Piontek Gregg 4

4 · NPK International Inc. · Filed Mar 5, 2026

Form 4

Period: 2026-03-04

Senior Vice President and CFO

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-03-04$4.32/sh+73,590$317,909→ 992,916 total
Sale
Common Stock
[F1][F2]
2026-03-04$14.10/sh−73,590$1,037,464→ 919,326 total
Sale
Common Stock
[F3][F4]
2026-03-04$14.02/sh−35,000$490,592→ 884,326 total
Exercise/Conversion
Non-Qualified Stock Option (right to buy)
[F1]
2026-03-04−73,590→ 0 total
Exercise: $4.32From: 2019-06-01Exp: 2026-05-19→ Common Stock (73,590 underlying)

Holdings

Footnotes (5)

[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.

Signature

By: M. Celeste Fruge For: Gregg S. Piontek|2026-03-05

Documents

1 file