Gregg S. Piontek - 04 Mar 2026 Form 4 Insider Report for NPK International Inc. (NPKI)

Role
Senior Vice President and CFO
Signature
By: M. Celeste Fruge For: Gregg S. Piontek
Issuer symbol
NPKI
Transactions as of
04 Mar 2026
Net transactions value
-$1,528,056
Form type
4
Filing time
05 Mar 2026, 17:50:16 UTC
Previous filing
03 Jun 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Piontek Gregg Senior Vice President and CFO 9320 LAKESIDE BOULEVARD, SUITE 100, THE WOODLANDS By: M. Celeste Fruge For: Gregg S. Piontek 05 Mar 2026 0001418328

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction NPKI Common Stock Options Exercise +73,590 +8% $4.32* 992,916 04 Mar 2026 Direct F1
transaction NPKI Common Stock Sale $1,037,464 -73,590 -7.4% $14.10 919,326 04 Mar 2026 Direct F1, F2
transaction NPKI Common Stock Sale $490,592 -35,000 -3.8% $14.02 884,326 04 Mar 2026 Direct F3, F4
holding NPKI Common Stock 65,000 04 Mar 2026 by IRA F5

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 -73,590 -100% $0.000000* 0 04 Mar 2026 Common Stock 73,590 $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 73,590 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 3, 2025.
F2 The price reported is the weighted average price. These options were sold in multiple transactions in the open market at prices ranging from $14.00 to $14.31, inclusive. 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 at each separate price within the range set forth in footnote (2) to this Form 4.
F3 The reported sale of 35,000 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2025.
F4 The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $13.68 to $14.31, inclusive. 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 shares sold at each separate price within the range set forth in footnote (2) to this Form 4.
F5 These shares are indirectly held by Trust.