<ACCESSION-NUMBER>0001613665-18-000080 <TYPE>8-K <PUBLIC-DOCUMENT-COUNT>1 <PERIOD>20180914 <ITEMS>8.01 <FILING-DATE>20180917 <DATE-OF-FILING-DATE-CHANGE>20180914 <FILER> <COMPANY-DATA> <CONFORMED-NAME>Great Western Bancorp, Inc. <CIK>0001613665 <ASSIGNED-SIC>6022 <IRS-NUMBER>471308512 <STATE-OF-INCORPORATION>DE <FISCAL-YEAR-END>0930 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>8-K <ACT>34 <FILE-NUMBER>001-36688 <FILM-NUMBER>181071981 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>225 S. MAIN AVENUE <CITY>SIOUX FALLS <STATE>SD <ZIP>57104 <PHONE>605-334-2548 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>225 S. MAIN AVENUE <CITY>SIOUX FALLS <STATE>SD <ZIP>57104 </MAIL-ADDRESS> </FILER>