FBR Capital analyst Christopher James initiated coverage of Alexion Pharmaceuticals (ALXN) with an Underperform rating and $82 price target. The biotech focused on patients with ultra-rare disorders closed yesterday up $2.63 to $129.42. Alexion shares are overpriced as the company is facing a competitive near-term landscape, particularly from Alnylam's (ALNY) ALN-CC5, James tells investors in a research note. Further, near-term expansion into additional indications will be challenging given the recent failed study with eculizumab in refractory generalized myasthenia gravis, the analyst contends. He also sees possible pricing pressures from biosimilars, including an Amgen (AMGN) biosimilar product in development. James this morning also initiated Achillion Pharmaceuticals (ACHN) and Arena Pharmaceuticals (ARNA) with Outperform ratings.