Shares of Warren Buffett’s Berkshire Hathaway (BRK-A) are down over 12% thus far in 2015 compared to a 3% drop in the S&P 500. Still, Daniel Beckerman, President of Beckerman Institutional at Covestor, said investors should not turn a blind eye to the Oracle of Omaha – or his proteges Todd Combs and Ted Weschler. 'If you look at their track records from when they ran their hedge funds, they really blew away the stock market indexes, so I am positive on their future,' said Beckerman, adding that Berkshire is a smart domestic play in a jittery global economy. Beckerman is also bullish on shares of Zillow (Z), which have been flat since the company split its stock three for one this summer. He said the online real estate company is integrating its Trulia acquisition and is making headway with millennials now searching for starter homes. 'They were smart enough to buyout their most viable competitor there and even after that acquisition they only control about 30% of their market,' said Beckerman. 'It’s a highly fragmented industry but because of their superior brand recognition they are growing their piece of the pie.' Beckerman said shares of The Greenbrier Companies (GBX) have fallen over 28% year-to-date due to 'perceived exposure to the energy industry.' However, he sees the railcar maker turning its fortunes around in coming months because it’s highly profitable and trades at a price earnings multiple of less than eight times its trailing 12 months earnings.