Reputable billionaire investors such as Jim Simons, Cliff Asness and David Tepper generate exorbitant profits for their wealthy accredited investors (a minimum of $1 million in investable assets would be required to invest in a hedge fund and most successful hedge funds won't accept your savings unless you commit at least $5 million) by pinpointing winning small-cap stocks. There is little or no publicly-available information at all on some of these small companies, which makes it hard for an individual investor to pin down a winner within the small-cap space.