M. Celeste Fruge - 01 Jun 2026 Form 4 Insider Report for NPK International Inc. (NPKI)

Reporting relationship: VP, General Counsel
Issuer ticker: NPKI
Reported as of: 01 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 03 Jun 2026, 18:56:29 UTC
Prior SEC filing: 21 May 2026
Source filing: View source filing
Reporting owner signature: M. Celeste Fruge

Key filing fact

M. Celeste Fruge filed Form 4 for NPK International Inc. (NPKI) on 03 Jun 2026.

Key facts

This page summarizes M. Celeste Fruge's Form 4 filing for NPK International Inc. (NPKI).
5 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 03 Jun 2026, 18:56.

Change

Previous filing in this sequence was filed on 21 May 2026.
Current net transaction value: $0.

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 0001975485 Primary reporting owner

Fruge Mary Celeste

Relationship: VP, General Counsel
Address: 9320 LAKESIDE BOULEVARD, SUITE 100, THE WOODLANDS
Signature: M. Celeste Fruge
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: -3,833
Change %: -1.4%
Price: $14.31^*
Shares after: 279,382
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1

NPKI transaction

Common Stock

Tax liability

Transaction value
Shares: -5,218
Change %: -1.9%
Price: $14.31^*
Shares after: 274,164
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1

NPKI transaction

Common Stock

Tax liability

Transaction value
Shares: -6,797
Change %: -2.5%
Price: $14.31^*
Shares after: 267,367
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1

NPKI transaction

Common Stock

Options Exercise

Transaction value
Shares: +17,274
Change %: +6.5%
Price: $0.000000^*
Shares after: 284,641
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F2

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: -17,274
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 01 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 17,274
Exercise price: $0.000000
Footnotes: F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 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

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