Baidu Inc. shares jumped by the most in more than three years in Hong Kong as optimism over its AI chip potential grows. The stock soared 16% in Hong Kong, the most since March 2022 and adding $6.4 billion in market value. The surge came after Arete Research Services LLP lifted its rating on Baidu’s American depositary receipts to buy from sell — it had held the only sell recommendation on the stock since it downgraded it last May. Most Read from Bloomberg Other analysts at firms including Citigroup I ...