NPK International CFO exercises RSUs, tax shares

NPK International Inc. Senior Vice President and CFO Gregg Piontek reported routine equity compensation activity involving restricted stock units and related tax withholding.

Rhea-AI Filing Summary

NPK International Inc. Senior Vice President and CFO Gregg Piontek reported routine equity compensation activity involving restricted stock units and related tax withholding. On June 1, 2026, restricted stock units converted on a one-for-one basis into 40,379 shares of common stock. To satisfy tax withholding obligations upon this vesting, a total of 36,089 shares were delivered back at $14.31 per share, which is characterized as tax-withholding dispositions rather than open-market sales. After these transactions, Piontek holds 817,803 common shares directly and 65,000 common shares indirectly through an account, indicating a substantial remaining ownership position.

Insider Trade Summary

40,379 shares exercised/converted

Exercise 6 txns

Insider Piontek Gregg

Role Senior Vice President and CFO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	40,379	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	8,959	$14.31	$128K
Exercise Price or Tax Liability	Common Stock	15,889	$14.31	$227K
Exercise Price or Tax Liability	Common Stock	11,241	$14.31	$161K
Exercise	Common Stock	40,379	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Common Stock — 858,182 shares (Direct); Common Stock — 65,000 shares (Indirect, by IRA)

Footnotes (4)

1. F1. Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.
2. F2. The restricted stock units vest and convert into shares on a one-for-one basis.
3. F3. These shares are indirectly held by Trust.
4. 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.

Key Figures

RSU conversion: 40,379 shares Tax-withholding shares: 36,089 shares Tax-withholding price: $14.31 per share +3 more

6 metrics

RSU conversion 40,379 shares Restricted stock units converting into common stock on June 1, 2026

Tax-withholding shares 36,089 shares Shares delivered to satisfy tax obligations at vesting

Tax-withholding price $14.31 per share Price used for tax-withholding dispositions

Direct holdings after transactions 817,803 shares Common stock directly owned following Form 4 transactions

Indirect holdings 65,000 shares Common stock indirectly owned through an account

Derivative exercises 40,379 shares Exercise/conversion of derivative RSU position into common stock

Key Terms

Restricted Stock Units, tax withholding obligations, one-for-one basis, indirectly held, +1 more

5 terms

Restricted Stock Units financial

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

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.

tax withholding obligations financial

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

one-for-one basis financial

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

indirectly held financial

"These shares are indirectly held by Trust."

Senior Vice President and CFO financial

"Piontek Gregg serves as Senior Vice President and CFO."

FAQ

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

What did NPKI CFO Gregg Piontek report in this Form 4 filing?

CFO Gregg Piontek reported vesting of restricted stock units converting into 40,379 NPKI common shares, along with related tax-withholding share dispositions, leaving him with 817,803 directly held shares and additional indirect ownership through an account.

How many NPKI shares did Gregg Piontek acquire through RSU vesting?

Restricted stock units converted on a one-for-one basis into 40,379 NPKI common shares. This RSU vesting represents equity compensation settling in stock, increasing his gross share position before accounting for tax-withholding dispositions reported in the same filing.

How many NPKI shares were used to cover Gregg Piontek’s tax obligations?

A total of 36,089 NPKI shares were delivered to cover tax withholding obligations tied to RSU vesting, at a reported price of $14.31 per share. These transactions are characterized as tax-withholding dispositions, not open-market sales of stock by the executive.

What is Gregg Piontek’s NPKI share ownership after these transactions?

Following the reported RSU vesting and tax-withholding dispositions, Gregg Piontek directly holds 817,803 NPKI common shares. He also reports 65,000 additional common shares held indirectly through an account, reflecting continued significant equity exposure to the company.

Were any of Gregg Piontek’s NPKI transactions open-market buys or sells?

The filing shows no open-market purchases or sales by Gregg Piontek. Reported activity consists of RSU vesting, derivative exercises, and shares delivered to satisfy tax withholding obligations, which are routine compensation-related events rather than discretionary trading decisions.

How are the indirectly held NPKI shares reported for Gregg Piontek?

The filing lists 65,000 NPKI common shares as indirectly owned by Gregg Piontek through an account, with a footnote indicating they are indirectly held. This structure affects how voting and economic interest are reported but still reflects associated ownership.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 06/03/2026 - 06:53 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)
06/01/2026

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	06/01/2026		F		8,959(1)	D	$14.31	844,933	D
Common Stock	06/01/2026		F		15,889(1)	D	$14.31	829,044	D
Common Stock	06/01/2026		F		11,241(1)	D	$14.31	817,803	D
Common Stock	06/01/2026		M		40,379	A	$0.0(2)	858,182	D
Common Stock								65,000	I	by IRA(3)

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
Restricted Stock Units	$0.0(2)	06/01/2026		M			40,379	(4)	(4)	Common Stock	40,379	$0.0	0	D

Explanation of Responses:

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

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

3. These shares are indirectly held by Trust.

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

	By: M. Celeste Fruge For: Gregg S. Piontek	06/03/2026
	** 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)