OBERWEIS ASSET MANAGEMENT INC/
Filing Date
Global Rank
#863
/ 8,622
▲ 150
· as of Mar 2026
Top Industry
Communication Equipment
12.6%
3Y Alpha vs SPY
-2.4%
Period ended 4 months ago
Filed May 15, 2026 · 2mo
25 quarters · since Mar 2020
Clone Performance
Jul 2023–Jul 2026 · vs SPYHypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.
Cloned portfolio
+55.8%
SPY
+67.9%
Annualised alpha
-2.9%
Max drawdown
−28.1%
Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. It tracks 100% of reported value on average across 13 quarters. Past performance does not predict future results.
Portfolio Concentration
176 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025Top Position
5.9%
+2.1 pts
Top 5
18.6%
+4.7 pts
Top 10
26.2%
+5.1 pts
HHI
144
Diversified+37
Portfolio Trend
25 quarters · across all stocks
Sector Breakdown
As of Mar 31, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Technology | 40.0% | $1,348,262,065 |
| Industrials | 18.9% | $635,462,202 |
| Healthcare | 18.0% | $605,246,562 |
| Consumer Cyclical | 12.5% | $419,950,562 |
| Financial Services | 4.3% | $144,332,468 |
| Energy | 3.5% | $117,630,839 |
| Communication Services | 1.4% | $47,898,359 |
| Consumer Defensive | 1.4% | $47,487,278 |
| Unclassified | 0.1% | $1,834,352 |
| Basic Materials | 0.0% | $522,238 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increased
25 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| ATEC | Alphatec Holdings, Inc. | +907,893 | 1,908,293 | $20,762,227 | |
| DAN | DANA Inc | +815,000 | 1,611,500 | $54,226,975 | |
| EVLV | Evolv Technologies Holdings, Inc. | +594,049 | 1,671,949 | $10,115,291 | |
| ARQT | Arcutis Biotherapeutics, Inc. | +557,541 | 1,365,941 | $32,181,569 | |
| RELY | Remitly Global, Inc. | +451,500 | 1,454,300 | $22,788,881 | |
| CRMD | CorMedix Inc. | +406,000 | 1,211,115 | $8,223,470 | |
| FSLY | Fastly, Inc. | +381,222 | 1,071,022 | $31,123,899 | |
| CRDO | Credo Technology Group Holding Ltd | +346,580 | 1,021,968 | $95,932,136 | |
| WAY | Waystar Holding Corp. | +326,874 | 1,167,474 | $28,147,798 | |
| AAOI | Applied Optoelectronics, Inc. | +310,328 | 2,349,969 | $198,783,877 | |
| BTSG | BrightSpring Health Services, Inc. | +250,970 | 1,158,970 | $49,383,711 | |
| SGHC | Super Group (SGHC) Ltd | +245,900 | 1,514,400 | $16,355,520 | |
| AEO | American Eagle Outfitters Inc | +230,400 | 1,044,900 | $17,449,830 | |
| ALHC | Alignment Healthcare, Inc. | +219,100 | 966,600 | $17,031,492 | |
| BROS | Dutch Bros Inc. | +193,993 | 598,493 | $30,319,655 | |
| CPRX | Catalyst Pharmaceuticals, Inc. | +193,600 | 780,570 | $19,326,913 | |
| LEVI | Levi Strauss & Co | +173,400 | 1,167,300 | $21,583,377 | |
| SEI | Solaris Energy Infrastructure, Inc. | +164,989 | 531,889 | $30,057,047 | |
| CLMB | Climb Global Solutions, Inc. | +159,880 | 211,840 | $4,198,668 | |
| MMSI | Merit Medical Systems Inc | +155,449 | 424,209 | $29,240,726 | |
| DOCN | DigitalOcean Holdings, Inc. | +148,675 | 927,505 | $79,561,378 | |
| MD | Pediatrix Medical Group, Inc. | +141,100 | 701,087 | $14,996,250 | |
| MIR | Mirion Technologies, Inc. | +136,467 | 744,267 | $13,835,923 | |
