This stock picker continues to outperform by using volatility as a ‘friend’ By: MarketWatch February 12, 2019 at 11:11 AM EST Amy Zhang of the Alger Small-Cap Focus Fund gives an update on her holdings. Read More >> Related Stocks: Abiomed Inc Bio-Techne Corp Cantel Medical Caredx Inc Inogen Inc Medidata Solutions Shopify Inc Tandem Diabetes Care Veeva Systems Inc