SEC CIK 1488587
Buesinger Robert F.
Reported ownership across 1 company, sourced from SEC Form 4 filings and updated daily.
Current Positions
| Company | Shares Owned | As Of |
|---|---|---|
| WLKview stock → | 34,482 | 2026-03-27 |
Position History — WLK
Reported shares owned immediately after each Form 4 transaction, over time.
Recent Filings — WLK
| Date | Activity | Shares | Price | Owned After |
|---|---|---|---|---|
| 2026-03-27 | Open-market sale | 4,000 | $115.25 | 34,482 |
| 2026-02-20 | Grant / award (derivative) | 5,281 | $0.00 | 5,281 |
| 2026-02-20 | Grant / award (derivative) | 19,351 | $0.00 | 19,351 |
| 2026-02-20 | Tax withholding | 326 | $94.10 | 38,482 |
| 2026-02-19 | Grant / award | 1,301 | $0.00 | 38,808 |
| 2026-02-18 | Tax withholding | 903 | $98.95 | 37,507 |
| 2026-02-17 | Option exercise (derivative) | 3,478 | $0.00 | 0 |
| 2026-02-17 | Option exercise | 3,478 | $0.00 | 38,410 |
| 2025-05-27 | Open-market sale | 83 | $72.70 | 0 |
| 2025-04-22 | Open-market buy | 83 | $93.39 | 83 |
| 2025-04-11 | Grant / award (derivative) | 17,101 | $0.00 | 17,101 |
| 2025-02-21 | Grant / award (derivative) | 13,141 | $0.00 | 13,141 |
| 2025-02-21 | Grant / award (derivative) | 4,356 | $0.00 | 4,356 |
| 2025-02-21 | Tax withholding | 2,738 | $110.54 | 34,932 |
| 2025-02-20 | Grant / award | 6,839 | $0.00 | 37,670 |
| 2025-02-19 | Tax withholding | 3,851 | $111.46 | 30,995 |
| 2025-02-19 | Tax withholding | 164 | $112.76 | 30,831 |
| 2025-02-18 | Option exercise (derivative) | 12,923 | $0.00 | 0 |
| 2025-02-18 | Option exercise | 12,923 | $0.00 | 34,846 |
| 2024-08-14 | Tax withholding | 2,772 | $145.44 | 21,923 |
| 2024-08-13 | Option exercise (derivative) | 7,051 | $0.00 | 0 |
| 2024-08-13 | Option exercise | 7,051 | $0.00 | 24,695 |
| 2024-05-09 | Open-market sale | 3,500 | $158.50 | 17,644 |
| 2024-05-07 | Option exercise (derivative) | 3,133 | $0.00 | 6,362 |
| 2024-05-07 | Disposition to issuer | 3,133 | $157.50 | 21,144 |
| 2024-05-07 | Option exercise | 3,133 | $122.65 | 24,277 |
| 2024-03-15 | Open-market sale | 3,878 | $144.50 | 21,144 |
| 2024-03-13 | Open-market sale | 122 | $144.50 | 25,022 |
| 2024-03-07 | Option exercise (derivative) | 7,665 | $0.00 | 3,950 |
| 2024-03-07 | Option exercise (derivative) | 5,005 | $0.00 | 0 |
| 2024-03-07 | Option exercise | 5,005 | $86.54 | 30,149 |
| 2024-03-07 | Option exercise | 7,665 | $108.12 | 37,814 |
| 2024-03-07 | Disposition to issuer | 12,670 | $142.55 | 25,144 |
| 2024-02-20 | Tax withholding | 4,083 | $129.92 | 25,546 |
| 2024-02-20 | Tax withholding | 3 | $135.32 | 25,543 |
| 2024-02-20 | Tax withholding | 399 | $137.38 | 25,144 |
| 2024-02-19 | Option exercise (derivative) | 4,283 | $0.00 | 0 |
