Oberweis Asset Management Inc.: Q2 2026 Portfolio Activity Analysis
A detailed analysis of Oberweis AM's observable stock purchases and sales during the quarter ending June 30, 2026.
Oberweis Asset Management Inc. has shown significant activity in its portfolio during the second quarter of 2026, as evidenced by changes in holdings compared to the previous period. The firm manages a substantial portfolio valued at approximately $4.5 billion.
The analysis reveals notable shifts across various sectors. In the Technology space, Applied Optoelectronics Inc. (AAOI) stands out with a significant increase of 23.78% in its position during this quarter. Oberweis also initiated new positions or substantially increased holdings in several other companies.
Key purchases observed include: Applied Optoelectronics Inc., which saw a substantial 23.78% increase; Ouster, Inc. and Openlane, Inc. both entered the portfolio with new positions representing 100% increases from prior periods; and additions like SharkNinja, which increased by a modest 0.27%, though its allocation decreased slightly overall due to other factors.
Conversely, the data indicates several exits or reductions in Technology holdings this quarter. Rambus Inc. experienced a 100% increase but was not included in the top holdings list for June 2026; however, other Technology companies show decreases: Applied Optoelectronics saw its allocation drop by -23.78%, and Silicon Motion Techn ADR increased slightly but still showed a small decrease of 0.27% in portfolio weight.
In the Healthcare sector, Oberweis divested from several positions or reduced their allocations significantly during Q2 2026. Catalyst Pharmaceuticals saw a sharp decline of -62.38%, and exits were noted for Adaptive Biotechnologies (-55.99%) and Waystar Holding Corp. (-36.14%). These changes reflect a strategic shift away from certain Healthcare names this quarter.
The firm also demonstrated buying activity in other sectors, including Consumer Cyclical with new positions in Openlane and Trimas Corp., as well as Basic Materials through a 100% increase in Element Solutions, Inc. (ESI). Overall portfolio diversification remains evident from the sector allocation data provided.
For further details on Oberweis Asset Management's holdings and performance, please visit their institutional profile. Investors can explore specific stock information at company-specific pages.