As of the latest Form 4 filed Jun 9, 2026.
What NPK International Inc. insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 23 most recent filings for NPKI.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-09 | 2026-06-08 | Briggs Lori VP & President, Ind. Solutions | SSale | −8.32K | $14.75 | $123K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | LANIGAN MATTHEW President & CEO | SSale | −167K | $14.43 | $2.42M | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | Briggs Lori VP & President, Ind. Solutions | SSale | −10.4K | $14.58 | $152K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Fruge Mary Celeste VP, General Counsel | MExercise | +17.3K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Fruge Mary Celeste, VP, General Counsel | FTax | −6.80K | $14.31 | $97.3K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Fruge Mary Celeste, VP, General Counsel | FTax | −5.22K | $14.31 | $74.7K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Fruge Mary Celeste, VP, General Counsel | FTax | −3.83K | $14.31 | $54.9K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Briggs Lori VP & President, Ind. Solutions | MExercise | +24.3K | $0.00 | $0.00 | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Briggs Lori, VP & President, Ind. Solutions | FTax | −6.78K | $14.31 | $97.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Briggs Lori, VP & President, Ind. Solutions | FTax | −9.58K | $14.31 | $137K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Briggs Lori, VP & President, Ind. Solutions | FTax | −5.40K | $14.31 | $77.3K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | LANIGAN MATTHEW President & CEO | MExercise | +100K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | LANIGAN MATTHEW, President & CEO | FTax | −39.4K | $14.31 | $564K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | LANIGAN MATTHEW, President & CEO | FTax | −27.9K | $14.31 | $399K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | LANIGAN MATTHEW, President & CEO | FTax | −22.2K | $14.31 | $318K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Piontek Gregg Senior Vice President and CFO | MExercise | +40.4K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Piontek Gregg, Senior Vice President and CFO | FTax | −11.2K | $14.31 | $161K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Piontek Gregg, Senior Vice President and CFO | FTax | −15.9K | $14.31 | $227K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Piontek Gregg, Senior Vice President and CFO | FTax | −8.96K | $14.31 | $128K | No | Form 4 ↗ |
| 2026-04-10 | 2026-04-09 | Piontek Gregg Senior Vice President and CFO | SSale | −15.0K | $15.05 | $226K | Yes (planned) | Form 4 ↗ |
| 2026-03-26 | 2026-03-25 | Piontek Gregg Senior Vice President and CFO | SSale | −15.0K | $15.03 | $225K | Yes (planned) | Form 4 ↗ |
| 2026-03-18 | 2026-03-16 | Fruge Mary Celeste VP, General Counsel | SSale | −1.00K | $13.56 | $13.6K | Yes (planned) | Form 4 ↗ |
| 2026-03-18 | 2026-03-16 | Fruge Mary Celeste, VP, General Counsel | MExercise | +1.00K | $4.32 | $4.32K | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also NPKI’s full analysis or the market-wide insider trading feed. The tabs above jump to NPKI’s other SEC data.
Source: SEC Form 4 filings for NPKI, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.