(Reuters) – Shares in the biggest U.S. banks were rising on Friday after they all passed the Federal Reserve’s annual health check — but Bank of America shares underperformed after the test implied it needs a larger-than-expected increase to its capital buffer, which could limit resources for share buybacks. While the broader equity market rallied on Friday, U.S. shares of UBS Group AG and Credit Suisse Group AG were outperforming, along with Wells Fargo & Co, among the group of 34 financial institutions that underwent the Fed’s so-called stress test. While all the companies easily passed, the…