(Bloomberg) -- Chinese investors are pulling back from Hong Kong’s stocks at the fastest pace in more than five years, threatening to deepen a selloff.Onshore traders have sold a net HK$24 billion ($3.1 billion) of Hong Kong shares through a trading link in October through Thursday, according to data compiled by Bloomberg, putting the month on track for the biggest outflow since 2021.Mainland investors have traditionally been staunch buyers of Hong Kong stocks, providing support during market downturns.