NPK International (NPKI) CEO receives 85,771-share restricted stock grant

Rhea-AI Filing Summary

LANIGAN MATTHEW reported acquisition or exercise transactions in this Form 4 filing.

NPK International Inc. reported that President & CEO Matthew Lanigan received a grant of 85,771 shares of common stock as a restricted stock unit award at a price of $0.0000 per share. These restricted stock units vest in one-third increments on June 1 of each subsequent year after the grant and settle in shares. Following this award, Lanigan directly holds 411,435 common shares, and an additional 770,249 common shares are held indirectly by a trust.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider LANIGAN MATTHEW

Role President & CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	85,771	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 411,435 shares (Direct, null); Common Stock — 770,249 shares (Indirect, by Trust)

Footnotes (1)

1. [object Object]

Key Figures

RSU grant size: 85,771 shares Grant price: $0.0000 per share Direct holdings after grant: 411,435 shares +1 more

4 metrics

RSU grant size 85,771 shares Restricted stock units granted to CEO on 2026-05-19

Grant price $0.0000 per share Recorded price for RSU grant

Direct holdings after grant 411,435 shares CEO direct common stock ownership after transaction

Indirect trust holdings 770,249 shares Common stock held indirectly by trust

Key Terms

restricted stock units, grant/award acquisition, indirect ownership, by Trust

4 terms

restricted stock units financial

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

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.

grant/award acquisition financial

"transaction_action": "grant/award acquisition""

indirect ownership financial

""ownership_type": "indirect""

by Trust financial

""nature_of_ownership": "by Trust""

Form 4 Insider Transactions: What Each Field Means →

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^*

LANIGAN MATTHEW

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

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		85,771(1)	A	$0.0	411,435	D
Common Stock								770,249	I	by Trust

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.

	By: M. Celeste Fruge For: Matthew Lanigan	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)

FAQ

What insider transaction did NPKI report for CEO Matthew Lanigan?

NPK International reported that CEO Matthew Lanigan received a grant of 85,771 restricted stock units of common stock. The award was recorded at a price of $0.0000 per share and represents equity-based compensation rather than an open-market purchase or sale.

How do the 85,771 NPKI restricted stock units for the CEO vest?

The 85,771 restricted stock units granted to NPK International’s CEO vest in one-third increments on June 1 of each subsequent year after the grant. Once vested, the units settle in shares of common stock according to the award terms.

What are Matthew Lanigan’s direct NPKI share holdings after this Form 4?

After the reported grant, CEO Matthew Lanigan directly holds 411,435 shares of NPK International common stock. This figure reflects his direct ownership position following the equity award disclosed in the Form 4 insider transaction report.

How many NPKI shares are held indirectly for the CEO through a trust?

The Form 4 shows 770,249 shares of NPK International common stock held indirectly by a trust. These shares are reported as indirect ownership, indicating they are held through a trust arrangement rather than in the CEO’s direct name.

Was the NPKI CEO transaction an open-market buy or sell of shares?

The filing does not report an open-market buy or sell. Instead, it records a grant of 85,771 restricted stock units as compensation, with no cash price paid, and a separate entry showing indirect holdings by a trust with no transaction shares listed.