NPK International director sells 2,013 shares

NPK International Inc. director Lewis Michael A reported an open-market sale of 2,013 shares of Common Stock at a weighted average price of $15.3017 per share on May 15, 2026.

Rhea-AI Filing Summary

NPK International Inc. director Lewis Michael A reported an open-market sale of 2,013 shares of Common Stock at a weighted average price of $15.3017 per share on May 15, 2026. The sale was executed automatically under a Rule 10b5-1 trading plan adopted on March 7, 2025, and he held 129,320 shares afterward.

Insider Trade Summary 10b5-1

Net Seller: 2,013 shares

Net Sell 1 txn

Insider Lewis Michael A

Role Director

Sold 2,013 shs ($31K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,013	$15.3017	$31K

Holdings After Transaction: Common Stock — 129,320 shares (Direct)

Footnotes (2)

1. F1. 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. F2. The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $15.21 to $15.54, 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.

Key Figures

Shares sold: 2,013 shares Weighted average sale price: $15.3017 per share Post-transaction holdings: 129,320 shares +1 more

4 metrics

Shares sold 2,013 shares Open-market sale on May 15, 2026

Weighted average sale price $15.3017 per share Common Stock sale

Post-transaction holdings 129,320 shares Shares directly owned after sale

Price range of trades $15.21–$15.54 per share Multiple open-market transactions

Key Terms

Rule 10b5-1 trading plan, weighted average price, open market, Form 4

4 terms

Rule 10b5-1 trading plan regulatory

"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."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported is the weighted average price. These shares were sold in multiple transactions in the open market..."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market financial

"These shares were sold in multiple transactions in the open market at prices ranging from $15.21 to $15.54, inclusive."

An open market is a system where buying and selling of goods, services, or financial assets happen freely without restrictions or special controls. For investors, it means they can trade assets easily and quickly, which helps determine fair prices based on supply and demand. This environment encourages transparency and competition, making it easier to buy or sell with confidence.

Form 4 regulatory

"within the range set forth in footnote (2) to this Form 4."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What insider transaction did NPK International (NPKI) report on this Form 4?

NPK International reported that director Lewis Michael A sold 2,013 shares of Common Stock in an open-market transaction at a weighted average price of $15.3017 per share, leaving him with 129,320 shares directly owned after the sale.

At what price did the NPK International (NPKI) director sell shares?

The director sold 2,013 shares at a weighted average price of $15.3017 per share. According to the disclosure, individual trades occurred in the open market at prices ranging from $15.21 to $15.54 per share, inclusive, across multiple transactions.

How many NPK International (NPKI) shares does the director hold after the sale?

Following the reported sale, director Lewis Michael A directly holds 129,320 shares of NPK International Common Stock. This figure reflects his position after disposing of 2,013 shares in the open market under the disclosed trading plan.

Was the NPK International (NPKI) insider sale made under a Rule 10b5-1 plan?

Yes. The filing states the 2,013-share sale occurred automatically under a Rule 10b5-1 trading plan adopted by the reporting person on March 7, 2025, indicating the trades were pre-arranged rather than opportunistic discretionary sales.

What does the price range in the NPK International (NPKI) Form 4 represent?

The filing notes that shares were sold at prices between $15.21 and $15.54. The reported $15.3017 figure is a weighted average, and the reporting person offers to provide detailed trade-by-trade pricing information upon request to investors or regulators.

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

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Accepted by SEC EDGAR 05/19/2026 - 06:11 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).

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 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)
05/15/2026

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	05/15/2026		S		2,013(1)	D	$15.3017(2)	129,320	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 $15.21 to $15.54, 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	05/19/2026
	** 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)