13 insiders reported 96 Form 4 transactions for NPK International Inc. (NPKI) over the past 18 months (most recent 2026-08-19). Recent activity: Lewis Michael A (Director) Sell 2,013 shares, Pederson Kristen J. (Director) Buy 6,614 shares, Briggs Lori (VP & President, Ind. Solutions) Sell 8,325 shares, LANIGAN MATTHEW (President & CEO) Sell 167,375 shares, Piontek Gregg (Senior Vice President and CFO) Sell 11,241 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-19 | Lewis Michael A | Director | Sell | 2,013 | $28,705 |
| 2026-07-29 | Pederson Kristen J. | Director | Buy | 6,614 | $0 |
| 2026-06-09 | Briggs Lori | VP & President, Ind. Solutions | Sell | 8,325 | $122,790 |
| 2026-06-05 | LANIGAN MATTHEW | President & CEO | Sell | 167,375 | $2.4M |
| 2026-06-03 | Piontek Gregg | Senior Vice President and CFO | Sell | 11,241 | $160,859 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Sell | 5,401 | $77,288 |
| 2026-06-03 | Piontek Gregg | Senior Vice President and CFO | Sell | 8,959 | $128,203 |
| 2026-06-03 | Fruge Mary Celeste | VP, General Counsel | Sell | 3,833 | $54,850 |
| 2026-06-03 | LANIGAN MATTHEW | President & CEO | Sell | 22,232 | $318,140 |
| 2026-06-03 | Piontek Gregg | Senior Vice President and CFO | Sell | 15,889 | $227,372 |
| 2026-06-03 | LANIGAN MATTHEW | President & CEO | Sell | 27,894 | $399,163 |
| 2026-06-03 | Fruge Mary Celeste | VP, General Counsel | Sell | 5,218 | $74,670 |
| 2026-06-03 | LANIGAN MATTHEW | President & CEO | Sell | 39,423 | $564,143 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Sell | 6,777 | $96,979 |
| 2026-06-03 | Fruge Mary Celeste | VP, General Counsel | Sell | 6,797 | $97,265 |
| 2026-06-03 | Piontek Gregg | Senior Vice President and CFO | Buy | 40,379 | $0 |
| 2026-06-03 | LANIGAN MATTHEW | President & CEO | Buy | 100,188 | $0 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Buy | 24,340 | $0 |
| 2026-06-03 | Fruge Mary Celeste | VP, General Counsel | Buy | 17,274 | $0 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Sell | 10,446 | $152,278 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Sell | 9,577 | $137,047 |
| 2026-05-21 | LARSON RODERICK A. | Director | Buy | 8,558 | $0 |
| 2026-05-21 | ROBESON ROSE M | Director | Buy | 10,862 | $0 |
| 2026-05-21 | Piontek Gregg | Senior Vice President and CFO | Buy | 34,566 | $0 |
| 2026-05-21 | Lewis Michael A | Director | Buy | 8,558 | $0 |
Source: SEC Form 4 filings · as of 2026-08-19