Chinese artificial intelligence startup MiniMax has secured Alibaba Group Holding Ltd. and Abu Dhabi Investment Authority as key backers in its upcoming initial public offering in Hong Kong, according to people familiar with the matter. MiniMax is seeking to raise more than $600 million from the IPO, according to the people, who asked not to be identified because the information is private. It is set to start taking investor orders as early as Wednesday for a listing in January, some of them sa...