Though most of the stocks in the fund's portfolio delivered strong returns, some stocks listed on the American stock exchange outperformed. Below, we have highlighted those five best-performing stocks in the ETF with their respective positions in the fund's basket: Best-Performing Stocks of TAN Enphase Energy Inc. ( ENPH - Free Report ) : The stock has skyrocketed more than 269% in the first half. It has seen a positive earnings estimate revision of 18 cents for this year over the past three months with an expected earnings growth rate of 420%.