OBERWEIS ASSET MANAGEMENT INC/

OBERWEIS ASSET MANAGEMENT INC/ latest Q1_2021 13F filings reported $488,893,000 in market value on this 2021-05-17 report date . The portfolio quarterly return is 28.73%. This fund has 170 securities concentrations of 100% weights.

OBERWEIS ASSET MANAGEMENT INC/ largest holding is Constellium SE Ordinary Shares (France) with weight of 18.65% and $91,190,000 in market value. The portfolio return is computed based on the amount invested in the new quarter. The following shows the portfolio details.

Portfolio Performance History

FILE DATE	REPORT PERIOD	QTR YEAR	FILE TYPE	NOS. OF STOCKS	REPORTED VALUE	RETURN
2021-05-17	2021-03-31	Q1_2021	13F-HR	170	$488,893,000	28.73%
2021-02-16	2020-12-31	Q4_2020	13F-HR	138	$379,790,000	27.86%

Portfolio Details

Stock Name	Tickers	Value	Current Value (x1000)	Change Value %	Weight	Computed Price	Shares Change %	Current Shares
CONSTELLIUM SE COMMON EUR0.020000	CSTM	INCR	$91,190	0.02%	18.65%	$14.70	-0.03%	6,203,397
FIVERR INTL LTD	FVRR	INCR	$73,760	0.08%	15.09%	$217.18	-0.03%	339,624
KORNIT DIGITAL LTD	KRNT	BUY	$41,318	0.00%	8.45%	$99.12	0.00%	416,851
ENDAVA PLC	DAVA	INCR	$40,061	0.11%	8.19%	$84.69	0.01%	473,031
SEA LTD	SE	INCR	$11,176	4.22%	2.29%	$223.24	3.65%	50,063
CHANNELADVISOR CORP	ECOM	INCR	$10,077	1.00%	2.06%	$23.55	0.36%	427,900
ORGANOGENESIS HLDGS INC	ORGO	BUY	$8,881	0.00%	1.82%	$18.22	0.00%	487,420
UPWORK INC	UPWK	DECR	$8,299	-0.40%	1.70%	$44.77	-0.54%	185,370
ALPHATEC HLDGS INC COM NEW	ATEC	INCR	$6,876	0.80%	1.41%	$15.79	0.65%	435,460
SYNAPTICS INC	SYNA	INCR	$6,676	2.48%	1.37%	$135.42	1.47%	49,300
CASTLE BIOSCIENCES	CSTL	DECR	$6,645	-0.39%	1.36%	$68.46	-0.40%	97,070
SHUTTERSTOCK INC	SSTK	INCR	$6,337	0.54%	1.30%	$89.04	0.24%	71,169
II-VI INC	IIVI	INCR	$5,672	1.07%	1.16%	$68.37	1.30%	82,960
DECKERS OUTDOOR CORP	DECK	INCR	$5,326	0.15%	1.09%	$330.40	0.00%	16,120
INMODE LTD	INMD	INCR	$5,222	2.18%	1.07%	$72.37	1.09%	72,160
TUPPERWARE BRANDS CORP	TUP	INCR	$5,135	0.09%	1.05%	$26.41	0.33%	194,440
ULTRA CLEAN HOLDINGS INCORPORATED COMMON STOCK USD0.001	UCTT	INCR	$4,655	3.04%	0.95%	$58.04	1.17%	80,210
CAREDX INC	CDNA	DECR	$4,483	-0.50%	0.92%	$68.09	-0.47%	65,840
21VIANET GROUP INC	VNET	INCR	$4,257	0.12%	0.87%	$32.30	0.21%	131,800
BJS WHSL CLUB HLDGS INC	BJ	INCR	$3,895	1.26%	0.80%	$44.86	0.87%	86,830
