Michael A Lewis insider trades: NPK International (NPKI) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Michael reports to the SEC
Open-market buys and sales
13 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 17, 2026 | NPKI | ↓ Sell10b5-1 | 2,013 | $14.26 | $29K | Direct | Aug 19, 2026 (2d) |
| Jul 27, 2026 | POR | ↓ Sell | 1,537 | $51.83 | $80K | Direct | Jul 28, 2026 (1d) |
| May 15, 2026 | NPKI | ↓ Sell10b5-1 | 2,013 | $15.30 | $31K | Direct | May 19, 2026 (4d) |
| Feb 23, 2026 | NPKI | ↓ Sell10b5-1 | 2,013 | $14.31 | $29K | Direct | Feb 25, 2026 (2d) |
| Nov 24, 2025 | NPKI | ↓ Sell10b5-1 | 2,013 | $12.00 | $24K | Direct | Nov 25, 2025 (1d) |
| Aug 25, 2025 | NPKI | ↓ Sell10b5-1 | 2,013 | $10.33 | $21K | Direct | Aug 26, 2025 (1d) |
| Jul 21, 2025 | POR | ↓ Sell | 1,937 | $40.10 | $78K | Direct | Jul 22, 2025 (1d) |
| Jun 16, 2025 | NPKI | ↓ Sell10b5-1 | 2,013 | $8.60 | $17K | Direct | Jun 17, 2025 (1d) |
| Dec 9, 2022 | NR | ↑ Buy | 5,251 | $3.98 | $21K | Direct | Dec 12, 2022 (3d) |
| May 7, 2012 | PGN | ↓ Sell | 1,850 | $54.04 | $100K | Direct | May 9, 2012 (2d) |
| Nov 8, 2011 | PGN | ↓ Sell | 3,800 | $53.36 | $203K | Direct | Nov 10, 2011 (2d) |
| May 9, 2011 | PGN | ↓ Sell | 4,000 | $47.26 | $189K | Direct | May 10, 2011 (1d) |
| May 12, 2009 | PGN | ↓ Sell | 2,900 | $35.40 | $103K | Direct | May 14, 2009 (2d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other NPKI insiders
Open-market trades in the last 12 months
About Michael A Lewis's insider trades
Michael A Lewis is a director at NPK International (NPKI). Since May 12, 2009, Michael has reported 1 open-market purchase worth $21K and 12 sales worth $902K on SEC Form 4. In the last 12 months: 5 sales ($192K).
6 sales (17% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include grants and awards (23 filings), shares withheld for taxes (16 filings), other transactions (2 filings), shares returned to the company (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every NPKI insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.