A man walks over a bridge in front of the skyline of the Lujiazui Financial District in Pudong in Shanghai. After suffering through a 953 percent rally in shares of Yirendai Ltd. since mid-February, hedge funds and other bearish speculators were rewarded over the past four days as the Chinese peer-to-peer lender sank 35 percent in U.S. trading. Holding on to the trade has been especially costly after annualized borrowing rates for Yirendai...