<ACCESSION-NUMBER>0000875357-18-000054 <TYPE>11-K <PUBLIC-DOCUMENT-COUNT>2 <PERIOD>20171231 <FILING-DATE>20180628 <DATE-OF-FILING-DATE-CHANGE>20180628 <FILER> <COMPANY-DATA> <CONFORMED-NAME>BOK FINANCIAL CORP ET AL <CIK>0000875357 <ASSIGNED-SIC>6021 <IRS-NUMBER>731373454 <STATE-OF-INCORPORATION>OK <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>11-K <ACT>34 <FILE-NUMBER>001-37811 <FILM-NUMBER>18926445 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>BANK OF OKLAHOMA TOWER <STREET2>BOSTON AVENUE AT SECOND STREET <CITY>TULSA <STATE>OK <ZIP>74172 <PHONE>9185886000 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>BANK OF OKLAHOMA TOWER <STREET2>P O BOX 2300 <CITY>TULSA <STATE>OK <ZIP>74192 </MAIL-ADDRESS> </FILER>