NPK International director granted 8,558 shares

Lewis Michael A reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Lewis Michael A reported acquisition or exercise transactions in this Form 4 filing.

NPK International Inc. director Lewis Michael A received a grant of 8,558 shares of common stock. The grant was at no cash cost per share and increased his direct holdings to 137,878 shares. The shares will vest on the earlier of the first anniversary of the grant date or the day before the next annual stockholders meeting.

Insider Trade Summary

Grant/Award: 8,558 shares

Grant/Award 1 txn

Insider Lewis Michael A

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	8,558	$0.00	$0.00

Holdings After Transaction: Common Stock — 137,878 shares (Direct)

Footnotes (1)

1. F1. The shares will vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual stockholders meeting.

Key Figures

Shares granted: 8,558 shares Grant price: $0.00 per share Total holdings after grant: 137,878 shares +2 more

5 metrics

Shares granted 8,558 shares Common stock grant to director on May 20, 2026

Grant price $0.00 per share Stated price for equity award

Total holdings after grant 137,878 shares Director’s direct common stock ownership after transaction

Transaction type Grant, award, or other acquisition Form 4 transaction code A for common stock

Vesting condition Earlier of 1-year anniversary or pre-annual meeting Time-based vesting for granted shares

Key Terms

Grant, award, or other acquisition, Common Stock, vest, annual stockholders meeting

4 terms

Grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

vest financial

"The shares will vest on the earlier of the first anniversary"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

annual stockholders meeting financial

"or the day prior to the next annual stockholders meeting"

FAQ

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

What insider transaction did NPKI director Lewis Michael A report?

Director Lewis Michael A reported receiving a grant of 8,558 shares of NPK International Inc. common stock. This was a non-cash award classified as a grant, award, or other acquisition, increasing his direct ownership position in the company.

At what price were the NPKI shares granted to the director?

The 8,558 shares of NPK International Inc. common stock were granted at a stated price of $0.00 per share. This indicates a compensation-related stock award rather than an open-market purchase, consistent with typical equity incentive grants to directors.

How many NPKI shares does the director hold after this grant?

Following the grant, Lewis Michael A directly holds 137,878 shares of NPK International Inc. common stock. This total includes the newly granted 8,558 shares and reflects his direct ownership position reported in this Form 4 filing with the SEC.

When do the newly granted NPKI shares vest for the director?

The granted shares vest on the earlier of the first anniversary of the grant date or the day prior to NPK International Inc.’s next annual stockholders meeting. This time-based vesting schedule ties the award to continued board service over that period.

Is the NPKI director’s transaction a market purchase or a compensation grant?

The transaction is a compensation-related grant, described as a "Grant, award, or other acquisition" of 8,558 shares. The $0.00 per-share price and vesting conditions confirm it is an equity award, not an open-market stock purchase by the director.

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

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Accepted by SEC EDGAR 05/21/2026 - 05:16 PM EDT 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^*

Lewis Michael A

(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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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	05/20/2026		A		8,558(1)	A	$0.0	137,878	D

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. The shares will vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual stockholders meeting.

	By: M. Celeste Fruge For: Michael A. Lewis	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)