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| Latest Insider Trading | Top Insider Trading Recent Week | Top 10% Owner Trading Recent Week | Filter
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| Ticker | Owner | Relationship | Date | Transaction | Cost  |
#Shares | Value ($) | #Shares Total | SEC Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 01 '25 | Option Exercise | 0.00 | 84,169 | 0 | 921,026 | Jun 03 06:21 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 01 '24 | Option Exercise | 0.00 | 135,351 | 0 | 844,789 | Jun 04 06:33 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 01 '23 | Option Exercise | 0.00 | 91,223 | 0 | 602,410 | Jun 05 08:09 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 02 '23 | Option Exercise | 0.00 | 51,182 | 0 | 641,130 | Jun 05 08:09 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 01 '22 | Option Exercise | 0.00 | 171,711 | 0 | 541,990 | Jun 03 07:45 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 01 '21 | Option Exercise | 0.00 | 85,178 | 0 | 423,470 | Jun 03 07:47 AM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Nov 11 '20 | Buy | 1.08 | 15,000 | 16,200 | 55,000 | Nov 12 09:35 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 01 '20 | Option Exercise | 0.00 | 102,552 | 0 | 366,044 | Jun 03 11:26 AM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | May 08 '20 | Buy | 1.47 | 20,000 | 29,400 | 20,000 | May 12 07:01 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | May 11 '20 | Buy | 1.58 | 5,000 | 7,900 | 25,000 | May 12 07:01 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | May 12 '20 | Buy | 1.64 | 15,000 | 24,600 | 40,000 | May 12 07:01 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jul 02 '19 | Option Exercise | 0.00 | 41,922 | 0 | 278,263 | Jul 05 03:37 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 01 '19 | Option Exercise | 0.00 | 51,766 | 0 | 239,908 | Jun 04 03:14 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Aug 14 '18 | Option Exercise | 0.00 | 24,481 | 0 | 206,811 | Aug 15 06:30 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | Jun 01 '18 | Option Exercise | 0.00 | 49,277 | 0 | 190,674 | Jun 05 02:26 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | May 02 '18 | Option Exercise | 5.81 | 51,490 | 299,130 | 171,353 | May 03 06:18 PM |
| NPKI | Piontek Gregg | Senior Vice President and CFO | May 02 '18 | Sale | 10.51 | 51,490 | 540,908 | 119,863 | May 03 06:18 PM |
| NPKI | Piontek Gregg | Vice President and CFO | Aug 16 '17 | Option Exercise | 0.00 | 19,819 | 0 | 153,383 | Aug 18 11:37 AM |
| NPKI | Piontek Gregg | Vice President and CFO | Jun 01 '17 | Option Exercise | 0.00 | 34,470 | 0 | 142,991 | Jun 02 06:41 PM |
| NPKI | Piontek Gregg | Vice President and CFO | May 19 '17 | Sale | 8.04 | 34,372 | 276,291 | 111,220 | May 23 09:07 AM |
| NPKI | Piontek Gregg | Vice President and CFO | Aug 10 '16 | Option Exercise | 0.00 | 8,076 | 0 | 147,800 | Aug 12 04:57 PM |
| NPKI | Piontek Gregg | Vice President and CFO | Jun 01 '16 | Option Exercise | 0.00 | 12,162 | 0 | 145,501 | Jun 02 09:50 PM |
| NPKI | Piontek Gregg | VP, CFO, PAO | May 14 '13 | Option Exercise | 3.31 | 30,000 | 99,300 | 140,958 | May 15 06:23 PM |
| NPKI | Piontek Gregg | VP, CFO, PAO | May 14 '13 | Sale | 11.30 | 30,000 | 338,887 | 110,958 | May 15 06:23 PM |
| NPKI | Piontek Gregg | VP, Controller, PAO | May 06 '11 | Sale | 8.91 | 3,897 | 34,732 | 23,481 | May 10 04:55 PM |
| NPKI | Piontek Gregg | VP, Controller, PAO | May 06 '11 | Sale | 9.25 | 4,000 | 37,000 | 0 | May 10 04:55 PM |
| NPKI | Piontek Gregg | VP & Principal Acctng Officer | May 04 '10 | Sale | 8.00 | 2,000 | 16,000 | 14,765 | May 06 01:18 PM |
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