| VISN | Vistance Networks, Inc. | +131,100 | 1,092,012 | $19,874,618 | |
| GMED | Globus Medical Inc | +122,200 | 392,200 | $33,791,952 | |
| No positions match the current search. | |||||
Trimmed
Positions the filer reduced
19 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| FRSH | Freshworks Inc. | −1,996,720 | 57,750 | $463,732 | |
| WEAV | Weave Communications, Inc. | −926,250 | 72,830 | $336,474 | |
| AMBA | Ambarella Inc | −322,675 | 295,185 | $15,196,123 | |
| IBEX | IBEX Ltd | −231,600 | 10,200 | $273,564 | |
| LINC | Lincoln Educational Services Corp | −120,653 | 188,447 | $7,666,023 | |
| NYT | New York Times Co | −91,050 | 211,650 | $17,721,454 | |
| COCO | Vita Coco Company, Inc. | −77,292 | 156,108 | $7,479,134 | |
| IMAX | Imax Corp | −75,161 | 577,139 | $21,937,053 | |
| EHC | Encompass Health Corp | −69,486 | 289,485 | $28,001,884 | |
| AIR | Aar Corp | −27,575 | 245,125 | $26,831,382 | |
| MRCY | Mercury Systems Inc | −23,017 | 391,023 | $28,509,486 | |
| LITE | Lumentum Holdings Inc. | −14,708 | 266,222 | $187,090,172 | |
| POWL | Powell Industries Inc | −14,543 | 34,157 | $18,481,669 | |
| CECO | Ceco Environmental Corp | −10,476 | 135,032 | $8,045,206 | |
| FUTU | Futu Holdings Ltd | −6,500 | 4,500 | $615,420 | |
| MU | Micron Technology Inc | −3,800 | 700 | $236,488 | |
| WMT | Walmart Inc. | −50 | 2,137 | $265,586 | |
| BNY | Bank of New York Mellon Corp | −43 | 2,510 | $297,761 | |
| CAT | Caterpillar Inc | −40 | 408 | $289,051 | |
| No positions match the current search. | |||||
New Positions
Positions the filer opened this quarter
22 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| DRS | Leonardo DRS, Inc. | 449,500 | $20,011,740 | |
| INDV | Indivior Pharmaceuticals, Inc. | 653,413 | $19,916,028 | |
| CHYM | Chime Financial, Inc. | 1,035,530 | $19,395,476 | |
| HNGE | Hinge Health, Inc. | 465,766 | $17,959,936 | |
| NVST | Envista Holdings Corp | 665,400 | $16,881,198 | |
| SHAK | Shake Shack Inc. | 187,570 | $16,594,317 | |
| ARLO | Arlo Technologies, Inc. | 982,300 | $13,978,129 | |
| MOG-A | Moog Inc. | 44,910 | $13,142,462 | |
| ATEN | A10 Networks, Inc. | 504,300 | $11,659,416 | |
| SBCF | Seacoast Banking Corp Of Florida | 378,866 | $11,475,851 | |
| AMPX | Amprius Technologies, Inc. | 585,000 | $9,863,100 | |
| THR | Thermon Group Holdings, Inc. | 154,700 | $7,796,880 | |
| APEI | American Public Education Inc | 130,400 | $7,417,152 | |
| BW | Babcock & Wilcox Enterprises, Inc. | 500,200 | $7,347,938 | |
| KN | Knowles Corp | 234,200 | $6,014,256 | |
| CNXN | Pc Connection Inc | 96,200 | $5,623,852 | |
| BRCB | Black Rock Coffee Bar, Inc. | 365,600 | $4,723,552 | |
| RCKY | Rocky Brands, Inc. | 118,000 | $4,568,960 | |
| ACMR | ACM Research, Inc. | 13,000 | $511,550 | |
| XOM | ExxonMobil Holdings Corp | 1,303 | $221,066 | |
| FCX | Freeport-Mcmoran Inc | 3,590 | $211,020 | |
| MRK | Merck & Co., Inc. | 1,730 | $208,101 | |
| No positions match the current search. | ||||
Sold Out
Positions the filer fully exited
19 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| CARG | CarGurus, Inc. | 518,400 | $19,880,640 | |
