1y return+63.7%S&P 500 +20.9%
3y return+93.8%S&P 500 +68.5%
5y return+80.5%S&P 500 +74.5%
10y return+363.8%S&P 500 +256.5%
These returns are for its stock picks as disclosed on Form 13F: last quarter's holdings, valued at this quarter's prices. They miss trades within each quarter, short positions, options, bonds, cash and fees, so they aren't the returns its clients got.
$100 invested in its stock picks
Since June 30, 2016: $464 against $357 in the S&P 500.2
Oberweis Asset Management Inc/S&P 500 (SPY)
Top holdings
At the end of June 30, 2026. Change is in shares since the quarter before.2
| Stock | Value | Share of portfolio | Change |
|---|---|---|---|
| Credo Technology GroupCUSIP G25457105 | $275.6M | 5.7% | |
| AAOIApplied Optoelectronics Inc. | $265.4M | 5.5% | −23.8% |
| DOCNDigitalOcean Holdings, Inc. | $146.0M | 3.0% | |
| SIMOSilicon Motion Techn ADR | $105.4M | 2.2% | +12.0% |
| UCTTUltra Clean Holdings | $92.3M | 1.9% | +1.1% |
| SharkNinja, Inc.CUSIP G8068L108 | $90.4M | 1.9% | −1.1% |
| SITMSiTime Corporation | $89.1M | 1.8% | |
| BTSGBrightSpring Health Services | $82.7M | 1.7% | +2.3% |
| HNGEHinge Health, Inc. | $71.0M | 1.5% | +83.7% |
| RMBSRambus, Inc | $70.0M | 1.4% | |
| MTSIMacom Technology Solutions | $68.2M | 1.4% | −16.9% |
| LITELumentum Hldgs, Inc. | $61.9M | 1.3% | −72.9% |
| LSCCLattice Semiconductor Corporat | $59.9M | 1.2% | +4.6% |
| Nova Ltd.CUSIP M7516K103 | $59.0M | 1.2% | −21.2% |
| CRSCarpenter Technology Corp. | $57.5M | 1.2% | −1.2% |
| FTDRFrontdoor, Inc. | $55.8M | 1.2% | |
| ECGEverus Construction Group | $54.5M | 1.1% | |
| VCYTVeracyte, Inc. | $51.5M | 1.1% | +4.5% |
| POWLPowell Industries Inc. | $51.4M | 1.1% | +75.2% |
| LTHLife Time Holdings, Inc. | $48.6M | 1.0% | +2.5% |
| RSIRush Street Interactive, Inc. | $48.4M | 1.0% | +13.5% |
| MRCYMercury Systems, Inc. | $48.0M | 1.0% | |
| BROSDutch Bros., Inc. | $47.1M | 1.0% | +9.6% |
| CLHClean Harbors, Inc. | $45.9M | 0.9% | +6.3% |
| SEISolaris Energy Infrastructur | $45.4M | 0.9% | +6.1% |
Best picks still held
How each current holding has done since the quarter it first appeared in its filings (up to six years back).
| Stock | Held since | Return since | Now worth |
|---|---|---|---|
| AAOIApplied Optoelectronics Inc. | September 30, 2023 | +1250.6% | $265.4M |
| Camtek, Ltd.CUSIP M20791105 | June 30, 2020 | +1196.7% | $41.3M |
| Credo Technology GroupCUSIP G25457105 | March 31, 2024 | +1183.4% | $275.6M |
| POWLPowell Industries Inc. | September 30, 2023 | +936.3% | $51.4M |
| LITELumentum Hldgs, Inc. | June 30, 2025 | +802.7% | $61.9M |
| CRSCarpenter Technology Corp. | December 31, 2023 | +771.2% | $57.5M |
| UCTTUltra Clean Holdings | June 30, 2020 | +530.1% | $92.3M |
| SIMOSilicon Motion Techn ADR | December 31, 2023 | +444.0% | $105.4M |
| RSIRush Street Interactive, Inc. | March 31, 2024 | +356.8% | $48.4M |
| CLHClean Harbors, Inc. | December 31, 2020 | +292.6% | $45.9M |
Sold off last quarter
- FLSFlowserve Corporation was $32.0M
- PRIMPrimoris Services Corp. was $23.8M
- Genpact Ltd.CUSIP G3922B107 was $22.6M
- ATECAlphatec Hldgs Inc. was $20.8M
- EYENational Vision Holdings, Inc. was $20.7M
- PEGAPegasystems Inc. was $19.4M
- AEOAmerican Eagle Outfitters was $17.4M
- WGSGenedx Holdings Corp. was $16.8M
- SHAKShake Shack, Inc. was $16.6M
- MIRMirion Technologies, Inc. was $13.8M
Quarter by quarter
| Quarter | Its picks | S&P 500 |
|---|---|---|
| June 30, 2026 | +34.4% | +14.8% |
| March 31, 2026 | +7.6% | −4.6% |
| December 31, 2025 | +2.1% | +2.4% |
| September 30, 2025 | +10.9% | +7.8% |
| June 30, 2025 | +15.6% | +10.5% |
| March 31, 2025 | −11.5% | −4.6% |
| December 31, 2024 | −1.1% | +2.1% |
| September 30, 2024 | +5.6% | +5.4% |
| June 30, 2024 | +4.0% | +4.0% |
| March 31, 2024 | +5.5% | +10.0% |
| December 31, 2023 | +7.8% | +11.2% |
| September 30, 2023 | −6.4% | −3.6% |
| June 30, 2023 | +5.1% | +8.3% |
| March 31, 2023 | +14.3% | +7.0% |
| December 31, 2022 | +9.6% | +7.1% |
| September 30, 2022 | −3.4% | −5.3% |
| June 30, 2022 | −21.0% | −16.5% |
| March 31, 2022 | −14.4% | −4.9% |
| December 31, 2021 | +6.1% | +10.7% |
| September 30, 2021 | +2.1% | +0.3% |
Sources
Every number on this page points here. Each one links to the public record.
- 1SEC EDGAR: Oberweis Asset Management Inc/ Form 13F filingshttps://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=937886&type=13F-HR&dateb=&owner=include&count=40CIK 937886
- 2SEC: 13F for the quarter ended June 30, 2026https://www.sec.gov/Archives/edgar/data/937886/000121390026089777/Filed August 14, 2026 · accession 0001213900-26-089777