Didi, which was formed last year by the merger of two rival Chinese taxi-hailing apps, is backed by powerful domestic and foreign investors. Its lengthening list of investors includes two of China’s biggest internet companies—e-commerce company Alibaba Group Holding Ltd. and social-network company Tencent Holdings Ltd., as well as Apple. Tencent and Alibaba both put additional money into the latest fundraising round, according to people familiar with the situation, without disclosing the exact amount. Other big investors in the round included several Chinese banks and insurance companies that made investments of more than $100 million each, according to one of the people. Jean Liu, Didi's president, is the daughter of Liu Chuanzhi, the politically connected founder of Chinese computer maker Lenovo Group Ltd