Key facts
- This page summarizes Gregg S. Piontek'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, 18:53.
Gregg S. Piontek - 01 Jun 2026 Form 4 Insider Report for NPK International Inc. (NPKI)
- Reporting relationship
- Senior Vice President and CFO
- Issuer ticker
- NPKI
- Reported as of
- 01 Jun 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 03 Jun 2026, 18:53:29 UTC
- Prior SEC filing
- 21 May 2026
- Source filing
- View source filing
- Reporting owner signature
- By: M. Celeste Fruge For: Gregg S. Piontek
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Gregg S. Piontek filed Form 4 for NPK International Inc. (NPKI) on 03 Jun 2026.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001418328
Primary reporting owner
Piontek Gregg
- Relationship
- Senior Vice President and CFO
- Address
- 9320 LAKESIDE BOULEVARD, SUITE 100, THE WOODLANDS
- Signature
- By: M. Celeste Fruge For: Gregg S. Piontek
- 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
- -8,959
- Change %
- -1%
- Price
- $14.31*
- Shares after
- 844,933
- Date
- 01 Jun 2026
- Ownership
- Direct
- Footnotes
- F1
NPKI
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -15,889
- Change %
- -1.9%
- Price
- $14.31*
- Shares after
- 829,044
- Date
- 01 Jun 2026
- Ownership
- Direct
- Footnotes
- F1
NPKI
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -11,241
- Change %
- -1.4%
- Price
- $14.31*
- Shares after
- 817,803
- Date
- 01 Jun 2026
- Ownership
- Direct
- Footnotes
- F1
NPKI
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +40,379
- Change %
- +4.9%
- Price
- $0.000000*
- Shares after
- 858,182
- Date
- 01 Jun 2026
- Ownership
- Direct
- Footnotes
- F2
NPKI
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 65,000
- Date
- 01 Jun 2026
- Ownership
- by IRA
- Footnotes
- F3
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
- -40,379
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 01 Jun 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 40,379
- Exercise price
- $0.000000
- Footnotes
- F2, F4
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 4 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
These shares are indirectly held by Trust.
Footnote F4
Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.