Option (right to buy) | Common Stock (4,433) | $27.24 | April 5, 2020 | 4,433 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).