NPKI
NPK International Inc. · Services · Market cap $941.7M
Insiders sold $204K net in the last 90 days ·3 sellers, 0 buyers· 3 of 3 sales under Rule 10b5-1 plans· latest Form 4 filed Sep 10, 2026
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$5.6M
reported sales (SEC code S)
Unique Insiders
7
in the rolling window
Latest filing
Sep 24, 2026
Warren Matthew James
NPK International Inc. (NPKI) has 31 SEC Form 4 filings (48 transaction rows) in the rolling window, disclosed by 7 distinct insiders. Most recent filing: Sep 24, 2026.
Inside the rolling window, 7 insiders at NPK International Inc. reported no open-market purchases and 15 open-market sales totaling $5.6M. The most active filer is Director Lewis Michael A with 4 filings. Insiders have net sold $3.7M over the trailing 6 months. The most recent open-market filing is a sale of 2,991 shares by Chief Accounting Officer Warren Matthew James, dated Sep 9, 2026, worth $40K.
- Industry:Construction Materials
- CEO:Matthew S. Lanigan
- Employees:510
- HQ:The Woodlands, TX, US
- IPO:1990-09-06
| Source | |||||||
|---|---|---|---|---|---|---|---|
Warren Matthew JamesFirst filing | Chief Accounting Officer | Sale | 2,991 | $40K | Sep 10 | -15.9% | SEC ↗ |
ROBESON ROSE MFirst filing | Director | Sale | 10,000 | $135K | Aug 31 | -16.5% | SEC ↗ |
| Director | Sale | 2,013 | $29K | Aug 19 | -21.1% | SEC ↗ | |
| VP & President, Ind. Solutions | Sale | 8,325 | $123K | Jun 9 | -25.1% | SEC ↗ | |
LANIGAN MATTHEWFirst filing | President & CEO | Sale | 167,375 | $2.4M | Jun 5 | -22.3% | SEC ↗ |
Briggs LoriFirst filing | VP & President, Ind. Solutions | Sale | 10,446 | $152K | Jun 3 | -23.3% | SEC ↗ |
| Director | Sale | 2,013 | $31K | May 19 | -27.5% | SEC ↗ | |
| Senior Vice President and CFO | Sale | 15,000 | $226K | Apr 10 | -26.2% | SEC ↗ | |
| Senior Vice President and CFO | Sale | 35,000 | $508K | Apr 3 | -23.0% | SEC ↗ | |
| Senior Vice President and CFO | Sale | 15,000 | $225K | Mar 26 | -23.1% | SEC ↗ | |
| VP, General Counsel | Sale | 1,000 | $14K | Mar 18 | — | SEC ↗ | |
Fruge Mary CelesteFirst filing | VP, General Counsel | Sale | 11,193 | $149K | Mar 10 | — | SEC ↗ |
Piontek GreggFirst filing | Senior Vice President and CFO | Sale | 108,590 | $1.5M | Mar 5 | — | SEC ↗ |
Lewis Michael AFirst in 3 months | Director | Sale | 2,013 | $29K | Feb 25 | — | SEC ↗ |
Lewis Michael AFirst filing | Director | Sale | 2,013 | $24K | Nov 25 | — | SEC ↗ |
Earnings: last 7 quarters
Frequently asked questions
How many SEC Form 4 insider filings does NPKI have?
NPK International Inc. (NPKI) has 31 SEC Form 4 filings (48 transaction rows) in the rolling 365-day window, disclosed by 7 distinct insiders. Most recent filing: Sep 24, 2026.
When was the most recent SEC Form 4 filing for NPKI?
The most recent Form 4 filing for NPKI on Tracefour is dated Sep 24, 2026.
Who is the most active insider at NPKI?
The most active SEC Form 4 filer at NPKI in the rolling window is Director Lewis Michael A, with 4 filings.
What is the net insider flow at NPKI over the last 6 months?
Over the trailing 180 days, insiders at NPKI have net sold $3.7M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at NPKI in the current window?
Inside the rolling window, insiders at NPKI bought $0 and sold $5.6M based on SEC Form 4 filings.
Can I get alerts for NPKI insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at NPK International Inc. (NPKI). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
NPK International Inc. is in the Services sector.