OBERWEIS ASSET MANAGEMENT INC/

Position in NPKI — NPK International Inc.

CIK 937886 LISLE, IL

Position in NPKI

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$9,347,920

+$1,839,927 QoQ

Shares Held

587,550

+13.4% QoQ

Ownership

0.692%

of shares outstanding

% of Portfolio

0.19%

of 13F equity value

Holder Rank

#39

of 255 holders

Holding Since

Jun 2025

5 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Industrials · as of Jun 30, 2026

OBERWEIS ASSET MANAGEMENT INC/ holds $44,633,546 across 3 Building Products & Equipment names. NPKI ranks #3 (20.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	SPXC	SPX Technologies, Inc.	83,811	$20,547,942
2	ARLO	Arlo Technologies, Inc.	1,093,300	$14,737,684
3	NPKI	NPK International Inc. This page	587,550	$9,347,920

5 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$9,347,920	587,550	+13.4%	Shares	Sole	2026-08-14
2026-03-31	$7,507,993	518,150	+1.8%	Shares	Sole	2026-05-15
2025-12-31	$6,064,300	508,750	+2.5%	Shares	Sole	2026-02-17
2025-09-30	$5,615,415	496,500	0.0%	Shares	Sole	2025-11-17
2025-06-30	$4,225,215	496,500	—	Shares	Sole	2025-08-14
No filing history on record for this holder in this stock.