M. Celeste Fruge - 16 Mar 2026 Form 4 Insider Report for NPK International Inc. (NPKI)

Signature
M. Celeste Fruge
Issuer symbol
NPKI
Transactions as of
16 Mar 2026
Net transactions value
-$13,560
Form type
4
Filing time
18 Mar 2026, 16:35:48 UTC
Previous filing
10 Mar 2026

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Fruge Mary Celeste VP, General Counsel 9320 LAKESIDE BOULEVARD, SUITE 100, THE WOODLANDS M. Celeste Fruge 18 Mar 2026 0001975485

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction NPKI Common Stock Options Exercise +1,000 +0.38% $4.32* 266,213 16 Mar 2026 Direct F1
transaction NPKI Common Stock Sale $13,560 -1,000 -0.38% $13.56 265,213 16 Mar 2026 Direct F1, F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction NPKI Non-Qualified Stock Option (right to buy) Options Exercise -1,000 -100% $0.000000* 0 16 Mar 2026 Common Stock 1,000 $4.32 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 The reported exercise of 1,000 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.
F2 These options were sold on the open market at price stated. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of options sold.