BOK Financial Corporation is a US-based financial services holding company in the West South Central States region of the United States with 4,800 employees and operations in ten states, servicing clients around the country. Headquartered in the BOK Tower in downtown Tulsa, Oklahoma, the company began as an energy bank more than 100 years ago during the early-century oil boom. Today, it maintains its strength in the energy sector, but has successfully diversified into a variety of industries, businesses and geographies - all of which provide footing for its steady financial position. BOK Financials 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. BOKF has a market value of approximately $3422 million USD as April 7, 2016.