 In fact, modern bonds often appoint many different financial institutions to have special roles, based on their area of expertise (such as corporate trustee with an expertise in bankruptcy who is only called in if the company stops paying back the bond).Financial institutions receive fees for their services.Large corporate trust providers include BOK Financial Corporation, U.S. Bank, Citi, Deutsche Bank, The Bank of New York Mellon, Wells Fargo, One Investment Group and BNP Paribas Securities Services .