Hong Kong Exchanges and Clearing rose for an eighth consecutive session, despite the government's claim that it did not plan to buy more shares in the company. The stock rose as much as 13.32 per cent before closing at HK$238.40, which was 8.76 per cent higher than its previous closing price. Turnover was HK$5.97 billion. HKEx said in a statement yesterday that it was not aware of any reason for the increase in stock price and trading volume. 'There are no negotiations or agreements relating to intended acquisitions or realisations which are discloseable under rule 13.23 of the rules governing the listing of securities of HKEx,' the statement said. Shares of HKEx have gained more than 170 per cent this year, partly helped by Beijing's announcement of the so-called through-train scheme to allow mainland investors to invest in Hong Kong stocks directly, as it would boost the exchange's trading fee income.