According to recent filings covering the 90 days ending February 19, 2026, the three most significant insider holders at NPK International are President & Ceo Paul L Howes (1.24Mn shares), Senior Vice President And Cfo Gregg Piontek (984.33K shares), Vp & President And Fluids Systems David A Paterson (386.25K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Paul L Howes | President & Ceo | 1,236,325 | 27 Aug, 2021 |
| Gregg Piontek | Senior Vice President And Cfo | 984,326 | 03 Jun, 2025 |
| David A Paterson | Vp & President And Fluids Systems | 386,245 | 04 Jun, 2024 |
| Matthew Lanigan | President & Ceo | 325,664 | 06 Oct, 2025 |
| Donald Win Young | 310,940 | 19 May, 2025 | |
| Douglas L White | Vp And Cao & Treasurer | 305,245 | 17 Jun, 2025 |
| G Stephen Finley | 275,484 | 21 May, 2021 | |
| Mary Celeste Fruge | Vp And General Counsel | 265,186 | 03 Jun, 2025 |
| John C Minge | 245,384 | 19 May, 2025 | |
| Lori Briggs | Vp & President And Ind. Solutions | 242,513 | 03 Oct, 2025 |
| Anthony James Best | 237,809 | 20 May, 2022 | |
| Edward Chipman Earle | Vp And General Counsel And Cao | 230,265 | 16 Dec, 2022 |
| Rose M Robeson | 214,285 | 19 May, 2025 | |
| Michael A Lewis | 133,346 | 25 Nov, 2025 | |
| Claudia Michel Meer | 118,135 | 20 May, 2025 | |
| Joseph A Cutillo | 27,597 | 19 May, 2025 | |
| Roderick A. Larson | 15,097 | 19 May, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 24 Nov, 2025 | Michael A Lewis | Common Stock | D | 2,013 | $12.00 | 133,346 | D | S |
| 03 Oct, 2025 | Matthew Lanigan | Common Stock | D | 770,249 | $0.00 | 325,664 | D | G |
| 01 Oct, 2025 | Lori Briggs | Common Stock | D | 10,108 | $11.51 | 242,513 | D | S |
| 03 Sep, 2025 | Matthew Lanigan | Common Stock | A | 1,000 | $4.32 | 1,096,913 | D | M |
| 03 Sep, 2025 | Matthew Lanigan | Common Stock | D | 1,000 | $10.38 | 1,095,913 | D | S |
| 25 Aug, 2025 | Michael A Lewis | Common Stock | D | 2,013 | $10.33 | 135,359 | D | S |
| 22 Aug, 2025 | Matthew Lanigan | Common Stock | D | 68,896 | $10.34 | 1,095,913 | D | S |
| 22 Aug, 2025 | Matthew Lanigan | Common Stock | A | 68,896 | $4.32 | 1,164,809 | D | M |
| 11 Aug, 2025 | Lori Briggs | Common Stock | D | 8,005 | $9.51 | 252,621 | D | S |
| 09 Jul, 2025 | Lori Briggs | Common Stock | D | 8,005 | $8.57 | 260,626 | D | S |
| 16 Jun, 2025 | Michael A Lewis | Common Stock | D | 2,013 | $8.60 | 137,372 | D | S |
| 14 Jun, 2025 | Douglas L White | Common Stock | A | 730 | $6.51 | 305,245 | D | A |
| 14 Jun, 2025 | Douglas L White | - | - | 305,245 | D | |||
| 06 Jun, 2025 | Lori Briggs | Common Stock | D | 9,704 | $8.38 | 268,631 | D | S |
| 01 Jun, 2025 | Gregg Piontek | Common Stock | D | 15,889 | $8.09 | 887,906 | D | F |
| 01 Jun, 2025 | Gregg Piontek | Common Stock | D | 17,231 | $8.09 | 903,795 | D | F |
| 01 Jun, 2025 | Gregg Piontek | Common Stock | A | 40,379 | $0.00 | 919,326 | D | M |
| 01 Jun, 2025 | Gregg Piontek | Common Stock | A | 43,790 | $0.00 | 921,026 | D | M |
| 01 Jun, 2025 | Gregg Piontek | Common Stock | D | 8,959 | $8.09 | 878,947 | D | F |
| 01 Jun, 2025 | Douglas L White | - | - | 317,106 | D |