StockCIK 71829
NPK International Inc. (NPKI): Insider Trades and Fund Holdings
In the past 12 months, NPK International Inc. insiders reported 0 open-market purchases worth $0 and 3 sales worth $204K; 3 of the sales were reported as made under a 10b5-1 trading plan.
0Insider buys, 12 months
$0Bought by insiders, 12 months
$204KSold by insiders, 12 months
1Tracked funds holding
Recent insider trades
Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Sep 10, 2026.
| Filed | Insider | Type | Value |
|---|---|---|---|
| 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
Insiders who traded in the past year
| 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 |
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Tracked funds that report NPKI
From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.
| Fund | Shares | Value | Change |
|---|---|---|---|
| Renaissance Technologies | 225,367 | $3.59M | ▼ −37.8% |
Source: SEC Form 13F-HR filings, retrieved Oct 28, 2026. How we read filings
Reading these numbers
Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →