The Hong Kong stock exchange has returned an IPO application sponsored by China’s leading investment bank, sending a strong signal of increased scrutiny. The listing application for Inner Mongolia Xingye Silver & Tin Mining, which is already listed on the A-share market in Shenzhen, was returned by Hong Kong Exchanges & Clearing (HKEX) on June 22, according to information released by the exchange operator on Thursday. It was the first initial public offering application to be returned in Hong...