15 insiders reported 98 Form 4 transactions for NPK International Inc. (NPKI) over the past 18 months (most recent 2026-09-24). Recent activity: Barton III Alvin James (EVP Commercial Growth & Ops.) Buy 12,850 shares, Warren Matthew James (Chief Accounting Officer) Sell 2,991 shares, ROBESON ROSE M (Director) Sell 10,000 shares, Lewis Michael A (Director) Sell 2,013 shares, Pederson Kristen J. (Director) Buy 6,614 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-24 | Barton III Alvin James | EVP Commercial Growth & Ops. | Buy | 12,850 | $0 |
| 2026-09-10 | Warren Matthew James | Chief Accounting Officer | Sell | 2,991 | $40,113 |
| 2026-08-31 | ROBESON ROSE M | Director | Sell | 10,000 | $134,917 |
| 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 | $122,794 |
| 2026-06-05 | LANIGAN MATTHEW | President & CEO | Sell | 167,375 | $2.4M |
| 2026-06-03 | LANIGAN MATTHEW | President & CEO | Sell | 22,232 | $318,140 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Sell | 9,577 | $137,047 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Sell | 6,777 | $96,979 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Buy | 24,340 | $0 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Sell | 10,446 | $152,303 |
| 2026-06-03 | Briggs Lori | VP & President, Ind. Solutions | Sell | 5,401 | $77,288 |
| 2026-06-03 | LANIGAN MATTHEW | President & CEO | Sell | 27,894 | $399,163 |
| 2026-06-03 | LANIGAN MATTHEW | President & CEO | Sell | 39,423 | $564,143 |
| 2026-06-03 | LANIGAN MATTHEW | President & CEO | Buy | 100,188 | $0 |
| 2026-06-03 | Piontek Gregg | Senior Vice President and CFO | Sell | 8,959 | $128,203 |
| 2026-06-03 | Piontek Gregg | Senior Vice President and CFO | Sell | 15,889 | $227,372 |
| 2026-06-03 | Piontek Gregg | Senior Vice President and CFO | Sell | 11,241 | $160,859 |
| 2026-06-03 | Piontek Gregg | Senior Vice President and CFO | Buy | 40,379 | $0 |
| 2026-06-03 | Fruge Mary Celeste | VP, General Counsel | Sell | 3,833 | $54,850 |
| 2026-06-03 | Fruge Mary Celeste | VP, General Counsel | Sell | 5,218 | $74,670 |
| 2026-06-03 | Fruge Mary Celeste | VP, General Counsel | Sell | 6,797 | $97,265 |
| 2026-06-03 | Fruge Mary Celeste | VP, General Counsel | Buy | 17,274 | $0 |
| 2026-05-21 | LARSON RODERICK A. | Director | Buy | 8,558 | $0 |
来源：SEC Form 4 申报文件 · 截至 2026-09-24