OBERWEIS ASSET MANAGEMENT INC/

Registered adviser

CIK

937886

Location

LISLE, IL

Portfolio Value

Mid $4,839,281,404

Diversification

Diversified

Filing Date

Global Rank

#905 / 8,819 ▲ 127

Top Industry

Semiconductors 16.2%

Period ended 4 months ago

Filed Aug 14, 2026 · 3mo

26 quarters · since Mar 2020

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type

Registered adviser

Form ADV roster, Oct 1, 2026

Form ADV adviser

CRD 105471

Roster of Oct 1, 2026

Regulatory AUM

$5,061,020,947

Main clients

Registered funds and BDCs (64% of AUM)

Private funds

1 fund · Other private funds

Focus by fund count, roster of Oct 1, 2026

$48,751,067 gross assets

Registered funds advised

6 series (0 index, 0 ETFs)

$2,784,689,135 net assets· N-CEN Dec 31, 2025

LEI

549300PDCRBXSQU4DO76

Private funds on Schedule D 7.B.(1)

As filed Oct 18, 2024; SEC's bulk Form ADV archive ends with 2024 filings.

$36,825,866 gross assets in 1 fund Other private funds $36,825,866 (1)

Form ADV history

Monthly rosters from Dec 2019; each row is a run with the same figures, newest first.

Rosters	Regulatory AUM	Main clients
Apr 2026 to Oct 2026	$5,061,020,947	Registered funds and BDCs (64%)
Apr 2025 to Mar 2026	$3,944,834,354	Registered funds and BDCs (64%)
Apr 2024 to Mar 2025	$3,035,722,713	Diversified
May 2023 to Mar 2024	$2,602,359,035	Diversified
Apr 2023	$2,602,359,035	Diversified
Apr 2022 to Mar 2023	$3,784,043,147	Diversified

3 earlier changes not shown.

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, never from the firm's own description.

Style

Diversified active

Top 10 weight 26.6%, 69.3 effective positions, active share 84.4% against the S&P SmallCap 600 as of 2026-06-30; it meets none of the index-like, systematic-like or concentrated tests

Turnover

Medium turnover

45.4% over the last four quarters (30% to under 100%)

Horizon

Horizon unknown

The value-weighted holding period is at least 8.0 quarters, but 3.4% of the book was already held when coverage starts

Closest benchmark: the S&P SmallCap 600 as of 2026-06-30, active share 84.4%; sector active share 35.3% against the combined 13F book's sector weights.

Over time 26 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

View clone backtest

Portfolio Concentration

174 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026

Top Position

5.7%

−0.2 pts

Top 5

18.3%

−0.2 pts

Top 10

26.6%

+0.6 pts

HHI

144

Diversified+1

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Technology	42.6%	$2,062,776,758	49
Industrials	18.9%	$914,328,062	34
Healthcare	18.4%	$892,827,101	36
Consumer Cyclical	10.6%	$513,239,755	19
Financial Services	3.8%	$185,010,750	14
Energy	3.1%	$152,081,381	8
Communication Services	1.0%	$47,605,500	5
Basic Materials	0.7%	$35,834,356	3
Consumer Defensive	0.7%	$33,801,922	5
Unclassified	0.0%	$1,775,819	1

