Rentler took the top job at Ross in the middle of its fiscal 2014, which turned out to be a banner year for the off-price retailer. Sales, earnings, and operating margins all jumped, and in June it split its stock two-for-one. But in August, Rentler warned that the second half of 2015 could be challenging.

For more on Rentler, read “The best and worst stock performances of Most Powerful Women CEOs.”