SEC CIK 1418328
Piontek Gregg
Reported ownership across 1 company, sourced from SEC Form 4 filings and updated daily.
Current Positions
| Company | Shares Owned | As Of |
|---|---|---|
| NPKIview stock → | 858,182 | 2026-06-01 |
Position History — NPKI
Reported shares owned immediately after each Form 4 transaction, over time.
Recent Filings — NPKI
| Date | Activity | Shares | Price | Owned After |
|---|---|---|---|---|
| 2026-06-01 | Option exercise (derivative) | 40,379 | $0.00 | 0 |
| 2026-06-01 | Option exercise | 40,379 | $0.00 | 858,182 |
| 2026-06-01 | Tax withholding | 11,241 | $14.31 | 817,803 |
| 2026-06-01 | Tax withholding | 15,889 | $14.31 | 829,044 |
| 2026-06-01 | Tax withholding | 8,959 | $14.31 | 844,933 |
| 2026-05-19 | Grant / award | 34,566 | $0.00 | 853,892 |
| 2026-04-09 | Open-market sale | 15,000 | $15.04 | 819,326 |
| 2026-04-01 | Open-market sale | 35,000 | $14.51 | 834,326 |
| 2026-03-25 | Open-market sale | 15,000 | $15.03 | 869,326 |
| 2026-03-04 | Option exercise (derivative) | 73,590 | $0.00 | 0 |
| 2026-03-04 | Open-market sale | 35,000 | $14.02 | 884,326 |
| 2026-03-04 | Open-market sale | 73,590 | $14.10 | 919,326 |
| 2026-03-04 | Option exercise | 73,590 | $4.32 | 992,916 |
| 2025-06-01 | Option exercise (derivative) | 43,790 | $0.00 | 80,758 |
| 2025-06-01 | Option exercise (derivative) | 40,379 | $0.00 | 40,379 |
| 2025-06-01 | Tax withholding | 17,231 | $8.09 | 903,795 |
| 2025-06-01 | Option exercise | 43,790 | $0.00 | 921,026 |
| 2025-06-01 | Tax withholding | 15,889 | $8.09 | 887,906 |
| 2025-06-01 | Tax withholding | 8,959 | $8.09 | 878,947 |
| 2025-06-01 | Option exercise | 40,379 | $0.00 | 919,326 |
| 2025-05-14 | Grant / award | 85,706 | $0.00 | 877,236 |
| 2024-06-01 | Option exercise (derivative) | 40,380 | $0.00 | 124,548 |
| 2024-06-01 | Option exercise (derivative) | 51,181 | $0.00 | 208,718 |
| 2024-06-01 | Option exercise (derivative) | 43,790 | $0.00 | 164,928 |
| 2024-06-01 | Option exercise | 51,181 | $0.00 | 760,619 |
| 2024-06-01 | Option exercise | 43,790 | $0.00 | 804,409 |
| 2024-06-01 | Option exercise | 40,380 | $0.00 | 844,789 |
| 2024-06-01 | Tax withholding | 17,231 | $8.48 | 811,669 |
| 2024-06-01 | Tax withholding | 20,139 | $8.48 | 791,530 |
| 2024-06-01 | Tax withholding | 15,889 | $8.48 | 828,900 |
| 2024-05-15 | Grant / award | 68,308 | $0.00 | 709,438 |
| 2023-06-02 | Option exercise (derivative) | 51,182 | $0.00 | 259,899 |
| 2023-06-02 | Option exercise | 51,182 | $0.00 | 641,130 |
| 2023-06-01 | Option exercise (derivative) | 43,791 | $0.00 | 358,513 |
| 2023-06-01 | Option exercise (derivative) | 47,432 | $0.00 | 311,081 |
| 2023-06-01 | Tax withholding | 10,663 | $3.67 | 554,978 |
| 2023-06-01 | Option exercise | 47,432 | $0.00 | 602,410 |
| 2023-06-01 | Tax withholding | 12,462 | $3.67 | 589,948 |
| 2023-06-01 | Option exercise | 43,791 | $0.00 | 565,641 |
| 2023-05-18 | Grant / award (derivative) | 121,138 | $0.00 | 402,304 |
| 2022-08-05 | Open-market buy | 10,000 | $2.55 | 65,000 |
| 2022-06-01 | Option exercise (derivative) | 47,433 | $0.00 | 332,348 |