MALIBU BOATS INC	MBUU	INCR	$3,646	2.06%	0.75%	$79.68	1.40%	45,760
MODEL N INC	MODN	INCR	$3,334	0.11%	0.68%	$35.23	0.12%	94,640
SHOPIFY INC	SHOP	INCR	$3,231	4.70%	0.66%	$1106.51	4.83%	2,920
AVIAT NETWORKS INC	AVNW	BUY	$3,019	0.00%	0.62%	$71.04	0.00%	42,500
AXCELIS TECHNOLOGIES INCORPORATED COMMON STOCK USD0.001	ACLS	INCR	$2,974	1.07%	0.61%	$41.09	0.47%	72,380
HALOZYME THERAPEUTICS INC	HALO	BUY	$2,872	0.00%	0.59%	$41.68	0.00%	68,900
BILIBILI INC	BILI	INCR	$2,623	0.38%	0.54%	$107.06	0.10%	24,500
CADENCE DESIGN SYSTEM INC	CDNS	INCR	$2,661	3.93%	0.54%	$137.00	3.91%	19,424
MASONITE INTL CORP	DOOR	INCR	$2,627	0.87%	0.54%	$115.24	0.59%	22,795
GOLDEN NUGGET ONLINE GAMIN	GNOG	INCR	$2,368	0.00%	0.48%	$13.50	0.46%	175,400
ANGIODYNAMICS INC		BUY	$2,300	0.00%	0.47%	$23.40	0.00%	98,300
AMERESCO INC	AMRC	INCR	$2,091	0.09%	0.43%	$48.62	0.17%	43,008
RAPID7 INC	RPD	DECR	$1,961	-0.21%	0.40%	$74.62	-0.05%	26,280
MAGNACHIP SEMICONDUCTOR CORP	MX	INCR	$1,800	0.56%	0.37%	$24.90	-0.15%	72,300
VONAGE HLDGS CORP	VG	INCR	$1,787	10.53%	0.37%	$11.82	11.60%	151,210
BOOT BARN HLDGS	BOOT	INCR	$1,770	0.44%	0.36%	$62.32	0.00%	28,400
S & P DEPOSITORY RECEIPTS	SPY	INCR	$1,735	0.06%	0.35%	$396.39	0.00%	4,377
ZUMIEZ INC	ZUMZ	INCR	$1,729	0.17%	0.35%	$42.90	0.00%	40,300
TREX CO INC	TREX	DECR	$1,670	-0.06%	0.34%	$91.56	-0.14%	18,240
AVID BIOSERVICES INC	CDMO	INCR	$1,575	0.43%	0.32%	$18.23	-0.10%	86,400
HEIDRICK & STRUGGLES INTL IN	HSII	INCR	$1,554	0.96%	0.32%	$35.72	0.61%	43,500
M/I HOMES INC	MHO	INCR	$1,554	0.33%	0.32%	$59.09	0.00%	26,300
TEMPUR SEALY INTL INC	TPX	INCR	$1,567	0.31%	0.32%	$36.56	-0.03%	42,865
VERITIV CORP	VRTV	BUY	$1,531	0.00%	0.31%	$42.53	0.00%	36,000
ACADIA HEALTHCARE COMPANY IN	ACHC	INCR	$1,464	0.11%	0.30%	$57.13	-0.02%	25,625
DIEBOLD NXDF INC	DBD	BUY	$1,474	0.00%	0.30%	$14.13	0.00%	104,300
KFORCE INC	KFRC	BUY	$1,447	0.00%	0.30%	$53.59	0.00%	27,000
MAGNITE INC	MGNI	DECR	$1,455	-0.83%	0.30%	$41.61	-0.87%	34,967
CRA INTL INC	CRAI	INCR	$1,381	0.47%	0.28%	$74.65	0.00%	18,500
CAMTEK LTD	CAMT	INCR	$1,375	0.06%	0.28%	$29.90	-0.22%	45,980
COMMERCIAL VEHICLE GROUP INCORPORATED COMMON STOCK USD0.01	CVGI	INCR	$1,389	0.64%	0.28%	$9.65	0.47%	143,900
CROSS CTRY HEALTHCARE INC	CCRN	INCR	$1,373	1.43%	0.28%	$12.49	0.72%	109,900
LIQTECH INTERNATIONAL INCORPORATED USD0.001	LIQT	INCR	$1,365	0.01%	0.28%	$8.09	0.00%	168,729
RADNET INC	RDNT	BUY	$1,349	0.00%	0.28%	$21.76	0.00%	62,000