Last Quarter's Activity

Export CSV

Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
NVST	Envista Holdings Corp	+455,382	1,120,782	$29,532,605
ADPT	Adaptive Biotechnologies Corp	+451,800	1,258,751	$27,000,209
WAY	Waystar Holding Corp.	+421,890	1,589,364	$32,629,642
HNGE	Hinge Health, Inc.	+389,710	855,476	$71,004,508
CHYM	Chime Financial, Inc.	+232,800	1,268,330	$25,975,398
CECO	Ceco Environmental Corp	+223,040	358,072	$32,491,453
VISN	Vistance Networks, Inc.	+206,600	1,298,612	$16,596,261
VIAV	Viavi Solutions Inc.	+200,400	793,600	$37,894,400
RSI	Rush Street Interactive, Inc.	+193,370	1,627,930	$48,414,638
LEVI	Levi Strauss & Co	+190,800	1,358,100	$33,721,623
DIOD	Diodes Inc	+189,450	413,750	$45,280,800
DRS	Leonardo DRS, Inc.	+178,986	628,486	$26,817,497
LIVN	LivaNova PLC	+178,250	500,150	$41,127,334
EVLV	Evolv Technologies Holdings, Inc.	+152,000	1,823,949	$10,578,904
POWL	Powell Industries Inc	+145,364	179,521	$51,407,633
BLBD	Blue Bird Corp	+140,600	529,838	$41,836,008
AMSC	American Superconductor Corp	+137,600	987,500	$40,991,125
PUMP	ProPetro Holding Corp.	+131,600	1,097,100	$15,732,414
BW	Babcock & Wilcox Enterprises, Inc.	+127,700	627,900	$8,853,390
INDV	Indivior Pharmaceuticals, Inc.	+125,775	779,188	$31,970,083
ALHC	Alignment Healthcare, Inc.	+123,000	1,089,600	$25,943,376
GMED	Globus Medical Inc	+119,900	512,100	$40,461,021
ZWS	Zurn Elkay Water Solutions Corp	+116,270	468,453	$23,670,930
RELY	Remitly Global, Inc.	+116,100	1,570,400	$35,192,664
CRMD	CorMedix Inc.	+112,800	1,323,915	$10,392,732
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
AAOI	Applied Optoelectronics, Inc.	−558,842	1,791,127	$265,373,376
—		−486,900	293,670	$9,230,048
DAN	DANA Inc	−293,200	1,318,300	$35,870,943
IMAX	Imax Corp	−250,600	326,539	$13,015,844
FSLY	Fastly, Inc.	−218,700	852,322	$15,648,631
LITE	Lumentum Holdings Inc.	−194,037	72,185	$61,939,061
MD	Pediatrix Medical Group, Inc.	−78,000	623,087	$15,782,793
COCO	Vita Coco Company, Inc.	−72,500	83,608	$5,529,833
TPC	Tutor Perini Corp	−70,700	323,200	$26,815,904
ZETA	Zeta Global Holdings Corp.	−51,290	819,770	$16,133,073
MTSI	MACOM Technology Solutions Holdings, Inc.	−36,530	179,356	$68,221,641
NVMI	Nova Ltd.	−29,280	108,675	$59,004,004
BOX	Box Inc	−28,520	743,000	$19,719,220
LOPE	Grand Canyon Education, Inc.	−24,370	92,530	$13,241,968
HTHT	H World Group Ltd	−16,000	8,000	$333,760
AGX	Argan Inc	−12,202	21,120	$16,865,376
SKYW	Skywest Inc	−8,700	383,799	$38,122,754
CRDO	Credo Technology Group Holding Ltd	−8,540	1,013,428	$275,601,744
EZPW	Ezcorp Inc	−7,600	631,800	$21,841,326
SN	SharkNinja, Inc.	−6,470	593,500	$90,372,245
BHE	Benchmark Electronics Inc	−3,600	198,300	$19,566,261
XPRO	Expro Ltd	−2,600	452,000	$6,676,040
PDS	PRECISION DRILLING Corp	−1,800	110,800	$8,493,928
CRS	Carpenter Technology Corp	−1,160	93,273	$57,534,517
TILE	Interface Inc	−700	443,200	$15,884,288
No positions match the current search.

New Positions

Positions the filer opened this quarter

22 positions

Ticker	Company	Shares	Value
MXL	Maxlinear, Inc	319,500	$40,905,585
NOVT	Novanta Inc	244,260	$39,628,742
BLLN	BillionToOne, Inc.	299,030	$35,877,619
ESI	Element Solutions Inc	740,100	$35,339,775
OUST	Ouster, Inc.	545,810	$34,124,041
CGNX	Cognex Corp	427,820	$30,982,724
GVA	Granite Construction Inc	193,090	$30,523,667
PDFS	Pdf Solutions Inc	426,400	$30,184,856
MYRG	Myr Group Inc.	54,190	$27,116,676
KGS	Kodiak Gas Services, Inc.	355,870	$26,736,513
OMDA	Omada Health, Inc.	1,048,800	$23,021,160
WLDN	Willdan Group, Inc.	262,700	$20,779,570
FORM	Formfactor Inc	127,330	$20,363,886
WTS	Watts Water Technologies Inc	50,840	$19,901,318
OPLN	OPENLANE, Inc.	480,580	$19,819,119
TRS	Trimas Corp	362,000	$16,300,860
INOD	Innodata Inc	189,200	$14,299,736
VVX	V2X, Inc.	147,370	$10,987,907
KFRC	Kforce Inc	176,200	$8,267,304
CHEF	Chefs' Warehouse, Inc.	57,544	$5,529,978
INTC	Intel Corp	2,314	$323,103
LLY	ELI LILLY & Co	183	$219,495
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
FLS	Flowserve Corp	434,681	$31,953,400
PRIM	Primoris Services Corp	166,100	$23,758,944
G	Genpact LTD	606,832	$22,604,492
ATEC	Alphatec Holdings, Inc.	1,908,293	$20,762,227
EYE	National Vision Holdings, Inc.	797,780	$20,662,502
PEGA	Pegasystems Inc	455,290	$19,377,142
AEO	American Eagle Outfitters Inc	1,044,900	$17,449,830
WGS	GeneDx Holdings Corp.	261,370	$16,785,181
SHAK	Shake Shack Inc.	187,570	$16,594,317
MIR	Mirion Technologies, Inc.	744,267	$13,835,923
PI	Impinj Inc	118,086	$12,127,432
QLYS	Qualys, Inc.	118,900	$10,445,365
AORT	Artivion, Inc.	221,122	$8,097,487
—		154,700	$7,796,880
LINC	Lincoln Educational Services Corp	188,447	$7,666,023
CRAI	Cra International, Inc.	36,470	$5,903,763
HURN	Huron Consulting Group Inc.	42,300	$5,392,827
TCMD	Tactile Systems Technology Inc	202,839	$5,300,183
COUR	Coursera, Inc.	821,800	$4,782,876
BRCB	Black Rock Coffee Bar, Inc.	365,600	$4,723,552
CLMB	Climb Global Solutions, Inc.	211,840	$4,198,668
FUTU	Futu Holdings Ltd	4,500	$615,420
WEAV	Weave Communications, Inc.	72,830	$336,474
GLD	Spdr Gold Trust	675	$290,445
IBEX	IBEX Ltd	10,200	$273,564
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

