NPK International Inc. - Officer Stock Sale

Gregg Piontek, Senior Vice President and CFO of NPK International Inc., reported the sale of 15,000 shares of common stock on April 9, 2026. The sale was executed automatically under a Rule 10b5-1 trading plan adopted on December 3, 2025. The shares were sold on the open market at a weighted average price of $15.045 per share, with actual prices ranging from $15.00 to $15.10. Following this transaction, Mr. Piontek indirectly holds 65,000 shares by an IRA and 819,326 shares directly. The filing is a Form 4, indicating a transaction by an insider.