Xiaomi Corp. and some existing investors raised $4.7 billion after pricing a Hong Kong initial public offering at the low end of a marketed range, a person with knowledge of the matter said. The Beijing-based smartphone maker priced the sale of 2.18 billion shares at HK$17 each, the person said, asking not to be identified because the details are private. Xiaomi had offered the shares at HK$17 to HK$22 apiece. The pricing values Xiaomi at about $54 billion, roughly half the company’s initial goal.