Was Matthew Lanigan’s NPKI share sale under a Rule 10b5-1 plan?

Yes. The filing states the 167,375-share sale occurred automatically under a Rule 10b5-1 trading plan adopted on March 4, 2026. Such plans pre-schedule transactions, reducing the significance of short-term market timing in interpreting insider activity.

NPK International (NPKI) CEO sells 167,375 shares under Rule 10b5-1 plan

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

NPK International Inc. President & CEO Matthew Lanigan reported an open-market sale of 167,375 shares of common stock on June 3, 2026 at a weighted average price of $14.4341 per share. The sale was executed automatically under a Rule 10b5-1 trading plan adopted on March 4, 2026, indicating it was pre-scheduled rather than a discretionary trade.

Following the sale, Lanigan directly holds 254,699 shares of common stock and indirectly holds 770,249 shares through a trust. The filing does not show any derivative positions such as options or warrants remaining after this transaction.

Insights

CEO executes pre-planned share sale while retaining sizable holdings.

The Form 4 shows President & CEO Matthew Lanigan sold 167,375 shares of NPK International common stock at a weighted average of $14.4341 on June 3, 2026. The transaction is coded as an open-market sale and described as occurring automatically under a Rule 10b5-1 trading plan adopted on March 4, 2026, which typically indicates a pre-arranged, systematic selling program.

After the sale, Lanigan still owns 254,699 shares directly and 770,249 shares indirectly via a trust, so he maintains a substantial equity stake. There are no remaining derivative positions listed, suggesting this filing reflects only common stock activity. Overall, this looks like a routine liquidity event under a pre-planned arrangement rather than a directional change in insider sentiment.

Insider Trade Summary 10b5-1

Net Seller: 167,375 shares ($2,415,907)

Net Sell 2 txns

Insider LANIGAN MATTHEW

Role President & CEO

Sold 167,375 shs ($2.42M)

Type	Security	Shares	Price	Value
Sale	Common Stock	167,375	$14.4341	$2.42M
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 254,699 shares (Direct, null); Common Stock — 770,249 shares (Indirect, by Trust)

Footnotes (1)

The reported sale of 167,375 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 4, 2026. The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.29 to $14.56, 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: 167,375 shares Weighted average sale price: $14.4341 per share Sale price range: $14.29–$14.56 per share +3 more

6 metrics

Shares sold 167,375 shares Open-market sale on June 3, 2026

Weighted average sale price $14.4341 per share Common stock sale on June 3, 2026

Sale price range $14.29–$14.56 per share Multiple open-market transactions included in the sale

Direct holdings after sale 254,699 shares Common stock directly owned following the transaction

Indirect holdings after sale 770,249 shares Common stock held indirectly by trust

Net buy/sell shares -167,375 shares Net share change from reported transactions

Key Terms

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

5 terms

Rule 10b5-1 trading plan regulatory

"The reported sale of 167,375 shares occurred automatically pursuant to a Rule 10b5-1 trading plan"

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 financial

"These shares were sold in multiple transactions in the open market at prices ranging from $14.29 to $14.56"

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.

indirect financial

"total_shares_following_transaction": "770249.0000" ... "ownership_type": "indirect""

by Trust financial

""direct_or_indirect": "I", "nature_of_ownership": "by Trust""

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Form 4 Insider Transactions: What Each Field Means →

06/05/2026 - 04:22 PM

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).

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^*

LANIGAN MATTHEW

(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
X	Officer (give title below)	Other (specify below)
	President & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/03/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/03/2026		S		167,375⁽¹⁾	D	$14.4341⁽²⁾	254,699	D
Common Stock								770,249	I	by Trust

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. The reported sale of 167,375 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 4, 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 $14.29 to $14.56, 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 Lanigan	06/05/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did NPKI CEO Matthew Lanigan report in this Form 4?

Matthew Lanigan reported selling 167,375 shares of NPK International common stock. The sale occurred on June 3, 2026 at a weighted average price of $14.4341 per share in open-market transactions under a pre-arranged Rule 10b5-1 trading plan.

At what price did NPKI shares sell in Matthew Lanigan’s transaction?

The reported weighted average sale price was $14.4341 per share. Footnotes state shares were sold in multiple open-market trades between $14.29 and $14.56, and detailed breakdowns are available upon request from the company, any security holder, or SEC staff.

How many NPKI shares does Matthew Lanigan hold after this sale?

After the reported sale, Matthew Lanigan holds 254,699 NPK International common shares directly. He also has 770,249 shares held indirectly through a trust, according to the ownership information disclosed in the Form 4 filing for June 3, 2026.

Did the NPKI Form 4 show any option exercises or derivatives activity?

No derivative transactions are listed in this Form 4. The derivative summary is empty and all disclosed activity involves non-derivative common stock, indicating this particular filing reflects only share sales and resulting holdings, not option exercises or conversions.