 The company's banking subsidiary BOKF, NA operates in 8 states under the brands Bank of Oklahoma, Bank of Texas, Bank of Albuquerque, and BOK Financial (in Arizona, Arkansas, Colorado, Kansas, and Missouri).It also operates TransFund, Cavanal Hill Investment Management, BOK Financial Securities and the Milestone Group.BOK Financial traces its roots to the Exchange National Bank of Tulsa, which was formed in 1910 when four oil investors bought the assets of the failed Farmers National Bank.