NPK International's three largest insider shareholders as of March 23, 2026 are Paul L Howes (President Ceo, 1.24Mn shares), Gregg Piontek (Senior Vice President And Cfo, 884.33K shares), David A Paterson (Vp President, Fluids Systems, 386.25K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Paul L Howes | President Ceo | 1,236,325 | 0 | 27 Aug, 2021 |
| Gregg Piontek | Senior Vice President And Cfo | 884,326 | 0 | 05 Mar, 2026 |
| David A Paterson | Vp President, Fluids Systems | 386,245 | 0 | 04 Jun, 2024 |
| Matthew Lanigan | President Ceo | 325,664 | 0 | 06 Oct, 2025 |
| Donald Win Young | 310,940 | 0 | 19 May, 2025 | |
| Douglas L White | Vp, Cao Treasurer | 305,245 | 0 | 17 Jun, 2025 |
| G Stephen Finley | 275,484 | 0 | 21 May, 2021 | |
| Mary Celeste Fruge | Vp, General Counsel | 265,213 | 0 | 10 Mar, 2026 |
| Mary Celeste Fruge | Vp, General Counsel | 265,213 | 0 | 18 Mar, 2026 |
| John C Minge | 245,384 | 0 | 19 May, 2025 | |
| Lori Briggs | Vp President, Ind. Solutions | 242,513 | 0 | 03 Oct, 2025 |
| Anthony James Best | 237,809 | 0 | 20 May, 2022 | |
| Edward Chipman Earle | Vp, General Counsel, Cao | 230,265 | 0 | 16 Dec, 2022 |
| Edward Chipman Earle | Vp, General Counsel, Cao | 230,265 | 0 | 16 Dec, 2022 |
| Rose M Robeson | 214,285 | 0 | 19 May, 2025 | |
| Michael A Lewis | 131,333 | 0 | 25 Feb, 2026 | |
| Claudia Michel Meer | 118,135 | 0 | 20 May, 2025 | |
| Gregg Piontek | Senior Vice President And Cfo | 0 | 65,000 | 09 Aug, 2022 |
| Joseph A Cutillo | 27,597 | 0 | 19 May, 2025 | |
| Roderick A. Larson | 15,097 | 0 | 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 |
|---|---|---|---|---|---|---|---|---|
| 16 Mar, 2026 | Mary Celeste Fruge | Common Stock | A | 1,000 | $4.32 | 266,213 | D | M |
| 16 Mar, 2026 | Mary Celeste Fruge | Common Stock | D | 1,000 | $13.56 | 265,213 | D | S |
| 16 Mar, 2026 | Mary Celeste Fruge | Non-Qualified Stock Option (right to buy) | D | 1,000 | $0.00 | 0 | D | M |
| 06 Mar, 2026 | Mary Celeste Fruge | Common Stock | A | 11,193 | $4.32 | 276,406 | D | M |
| 06 Mar, 2026 | Mary Celeste Fruge | Common Stock | A | 11,193 | $4.32 | 276,406 | D | M |
| 06 Mar, 2026 | Mary Celeste Fruge | Common Stock | D | 11,193 | $13.34 | 265,213 | D | S |
| 06 Mar, 2026 | Mary Celeste Fruge | Common Stock | D | 11,193 | $13.34 | 265,213 | D | S |
| 06 Mar, 2026 | Mary Celeste Fruge | Non-Qualified Stock Option (right to buy) | D | 11,193 | $0.00 | 1,000 | D | M |
| 06 Mar, 2026 | Mary Celeste Fruge | Non-Qualified Stock Option (right to buy) | D | 11,193 | $0.00 | 1,000 | D | M |
| 04 Mar, 2026 | Gregg Piontek | Common Stock | A | 73,590 | $4.32 | 992,916 | D | M |
| 04 Mar, 2026 | Gregg Piontek | Common Stock | D | 73,590 | $14.10 | 919,326 | D | S |
| 04 Mar, 2026 | Gregg Piontek | Common Stock | D | 35,000 | $14.02 | 884,326 | D | S |
| 04 Mar, 2026 | Gregg Piontek | Non-Qualified Stock Option (right to buy) | D | 73,590 | $0.00 | 0 | D | M |
| 23 Feb, 2026 | Michael A Lewis | Common Stock | D | 2,013 | $14.31 | 131,333 | D | S |
| 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 |
| 03 Sep, 2025 | Matthew Lanigan | Non-Qualified Stock Option (right to buy) | D | 1,000 | $10.38 | 0 | D | M |