 How do you pick the next stock to invest in? One way would be to spend days of research browsing through thousands of publicly traded companies. However, an easier way is to look at the stocks that smart money investors are collectively bullish on. Hedge funds and other institutional investors usually invest large amounts of capital and have to conduct due diligence while choosing their next pick. They dont always get it right, but, on average, their stock picks historically generated strong returns after adjusting for known risk factors. With this in mind, lets take a look at the recent hedge fund activity surrounding Rubicon Technology, Inc. NASDAQ:RBCN. 