Bitmain’s filing to list its initial public offering (IPO) on the Hong Kong Stock Exchange (HKEx) will seemingly reach the end of its six-month expiration window today, as a Dovey Wan noted on Twitter. HKEx listing rules create a six-month window for any application to proceed to Listing Committee hearings. Bitmain's filed on September 26, 2018 and has apparently reached the end of HKEx approval window without confirmed reports of a Committee hearing, which would render the application obsolete.