| SXT | Sensient Technologies Corp | 188,000 | $17,662,600 | |
| GENI | Genius Sports Ltd | 1,585,900 | $17,476,618 | |
| ACIW | Aci Worldwide, Inc. | 330,702 | $15,810,862 | |
| CVLT | Commvault Systems Inc | 110,900 | $13,902,424 | |
| TPB | Turning Point Brands, Inc. | 103,500 | $11,219,400 | |
| WK | Workiva Inc | 127,500 | $10,996,875 | |
| GDOT | Green Dot Corp | 765,000 | $9,799,650 | |
| ATRC | AtriCure, Inc. | 217,992 | $8,623,763 | |
| BBW | Build-A-Bear Workshop Inc | 134,100 | $8,216,307 | |
| FRME | First Merchants Corp | 196,000 | $7,346,080 | |
| MBUU | Malibu Boats, Inc. | 244,100 | $6,886,061 | |
| HWKN | Hawkins Inc | 46,800 | $6,648,408 | |
| PGY | Pagaya Technologies Ltd. | 305,600 | $6,387,040 | |
| AIOT | Powerfleet, Inc. | 1,095,252 | $5,826,740 | |
| LYTS | Lsi Industries Inc | 173,400 | $3,176,688 | |
| MTRX | Matrix Service Co | 226,575 | $2,650,927 | |
| BLZE | Backblaze, Inc. | 552,023 | $2,572,427 | |
| SHOP | Shopify Inc. | 13,100 | $2,108,707 | |
| No positions match the current search. | ||||
176 positions ·
$3,368,626,925 total
· as of Mar 31, 2026
All sectors
Basic Materials
Communication Services
Consumer Cyclical
Consumer Defensive
Energy
Financial Services
Healthcare
Industrials
Technology
Showing 1–50
of 176 positions by value
· page 1 of 4
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| AAOI |
Applied Optoelectronics, Inc.
Technology
|
Added | 2,349,969 | $198,783,877 | 5.90% | |
| LITE |
Lumentum Holdings Inc.
Technology
|
Reduced | 266,222 | $187,090,172 | 5.55% | |
| CRDO |
Credo Technology Group Holding Ltd
Technology
|
Added | 1,021,968 | $95,932,136 | 2.85% | |
| DOCN |
DigitalOcean Holdings, Inc.
Technology
|
Added | 927,505 | $79,561,378 | 2.36% | |
| SN |
SharkNinja, Inc.
Consumer Cyclical
|
Added | 599,970 | $63,536,823 | 1.89% | |
| NVMI |
Nova Ltd.
Technology
|
Added | 137,955 | $59,911,097 | 1.78% | |
| DAN |
DANA Inc
Consumer Cyclical
|
Added | 1,611,500 | $54,226,975 | 1.61% | |
| BTSG |
BrightSpring Health Services, Inc.
Healthcare
|
Added | 1,158,970 | $49,383,711 | 1.47% | |
| MTSI |
MACOM Technology Solutions Holdings, Inc.
Technology
|
Added | 215,886 | $47,941,804 | 1.42% | |
| RMBS |
Rambus Inc
Technology
|
Added | 526,316 | $45,278,965 | 1.34% | |
| CLH |
Clean Harbors Inc
Industrials
|
Added | 144,355 | $41,390,909 | 1.23% | |
| SITM |
SITIME Corp
Technology
|
Added | 119,281 | $41,193,693 | 1.22% | |
| UCTT |
Ultra Clean Holdings, Inc.
Technology
|
Added | 640,476 | $39,824,797 | 1.18% | |
| ECG |
Everus Construction Group, Inc.
Industrials
|
Added | 326,533 | $38,550,485 | 1.14% | |
| FTDR |
Frontdoor, Inc.
Consumer Cyclical
|
Added | 717,960 | $37,951,365 | 1.13% | |
| CRS |
Carpenter Technology Corp
Industrials
|
Added | 94,433 | $37,220,766 | 1.10% | |
| SKYW |
Skywest Inc
Industrials
|
Added | 392,499 | $36,043,183 | 1.07% | |
| LSCC |
Lattice Semiconductor Corp
Technology
|
Added | 374,436 | $34,732,683 | 1.03% | |
| GMED |
Globus Medical Inc
Healthcare
|
Added | 392,200 | $33,791,952 | 1.00% | |
| CAMT |
Camtek Ltd
Technology
|
Added | 222,780 | $33,775,675 | 1.00% | |
| ARQT |
Arcutis Biotherapeutics, Inc.