UPLAND SOFTWARE	UPLD	INCR	$1,350	0.03%	0.28%	$47.20	0.00%	28,600
COHU INC	COHU	INCR	$1,325	0.10%	0.27%	$41.83	0.00%	31,676
CROCS INC	CROX	DECR	$1,325	-0.32%	0.27%	$80.45	-0.47%	16,470
FULL HSE RESORTS INC	FLL	INCR	$1,298	2.30%	0.27%	$8.51	0.53%	152,543
PERFICIENT INC	PRFT	INCR	$1,321	0.23%	0.27%	$58.71	0.00%	22,500
MAXLINEAR INC	MXL	INCR	$1,263	3.36%	0.26%	$34.09	3.88%	37,050
VOXX INTL CORP	VOXX	INCR	$1,285	0.22%	0.26%	$19.07	-0.18%	67,400
DIGITAL TURBINE INC	APPS	DECR	$1,211	-0.58%	0.25%	$80.33	-0.71%	15,075
MOVADO GROUP INC	MOV	BUY	$1,209	0.00%	0.25%	$28.45	0.00%	42,500
DASEKE INC	DSKE	INCR	$1,168	1.87%	0.24%	$8.49	0.97%	137,600
ENTRAVISION COMMUNICATIONS C		BUY	$1,185	0.00%	0.24%	$4.04	0.00%	293,300
HIMAX TECHNOLOGIES INC	HIMX	BUY	$1,160	0.00%	0.24%	$13.65	0.00%	85,000
MERCANTILE BANK CORP	MBWM	INCR	$1,184	1.23%	0.24%	$32.46	0.87%	36,472
TRIP COM GROUP LTD	TCOM	BUY	$1,189	0.00%	0.24%	$39.63	0.00%	30,000
VOCERA COMMUNICATIONS INC	VCRA	INCR	$1,186	0.02%	0.24%	$38.47	0.10%	30,826
PINDUODUO INC	PDD	DECR	$1,138	-0.42%	0.23%	$133.88	-0.23%	8,500
BUILDERS FIRSTSOURCE INC	BLDR	INCR	$1,062	3.41%	0.22%	$46.38	2.88%	22,900
ENPRO INDS INC		DECR	$1,057	-0.15%	0.22%	$85.24	-0.24%	12,400
FARFETCH LTD	FTCH	INCR	$1,023	1.03%	0.21%	$53.01	1.44%	19,300
FLEXSTEEL INDS INC	FLXS	DECR	$1,046	0.00%	0.21%	$34.87	0.00%	30,000
HACKETT GROUP INC	HCKT	BUY	$1,016	0.00%	0.21%	$16.39	0.00%	62,000
RPC INC	RES	INCR	$1,023	2.24%	0.21%	$5.40	0.89%	189,400
SHYFT GROUP INC	SHYF	DECR	$1,019	-0.46%	0.21%	$37.19	-0.59%	27,400
ALLIED MOTION TECHNOLOGIES I	AMOT	INCR	$955	0.01%	0.20%	$51.34	0.00%	18,600
COLLEGIUM PHARMACEUTICAL INC COMMON STOCK USD0.001	COLL	INCR	$976	0.06%	0.20%	$23.69	-0.10%	41,200
GRIFFON CORP	GFF	INCR	$1,000	0.33%	0.20%	$27.17	0.00%	36,800
INOTIV INC		BUY	$1,000	0.00%	0.20%	$20.00	0.00%	50,000
NEURONETICS INC	STIM	BUY	$971	0.00%	0.20%	$12.37	0.00%	78,500
ABSOLUTE SOFTWARE CORP	ABST	BUY	$920	0.00%	0.19%	$13.88	0.00%	66,300
APPLE INC	AAPL	DECR	$905	-0.15%	0.19%	$122.08	-0.07%	7,413
CEVA INC	CEVA	INCR	$932	0.23%	0.19%	$56.14	0.00%	16,600
DAQO NEW ENERGY CORP	DQ	BUY	$906	0.00%	0.19%	$75.50	0.00%	12,000
EMPLOYERS HOLDINGS INC	EIG	BUY	$947	0.00%	0.19%	$43.05	0.00%	22,000
EXTREME NETWORKS INC	EXTR	BUY	$929	0.00%	0.19%	$8.75	0.00%	106,200
OOMA INC	OOMA	INCR	$941	0.10%	0.19%	$15.84	0.00%	59,400
