CHIWAN Wharf Holdings is to list on the Shenzhen Stock Exchange on May 5, becoming the first firm to float B shares since the riots last August. The company said in its B share listing document, issued on February 18, that it expected dealing to start on or before May 31. A representative of Standard Chartered Asia - international lead manager for the offer - said yesterday that the government and company had decided the date together. The port operator offered 46 million A shares at 3.1 yuan a share and 40 million B shares at $2.83 a share. The offer raised a combined 269.8 million yuan (about HK$366 million at official rates). The company operates Shenzhen's Chiwan harbour, including cargo handling and storage, and land and sea cargo transport. The company's B share offer was oversubscribed 48.04 times, tying up $5.55 billion.