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NPK International Inc.

NPKI
Exchange
NYSE
Industry
Services-Miscellaneous Equipment Rental & Leasing
SEC CIK
0000071829

In the last 90 days, NPK International Inc. insiders filed 0 open-market purchases and 3 sales; 256 institutions reported holding it in 13F filings for Q2 2026, worth $1.25B in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by NPK International Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
3 filings
3 insiders, $203.7K in total
Insiders trading
3
Net value
−$203.7K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for NPK International Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for NPK International Inc.
NameTitleLast reported holdingLast filingFilings, past year
Barton III Alvin JamesEVP Commercial Growth & Ops.12,850Sep 24, 20261
Warren Matthew JamesChief Accounting Officer51,439Sep 10, 20261
Robeson Rose MDirector215,147Aug 31, 20262
Lewis Michael ADirector135,865Aug 19, 20265
Pederson Kristen J.Director6,614Jul 29, 20261
Briggs LoriVP & President, Ind. Solutions247,165Jun 9, 20264
Lanigan MatthewPresident & CEO254,699Jun 5, 20264
Piontek GreggSenior Vice President and CFO858,182Jun 3, 20266
Fruge Mary CelesteVP, General Counsel284,641Jun 3, 20265
Larson Roderick A.Director23,655May 21, 20261
Cutillo Joseph ADirector36,155May 21, 20261
Minge John CDirector253,942May 21, 20261
Meer Claudia MichelDirector126,693May 21, 20261
White Douglas LVP, CAO & Treasurer305,245Jun 17, 20250
Young Donald WinDirector310,940May 19, 20250
Paterson David AVP & President, Fluids Systems386,245Jun 4, 20240
Earle Edward ChipmanVP, General Counsel, CAO230,265Dec 16, 20220
Best Anthony JamesDirector237,809May 20, 20220
Howes Paul LPresident & CEO1,236,325Aug 27, 20210

