<ACCESSION-NUMBER>0001212545-18-000131 <TYPE>8-K <PUBLIC-DOCUMENT-COUNT>20 <PERIOD>20180419 <ITEMS>2.02 <ITEMS>9.01 <FILING-DATE>20180419 <DATE-OF-FILING-DATE-CHANGE>20180419 <FILER> <COMPANY-DATA> <CONFORMED-NAME>WESTERN ALLIANCE BANCORPORATION <CIK>0001212545 <ASSIGNED-SIC>6022 <IRS-NUMBER>000000000 <STATE-OF-INCORPORATION>DE <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>8-K <ACT>34 <FILE-NUMBER>001-32550 <FILM-NUMBER>18764473 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>ONE E. WASHINGTON STREET <CITY>PHOENIX <STATE>AZ <ZIP>85004 <PHONE>602-389-3500 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>ONE E. WASHINGTON STREET <STREET2>SUITE 1400 <CITY>PHOENIX <STATE>AZ <ZIP>85004 </MAIL-ADDRESS> </FILER>