NPK International director sells 10,000 shares

NPK International Inc. (NPKI) director Robeson Rose M reported selling 10,000 shares of common stock on 2026-08-27 at a weighted average price of $13.4917 per share in open-market transactions.

Rhea-AI Filing Summary

NPK International Inc. (NPKI) director Robeson Rose M reported selling 10,000 shares of common stock on 2026-08-27 at a weighted average price of $13.4917 per share in open-market transactions. The sale was executed automatically under a Rule 10b5-1 trading plan adopted on May 27, 2026, leaving 215,147 shares held directly.

Insider Trade Summary 10b5-1

Net Seller: 10,000 shares

Net Sell 1 txn

Insider ROBESON ROSE M

Role Director

Sold 10,000 shs ($135K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	10,000	$13.4917	$135K

Holdings After Transaction: Common Stock — 215,147 shares (Direct)

Footnotes (2)

1. F1. The reported sale of 10,000 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 27, 2026.
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 $13.11 to $13.72, 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: 10,000 shares of Common Stock Weighted average sale price: $13.4917 per share Sale price range: $13.11–$13.72 per share +1 more

4 metrics

Shares sold 10,000 shares of Common Stock Non-derivative open-market sale on 2026-08-27

Weighted average sale price $13.4917 per share Average price for 10,000 shares sold on 2026-08-27

Sale price range $13.11–$13.72 per share Range of prices for multiple open-market transactions on 2026-08-27

Shares owned after transaction 215,147 shares Direct holdings of Robeson Rose M after the reported sale

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. These shares were sold"

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 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.

FAQ

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

What insider transaction did NPKI disclose in this Form 4?

NPK International Inc. disclosed that director Robeson Rose M sold 10,000 shares of common stock on 2026-08-27 at a weighted average price of $13.4917 per share in open-market transactions.

How many NPKI shares does the insider hold after this sale?

After the reported sale, director Robeson Rose M holds 215,147 shares of NPK International Inc. common stock directly, as reported in the Form 4.

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

Yes. The Form 4 states that the 10,000-share sale occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 27, 2026.

What price range did the NPKI shares sell for in this transaction?

The filing reports a weighted average price of $13.4917 per share, with the 10,000 shares sold in multiple open-market transactions at prices ranging from $13.11 to $13.72 per share, inclusive.

What does the weighted average price mean in the NPKI Form 4 sale?

For this NPK International Inc. transaction, the $13.4917 figure is a weighted average price across multiple trades between $13.11 and $13.72 per share. The insider offers to provide exact share counts at each price upon request.

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

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Available on EDGAR 08/31/2026 - 04:29 PM EDT Accepted by SEC EDGAR 08/31/2026 - 04:28 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^*

ROBESON ROSE M

(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)
08/27/2026

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	08/27/2026		S		10,000(1)	D	$13.4917(2)	215,147	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 10,000 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 27, 2026.

2. The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $13.11 to $13.72, 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: Rose M. Robeson	08/31/2026
	** 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)