Mabwell Bioscience Co. Ltd. raised ¥3.48 billion ($547.9 million) in a Shanghai STAR Market IPO on Jan. 18 to support company R&D efforts and plans to build an antibody production plant. Though oversubscribed, the offering got a cool market reception, with shares plunging nearly 30% from a ¥32 open (US$27.96), then closing at ¥24.50 on the first day of trading before recovering slightly to ¥27.40 on Jan. 20.