The gap in stock prices for dual-listed Chinese companies trading on the mainland and in Hong Kong has widened to a near one-year high, as state-backed support and renewed enthusiasm for artificial intelligence bolsters sentiment on yuan-traded stocks. Shares of the 202 dual-listed companies traded on mainland China’s exchanges – known to investors as A shares – averaged a 23 per cent premium over their Hong Kong equivalents, called H shares, according to a Hang Seng gauge tracking the price...