NPK International CFO granted 34,566 RSUs

Piontek Gregg reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Piontek Gregg reported acquisition or exercise transactions in this Form 4 filing.

NPK International Inc. reported that Senior Vice President and CFO Gregg Piontek received a grant of restricted stock units covering 34,566 shares of common stock. The award was granted at no cash cost per share and is a form of equity compensation rather than an open‑market purchase.

According to the terms, these restricted stock units vest in one-third increments on June 1 of each subsequent year after grant and will settle in shares of common stock. Following this grant, Piontek directly holds 853,892 shares, and a separate entry shows 65,000 shares of common stock held indirectly through an IRA and trust.

Insider Trade Summary

Grant/Award: 34,566 shares

Grant/Award 2 txns

Insider Piontek Gregg

Role Senior Vice President and CFO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	34,566	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 853,892 shares (Direct); Common Stock — 65,000 shares (Indirect, by IRA)

Footnotes (2)

1. F1. Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.
2. F2. These shares are indirectly held by Trust.

Key Figures

RSU grant size: 34,566 shares Grant price: $0.0000 per share Direct holdings after grant: 853,892 shares +1 more

4 metrics

RSU grant size 34,566 shares Restricted stock units of common stock granted to CFO

Grant price $0.0000 per share Stated price per share for the RSU grant

Direct holdings after grant 853,892 shares Common stock directly owned by Gregg Piontek after transaction

Indirect IRA holdings 65,000 shares Common stock held indirectly by IRA and trust

Key Terms

restricted stock units, IRA, indirectly held, grant, award, or other acquisition

4 terms

restricted stock units financial

"Grant of restricted stock units that vest in one-third increments on June 1"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

IRA financial

"These shares are indirectly held by Trust and reported as by IRA"

An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

indirectly held financial

"These shares are indirectly held by Trust."

grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did NPKI report for CFO Gregg Piontek?

NPK International reported an equity grant to CFO Gregg Piontek. He received 34,566 restricted stock units of common stock as compensation, not an open‑market purchase. The grant increases his equity stake and will vest over time according to the disclosed vesting schedule.

How many NPKI shares does CFO Gregg Piontek hold after this Form 4?

After the reported transactions, Gregg Piontek holds 853,892 shares directly. The filing also lists a separate holding entry of 65,000 common shares held indirectly through an IRA and trust, indicating both direct and indirect ownership positions in NPK International.

How do the NPKI restricted stock units granted to the CFO vest?

The restricted stock units vest in stages after the grant date. The award vests in one-third increments on June 1 of each subsequent year after grant and will settle in shares of common stock as the vesting conditions are satisfied.

Was the NPKI CFO’s Form 4 transaction a market buy or sell?

The Form 4 does not show any open‑market buys or sells. The main transaction is a grant of 34,566 restricted stock units at a price of $0.0000 per share, reflecting equity compensation rather than a cash purchase or sale of existing shares.

What does indirect ownership by IRA and trust mean in the NPKI filing?

Indirect ownership indicates shares are held through another entity. The Form 4 shows 65,000 common shares held indirectly by an IRA and trust, meaning the position is associated with the reporting person but held in these vehicles rather than directly in his name.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/21/2026 - 05:08 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

Piontek Gregg

(Last) (First) (Middle)

9320 LAKESIDE BOULEVARD

SUITE 100

(Street)

THE WOODLANDS TEXAS 77381

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
NPK International Inc. [ NPKI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Senior Vice President and CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/19/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/19/2026		A		34,566(1)	A	$0.0	853,892	D
Common Stock								65,000	I	by IRA(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

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

2. These shares are indirectly held by Trust.

	By: M. Celeste Fruge For: Gregg S. Piontek	05/21/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)