| 2024-02-19 | Option exercise | 4,283 | $0.00 | 29,629 |
| 2024-02-16 | Grant / award (derivative) | 3,073 | $0.00 | 3,073 |
| 2024-02-16 | Grant / award (derivative) | 8,509 | $0.00 | 8,509 |
| 2024-02-16 | Grant / award | 8,592 | $0.00 | 25,346 |
| 2023-11-15 | Open-market sale | 4,215 | $130.50 | 16,754 |
| 2023-08-30 | Option exercise (derivative) | 4,857 | $0.00 | 0 |
| 2023-08-30 | Disposition to issuer | 4,857 | $134.47 | 20,969 |
| 2023-08-30 | Option exercise | 4,857 | $86.54 | 25,826 |
| 2023-08-29 | Option exercise (derivative) | 8,100 | $0.00 | 0 |
| 2023-08-29 | Disposition to issuer | 8,100 | $133.83 | 20,969 |
| 2023-08-29 | Option exercise | 8,100 | $65.81 | 29,069 |
| 2023-05-12 | Grant / award (derivative) | 13,164 | $0.00 | 13,164 |
| 2023-03-13 | Tax withholding | 240 | $105.27 | 20,969 |
| 2023-03-13 | Tax withholding | 4,512 | $104.32 | 21,209 |
| 2023-02-17 | Grant / award | 11,298 | $0.00 | 25,721 |
| 2023-02-17 | Grant / award | 11,298 | $0.00 | 25,721 |
| 2023-02-17 | Grant / award (derivative) | 9,495 | $0.00 | 9,495 |
| 2023-02-17 | Grant / award (derivative) | 3,478 | $0.00 | 3,478 |
| 2023-02-15 | Tax withholding | 1,397 | $121.86 | 14,443 |
| 2023-02-15 | Tax withholding | 20 | $122.41 | 14,423 |
| 2023-02-14 | Option exercise (derivative) | 5,632 | $0.00 | 0 |
| 2023-02-14 | Option exercise | 5,632 | — | 15,840 |
| 2022-08-31 | Open-market sale | 1,000 | $98.94 | 10,208 |
| 2022-08-23 | Gift | 572 | $0.00 | 11,208 |
| 2022-05-27 | Option exercise (derivative) | 4,856 | $0.00 | 9,862 |
| 2022-05-27 | Option exercise (derivative) | 9,571 | $0.00 | 0 |
| 2022-05-27 | Option exercise | 9,571 | $107.75 | 21,351 |
| 2022-05-27 | Open-market sale | 14,427 | $129.47 | 11,780 |
| 2022-05-27 | Option exercise | 4,856 | $86.54 | 26,207 |
| 2022-03-15 | Gift | 500 | $0.00 | 11,780 |
| 2022-03-14 | Tax withholding | 3 | $120.25 | 12,280 |
| 2022-03-14 | Tax withholding | 2,556 | $118.51 | 12,283 |
| 2022-03-10 | Option exercise (derivative) | 7,861 | $0.00 | 8,100 |
| 2022-03-10 | Option exercise (derivative) | 14,694 | $0.00 | 0 |
| 2022-03-10 | Open-market sale | 22,555 | $117.61 | 14,839 |
| 2022-03-10 | Option exercise | 14,694 | $79.83 | 29,533 |
| 2022-03-10 | Option exercise | 7,861 | $65.81 | 37,394 |
| 2022-03-09 | Open-market sale | 2,730 | $115.55 | 14,839 |
| 2022-02-18 | Grant / award | 6,446 | $0.00 | 17,569 |
| 2022-02-18 | Grant / award | 6,446 | $0.00 | 17,569 |
| 2022-02-18 | Grant / award (derivative) | 11,615 | $0.00 | 11,615 |
| 2022-02-18 | Grant / award (derivative) | 12,923 | $0.00 | 12,923 |
| 2022-02-16 | Tax withholding | 963 | $104.96 | 11,123 |
| 2022-02-15 | Option exercise (derivative) | 3,869 | $0.00 | 0 |
| 2022-02-15 | Option exercise | 3,869 | — | 12,086 |
