BOKF, History
The following are major historical events for BOKF, including mergers and acquisitions.
| 1910-02-10 | Institution established: Original name:National Bank of Tulsa | |
| 1975-07-01 | Changed name to Bank of Oklahoma, N. A. | |
| 1984-11-26 | Changed name to Bank of Oklahoma, Tulsa, National Association | |
| 1986-11-24 | Acquired Bank of Oklahoma, Oklahoma City, National Association (4166) in OKLAHOMA CITY, OK | |
| 1986-11-24 | Changed name to Bank of Oklahoma, National Association | |
| 1987-07-30 | Acquired The First National Bank of Yukon (4234) in YUKON, OK | |
| 1987-08-20 | Acquired American Exchange Bank & Trust Company (19164) in NORMAN, OK | |
| 1988-08-01 | Acquired Bank of Oklahoma Grove (16169) in GROVE, OK | |
| 1989-03-24 | Acquired American National Bank of Midwest City (18964) in MIDWEST CITY, OK | |
| 1989-10-13 | Acquired Bank of Oklahoma, Southwest Tulsa (22152) in TULSA, OK | |
| 1989-10-13 | Acquired Bank of Oklahoma, Lewis Center (15823) in TULSA, OK | |
| 1989-10-13 | Acquired Bank of Oklahoma, Broken Arrow, National Association (24714) in BROKEN ARROW, OK | |
| 1989-10-13 | Acquired Bank of Oklahoma, City Plaza (18288) in TULSA, OK | |
| 1989-11-30 | Acquired Bank of Oklahoma, Mercantile Center (18965) in TULSA, OK | |
| 1991-08-09 | Acquired Continental Federal Savings and Loan Association, F.A. (32680) in OKLAHOMA CITY, OK | |
| 1992-02-10 | Reorganized. | |
| 1992-07-16 | Acquired Bank of Oklahoma, National Association, South (26354) in OKLAHOMA CITY, OK | |
| 1993-05-10 | Acquired Sand Springs State Bank (12287) in SAND SPRINGS, OK | |
| 1993-05-10 | Acquired Brookside State Bank (16765) in TULSA, OK | |
| 1994-05-02 | Acquired Plaza National Bank of Bartlesville (18901) in BARTLESVILLE, OK | |
| 1994-10-07 | Acquired Northwest Bank of Enid (21734) in ENID, OK | |
| 1994-11-14 | Acquired Citizens Bank (4153) in MUSKOGEE, OK | |
| 1997-04-01 | Acquired BancOklahoma Trust Company (26669) in TULSA, OK | |
| 1999-10-15 | Acquired The First National Bank and Trust Company of Muskogee (4152) in MUSKOGEE, OK | |
| 2011-01-01 | Acquired Colorado State Bank and Trust, N. A. (1769) in DENVER, CO | |
| 2011-01-01 | Changed name to BOKF, National Association | |
| 2011-01-01 | Acquired Bank of Kansas City, National Association (12690) in OVERLAND PARK, KS | |
| 2011-01-01 | Acquired Bank of Albuquerque, National Association (34992) in ALBUQUERQUE, NM | |
| 2011-01-01 | Acquired Bank of Arizona, National Association (34002) in PHOENIX, AZ | |
| 2011-01-01 | Acquired Bank of Texas. National Association (21674) in DALLAS, TX | |
| 2011-01-01 | Acquired Bank of Arkansas, National Asssociation (33482) in FAYETTEVILLE, AR | |
| 2012-01-01 | Acquired Southwest Trust Company, National Association (33884) in OKLAHOMA CITY, OK | |
| 2014-03-01 | Acquired GTrust (33769) in TOPEKA, KS | |
| 2017-02-17 | Acquired Missouri Bank and Trust Company of Kansas City (9387) in KANSAS CITY, MO | |
| 2019-03-25 | Acquired CoBiz Bank (22683) in DENVER, CO |