174 tracked positions · $4,839,281,404 total · filing declares 176 positions · $4,839,542,355 · as of Jun 30, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Energy Financial Services Healthcare Industrials Technology

Showing 1–50 of 174 positions by value · page 1 of 4

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	Held (qtrs)	Est. cost/share	% of Portfolio
CRDO	Credo Technology Group Holding Ltd Technology	Reduced	1,013,428	-8,540	$275,601,744	+187.3%	10	$67.76	5.70%
AAOI	Applied Optoelectronics, Inc. Technology	Reduced	1,791,127	-558,842	$265,373,376	+33.5%	12	$25.81	5.48%
DOCN	DigitalOcean Holdings, Inc. Technology	Added	930,005	+2,500	$146,038,685	+83.6%	8	$40.06	3.02%
SIMO	Silicon Motion Technology CORP Technology	Added	316,350	+33,800	$105,448,945	+232.4%	11	$90.60	2.18%
UCTT	Ultra Clean Holdings, Inc. Technology	Added	647,276	+6,800	$92,295,084	+131.8%	26+	before history	1.91%
SN	SharkNinja, Inc. Consumer Cyclical	Reduced	593,500	-6,470	$90,372,245	+42.2%	10	$75.28	1.87%
SITM	SITIME Corp Technology	Added	119,501	+220	$89,095,165	+116.3%	5	$215.80	1.84%
BTSG	BrightSpring Health Services, Inc. Healthcare	Added	1,185,280	+26,310	$82,661,427	+67.4%	5	$26.01	1.71%
HNGE	Hinge Health, Inc. Healthcare	Added	855,476	+389,710	$71,004,508	+295.3%	2	$47.36	1.47%
RMBS	Rambus Inc Technology	Added	527,016	+700	$69,956,103	+54.5%	7	$58.43	1.45%
MTSI	MACOM Technology Solutions Holdings, Inc. Technology	Reduced	179,356	-36,530	$68,221,641	+42.3%	8	$130.50	1.41%
LITE	Lumentum Holdings Inc. Technology	Reduced	72,185	-194,037	$61,939,061	−66.9%	5	$80.70	1.28%
LSCC	Lattice Semiconductor Corp Technology	Added	391,816	+17,380	$59,932,175	+72.6%	4	$69.30	1.24%
NVMI	Nova Ltd. Technology	Reduced	108,675	-29,280	$59,004,004	−1.5%	8	$246.42	1.22%
CRS	Carpenter Technology Corp Industrials	Reduced	93,273	-1,160	$57,534,517	+54.6%	11	$118.59	1.19%
FTDR	Frontdoor, Inc. Consumer Cyclical	Added	719,060	+1,100	$55,791,865	+47.0%	13	$43.48	1.15%
ECG	Everus Construction Group, Inc. Industrials	Added	328,183	+1,650	$54,461,968	+41.3%	5	$63.99	1.13%
VCYT	Veracyte, Inc. Healthcare	Added	877,734	+37,900	$51,549,317	+90.6%	15	$27.85	1.07%
POWL	Powell Industries Inc Industrials	Added	179,521	+145,364	$51,407,633	+178.2%	12	unpriced	1.06%
LTH	Life Time Group Holdings, Inc. Consumer Cyclical	Added	1,189,620	+29,120	$48,584,080	+55.4%	6	$28.71	1.00%
RSI	Rush Street Interactive, Inc. Consumer Cyclical	Added	1,627,930	+193,370	$48,414,638	+55.2%	10	$11.58	1.00%
MRCY	Mercury Systems Inc Industrials	Added	392,723	+1,700	$48,041,804	+68.5%	6	$45.17	0.99%
BROS	Dutch Bros Inc. Consumer Cyclical	Added	656,093	+57,600	$47,114,038	+55.4%	9	$50.70	0.97%
