NPK International (NPKI) director executes 2,013-share 10b5-1 sale

Rhea-AI Filing Summary

NPK International Inc. director Lewis Michael A reported an open-market sale of 2,013 shares of common stock on February 23, 2026. The shares were sold at a weighted average price of $14.3052 per share under a pre-arranged Rule 10b5-1 trading plan. After this transaction, he directly held 131,333 shares of NPK International common stock.

Insider Trade Summary

Net Seller: 2,013 shares ($28,796)

Net Sell 1 txn

Insider Lewis Michael A

Role Director

Sold 2,013 shs ($29K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,013	$14.3052	$29K

Holdings After Transaction: Common Stock — 131,333 shares (Direct)

Footnotes (1)

1. The reported sale of 2,013 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 7, 2025. The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.11 to $14.43, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

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).

X

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 TX 77381

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
02/23/2026

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

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

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

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	02/23/2026		S		2,013(1)	D	$14.3052(2)	131,333	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 reported sale of 2,013 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 7, 2025.

2. The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.11 to $14.43, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

	By: M. Celeste Fruge For: Michael A. Lewis	02/25/2026
	** 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.

FAQ

What insider transaction did NPKI director Lewis Michael A report?

Director Lewis Michael A reported selling 2,013 shares of NPK International Inc. common stock. The transaction occurred on February 23, 2026 as an open-market sale under a Rule 10b5-1 trading plan, according to the Form 4 filing disclosures.

At what price were the NPKI shares sold in the latest Form 4?

The 2,013 NPKI shares were sold at a weighted average price of $14.3052 per share. Footnotes explain the sale involved multiple trades between $14.11 and $14.43 in the open market, resulting in the reported average transaction price.

How many NPKI shares does Lewis Michael A hold after this transaction?

After the reported sale, Lewis Michael A directly holds 131,333 shares of NPK International Inc. common stock. This post-transaction balance reflects his remaining direct ownership as disclosed in the Form 4 filed with the Securities and Exchange Commission.

Was the NPKI insider sale made under a Rule 10b5-1 plan?

Yes. The Form 4 states the 2,013-share sale occurred automatically under a Rule 10b5-1 trading plan. The plan was adopted by the reporting person on March 7, 2025, and governed the execution of this transaction in the open market.

What trading range applied to the recent NPKI insider share sale?

The filing notes that the shares were sold in multiple transactions at prices ranging from $14.11 to $14.43 per share. The reported $14.3052 figure is a weighted average price, summarizing all individual trades within that disclosed range.