NPK International CAO sells 2,991 shares

NPK International’s Chief Accounting Officer reported a Rule 10b5-1–planned sale of 2,991 shares, leaving him with 51,439 shares held directly.

Rhea-AI Filing Summary

NPK International Inc. (NPKI) reported that its Chief Accounting Officer, Warren Matthew James, sold common stock in an open-market transaction. On September 9, 2026, he sold 2,991 shares of common stock at a weighted average price of $13.41 per share, with individual trade prices ranging from $13.33 to $13.51.

The sale was executed automatically under a Rule 10b5-1 trading plan adopted by the officer on December 17, 2025. Following this transaction, he directly holds 51,439 shares of NPK International Inc. common stock.

Insider Trade Summary 10b5-1

Net Seller: 2,991 shares

Net Sell 1 txn

Insider Warren Matthew James

Role Chief Accounting Officer

Sold 2,991 shs ($40K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	2,991	$13.4112	$40K

Holdings After Transaction: Common Stock — 51,439 shares (Direct)

Footnotes (2)

1. F1. The reported sale of 2,991 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 17, 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 $13.33 to $13.51, 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: 2,991 shares Weighted average sale price: $13.4112 per share Sale price range: $13.33–$13.51 per share +3 more

6 metrics

Shares sold 2,991 shares Common stock sale reported for September 9, 2026

Weighted average sale price $13.4112 per share Average price across multiple open-market trades on September 9, 2026

Sale price range $13.33–$13.51 per share Price range for individual trades included in the reported sale

Shares held after transaction 51,439 shares Direct ownership of Chief Accounting Officer after the September 9, 2026 sale

Net shares sold in filing 2,991 shares Net sell activity across all transactions reported in this Form 4

Rule 10b5-1 plan adoption date December 17, 2025 Date the trading plan governing this sale was adopted

Key Terms

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

3 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

"shares were sold in multiple transactions in the open market"

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.

FAQ

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

What insider transaction did NPK International Inc. (NPKI) disclose for its Chief Accounting Officer?

NPK International Inc. disclosed that its Chief Accounting Officer, Warren Matthew James, sold 2,991 shares of common stock on September 9, 2026 in an open-market transaction at a weighted average price of $13.41 per share.

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

The 2,991 NPKI shares were sold at a weighted average price of $13.4112 per share. The filing states the shares were sold in multiple open-market trades at prices ranging from $13.33 to $13.51 per share.

How many NPKI shares does the Chief Accounting Officer hold after this sale?

After the reported sale, the Chief Accounting Officer directly holds 51,439 shares of NPK International Inc. common stock, according to the ownership figure reported following the transaction.

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

Yes. The filing states that the sale of 2,991 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 17, 2025.

What role does the reporting person hold at NPK International Inc. (NPKI)?

The reporting person, Warren Matthew James, serves as the Chief Accounting Officer of NPK International Inc., as identified in the Form 4.

What type of transaction is reported in this NPKI Form 4 filing?

The Form 4 reports a sale of common stock (coded as a sale in the open market or a private transaction) of 2,991 shares by the Chief Accounting Officer on September 9, 2026.

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

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Available on EDGAR 09/10/2026 - 06:23 PM Accepted by SEC EDGAR 09/10/2026 - 06:22 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^*

Warren Matthew James

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/09/2026

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	09/09/2026		S		2,991(1)	D	$13.4112(2)	51,439	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 2,991 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 17, 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 $13.33 to $13.51, 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: Matthew Warren	09/10/2026
	** 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)