Baron Funds money manager goes all in to beat the stock market By: MarketWatch October 18, 2017 at 11:09 AM EDT Alex Umansky makes concentrated bets — Amazon accounts for 15% of his Baron Fifth Avenue Growth Fund. By Michael Brush. Read More >> Related Stocks: Alibaba Group Holding Ltd Alphabet-A Alphabet-C Amazon.com Ctrip.com Intl Ltd Facebook MasterCard Microsoft Standard & Poors 500 Tesla, Inc. The Priceline Group Visa