Before the Bell-AmEx, Wells Fargo up 2 pct on Buffett comments

NEW YORK, Aug 22 (Reuters) - Shares of credit card company American Express Co (AXP.N) and U.S. bank Wells Fargo (WFC.N) gained more than 2 percent in premarket trade on Friday after billionaire investor Warren Buffett said it has added positions in one of those stocks during recent months.

Wells Fargo's shares gained 2.3 percent to $29.10 while American Express rose 2.1 percent to $37.80.

For details, see [ID:nWEN7619]. (Reporting by Walter Brandimarte; Editing by Chizu Nomiyama)