| 2022-06-01 | Option exercise (derivative) | 51,182 | $0.00 | 281,166 |
| 2022-06-01 | Option exercise (derivative) | 23,096 | $0.00 | 379,781 |
| 2022-06-01 | Option exercise (derivative) | 50,000 | $0.00 | 402,877 |
| 2022-06-01 | Option exercise | 23,096 | $0.00 | 471,127 |
| 2022-06-01 | Tax withholding | 9,088 | $4.48 | 462,039 |
| 2022-06-01 | Option exercise | 47,433 | $0.00 | 509,472 |
| 2022-06-01 | Tax withholding | 18,664 | $4.48 | 490,808 |
| 2022-06-01 | Option exercise | 51,182 | $0.00 | 541,990 |
| 2022-06-01 | Tax withholding | 20,140 | $4.48 | 521,850 |
| 2022-06-01 | Tax withholding | 19,675 | $4.48 | 448,031 |
| 2022-06-01 | Option exercise | 50,000 | $0.00 | 467,706 |
| 2022-05-19 | Grant / award (derivative) | 132,090 | $0.00 | 453,596 |
| 2022-05-19 | Grant / award (derivative) | 131,371 | $0.00 | 452,877 |
| 2021-06-01 | Option exercise (derivative) | 14,649 | $0.00 | 167,961 |
| 2021-06-01 | Option exercise (derivative) | 47,433 | $0.00 | 205,706 |
| 2021-06-01 | Option exercise (derivative) | 23,096 | $0.00 | 182,610 |
| 2021-06-01 | Tax withholding | 5,764 | $3.51 | 417,706 |
| 2021-06-01 | Option exercise | 47,433 | $0.00 | 413,477 |
| 2021-06-01 | Option exercise | 23,096 | $0.00 | 417,909 |
| 2021-06-01 | Tax withholding | 18,664 | $3.51 | 394,813 |
| 2021-06-01 | Tax withholding | 9,088 | $3.51 | 408,821 |
| 2021-06-01 | Option exercise | 14,649 | $0.00 | 423,470 |
| 2021-05-20 | Grant / award (derivative) | 153,545 | $0.00 | 406,684 |
| 2020-11-11 | Open-market buy | 15,000 | $1.08 | 55,000 |
| 2020-06-01 | Option exercise (derivative) | 14,807 | $0.00 | 340,884 |
| 2020-06-01 | Option exercise (derivative) | 50,000 | $0.00 | 290,884 |
| 2020-06-01 | Option exercise (derivative) | 23,096 | $0.00 | 253,139 |
| 2020-06-01 | Option exercise (derivative) | 14,649 | $0.00 | 276,235 |
| 2020-06-01 | Option exercise | 14,807 | $0.00 | 278,299 |
| 2020-06-01 | Option exercise | 50,000 | $0.00 | 328,299 |
| 2020-06-01 | Option exercise | 23,096 | $0.00 | 366,044 |
| 2020-06-01 | Option exercise | 14,649 | $0.00 | 342,948 |
| 2020-05-21 | Grant / award (derivative) | 142,298 | $0.00 | 355,691 |
| 2020-05-12 | Open-market buy | 15,000 | $1.64 | 40,000 |
| 2020-05-11 | Open-market buy | 5,000 | $1.58 | 25,000 |
| 2020-05-08 | Open-market buy | 20,000 | $1.47 | 20,000 |
| 2019-07-02 | Option exercise (derivative) | 41,922 | $0.00 | 0 |
| 2019-07-02 | Tax withholding | 14,771 | $7.12 | 263,492 |
| 2019-07-02 | Option exercise | 41,922 | $0.00 | 278,263 |
| 2019-06-01 | Option exercise (derivative) | 14,808 | $0.00 | 228,043 |
| 2019-06-01 | Option exercise (derivative) | 22,308 | $0.00 | 242,851 |
| 2019-06-01 | Option exercise (derivative) | 14,650 | $0.00 | 213,393 |
| 2019-06-01 | Tax withholding | 3,567 | $6.99 | 236,341 |
| 2019-06-01 | Option exercise | 14,650 | $0.00 | 239,908 |
| 2019-06-01 | Tax withholding | 3,605 | $6.99 | 225,258 |
| 2019-06-01 | Option exercise | 14,808 | $0.00 | 228,863 |
| 2019-06-01 | Tax withholding | 5,431 | $6.99 | 214,055 |
| 2019-06-01 | Option exercise | 22,308 | $0.00 | 219,486 |
