OBERWEIS ASSET MANAGEMENT INC/
Long book
$3.39B
Q1 2026
Positions
180
Top-10 weight
26%
concentration
Last quarter
+26.5%
SPY +14.8%
Turnover
21%
of book per quarter
Strategy in plain words
auto-generated from filingsOBERWEIS ASSET MANAGEMENT INC/ is an institutional manager, running a $3.39B US long book across 180 positions.
The portfolio is moderately concentrated (top 10 ≈ 26% of the book). Turnover is modest: positions are typically held for years. Current anchor positions: APPLIED OPTOELECTRONICS INC, LUMENTUM HOLDINGS INC, CREDO TECHNOLOGY GROUP HOLDI, DIGITALOCEAN HOLDINGS INC, SHARKNINJA INC.
Over the last 9 quarters its long book ran on average 2.3pp per quarter ahead of the S&P 500, beating the index in 6 of 9 quarters. Signal value of individual moves is limited — treat changes as weak evidence.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
+4.7%
Q2 2024
+6.7%
Q3 2024
-1.3%
Q4 2024
-11.7%
Q1 2025
+15.6%
Q2 2025
+10.9%
Q3 2025
+2.2%
Q4 2025
+7.7%
Q1 2026
+26.5%
Sector allocation
Technology 36%
Industrials 19%
Healthcare 17%
Services media 8%
Other 6%
Consumer discretionary 5%
Financials 5%
Energy 2%
Long book by quarter
What does OBERWEIS ASSET own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| AAOI APPLIED OPTOELECTRONICS INC | Technology | 2.3M | $198.8M | 5.9% | +15.2% |
| LITE LUMENTUM HOLDINGS INC | Technology | 266.2K | $187.1M | 5.5% | -5.2% |
| CRDO CREDO TECHNOLOGY GROUP HOLDI | Technology | 1.0M | $95.9M | 2.8% | +51.3% |
| DOCN DIGITALOCEAN HOLDINGS INC | Technology | 927.5K | $79.6M | 2.3% | +19.1% |
| SN SHARKNINJA INC | Industrials | 600.0K | $63.5M | 1.9% | +14.0% |
| NVMI NOVA LTD | Other | 138.0K | $59.9M | 1.8% | +21.8% |
| DAN DANA INC | Industrials | 1.6M | $54.2M | 1.6% | +102.3% |
| BTSG BRIGHTSPRING HEALTH SERVICES | Healthcare | 1.2M | $49.4M | 1.5% | +27.6% |
| MTSI MACOM TECHNOLOGY SOLUTIONS H | Technology | 215.9K | $47.9M | 1.4% | +20.6% |
| RMBS RAMBUS INC | Technology | 526.3K | $45.3M | 1.3% | +13.9% |
| CLH CLEAN HARBORS INC | Utilities | 144.4K | $41.4M | 1.2% | +23.5% |
| SITM SITIME CORP | Technology | 119.3K | $41.2M | 1.2% | +12.1% |
| UCTT ULTRA CLEAN HOLDINGS INC | Technology | 640.5K | $39.8M | 1.2% | +1.9% |
| ECG EVERUS CONSTRUCTION GROUP | Industrials | 326.5K | $38.6M | 1.1% | +25.7% |
| FTDR FRONTDOOR INC | Services media | 718.0K | $38.0M | 1.1% | +17.5% |
| CRS CARPENTER TECHNOLOGY | Industrials | 94.4K | $37.2M | 1.1% | +14.3% |
| SKYW SKYWEST INC | Industrials | 392.5K | $36.0M | 1.1% | +2.7% |
| LSCC LATTICE SEMICONDUCTOR CORP | Technology | 374.4K | $34.7M | 1.0% | +19.0% |
| GMED GLOBUS MEDICAL INC - A | Healthcare | 392.2K | $33.8M | 1.0% | +45.3% |
| CAMT CAMTEK LTD | Other | 222.8K | $33.8M | 1.0% | +1.8% |
| ARQT ARCUTIS BIOTHERAPEUTICS INC | Healthcare | 1.4M | $32.2M | 1.0% | +69.0% |
| FLS FLOWSERVE CORP | Industrials | 434.7K | $32.0M | 0.9% | +6.0% |
