Citi has told clients that sharp falls in HSBC Holdings PLC (LSE:HSBA) and Standard Chartered PLC (LSE:STAN) shares appear excessive following a media report that some banks have suspended opening Hong Kong accounts for mainland Chinese customers. The pair were among a group of stocks, including Prudential and AIA that fell 5-8% on Thursday after the South China Morning Post reported on the account suspensions, a story subsequently picked up by Bloomberg.