JOHNSON OUTDOORS INC	JOUT	BUY	$857	0.00%	0.18%	$142.83	0.00%	6,000
LUNA INNOVATIONS	LUNA	BUY	$895	0.00%	0.18%	$10.53	0.00%	85,000
VISHAY PRECISION GROUP INC	VPG	INCR	$893	0.59%	0.18%	$30.79	0.63%	29,000
ANTARES PHARMA INC	ATRS	INCR	$824	0.03%	0.17%	$4.11	0.00%	200,600
PATTERSON-UTI ENERGY INC	PTEN	INCR	$813	0.36%	0.17%	$7.13	0.00%	114,000
RIBBON COMMUNICATIONS INC	RBBN	INCR	$832	0.76%	0.17%	$8.21	0.41%	101,400
FIRST FNDTN INC	FFWM	INCR	$769	0.17%	0.16%	$23.45	0.00%	32,800
FUTU HLDGS LTD	FUTU	BUY	$715	0.00%	0.15%	$158.89	0.00%	4,500
INTERNATIONAL MONEY EXPRESS USD0.000100	IMXI	DECR	$720	-0.03%	0.15%	$15.00	0.00%	48,000
MYR GROUP INC DEL	MYRG	DECR	$724	-0.32%	0.15%	$71.68	-0.43%	10,100
STRATTEC SEC CORP	STRT	BUY	$755	0.00%	0.15%	$46.89	0.00%	16,100
TENCENT MUSIC ENTMT GROUP	TME	BUY	$717	0.00%	0.15%	$20.49	0.00%	35,000
ADTRAN INC	ADTN	INCR	$664	0.13%	0.14%	$16.68	0.00%	39,800
AIR TRANSPORT SERVICES GRP I	ATSG	DECR	$702	-0.38%	0.14%	$29.25	-0.34%	24,000
J P MORGAN CHASE & CO COM	JPM	INCR	$674	0.18%	0.14%	$152.14	-0.01%	4,430
MICROSOFT CORP	MSFT	INCR	$679	0.05%	0.14%	$235.76	-0.01%	2,880
360 FINANCE INC -ADR 2 ORD	QFIN	BUY	$624	0.00%	0.13%	$26.00	0.00%	24,000
AMEDISYS INC	AMED	DECR	$636	-0.24%	0.13%	$264.78	-0.16%	2,402
CLEARFIELD INC	CLFD	INCR	$651	0.22%	0.13%	$30.14	0.00%	21,600
EL POLLO LOCO HLDGS INC	LOCO	DECR	$613	-0.11%	0.13%	$16.13	0.00%	38,000
HELMERICH & PAYNE INC	HP	BUY	$620	0.00%	0.13%	$26.98	0.00%	22,981
VAREX IMAGING CORP	VREX	BUY	$615	0.00%	0.13%	$20.50	0.00%	30,000
BAIDU INC	BIDU	BUY	$600	0.00%	0.12%	$217.39	0.00%	2,760
NATURAL GROCERS BY VITAMIN C	NGVC	INCR	$548	0.28%	0.11%	$17.56	0.00%	31,200
TAL EDUCATION GROUP	TAL	DECR	$539	-0.75%	0.11%	$53.90	-0.67%	10,000
XPENG INC	XPEV	BUY	$548	0.00%	0.11%	$36.53	0.00%	15,000
ACM RESEARCH INCORPORATED CLASS A COMMON STOCK USD0.0001	ACMR	BUY	$485	0.00%	0.10%	$80.83	0.00%	6,000
KINGSOFT CLOUD HLDGS LTD	KC	BUY	$476	0.00%	0.10%	$39.34	0.00%	12,100
MASTERCARD INCORPORATED	MA	DECR	$478	0.00%	0.10%	$355.65	0.00%	1,344
PREFORMED LINE PRODS CO	PLPC	INCR	$481	0.00%	0.10%	$68.71	0.00%	7,000
ALIBABA GROUP HOLDING	BABA	DECR	$435	-0.07%	0.09%	$226.56	-0.04%	1,920
HELIX ENERGY SOLUTIONS GRP I		INCR	$421	0.20%	0.09%	$5.05	0.00%	83,300
ACCURAY INC	ARAY	INCR	$401	0.15%	0.08%	$4.95	-0.03%	81,000
AMGEN	AMGN	INCR	$372	0.08%	0.08%	$248.83	0.00%	1,495
