Shares in five companies related to Alibaba end mixed on its debut trading day. Alibaba part-owner Yahoo closes down 3% after gaining 20% over the previous few months while SoftBank Corp., another major Alibaba shareholder, loses 1%. U.S. e-commerce rival Amazon ends 2% higher after an analyst raises his price target on the stock, EBay falls 0.5% and JD.com closes down 4%.