U.S. stock futures advanced on Wednesday following Tuesday’s mixed close. Futures of major benchmark indices were higher.Among the big banks that reported on Tuesday, surpassing analyst expectations were Wells Fargo & Co. (NYSE:WFC), Citigroup Inc. (NYSE:C), JPMorgan Chase & Co. (NYSE:JPM), and Goldman Sachs Group Inc. (NYSE:GS).Investors are awaiting earnings results from Bank of America Corp. (NYSE:BAC), Morgan Stanley (NYSE:MS), and Abbott Laboratories (NYSE:ABT) today.Meanwhile, the futures were rejoici ...