• NPK International officer Lori Briggs, VP and President, Industrial Solutions, reported a net decrease in common stock ownership.
• Sold 10,446 shares on June 2 at a weighted average price of $14.58.
• Also reported June 1 transactions tied to restricted stock units, including 24,340 shares acquired on conversion.
• Holdings stood at 255,490 common shares following the reported transactions.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. NPK International Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001880836-26-000004), on June 03, 2026, and is solely responsible for the information contained therein.