Insider tradingForm 4
NPK International Inc. (NPKI) Insider Trading
3 open-market trades reported since Aug 19, 2026: 0 purchases worth $0 and 3 sales worth $204K.
By insider
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| Matthew James Warren | CAO | 0 | $0 | 1 | $40K |
| Rose M. Robeson | Director | 0 | $0 | 1 | $135K |
| Michael A. Lewis | Director | 0 | $0 | 1 | $29K |
All trades
| Filed | Insider | Type | Value | 3 mo. after |
|---|---|---|---|---|
| Sep 10 | Matthew James WarrenCAO | ▼ SELL10b5-1 | $40K | |
| Aug 31 | Rose M. RobesonDirector | ▼ SELL10b5-1 | $135K | |
| Aug 19 | Michael A. LewisDirector | ▼ SELL10b5-1 | $29K |
Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings