Wells Fargo & Co. is a diversified financial services company with operations around the world. Wells Fargo is the fourth largest bank in the US by assets and the second largest bank by market cap. _It is the only bank in the United States to be rated AAA by S&P. Headquartered in San Francisco, California (its bank, Wells Fargo Bank, N.A., is legally chartered in Sioux Falls, South Dakota), Wells Fargo is a result of a merger between California-based Wells Fargo & Co. and Minneapolis-based Norwest Corporation in 1998. The new company chose to keep the name Wells Fargo, to capitalize on the 150-year history of the nationally-recognized Wells Fargo name and its trademark stagecoach.