China’s Ant Financial Services Group, e-commerce giant Alibaba Group Holding Ltd’s (BABA.N) internet finance affiliate, closed a private placement valuing the unit at about $45 billion, a person familiar with the matter said Thursday. Ant Financial sold stakes to external investors, including China Development Bank Capital Co and a holding company affiliated with David Yu, the co-founder of Alibaba Executive Chairman Jack Ma’s private equity firm Yunfeng Capital, the person said, adding that they did not know how much was raised.