<P> BOK Financial's holdings include BOKF, NA, BOSC, Inc. and the Milestone Group . BOKF, NA operates TransFund, Cavanal Hill Investment Management and seven banking divisions: Bank of Albuquerque, Bank of Arizona, Bank of Arkansas, Bank of Kansas City, Bank of Oklahoma, Bank of Texas, and Colorado State Bank and Trust . BOKF, NA has full - service banks located in eight states . </P> <P> BOKF has a market value of approximately $3422 million USD as April 7, 2016 . </P> <P> BOK Financial traces its roots to the Exchange National Bank of Tulsa, which was formed in 1910 when four men bought the remains of the failed Farmers National Bank . One of the bank's major investors was Harry F. Sinclair, who became the bank's president . </P> <P> In 1917, Exchange National Bank of Tulsa began construction of a headquarters building in Tulsa at Third Street and Boston Avenue . In 1928, the bank constructed a 28 - story tower adjacent to the initial building . The combined structure, since renamed the 320 South Boston Building, remained the tallest building in Tulsa until 1967 . </P>

Bank of arizona a division of bokf national association