 Weill soon realized that he was not positioned to be named CEO and after the firm's merger with Lehman Brothers Kuhn Loeb, Weill chose to resign from American Express in August 1985.Weill would return to building a large financial services company of his own, which would become Citigroup and would go on to acquire the core Shearson brokerage business that he had built in the 1960s and 1970s.In 1984 American Express acquired the investment banking and trading firm, Lehman Brothers Kuhn Loeb, and added it to the Shearson family, creating Shearson Lehman/American Express.