NPK International VP exercises options, sells 1,000 shares

NPK International Inc. vice president and general counsel Mary Celeste Fruge exercised options for 1,000 shares of common stock at $4.32 per share and immediately sold the 1,000 shares in an open-market transaction at $13.56 per share.

Rhea-AI Filing Summary

NPK International Inc. vice president and general counsel Mary Celeste Fruge exercised options for 1,000 shares of common stock at $4.32 per share and immediately sold the 1,000 shares in an open-market transaction at $13.56 per share. After these transactions, she directly holds 265,213 common shares. The exercise and sale were carried out automatically under a pre-arranged Rule 10b5-1 trading plan adopted on December 5, 2025, indicating a scheduled liquidity event rather than a discretionary trade.

Insider Trade Summary 10b5-1

Exercise and Sale: 1,000 shares ($9K approx. pre-tax spread)

Exercise and Sale 3 txns

Insider Fruge Mary Celeste

Role VP, General Counsel

Sold 1,000 shs ($14K)

Approx. gross sale proceeds $14K

Approx. exercise cost $4K

Approx. pre-tax spread $9K

Type	Security	Shares	Price	Value
Exercise	Non-Qualified Stock Option (right to buy)	1,000	$0.00	$0.00
Exercise	Common Stock	1,000	$4.32	$4K
Sale	Common Stock	1,000	$13.56	$14K

Holdings After Transaction: Non-Qualified Stock Option (right to buy) — 0 contracts (Direct); Common Stock — 265,213 shares (Direct)

Footnotes (2)

1. F1. The reported exercise of 1,000 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.
2. F2. These options were sold on the open market at price stated. 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 options sold.

FAQ

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

What insider transaction did NPKI executive Mary Celeste Fruge report?

Mary Celeste Fruge reported exercising 1,000 stock options and selling 1,000 shares of NPK International common stock. The options were exercised at $4.32 per share and the resulting shares were sold in the open market at $13.56 per share.

How many NPKI shares did the executive sell and at what price?

The executive sold 1,000 shares of NPK International common stock at $13.56 per share. These shares came directly from exercising 1,000 non-qualified stock options with a strike price of $4.32 per share on the same date.

How many NPKI shares does Mary Celeste Fruge own after this Form 4 filing?

After the reported transactions, Mary Celeste Fruge directly owns 265,213 shares of NPK International common stock. This reflects her position following the exercise of 1,000 options and the open-market sale of the 1,000 shares acquired through that option exercise.

Were the NPKI insider transactions made under a Rule 10b5-1 trading plan?

Yes. The filing states the 1,000-option exercise and subsequent sale occurred automatically under a Rule 10b5-1 trading plan. That plan was adopted by the reporting person on December 5, 2025, indicating the trades were pre-scheduled rather than timed discretionarily.

What type of derivative security did the NPKI executive exercise?

The executive exercised a non-qualified stock option covering 1,000 underlying shares of NPK International common stock. The options had an exercise price of $4.32 per share and an expiration date of May 19, 2026, and were fully exercised in this transaction.

Does this NPKI Form 4 indicate any remaining options from this grant?

The filing shows 1,000 options exercised with zero derivative shares reported as remaining from that option position. Combined with the empty derivative holdings summary, this indicates the specific 1,000-share non-qualified stock option grant was fully exercised in this event.

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

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Accepted by SEC EDGAR 03/18/2026 - 04:35 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^*

Fruge Mary Celeste

(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)
	VP, General Counsel

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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	03/16/2026		M		1,000(1)	A	$4.32	266,213	D
Common Stock	03/16/2026		S		1,000(1)	D	$13.56(2)	265,213	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
Non-Qualified Stock Option (right to buy)	$4.32	03/16/2026		M			1,000(1)	06/01/2019	05/19/2026	Common Stock	1,000	$0.0	0	D

Explanation of Responses:

1. The reported exercise of 1,000 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.

2. These options were sold on the open market at price stated. 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 options sold.

	M. Celeste Fruge	03/18/2026
	** 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)