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 10, 2026 (view filing)6:22 PM ETSep 91 dayWarren Matthew JamesChief Accounting OfficerSSale−2.99K$13.41−$40.1K−5.5%51.4K after10b5-1
Aug 31, 2026 (view filing)4:28 PM ETAug 274 daysRobeson Rose MDirectorSSale−10.0K$13.49−$134.9K−4.4%215.1K after10b5-1
Aug 19, 2026 (view filing)4:14 PM ETAug 172 daysLewis Michael ADirectorSSale−2.01K$14.26−$28.7K−1.5%135.9K after10b5-1
Jun 9, 2026 (view filing)Jun 81 dayBriggs LoriVP & President, Ind. SolutionsSSale−8.32K$14.75−$122.8K−3.3%247.2K after10b5-1
Jun 5, 2026 (view filing)Jun 32 daysLanigan MatthewPresident & CEOSSale−167.4K$14.43−$2.42M−39.7%254.7K after10b5-1
Jun 3, 2026 (view filing)Jun 21 dayBriggs LoriVP & President, Ind. SolutionsSSale−10.4K$14.58−$152.3K−3.9%255.5K after10b5-1
May 19, 2026 (view filing)May 154 daysLewis Michael ADirectorSSale−2.01K$15.30−$30.8K−1.5%129.3K after10b5-1
Apr 10, 2026 (view filing)Apr 91 dayPiontek GreggSenior Vice President and CFOSSale−15.0K$15.05−$225.8K−1.8%819.3K after10b5-1
Apr 3, 2026 (view filing)Apr 12 daysPiontek GreggSenior Vice President and CFOSSale−35.0K$14.51−$507.9K−4.0%834.3K after10b5-1
Mar 26, 2026 (view filing)Mar 251 dayPiontek GreggSenior Vice President and CFOSSale−15.0K$15.03−$225.4K−1.7%869.3K after10b5-1
Mar 18, 2026 (view filing)Mar 162 daysFruge Mary CelesteVP, General CounselSSale−1.00K$13.56−$13.6K−0.4%265.2K after10b5-1
Mar 10, 2026 (view filing)Mar 64 daysFruge Mary CelesteVP, General CounselSSale−11.2K$13.34−$149.3K−4.0%265.2K after10b5-1
Mar 5, 2026 (view filing)Mar 41 dayPiontek GreggSenior Vice President and CFOSSale−108.6K$14.07−$1.53M−10.9%884.3K after2 lots10b5-1
Feb 25, 2026 (view filing)Feb 232 daysLewis Michael ADirectorSSale−2.01K$14.31−$28.8K−1.5%131.3K after10b5-1
Nov 25, 2025 (view filing)Nov 241 dayLewis Michael ADirectorSSale−2.01K$12.00−$24.2K−1.5%133.3K after10b5-1
Oct 3, 2025 (view filing)Oct 12 daysBriggs LoriVP & President, Ind. SolutionsSSale−10.1K$11.51−$116.3K−4.0%242.5K after10b5-1
Sep 4, 2025 (view filing)Sep 31 dayLanigan MatthewPresident & CEOSSale−1.00K$10.38−$10.4K−0.1%1.10M after10b5-1
Aug 26, 2025 (view filing)Aug 251 dayLewis Michael ADirectorSSale−2.01K$10.33−$20.8K−1.5%135.4K after10b5-1
Aug 26, 2025 (view filing)Aug 224 daysLanigan MatthewPresident & CEOSSale−68.9K$10.34−$712.4K−5.9%1.10M after10b5-1
Aug 12, 2025 (view filing)Aug 111 dayBriggs LoriVP & President, Ind. SolutionsSSale−8.01K$9.51−$76.1K−3.1%252.6K after10b5-1
Jul 10, 2025 (view filing)Jul 91 dayBriggs LoriVP & President, Ind. SolutionsSSale−8.01K$8.57−$68.6K−3.0%260.6K after10b5-1
Jun 17, 2025 (view filing)Jun 161 dayLewis Michael ADirectorSSale−2.01K$8.60−$17.3K−1.4%137.4K after10b5-1
Jun 10, 2025 (view filing)Jun 64 daysBriggs LoriVP & President, Ind. SolutionsSSale−9.70K$8.38−$81.3K−3.5%268.6K after10b5-1
May 20, 2025 (view filing)May 191 dayMeer Claudia MichelDirectorPPurchase+4.00K$7.92+$31.7K+3.5%118.1K after
May 8, 2025 (view filing)May 8Same dayCutillo Joseph ADirectorPPurchase+12.5K$8.00+$100.0KNew position12.5K after
Mar 6, 2025 (view filing)Mar 51 dayMinge John CDirectorPPurchase+10.0K$5.38+$53.8K+4.5%230.3K after
Aug 22, 2023 (view filing)Aug 211 dayMeer Claudia MichelDirectorPPurchase+1.30K$5.57+$7.24K+1.6%82.9K after
Aug 17, 2023 (view filing)Aug 161 dayMeer Claudia MichelDirectorPPurchase+8.00K$5.27+$42.2K+10.9%81.6K after
Mar 17, 2023 (view filing)Mar 152 daysMinge John CDirectorPPurchase+10.0K$4.03+$40.3K+6.2%172.0K after2 lots
Dec 12, 2022 (view filing)Dec 93 daysLewis Michael ADirectorPPurchase+5.25K$3.98+$20.9K+7.4%76.0K after
Nov 21, 2022 (view filing)Nov 21Same dayYoung Donald WinDirectorPPurchase+30.0K$3.94+$118.2K+13.8%247.6K after
Nov 21, 2022 (view filing)Nov 21Same dayMinge John CDirectorPPurchase+5.00K$3.64+$18.2K+3.2%162.0K after
Nov 18, 2022 (view filing)Nov 16-182 daysMeer Claudia MichelDirectorPPurchase+5.00K$3.96+$19.8K+13.7%41.5K after2 lots
Nov 14, 2022 (view filing)Nov 104 daysMinge John CDirectorPPurchase+5.00K$3.95+$19.8K+3.3%157.0K after
Aug 19, 2022 (view filing)Aug 181 dayYoung Donald WinDirectorPPurchase+3.80K$2.91+$11.1K+1.8%217.6K after
Aug 17, 2022 (view filing)Aug 15-172 daysYoung Donald WinDirectorPPurchase+89.6K$2.67+$239.5K+72.1%213.8K after3 lots
Aug 17, 2022 (view filing)Aug 161 dayMinge John CDirectorPPurchase+15.0K$2.66+$39.9K+10.9%152.0K after
Aug 9, 2022 (view filing)Aug 54 daysPiontek GreggSenior Vice President and CFOPPurchase+10.0K$2.55+$25.5K+18.2%65.0K after
Aug 9, 2022 (view filing)Aug 54 daysLanigan MatthewPresident & CEOPPurchase+19.0K$2.55+$48.5K+7.4%277.2K after
Aug 9, 2022 (view filing)Aug 54 daysEarle Edward ChipmanVP, General Counsel, CAOPPurchase+10.0K$2.56+$25.6K+4.6%228.3K after
May 16, 2022 (view filing)May 124 daysYoung Donald WinDirectorPPurchase+19.3K$3.54+$68.2K+28.1%87.7K after
May 10, 2022 (view filing)May 6-94 daysYoung Donald WinDirectorPPurchase+68.5K$3.55+$243.0KNew position68.5K after2 lots
Aug 27, 2021 (view filing)Aug 261 dayHowes Paul LPresident & CEOPPurchase+30.0K$2.29+$68.7K+2.5%1.24M after