U.S. regional bank stocks fall as investor fears persist
May 12 (Reuters) – Shares of major U.S. regional lenders were mostly lower on Friday, underscoring continued investor uncertainty about the financial stability of mid-sized banks. Comerica Inc (CMA.N), Fifth Third Bancorp (FITB.O) and KeyCorp (KEY.N) fell 3.7%, 1.1% and nearly 2%, respectively. PacWest Bancorp (PACW.O), which lost 23% on Thursday after reporting a decline…