Before we spend days researching a stock idea we'd like to take a look at how hedge funds and billionaire investors recently traded that stock. S&P 500 Index ETF (SPY) lost 2.6% in the first two months of the second quarter. Ten out of 11 industry groups in the S&P 500 Index lost value in May. The average return of a randomly picked stock in the index was even worse (-3.6%). This means you (or a monkey throwing a dart) have less than an even chance of beating the market by randomly picking a stock.