Fast-fashion retailer Shein Global Holdings is planning to take investor orders for its Hong Kong initial public offering (IPO) as soon as next week, aiming for a valuation of US$35 billion, according to people familiar with the matter.The Singapore-headquartered company, which was founded in China, aims to raise as much as US$2.8 billion and began gauging investor demand last week, said sources who asked not to be identified while discussing confidential information.The timing and size of the...