| 2021-08-13 | Grant / award (derivative) | 7,051 | $0.00 | 7,051 |
| 2021-05-10 | Open-market sale | 5,000 | $105.00 | 8,217 |
| 2021-03-18 | Gift | 82 | $0.00 | 13,217 |
| 2021-03-08 | Option exercise (derivative) | 8,652 | $0.00 | 0 |
| 2021-03-08 | Option exercise (derivative) | 7,861 | $0.00 | 15,961 |
| 2021-03-08 | Option exercise | 8,652 | $61.87 | 21,951 |
| 2021-03-08 | Open-market sale | 7,861 | $95.00 | 13,299 |
| 2021-03-08 | Open-market sale | 8,652 | $92.50 | 21,160 |
| 2021-03-08 | Option exercise | 7,861 | $65.81 | 29,812 |
| 2021-02-19 | Grant / award (derivative) | 14,718 | $0.00 | 14,718 |
| 2021-02-19 | Grant / award (derivative) | 4,283 | $0.00 | 4,283 |
| 2021-02-18 | Tax withholding | 641 | $85.08 | 13,299 |
| 2021-02-16 | Tax withholding | 322 | $85.73 | 11,375 |
| 2021-02-16 | Tax withholding | 4 | $87.43 | 11,371 |
| 2021-02-16 | Tax withholding | 4 | $87.43 | 11,371 |
| 2021-02-16 | Tax withholding | 322 | $85.73 | 11,375 |
| 2021-02-16 | Option exercise (derivative) | 2,569 | $0.00 | 0 |
| 2021-02-16 | Option exercise | 2,569 | — | 13,940 |
| 2021-02-14 | Option exercise (derivative) | 1,128 | $0.00 | 0 |
| 2021-02-14 | Option exercise | 1,128 | — | 11,697 |
| 2021-02-14 | Option exercise (derivative) | 1,128 | $0.00 | 0 |
| 2021-02-14 | Option exercise | 1,128 | — | 11,697 |
| 2020-11-24 | Option exercise (derivative) | 4,581 | $0.00 | 0 |
| 2020-11-24 | Option exercise | 4,581 | $44.42 | 15,150 |
| 2020-11-24 | Open-market sale | 4,581 | $77.50 | 10,569 |
| 2020-02-18 | Tax withholding | 918 | $60.52 | 10,569 |
| 2020-02-17 | Option exercise (derivative) | 3,306 | $0.00 | 0 |
| 2020-02-17 | Option exercise | 3,306 | — | 11,487 |
| 2020-02-14 | Grant / award (derivative) | 5,632 | $0.00 | 5,632 |
| 2020-02-14 | Grant / award (derivative) | 23,822 | $0.00 | 23,822 |
| 2020-02-14 | Grant / award (derivative) | 1,128 | $0.00 | 1,128 |
| 2019-12-03 | Tax withholding | 2,025 | $67.01 | 8,181 |
| 2019-12-01 | Option exercise (derivative) | 4,995 | $0.00 | 0 |
| 2019-12-01 | Option exercise | 4,995 | — | 10,206 |
| 2019-02-19 | Tax withholding | 85 | $75.53 | 5,211 |
| 2019-02-19 | Tax withholding | 885 | $73.29 | 5,296 |
| 2019-02-18 | Option exercise (derivative) | 3,539 | $0.00 | 0 |
| 2019-02-18 | Option exercise | 3,539 | — | 6,181 |
| 2019-02-15 | Grant / award (derivative) | 3,869 | $0.00 | 3,869 |
| 2019-02-15 | Grant / award (derivative) | 14,694 | $0.00 | 14,694 |
| 2018-05-15 | Open-market sale | 1,447 | $118.88 | 2,642 |
| 2018-03-05 | Option exercise (derivative) | 6,608 | $0.00 | 0 |
| 2018-03-05 | Option exercise (derivative) | 4,446 | $0.00 | 4,581 |
| 2018-03-05 | Option exercise (derivative) | 4,261 | $0.00 | 8,652 |
| 2018-03-05 | Option exercise | 6,608 | $68.09 | 14,731 |
