OBERWEIS ASSET MANAGEMENT INC/

CIK

937886

City

LISLE

State / Country

Stock

UCTT — Ultra Clean Holdings, Inc.

Top Portfolio Positions

177 positions · $3,384,941,871 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio
AAOI	Applied Optoelectronics, Inc. Technology	2,349,969	$198,783,877	5.87%
LITE	Lumentum Holdings Inc. Technology	266,222	$187,090,172	5.53%
CRDO	Credo Technology Group Holding Ltd Technology	1,021,968	$95,932,136	2.83%
DOCN	DigitalOcean Holdings, Inc. Technology	927,505	$79,561,378	2.35%
SN	SharkNinja, Inc. Consumer Cyclical	599,970	$63,536,823	1.88%
NVMI	Nova Ltd. Technology	137,955	$59,911,097	1.77%
DAN	DANA Inc Consumer Cyclical	1,611,500	$54,226,975	1.60%
BTSG	BrightSpring Health Services, Inc. Healthcare	1,158,970	$49,383,711	1.46%
MTSI	MACOM Technology Solutions Holdings, Inc. Technology	215,886	$47,941,804	1.42%
RMBS	Rambus Inc Technology	526,316	$45,278,965	1.34%

25 quarters · across all stocks

25 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$39,824,797	640,476	+1.9%	Shares	Sole	2026-05-15
2025-12-31	$15,919,905	628,500	+2.5%	Shares	Sole	2026-02-17
2025-09-30	$16,712,425	613,300	0.0%	Shares	Sole	2025-11-17
2025-06-30	$13,842,181	613,300	0.0%	Shares	Sole	2025-08-14
2025-03-31	$13,130,753	613,300	0.0%	Shares	Sole	2025-05-15
2024-12-31	$22,048,135	613,300	+39.4%	Shares	Sole	2025-02-14
2024-09-30	$17,573,193	440,100	+37.7%	Shares	Sole	2024-11-14
2024-06-30	$15,660,400	319,600	0.0%	Shares	Sole	2024-08-14
2024-03-31	$14,682,424	319,600	+29.3%	Shares	Sole	2024-05-15
2023-12-31	$8,435,994	247,100	+13.3%	Shares	Sole	2024-02-14
2023-09-30	$6,471,027	218,100	+27.6%	Shares	Sole	2023-11-14
2023-06-30	$6,572,814	170,900	+28.8%	Shares	Sole	2023-08-14
2023-03-31	$4,400,332	132,700	+95.4%	Shares	Sole	2023-05-15
2022-12-31	$2,250,885	67,900	-26.7%	Shares	Sole	2023-02-14
2022-09-30	$2,385,480	92,640	-16.6%	Shares	Sole	2022-11-14
2022-06-30	$3,308,637	111,140	-30.6%	Shares	Sole	2022-08-15
2022-03-31	$6,788,334	160,140	+13.1%	Shares	Sole	2022-05-16
2021-12-31	$8,123,896	141,630	+58.3%	Shares	Sole	2022-02-14
2021-09-30	$3,811,848	89,480	+3.3%	Shares	Sole	2021-11-15
2021-06-30	$4,651,077	86,580	+7.9%	Shares	Sole	2021-08-16
2021-03-31	$4,655,388	80,210	+116.8%	Shares	Sole	2021-05-17
2020-12-31	$1,152,550	37,000	-5.4%	Shares	Sole	2021-02-16
2020-09-30	$839,086	39,100	-32.0%	Shares	Sole	2020-11-16
2020-06-30	$1,301,225	57,500	+2.1%	Shares	Sole	2020-08-14
2020-03-31	$776,940	56,300	—	Shares	Sole	2020-05-15
No 13F history on record for this holder in this stock.