NEW YORK (AP) - Shares of Twitter are surging on a report that co-founder Jack Dorsey will step down as the company's chief executive.Twitter’s stock, which has consistently underperformed the market, jumped more than 10% at the opening bell Monday before trading was halted pending news.CNBC first reported that Dorsey may step down soon, citing anonymous sources.WASHINGTON, DC - OCTOBER 28: Twitter CEO Jack Dorsey testifies remotely during a Senate Commerce, Science, and Transportation Committee hearing with big tech companies October 28, 2020 on Capitol Hill in Washington, DC.