| 2018-03-05 | Option exercise | 4,446 | $44.42 | 19,177 |
| 2018-03-05 | Option exercise | 4,261 | $61.87 | 23,438 |
| 2018-03-05 | Open-market sale | 15,315 | $113.05 | 8,123 |
| 2018-03-05 | Open-market sale | 4,034 | $113.00 | 4,089 |
| 2018-02-21 | Tax withholding | 494 | $106.98 | 8,123 |
| 2018-02-20 | Option exercise (derivative) | 1,982 | $0.00 | 0 |
| 2018-02-20 | Option exercise | 1,982 | — | 8,617 |
| 2018-02-16 | Grant / award (derivative) | 2,569 | $0.00 | 2,569 |
| 2018-02-16 | Grant / award (derivative) | 9,571 | $0.00 | 9,571 |
| 2017-12-01 | Open-market sale | 2,674 | $98.50 | 6,635 |
| 2017-11-17 | Option exercise | 5,214 | $63.98 | 14,523 |
| 2017-11-17 | Open-market sale | 5,214 | $93.82 | 9,309 |
| 2017-11-14 | Option exercise (derivative) | 5,214 | $0.00 | 0 |
| 2017-03-01 | Option exercise (derivative) | 4,445 | $0.00 | 45 |
| 2017-03-01 | Option exercise (derivative) | 3,748 | $0.00 | 0 |
| 2017-03-01 | Open-market sale | 8,193 | $66.25 | 9,309 |
| 2017-03-01 | Option exercise | 3,748 | $45.70 | 13,057 |
| 2017-03-01 | Option exercise | 4,445 | $44.42 | 17,502 |
| 2017-02-17 | Grant / award (derivative) | 3,306 | $0.00 | 3,306 |
| 2017-02-17 | Grant / award (derivative) | 12,913 | $0.00 | 12,913 |
| 2017-02-15 | Tax withholding | 520 | $64.01 | 9,309 |
| 2017-02-14 | Option exercise (derivative) | 1,674 | $0.00 | 0 |
| 2017-02-14 | Option exercise | 1,674 | — | 9,829 |
| 2016-12-01 | Grant / award (derivative) | 4,995 | $0.00 | 4,995 |
| 2016-11-10 | Option exercise (derivative) | 2,880 | $0.00 | 0 |
| 2016-11-10 | Open-market sale | 2,880 | $54.42 | 8,155 |
| 2016-11-10 | Option exercise | 2,880 | $30.05 | 11,035 |
| 2016-02-18 | Grant / award (derivative) | 3,539 | $0.00 | 3,539 |
| 2016-02-18 | Grant / award (derivative) | 13,472 | $0.00 | 13,472 |
| 2016-02-17 | Tax withholding | 667 | $43.52 | 8,155 |
| 2016-02-15 | Option exercise (derivative) | 2,114 | $0.00 | 0 |
| 2016-02-15 | Option exercise | 2,114 | — | 8,822 |
| 2015-02-20 | Grant / award (derivative) | 1,982 | $0.00 | 1,982 |
| 2015-02-20 | Grant / award (derivative) | 6,608 | $0.00 | 6,608 |
| 2015-02-18 | Tax withholding | 964 | $66.79 | 6,708 |
| 2014-05-07 | Option exercise (derivative) | 1,872 | $0.00 | 3,748 |
| 2014-05-07 | Open-market sale | 1,872 | $77.36 | 7,672 |
| 2014-05-07 | Option exercise | 1,872 | $45.70 | 9,544 |
| 2014-02-26 | Option exercise (derivative) | 922 | $0.00 | 0 |
| 2014-02-26 | Option exercise (derivative) | 1,439 | $0.00 | 1,440 |
| 2014-02-26 | Option exercise | 1,439 | $60.11 | 5,275 |
| 2014-02-26 | Open-market sale | 2,361 | $132.95 | 3,836 |
| 2014-02-26 | Option exercise | 922 | $45.83 | 6,197 |
| 2014-02-19 | Tax withholding | 1 | $129.58 | 4,177 |