| LTH LIFE TIME GROUP HOLDINGS INC | Services media | 1.2M | $31.3M | 0.9% | +9.6% |
| RSI RUSH STREET INTERACTIVE INC | Services media | 1.4M | $31.2M | 0.9% | +1.6% |
| FCFS FIRSTCASH HOLDINGS INC | Consumer discretionary | 165.7K | $31.1M | 0.9% | +26.2% |
| FSLY FASTLY INC - CLASS A | Technology | 1.1M | $31.1M | 0.9% | +55.3% |
| TPC TUTOR PERINI CORP | Industrials | 393.9K | $30.4M | 0.9% | +1.7% |
| BROS DUTCH BROS INC-CLASS A | Consumer discretionary | 598.5K | $30.3M | 0.9% | +48.0% |
| SEI SOLARIS ENERGY INFRASTRUCTUR | Industrials | 531.9K | $30.1M | 0.9% | +45.0% |
| MMSI MERIT MEDICAL SYSTEMS INC | Healthcare | 424.2K | $29.2M | 0.9% | +57.8% |
| FSS FEDERAL SIGNAL CORP | Industrials | 267.6K | $28.9M | 0.9% | +60.7% |
| AMSC AMERICAN SUPERCONDUCTOR CORP | Industrials | 849.9K | $28.8M | 0.8% | +1.7% |
| MRCY MERCURY SYSTEMS INC | Technology | 391.0K | $28.5M | 0.8% | -5.6% |
| ACA ARCOSA INC | Industrials | 267.7K | $28.4M | 0.8% | +20.8% |
| OSIS OSI SYSTEMS INC | Technology | 106.6K | $28.3M | 0.8% | +5.1% |
| CNR CORE NATURAL RESOURCES INC | Materials | 269.8K | $28.3M | 0.8% | +51.2% |
| WAY WAYSTAR HOLDING CORP | Technology | 1.2M | $28.1M | 0.8% | +38.9% |
| EHC ENCOMPASS HEALTH CORP | Healthcare | 289.5K | $28.0M | 0.8% | -19.4% |
| VCYT VERACYTE INC | Healthcare | 839.8K | $27.1M | 0.8% | +15.6% |
| AIR AAR CORP | Industrials | 245.1K | $26.8M | 0.8% | -10.1% |
| ICUI ICU MEDICAL INC | Healthcare | 203.7K | $26.3M | 0.8% | +21.2% |
| LFUS LITTELFUSE INC | Industrials | 71.8K | $24.4M | 0.7% | +15.2% |
| PRIM PRIMORIS SERVICES CORP | Industrials | 166.1K | $23.8M | 0.7% | +1.7% |
| RELY REMITLY GLOBAL INC | Services media | 1.5M | $22.8M | 0.7% | +45.0% |
| G GENPACT LTD | Services media | 606.8K | $22.6M | 0.7% | +16.3% |
| AIZ ASSURANT INC | Financials | 102.3K | $22.3M | 0.7% | +23.3% |
| BLBD BLUE BIRD CORP | Industrials | 389.2K | $22.1M | 0.7% | +1.7% |
| IMAX IMAX CORP | Other | 577.1K | $21.9M | 0.6% | -11.5% |
| LEVI LEVI STRAUSS & CO- CLASS A | Other | 1.2M | $21.6M | 0.6% | +17.4% |
| ATEC ALPHATEC HOLDINGS INC | Healthcare | 1.9M | $20.8M | 0.6% | +90.8% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 15, 2026 | 180 | $3.39B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 17, 2026 | 179 | $2.73B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 17, 2025 | 183 | $2.61B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 14, 2025 | 185 | $2.30B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 15, 2025 | 192 | $2.01B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 14, 2025 | 196 | $2.12B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 14, 2024 | 206 | $1.95B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 14, 2024 | 197 | $1.63B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 15, 2024 | 196 | $1.38B | canonical | SEC ↗ |
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