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NPK International

NPK International (NYSE: NPKI) insider transactions

In the twelve months to 10 November 2026, executives and directors of NPK International reported 16 open-market sales of 392,972 shares ($5.6m) and 1 open-market purchase of 15,000 shares ($138,600), by 8 people, according to the Form 4 filings they submitted to the SEC.

Latest transactions

The 20 most recent transactions in NPK International shares reported on Form 4
DateInsiderRoleTransactionSharesPriceHeld afterFiling
2 November 2026Minge John CDirectorOpen-market purchase+15,000$9.24268,942Form 4
22 September 2026Barton III Alvin JamesEVP Commercial Growth & Ops.Grant or award+12,850—12,850Form 4
9 September 2026Warren Matthew JamesChief Accounting OfficerOpen-market sale, 10b5-1 plan−2,991$13.4151,439Form 4
27 August 2026Robeson Rose MDirectorOpen-market sale, 10b5-1 plan−10,000$13.49215,147Form 4
17 August 2026Lewis Michael ADirectorOpen-market sale, 10b5-1 plan−2,013$14.26135,865Form 4
28 July 2026Pederson Kristen J.DirectorGrant or award+6,614—6,614Form 4
8 June 2026Briggs LoriVP & President, Ind. SolutionsOpen-market sale, 10b5-1 plan−8,325$14.75247,165Form 4
3 June 2026Lanigan MatthewPresident & CEOOpen-market sale, 10b5-1 plan−167,375$14.43254,699Form 4
2 June 2026Briggs LoriVP & President, Ind. SolutionsOpen-market sale, 10b5-1 plan−10,446$14.58255,490Form 4
1 June 2026Piontek GreggSenior Vice President and CFOShares withheld for tax−8,959$14.31844,933Form 4
1 June 2026Piontek GreggSenior Vice President and CFOShares withheld for tax−15,889$14.31829,044Form 4
1 June 2026Piontek GreggSenior Vice President and CFOShares withheld for tax−11,241$14.31817,803Form 4
1 June 2026Piontek GreggSenior Vice President and CFOOption exercise+40,379—858,182Form 4
1 June 2026Lanigan MatthewPresident & CEOShares withheld for tax−22,232$14.31389,203Form 4
1 June 2026Lanigan MatthewPresident & CEOShares withheld for tax−27,894$14.31361,309Form 4
1 June 2026Lanigan MatthewPresident & CEOShares withheld for tax−39,423$14.31321,886Form 4
1 June 2026Lanigan MatthewPresident & CEOOption exercise+100,188—422,074Form 4
1 June 2026Briggs LoriVP & President, Ind. SolutionsShares withheld for tax, 10b5-1 plan−5,401$14.31257,950Form 4
1 June 2026Briggs LoriVP & President, Ind. SolutionsShares withheld for tax, 10b5-1 plan−9,577$14.31248,373Form 4
1 June 2026Briggs LoriVP & President, Ind. SolutionsShares withheld for tax, 10b5-1 plan−6,777$14.31241,596Form 4

Names appear as in the filing, surname first. A dash in the price column means the filing reports none, as in grants and gifts.

How to read the table

Only open-market purchases and sales are trades the insider chose to make at the market price, and they are the ones counted in the summary above. Grants, option exercises and shares withheld for tax come from pay plans. A sale marked as a 10b5-1 plan was scheduled in advance under a written plan.

Where each row comes from

From the Form 4 that each executive, director or large shareholder must file with the SEC within two business days of a transaction, read up to 10 November 2026. Each row links to its filing on EDGAR. Only transactions in shares are listed, not derivatives, and amended filings are left out. The accounts of the company are on the NPK International page; the method, in data sources.

Information prepared from the Form 4 filings submitted to the SEC, for information purposes only. It is not financial advice or a recommendation to buy or sell. Updated on 12 November 2026.