INTEL CORP	INTC	INCR	$370	0.25%	0.08%	$63.94	-0.03%	5,787
JOHNSON & JOHNSON	JNJ	INCR	$409	0.05%	0.08%	$164.46	0.00%	2,487
NEWMONT CORP	NEM	DECR	$372	-0.01%	0.08%	$60.23	-0.01%	6,176
TRAVELERS COMPANIES INC	TRV	INCR	$367	0.05%	0.08%	$150.41	-0.02%	2,440
ZHIHU INC		BUY	$365	0.00%	0.07%	$8.11	0.00%	45,000
ADIENT PLC	ADNT	BUY	$305	0.00%	0.06%	$44.20	0.00%	6,900
ADVANCED ENERGY INDS	AEIS	BUY	$273	0.00%	0.06%	$109.20	0.00%	2,500
AMAZON COM INC	AMZN	DECR	$309	-0.05%	0.06%	$3090.00	0.00%	100
AT HOME GROUP INC	HOME	BUY	$293	0.00%	0.06%	$28.73	0.00%	10,200
CLEAN HARBORS INC	CLH	DECR	$303	0.00%	0.06%	$84.17	-0.10%	3,600
CONCENTRIX CORP	CNXC	BUY	$284	0.00%	0.06%	$149.47	0.00%	1,900
RESMED INC	RMD	DECR	$281	-0.09%	0.06%	$193.79	0.00%	1,450
SELECT MED HLDGS CORP	SEM	INCR	$317	0.26%	0.06%	$34.09	0.02%	9,300
2U Inc	TWOU	BUY	$229	0.00%	0.05%	$38.17	0.00%	6,000
AMKOR TECHNOLOGY INC	AMKR	BUY	$230	0.00%	0.05%	$23.71	0.00%	9,700
BEACON ROOFING SUPPLY INC	BECN	BUY	$262	0.00%	0.05%	$52.40	0.00%	5,000
COMMVAULT SYSTEMS INC	CVLT	BUY	$252	0.00%	0.05%	$64.62	0.00%	3,900
GREEN DOT CORP	GDOT	DECR	$243	-0.09%	0.05%	$45.85	0.10%	5,300
HEADHUNTER ADR (PROPOSED) PLC	HHR	BUY	$231	0.00%	0.05%	$33.97	0.00%	6,800
HILLENBRAND INC	HI	DECR	$248	-0.10%	0.05%	$47.69	-0.25%	5,200
ICF INTL INC	ICFI	BUY	$245	0.00%	0.05%	$87.50	0.00%	2,800
MCDONALDS CORP	MCD	INCR	$241	0.05%	0.05%	$223.98	0.00%	1,076
NEXTGEN HEALTHCARE INC	NXGN	BUY	$230	0.00%	0.05%	$18.11	0.00%	12,700
REALOGY HLDGS CORP	RLGY	INCR	$227	0.38%	0.05%	$15.13	0.19%	15,000
STEWART INFORMATION SVCS COR	STC	DECR	$229	-0.05%	0.05%	$52.05	-0.12%	4,400
TTEC HLDGS INC	TTEC	DECR	$221	-0.24%	0.05%	$100.45	-0.45%	2,200
UFP INDUSTRIES INC	UFPI	BUY	$265	0.00%	0.05%	$75.71	0.00%	3,500
WALMART INC	WMT	DECR	$239	-0.06%	0.05%	$135.95	0.00%	1,758
ASGN INC	ASGN	DECR	$200	-0.25%	0.04%	$95.24	-0.34%	2,100
ALPHABET INC		BUY	$207	0.00%	0.04%	$2070.00	0.00%	100
BHP GROUP LTD	BHP	INCR	$211	0.01%	0.04%	$69.34	-0.05%	3,043
BANK NEW YORK MELLON CORP	BK	BUY	$201	0.00%	0.04%	$47.33	0.00%	4,247
CENTRAL GARDEN & PET CO	CENT	BUY	$220	0.00%	0.04%	$57.89	0.00%	3,800
CORNERSTONE ONDEMAND INC	CSOD	BUY	$200	0.00%	0.04%	$43.48	0.00%	4,600
GEOPARK LTD	GPRK	INCR	$200	0.23%	0.04%	$16.00	0.00%	12,500
GUESS INC	GES	BUY	$207	0.00%	0.04%	$23.52	0.00%	8,800
MACOM TECH SOLUTIONS HLDGS I	MTSI	BUY	$220	0.00%	0.04%	$57.89	0.00%	3,800