| 2019-05-23 | Grant / award (derivative) | 69,288 | $0.00 | 265,159 |
| 2018-08-14 | Option exercise (derivative) | 24,481 | $0.00 | 41,922 |
| 2018-08-14 | Tax withholding | 9,633 | $10.40 | 197,178 |
| 2018-08-14 | Option exercise | 24,481 | $0.00 | 206,811 |
| 2018-06-01 | Option exercise (derivative) | 22,308 | $0.00 | 195,871 |
| 2018-06-01 | Option exercise (derivative) | 12,161 | $0.00 | 232,987 |
| 2018-06-01 | Option exercise (derivative) | 14,808 | $0.00 | 218,179 |
| 2018-06-01 | Option exercise | 12,161 | $0.00 | 160,124 |
| 2018-06-01 | Tax withholding | 2,961 | $10.85 | 157,163 |
| 2018-06-01 | Option exercise | 14,808 | $0.00 | 171,971 |
| 2018-06-01 | Tax withholding | 3,605 | $10.85 | 168,366 |
| 2018-06-01 | Tax withholding | 8,344 | $10.85 | 182,330 |
| 2018-06-01 | Option exercise | 22,308 | $0.00 | 190,674 |
| 2018-05-16 | Grant / award (derivative) | 43,948 | $0.00 | 145,148 |
| 2018-05-16 | Grant / award (derivative) | 100,000 | $0.00 | 245,148 |
| 2018-05-02 | Option exercise (derivative) | 23,390 | $0.00 | 0 |
| 2018-05-02 | Option exercise | 28,100 | $7.89 | 147,963 |
| 2018-05-02 | Option exercise | 23,390 | $3.31 | 171,353 |
| 2018-05-02 | Open-market sale | 51,490 | $10.51 | 119,863 |
| 2017-08-16 | Option exercise (derivative) | 19,819 | $0.00 | 66,403 |
| 2017-08-16 | Option exercise | 19,819 | $0.00 | 153,383 |
| 2017-08-16 | Tax withholding | 5,420 | $7.50 | 147,963 |
| 2017-06-01 | Option exercise (derivative) | 12,162 | $0.00 | 123,508 |
| 2017-06-01 | Option exercise (derivative) | 22,308 | $0.00 | 101,200 |
| 2017-06-01 | Tax withholding | 3,326 | $7.54 | 133,564 |
| 2017-06-01 | Tax withholding | 2,699 | $7.54 | 108,521 |
| 2017-06-01 | Option exercise | 12,162 | $0.00 | 120,683 |
| 2017-06-01 | Option exercise | 22,308 | $0.00 | 142,991 |
| 2017-06-01 | Tax withholding | 6,101 | $7.54 | 136,890 |
| 2017-05-19 | Open-market sale | 31,284 | $8.04 | 114,308 |
| 2017-05-19 | Open-market sale | 3,088 | $8.04 | 111,220 |
| 2017-05-18 | Grant / award (derivative) | 44,423 | $0.00 | 135,670 |
| 2016-08-10 | Option exercise (derivative) | 17,584 | $0.00 | 86,222 |
| 2016-08-10 | Option exercise | 8,076 | $0.00 | 147,800 |
| 2016-08-10 | Tax withholding | 2,208 | $6.72 | 145,592 |
| 2016-06-09 | Tax withholding | 2,451 | $5.36 | 139,724 |
| 2016-06-01 | Option exercise (derivative) | 12,162 | $0.00 | 91,247 |
| 2016-06-01 | Tax withholding | 2,666 | $4.99 | 133,339 |
| 2016-06-01 | Tax withholding | 3,326 | $4.99 | 142,175 |
| 2016-06-01 | Option exercise | 12,162 | $0.00 | 145,501 |
| 2016-05-19 | Grant / award (derivative) | 41,922 | $0.00 | 103,806 |
| 2016-05-19 | Grant / award (derivative) | 73,590 | $0.00 | 73,590 |
| 2016-05-19 | Grant / award (derivative) | 66,924 | $0.00 | 103,409 |
| 2015-12-21 | Tax withholding | 2,735 | $5.33 | 136,005 |
| 2015-06-09 | Tax withholding | 3,928 | $8.66 | 138,740 |
| 2015-06-09 | Tax withholding | 2,451 | $8.66 | 142,668 |
| 2015-06-01 | Tax withholding | 2,699 | $8.70 | 145,119 |
| 2015-05-22 | Grant / award (derivative) | 24,481 | $0.00 | 61,884 |
