UCB SA’s share price slumped after the U.S. FDA rejected the pharma’s filing for psoriasis drug Bimzelx (bimekizumab), citing issues with “inspection observations” that must be resolved before approval. Shares in Brussels-based UCB (Brussels:UCB) fell 13.6% following the announcement that the FDA had rejected Bimzelx for treatment of adults with moderate to severe plaque psoriasis.