MERIT MED SYS INC	MMSI	BUY	$210	0.00%	0.04%	$60.00	0.00%	3,500
NOV INC	NOV	NA	$176	0.00%	0.04%	$13.75	0.00%	12,800
OPTION CARE HEALTH INC	OPCH	BUY	$181	0.00%	0.04%	$17.75	0.00%	10,200
PENNYMAC FINL SVCS INC NEW	PFSI	BUY	$207	0.00%	0.04%	$66.77	0.00%	3,100
TERADATA CORP DEL	TDC	BUY	$220	0.00%	0.04%	$38.60	0.00%	5,700
AMR Corp Escrow		NA	$0	0.00%	0.00%	$0.00	0.00%	18,000
American Power Corp		NA	$0	0.00%	0.00%	$0.00	0.00%	10,000
Avatar Ventures	ATAR	NA	$0	0.00%	0.00%	$0.00	0.00%	10,000
Titan Oil & Gas, Inc.		NA	$0	0.00%	0.00%	$0.00	0.00%	10,000
Xenacare Hldgs, Inc.		NA	$0	0.00%	0.00%	$0.00	0.00%	140,000
A10 NETWORKS INC	ATEN	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
ADDUS HOMECARE CORP	ADUS	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
ARCO PLATFORM LTD	ARCE	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
ARCOSA INC	ACA	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
AUTOHOME INC		SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
BANDWIDTH INC	BAND	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
BIODELIVERY SCIENCES INTL IN	BDSI	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
CACI INTL INC	CACI	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
CHEGG INC	CHGG	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
DADA NEXUS LTD	DADA	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
ENSIGN GROUP INC	ENSG	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
ENTERPRISE FINL SVCS CORP	EFSC	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
INPHI CORP	IPHI	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
INOVALON HLDGS INC	INOV	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
MATSON INC		SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
MERCURY SYS INC	MRCY	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
NIO INC	NIO	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
SONIC AUTOMOTIVE INC	SAH	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
TANDEM DIABETES CARE INC	TNDM	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
JOINT CORP	JYNT	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
TRINET GROUP INC	TNET	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
UNITY SOFTWARE INC	U	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0
VERIZON COMMUNICATIONS INC	VZ	SOLD	$0	0.00%	-100.00%	$0.00	0.00%	0