| 2014-02-19 | Tax withholding | 341 | $129.00 | 3,836 |
| 2014-02-14 | Grant / award (derivative) | 2,607 | $0.00 | 2,607 |
| 2014-02-14 | Grant / award (derivative) | 837 | $0.00 | 837 |
| 2013-05-08 | Option exercise (derivative) | 1,478 | $0.00 | 0 |
| 2013-05-08 | Option exercise | 1,478 | $27.24 | 5,656 |
| 2013-05-08 | Open-market sale | 1,478 | $90.97 | 4,178 |
| 2013-04-08 | Tax withholding | 167 | $85.92 | 4,178 |
| 2013-03-11 | Option exercise (derivative) | 1,439 | $0.00 | 2,879 |
| 2013-03-11 | Option exercise (derivative) | 922 | $0.00 | 922 |
| 2013-03-11 | Option exercise | 922 | $45.83 | 6,706 |
| 2013-03-11 | Option exercise | 1,439 | $60.11 | 5,784 |
| 2013-03-11 | Open-market sale | 600 | $93.76 | 6,106 |
| 2013-03-11 | Open-market sale | 100 | $93.77 | 6,006 |
| 2013-03-11 | Open-market sale | 100 | $93.78 | 5,906 |
| 2013-03-11 | Open-market sale | 100 | $93.82 | 4,345 |
| 2013-03-11 | Open-market sale | 100 | $93.82 | 4,445 |
| 2013-03-11 | Open-market sale | 100 | $93.81 | 4,545 |
| 2013-03-11 | Open-market sale | 200 | $93.81 | 4,645 |
| 2013-03-11 | Open-market sale | 600 | $93.80 | 4,845 |
| 2013-03-11 | Open-market sale | 461 | $93.79 | 5,445 |
| 2013-02-15 | Grant / award (derivative) | 1,057 | $0.00 | 1,057 |
| 2013-02-15 | Grant / award (derivative) | 2,810 | $0.00 | 2,810 |
| 2012-12-10 | Option exercise (derivative) | 922 | $0.00 | 1,844 |
| 2012-12-10 | Open-market sale | 922 | $75.68 | 4,345 |
| 2012-12-10 | Option exercise | 922 | $45.83 | 5,267 |
| 2012-08-06 | Option exercise (derivative) | 1,478 | $0.00 | 1,478 |
| 2012-08-06 | Open-market sale | 400 | $67.16 | 5,423 |
| 2012-08-06 | Open-market sale | 1,078 | $67.16 | 4,345 |
| 2012-08-06 | Option exercise | 1,478 | $27.24 | 5,823 |
| 2012-04-09 | Tax withholding | 4 | $60.82 | 4,345 |
| 2012-04-09 | Tax withholding | 166 | $60.81 | 4,349 |
| 2012-02-17 | Grant / award (derivative) | 4,318 | $0.00 | 4,318 |
| 2012-02-17 | Grant / award | 1,681 | $0.00 | 4,515 |
| 2011-05-19 | Grant / award (derivative) | 1,477 | $0.00 | 2,956 |
| 2011-05-19 | Open-market sale | 100 | $55.43 | 3,981 |
| 2011-05-19 | Option exercise | 1,477 | $27.24 | 4,081 |
| 2011-05-19 | Open-market sale | 600 | $55.40 | 3,281 |
| 2011-05-19 | Open-market sale | 100 | $55.42 | 3,881 |
| 2011-05-19 | Open-market sale | 677 | $55.39 | 2,604 |
| 2011-04-07 | Tax withholding | 162 | $57.44 | 2,604 |
| 2011-04-07 | Tax withholding | 162 | $57.44 | 2,834 |
| 2011-02-18 | Grant / award (derivative) | 2,766 | $0.00 | 2,766 |
| 2011-02-18 | Grant / award | 1,160 | $0.00 | 2,996 |
| 2010-04-05 | Grant / award (derivative) | 4,433 | $0.00 | 4,433 |
| 2010-04-05 | Grant / award | 1,836 | $0.00 | 1,836 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.