CLH	Clean Harbors Inc Industrials	Added	153,475	+9,120	$45,850,656	+10.8%	23	$190.72	0.95%
SEI	Solaris Energy Infrastructure, Inc. Energy	Added	564,581	+32,692	$45,426,187	+51.1%	6	$37.91	0.94%
DIOD	Diodes Inc Technology	Added	413,750	+189,450	$45,280,800	+195.7%	5	$73.65	0.94%
ACA	Arcosa, Inc. Industrials	Added	295,450	+27,750	$42,925,930	+51.1%	7	$103.76	0.89%
BLBD	Blue Bird Corp Industrials	Added	529,838	+140,600	$41,836,008	+89.3%	14	$36.84	0.86%
CAMT	Camtek Ltd Technology	Added	253,380	+30,600	$41,331,345	+22.4%	26+	before history	0.85%
LIVN	LivaNova PLC Healthcare	Added	500,150	+178,250	$41,127,334	+101.0%	4	$61.06	0.85%
AMSC	American Superconductor Corp Industrials	Added	987,500	+137,600	$40,991,125	+42.5%	11	$21.24	0.85%
MXL	Maxlinear, Inc Technology	NEW	319,500	NEW	$40,905,585	NEW	1	$70.73	0.85%
GMED	Globus Medical Inc Healthcare	Added	512,100	+119,900	$40,461,021	+19.7%	3	$81.34	0.84%
NOVT	Novanta Inc Technology	NEW	244,260	NEW	$39,628,742	NEW	1	$144.62	0.82%
SKYW	Skywest Inc Industrials	Reduced	383,799	-8,700	$38,122,754	+5.8%	11	$67.69	0.79%
VIAV	Viavi Solutions Inc. Technology	Added	793,600	+200,400	$37,894,400	+92.0%	3	$25.27	0.78%
MOG-A	Moog Inc. Industrials	Added	86,735	+41,825	$36,761,762	+179.7%	2	$323.10	0.76%
LFUS	Littelfuse Inc Technology	Added	79,800	+8,000	$36,335,334	+49.1%	4	$277.55	0.75%
ARQT	Arcutis Biotherapeutics, Inc. Healthcare	Added	1,372,941	+7,000	$35,998,513	+11.9%	3	$25.56	0.74%
FCFS	FirstCash Holdings, Inc. Financial Services	Added	166,105	+440	$35,931,833	+15.4%	17	$133.31	0.74%
BLLN	BillionToOne, Inc. Healthcare	NEW	299,030	NEW	$35,877,619	NEW	1	$91.32	0.74%
DAN	DANA Inc Consumer Cyclical	Reduced	1,318,300	-293,200	$35,870,943	−33.9%	3	$26.26	0.74%
ESI	Element Solutions Inc Basic Materials	NEW	740,100	NEW	$35,339,775	NEW	1	$41.50	0.73%
AIR	Aar Corp Industrials	Added	246,325	+1,200	$35,207,232	+31.2%	6	$68.45	0.73%
RELY	Remitly Global, Inc. Technology	Added	1,570,400	+116,100	$35,192,664	+54.4%	5	$18.31	0.73%
ICUI	Icu Medical Inc Healthcare	Added	237,050	+33,340	$34,751,530	+32.1%	8	$146.01	0.72%
FSS	Federal Signal Corp Industrials	Added	269,084	+1,450	$34,574,603	+19.5%	16	$86.83	0.71%
OUST	Ouster, Inc. Technology	NEW	545,810	NEW	$34,124,041	NEW	1	$33.64	0.71%
LEVI	Levi Strauss & Co Consumer Cyclical	Added	1,358,100	+190,800	$33,721,623	+56.2%	4	$21.36	0.70%
MMSI	Merit Medical Systems Inc Healthcare	Added	473,409	+49,200	$32,826,180	+12.3%	19	$77.00	0.68%

Showing the top 50 of 174 positions. Create a free account to see every position, past quarters, search, filters and CSV export.

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.