NPK International (NPKI) director sale under 10b5-1 plan

Rhea-AI Filing Summary

NPK International Inc. (NPKI) director Lewis Michael A reported selling 2,013 shares of common stock on August 17, 2026 at a weighted average price of $14.2599 per share. The transaction was executed automatically under a Rule 10b5-1 trading plan adopted on March 7, 2025, and left him holding 135,865 shares directly.

Insider Trade Summary 10b5-1

Net Seller: 2,013 shares

Net Sell 1 txn

Insider Lewis Michael A

Role Director

Sold 2,013 shs ($29K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	2,013	$14.2599	$29K

Holdings After Transaction: Common Stock — 135,865 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 $14.15 to $14.40, 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: $14.2599 per share Shares owned after transaction: 135,865 shares +2 more

5 metrics

Shares sold 2,013 shares Common stock sold on August 17, 2026 in a code S transaction

Weighted average sale price $14.2599 per share Weighted average for multiple open-market sales ranging from $14.15 to $14.40

Shares owned after transaction 135,865 shares Directly owned NPK International Inc. common stock following the sale

Net shares sold 2,013 shares Net sell volume across all reported transactions in this Form 4

Rule 10b5-1 plan adoption date March 7, 2025 Date the reporting person adopted the trading plan used for this sale

Key Terms

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

4 terms

Rule 10b5-1 trading plan regulatory

"occurred automatically pursuant to a Rule 10b5-1 trading plan adopted"

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."

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 market

"sold in multiple transactions in the open market at prices"

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

"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

What insider transaction did NPKI director Lewis Michael A report?

Director Lewis Michael A reported a sale of 2,013 NPKI common shares on August 17, 2026 at a weighted average price of $14.2599 per share, executed as part of a pre-arranged Rule 10b5-1 trading plan.

How many NPKI shares does Lewis Michael A own after this Form 4 transaction?

After the reported sale, Lewis Michael A directly owns 135,865 shares of NPK International Inc. common stock. This figure reflects his post-transaction holding as reported in the Form 4 filing.

At what price were the NPKI shares sold in the reported transaction?

The shares were sold at a weighted average price of $14.2599 per share. According to the disclosure, the trades occurred in multiple open-market transactions at prices ranging from $14.15 to $14.40 per share.

Was the NPKI insider sale by Lewis Michael A under a Rule 10b5-1 plan?

Yes. The reported sale of 2,013 NPKI shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by Lewis Michael A on March 7, 2025, indicating it was pre-arranged.

How many NPKI shares did Lewis Michael A sell in this Form 4 filing?

He sold 2,013 shares of NPK International Inc. common stock. The sale was reported as a code “S” open-market or private transaction and left his direct ownership at 135,865 shares.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/19/2026 - 04:15 PM Accepted by SEC EDGAR 08/19/2026 - 04:14 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).

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)
08/17/2026

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	08/17/2026		S		2,013(1)	D	$14.2599(2)	135,865	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 $14.15 to $14.40, 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	08/19/2026
	** 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)