OBERWEIS ASSET MANAGEMENT INC/

Position in AMPX — Amprius Technologies, Inc.

CIK 937886 LISLE, IL

Position in AMPX

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

Position Value

$8,817,732

-$1,045,368 QoQ

Shares Held

636,200

+8.8% QoQ

Ownership

0.436%

of shares outstanding

% of Portfolio

0.18%

of 13F equity value

Holder Rank

#39

of 259 holders

Holding Since

Mar 2026

2 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Industrials · as of Jun 30, 2026

OBERWEIS ASSET MANAGEMENT INC/ holds $78,653,719 across 3 Electrical Equipment & Parts names. AMPX ranks #3 (11.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	POWL	Powell Industries Inc	179,521	$51,407,633
2	AEIS	Advanced Energy Industries Inc	49,423	$18,428,354
3	AMPX	Amprius Technologies, Inc. This page	636,200	$8,817,732

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$8,817,732	636,200	+8.8%	Shares	Sole	2026-08-14
2026-03-31	$9,863,100	585,000	—	Shares	Sole	2026-05-15
No filing history on record for this holder in this stock.