The KBW Banks index, which includes about two dozen large banks including Bank of America, rose almost 15 percent. But investors remained on edge as Thursday's deadline neared. The Associated Press reported that Wells Fargo was asked to raise more capital after its stress test. Citigroup has also been identified as a bank needing to raise its capital buffer. The firm will need to boost its common equity by up to $10 billion, a person familiar with the matter said Monday. Bank of America, Wells Fargo and JPMorgan did not immediately respond late on Monday to a request for comment. An official from Citigroup declined comment. Ratings agency Standard & Poor's said it may lower the counterparty credit ratings of 22 financial firms – including Bank of America, Wells Fargo and Citigroup – based on results of its own stress testing. "These rating actions identify companies that we believe have at least a one-in-two likelihood of a … downgrade within 90 days," S&P said in a statement.