LANIGAN MATTHEW (CIK 1672978) reported 17 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-06-05). Recent activity: Sell NPKI (167,375 shares), Sell NPKI (22,232 shares), Sell NPKI (27,894 shares), Sell NPKI (39,423 shares), Buy NPKI (100,188 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-05 | NPK International Inc. (NPKI) | President & CEO | Sell | 167,375 | $2.4M |
| 2026-06-03 | NPK International Inc. (NPKI) | President & CEO | Sell | 22,232 | $318,140 |
| 2026-06-03 | NPK International Inc. (NPKI) | President & CEO | Sell | 27,894 | $399,163 |
| 2026-06-03 | NPK International Inc. (NPKI) | President & CEO | Sell | 39,423 | $564,143 |
| 2026-06-03 | NPK International Inc. (NPKI) | President & CEO | Buy | 100,188 | $0 |
| 2026-05-21 | NPK International Inc. (NPKI) | President & CEO | Buy | 85,771 | $0 |
| 2025-10-06 | NPK International Inc. (NPKI) | President & CEO | Sell | 770,249 | $0 |
| 2025-09-04 | NPK International Inc. (NPKI) | President & CEO | Buy | 1,000 | $4,320 |
| 2025-09-04 | NPK International Inc. (NPKI) | President & CEO | Sell | 1,000 | $10,380 |
| 2025-08-26 | NPK International Inc. (NPKI) | President & CEO | Buy | 68,896 | $297,631 |
| 2025-08-26 | NPK International Inc. (NPKI) | President & CEO | Sell | 68,896 | $712,385 |
| 2025-06-03 | NPK International Inc. (NPKI) | President & CEO | Buy | 108,651 | $0 |
| 2025-06-03 | NPK International Inc. (NPKI) | President & CEO | Buy | 100,188 | $0 |
| 2025-06-03 | NPK International Inc. (NPKI) | President & CEO | Sell | 22,232 | $179,857 |
| 2025-06-03 | NPK International Inc. (NPKI) | President & CEO | Sell | 39,423 | $318,932 |
| 2025-06-03 | NPK International Inc. (NPKI) | President & CEO | Sell | 42,754 | $345,880 |
| 2025-05-16 | NPK International Inc. (NPKI) | President & CEO | Buy | 212,667 | $0 |
Source: SEC Form 4 filings · as of 2026-06-05