) are higher on the session by 11.59%, trading at $1.54. Overall call volume is now running at 3.57x the daily average, with 50% of all calls traded being purchases on the offer. 2,778 contracts have traded on the session so far. Arena Pharmaceuticals, Inc. is a clinical-stage biopharmaceutical company focused on discovering, developing and commercializing oral drugs that target G protein-coupled receptors, in four major therapeutic areas: cardiovascular, central nervous system, inflammatory and metabolic diseases.