OBERWEIS ASSET MANAGEMENT INC/

Long Only Manager • Growth

OBERWEIS ASSET MANAGEMENT INC/ is a Long Only Manager specializing in Growth based in Lisle, IL led by James Walter Oberweis, reporting $3.9B in AUM as of Q3 2025 with 40% Technology concentration and 40% technology allocation.

PresidentJames Walter Oberweis

Portfolio Value: $2.6B
Positions: 181
Top Holding: CRDO at 3.6%
Last Reported: Q3 2025

Address3333 Warrenville Road, Suite 500, Lisle, IL, 60532, United States

Top Holdings

Largest long holdings in OBERWEIS ASSET MANAGEMENT INC/'s portfolio (19.8% of total portfolio)

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Holding	Sector	Position	Weight	Traded	Ownership	Owned Since
1 Credo Technology Group Holding Ltd CRDO	Communication Equipment Technology	$93.8M	3.60%	-$16.7M Sold	0.37% 643.9K shares	Q1 2024 Held for 1y 8m
2 Lumentum Holdings Inc. LITE	Communication Equipment Technology	$53.5M	2.05%	+$9.7M Bought	0.47% 328.6K shares	Q2 2025 Held for 5 months
3 Rambus RMBS	Semiconductors Technology	$52.9M	2.03%	+$220.8K Bought	0.47% 507.9K shares	Q4 2024 Held for 11 months
4 Ambarella AMBA	Semiconductors Technology	$50.4M	1.94%	+$3.1M Bought	1.43% 611.4K shares	Q3 2024 Held for 1y 2m
5 SharkNinja SN	Furnishings, Fixtures & Appliances Consumer Cyclical	$49.8M	1.91%	-$180.5K Sold	0.34% 482.8K shares	Q1 2024 Held for 1y 8m
6 Applied Optoelectronics AAOI	Semiconductors Technology	$49.0M	1.88%	—	3.03% 1.9M shares	Q3 2023 Held for 2y 2m
7 Encompass Health Corporation EHC	Medical - Care Facilities Healthcare	$45.6M	1.75%	-$28.6K Sold	0.36% 358.8K shares	Q2 2023 Held for 2y 5m
8 Frontdoor, Inc. FTDR	Personal Products & Services Consumer Cyclical	$41.1M	1.58%	—	0.84% 610.9K shares	Q2 2023 Held for 2y 5m
9 ADMA Biologics ADMA	Biotechnology Healthcare	$39.8M	1.53%	-$6.2M Sold	1.14% 2.7M shares	Q4 2022 Held for 2y 11m
10 American Superconductor AMSC	Industrial - Machinery Industrials	$39.5M	1.52%	-$148.5K Sold	1.47% 665.7K shares	Q4 2023 Held for 1y 11m

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Changes

Portfolio activity, position movements, and quarter-over-quarter changes in OBERWEIS ASSET MANAGEMENT INC/'s latest filing

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Market Value

$2.6B

Prior: $2.3B

Q/Q Change

+13.38%

+$307.5M

Net Flows % of MV

-2.25%

Turnover Ratio

11.96%

New Purchases

11 stocks

$109.4M

Added To

43 stocks

+$119.9M

Sold Out Of

25 stocks

$201.9M

Reduced Holdings

40 stocks

-$86.0M

Increased Positions

Position	Shares Δ	Change
1 Levi Strauss & Co. LEVI	New	0 → 903.5K +$21.1M
2 New York Times NYT	New	0 → 252.0K +$14.5M
3 Sensient Technology SXT	New	0 → 134.2K +$12.6M
4 Genius Sports GENI	New	0 → 1.0M +$12.6M
5 Zurn Elkay Water Solutions ZWS	New	0 → 266.0K +$12.5M

Decreased Positions

Position	Shares Δ	Change
1 Mr. Cooper Group Inc. COOP	Sold	155.8K → 0 −$23.2M
2 Primo Brands PRMB	Sold	611.3K → 0 −$18.1M
3 Great Atlantic & Pacific Tea Company GAP	Sold	790.3K → 0 −$17.2M
4 BellRing Brands BRBR	Sold	264.2K → 0 −$15.3M
5 Oscar Health OSCR	Sold	578.4K → 0 −$12.4M