Lori Briggs - 01 Jun 2026 Form 4 Insider Report for NPK International Inc. (NPKI)

Reporting relationship: VP & President, Ind. Solutions
Issuer ticker: NPKI
Reported as of: 01 Jun 2026
Net transaction value: -$152,278
SEC form: 4
Accepted by SEC: 03 Jun 2026, 18:51:45 UTC
Prior SEC filing: 21 May 2026
Next SEC filing: 09 Jun 2026
Source filing: View source filing
Reporting owner signature: By: M. Celeste Fruge For: Lori Briggs

Key filing fact

Lori Briggs filed Form 4 for NPK International Inc. (NPKI) on 03 Jun 2026.

Key facts

This page summarizes Lori Briggs's Form 4 filing for NPK International Inc. (NPKI).
6 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 03 Jun 2026, 18:51.

Change

Previous filing in this sequence was filed on 21 May 2026.
Current net transaction value: -$152,278.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001880836 Primary reporting owner

Briggs Lori

Relationship: VP & President, Ind. Solutions
Address: 9320 LAKESIDE BOULEVARD, SUITE 100, THE WOODLANDS
Signature: By: M. Celeste Fruge For: Lori Briggs
Signature date: 03 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

NPKI transaction

Common Stock

Tax liability

Transaction value
Shares: -5,401
Change %: -2.1%
Price: $14.31^*
Shares after: 257,950
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1

NPKI transaction

Common Stock

Tax liability

Transaction value
Shares: -9,577
Change %: -3.7%
Price: $14.31^*
Shares after: 248,373
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1

NPKI transaction

Common Stock

Tax liability

Transaction value
Shares: -6,777
Change %: -2.7%
Price: $14.31^*
Shares after: 241,596
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1

NPKI transaction

Common Stock

Options Exercise

Transaction value
Shares: +24,340
Change %: +10%
Price: $0.000000^*
Shares after: 265,936
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F2

NPKI transaction

Common Stock

Sale

Transaction value: $152,278
Shares: -10,446
Change %: -3.9%
Price: $14.58
Shares after: 255,490
Date: 02 Jun 2026
Ownership: Direct
Footnotes: F3, F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

NPKI transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -24,340
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 01 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 24,340
Exercise price: $0.000000
Footnotes: F2, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 5 footnotes

Footnote F1

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

Footnote F2

The restricted stock units vest and convert into shares on a one-for-one basis.

Footnote F3

The reported sale of 10,446 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 15, 2025.

Footnote F4

The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.33 to $14.74, 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.

Footnote F5

Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.