Healthcare
|
Added | 1,365,941 | $32,181,569 | 0.96% | |
| FLS |
Flowserve Corp
Industrials
|
Added | 434,681 | $31,953,400 | 0.95% | |
| SIMO |
Silicon Motion Technology CORP
Technology
|
Added | 282,550 | $31,727,539 | 0.94% | |
| LTH |
Life Time Group Holdings, Inc.
Consumer Cyclical
|
Added | 1,160,500 | $31,263,870 | 0.93% | |
| RSI |
Rush Street Interactive, Inc.
Consumer Cyclical
|
Added | 1,434,560 | $31,201,680 | 0.93% | |
| FCFS |
FirstCash Holdings, Inc.
Financial Services
|
Added | 165,665 | $31,145,020 | 0.92% | |
| FSLY |
Fastly, Inc.
Technology
|
Added | 1,071,022 | $31,123,899 | 0.92% | |
| TPC |
Tutor Perini Corp
Industrials
|
Added | 393,900 | $30,405,141 | 0.90% | |
| BROS |
Dutch Bros Inc.
Consumer Cyclical
|
Added | 598,493 | $30,319,655 | 0.90% | |
| SEI |
Solaris Energy Infrastructure, Inc.
Energy
|
Added | 531,889 | $30,057,047 | 0.89% | |
| MMSI |
Merit Medical Systems Inc
Healthcare
|
Added | 424,209 | $29,240,726 | 0.87% | |
| FSS |
Federal Signal Corp /De/
Industrials
|
Added | 267,634 | $28,941,940 | 0.86% | |
| AMSC |
American Superconductor Corp /De/
Industrials
|
Added | 849,900 | $28,769,115 | 0.85% | |
| MRCY |
Mercury Systems Inc
Industrials
|
Reduced | 391,023 | $28,509,486 | 0.85% | |
| ACA |
Arcosa, Inc.
Industrials
|
Added | 267,700 | $28,413,678 | 0.84% | |
| OSIS |
Osi Systems Inc
Technology
|
Added | 106,593 | $28,301,507 | 0.84% | |
| CNR |
Core Natural Resources, Inc.
Energy
|
Added | 269,800 | $28,256,154 | 0.84% | |
| WAY |
Waystar Holding Corp.
Healthcare
|
Added | 1,167,474 | $28,147,798 | 0.84% | |
| EHC |
Encompass Health Corp
Healthcare
|
Reduced | 289,485 | $28,001,884 | 0.83% | |
| VCYT |
Veracyte, Inc.
Healthcare
|
Added | 839,834 | $27,051,053 | 0.80% | |
| AIR |
Aar Corp
Industrials
|
Reduced | 245,125 | $26,831,382 | 0.80% | |
| ICUI |
Icu Medical Inc/De
Healthcare
|
Added | 203,710 | $26,309,146 | 0.78% | |
| LFUS |
Littelfuse Inc /De
Technology
|
Added | 71,800 | $24,365,330 | 0.72% | |
| PRIM |
Primoris Services Corp
Industrials
|
Added | 166,100 | $23,758,944 | 0.71% | |
| RELY |
Remitly Global, Inc.
Technology
|
Added | 1,454,300 | $22,788,881 | 0.68% | |
| G |
Genpact LTD
Technology
|
Added | 606,832 | $22,604,492 | 0.67% | |
| AIZ |
Assurant, Inc.
Financial Services
|
Added | 102,300 | $22,281,963 | 0.66% | |
| BLBD |
Blue Bird Corp
Industrials
|
Added | 389,238 | $22,104,826 | 0.66% | |
| IMAX |
Imax Corp
Communication Services
|
Reduced | 577,139 | $21,937,053 | 0.65% | |
| LEVI |
Levi Strauss & Co
Consumer Cyclical
|
Added | 1,167,300 | $21,583,377 | 0.64% |