| 2015-05-22 | Grant / award (derivative) | 41,945 | $0.00 | 41,945 |
| 2015-05-22 | Grant / award (derivative) | 36,485 | $0.00 | 36,485 |
| 2014-10-17 | Tax withholding | 1,823 | $10.64 | 147,818 |
| 2014-06-09 | Tax withholding | 7,340 | $11.99 | 149,641 |
| 2014-05-21 | Grant / award (derivative) | 19,819 | $0.00 | 37,403 |
| 2014-05-21 | Grant / award (derivative) | 33,365 | $0.00 | 33,365 |
| 2014-05-21 | Grant / award | 29,611 | $0.00 | 156,981 |
| 2013-12-21 | Tax withholding | 2,735 | $11.90 | 127,370 |
| 2013-10-17 | Tax withholding | 1,823 | $13.20 | 130,105 |
| 2013-06-11 | Tax withholding | 5,925 | $11.45 | 131,928 |
| 2013-06-06 | Grant / award (derivative) | 17,584 | $0.00 | 17,584 |
| 2013-06-06 | Grant / award (derivative) | 28,336 | $0.00 | 28,336 |
| 2013-06-06 | Grant / award | 26,895 | $0.00 | 137,853 |
| 2013-05-14 | Option exercise (derivative) | 30,000 | $0.00 | 23,390 |
| 2013-05-14 | Open-market sale | 400 | $11.34 | 110,958 |
| 2013-05-14 | Open-market sale | 1,700 | $11.33 | 111,358 |
| 2013-05-14 | Open-market sale | 143 | $11.33 | 113,058 |
| 2013-05-14 | Open-market sale | 2,919 | $11.32 | 113,201 |
| 2013-05-14 | Open-market sale | 3,921 | $11.31 | 116,120 |
| 2013-05-14 | Open-market sale | 100 | $11.31 | 120,041 |
| 2013-05-14 | Open-market sale | 10,371 | $11.30 | 120,141 |
| 2013-05-14 | Open-market sale | 2,946 | $11.29 | 130,512 |
| 2013-05-14 | Open-market sale | 1,902 | $11.28 | 133,458 |
| 2013-05-14 | Open-market sale | 940 | $11.27 | 135,360 |
| 2013-05-14 | Open-market sale | 4,658 | $11.26 | 136,300 |
| 2013-05-14 | Option exercise | 30,000 | $3.31 | 140,958 |
| 2012-10-17 | Tax withholding | 1,763 | $7.11 | 110,433 |
| 2012-06-09 | Tax withholding | 930 | $5.56 | 112,196 |
| 2012-06-09 | Tax withholding | 1,002 | $5.56 | 113,126 |
| 2012-06-06 | Grant / award (derivative) | 83,171 | $0.00 | 83,171 |
| 2012-06-06 | Grant / award | 43,087 | $0.00 | 114,128 |
| 2012-03-04 | Tax withholding | 1,988 | $7.84 | 71,041 |
| 2011-12-21 | Grant / award | 20,000 | $0.00 | 73,029 |
| 2011-10-17 | Grant / award | 20,000 | $0.00 | 53,029 |
| 2011-06-13 | Tax withholding | 1,002 | $0.00 | 33,029 |
| 2011-06-09 | Grant / award (derivative) | 19,246 | $0.00 | 19,246 |
| 2011-06-09 | Grant / award | 10,550 | $0.00 | 34,031 |
| 2011-05-06 | Open-market sale | 853 | $8.92 | 26,481 |
| 2011-05-06 | Open-market sale | 44 | $8.92 | 27,334 |
| 2011-05-06 | Open-market sale | 3,000 | $8.91 | 23,481 |
| 2011-05-06 | Open-market sale | 4,000 | $9.25 | 0 |
| 2010-06-09 | Grant / award | 11,366 | $0.00 | 26,131 |
| 2010-05-04 | Open-market sale | 2,000 | $8.00 | 14,765 |
| 2010-03-04 | Tax withholding | 2,448 | $5.44 | 16,765 |
| 2009-06-10 | Grant / award (derivative) | 53,390 | $0.00 | 53,390 |
| 2008-06-10 | Grant / award (derivative) | 28,100 | $0.00 | 28,100 |
| 2008-03-05 | Grant / award | 15,000 | $0.00 | 19,000 |
| 2007-11-09 | Open-market buy | 4,000 | $5.50 | 4,000 |
| 2007-06-12 | Grant / award (derivative) | 20,000 | $0.00 | 20,000 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.