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The reporting person undertakes to provide to Western Alliance Bancorporation, any security holder of Western Alliance Bancorporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Mary Mack"}],"balance_after":2500,"source":{"system":"sec-edgar","filing":"0001212545-17-000097","document":"wf-form4_148728146542063.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1212545/000121254517000097/wf-form4_148728146542063.xml","form_type":"4"}},{"id":4442233,"issuer":{"id":3616,"kind":"organization","name":"WESTERN ALLIANCE BANCORPORATION","symbol":"WAL"},"owners":[{"id":160501,"kind":"person","name":"MACK CARY","position":1,"cik":"0001331621","reported_name":"MACK CARY","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-02-16T21:44:39.000Z","date":"2017-02-15","kind":"sale","acquired":false,"shares":1000,"price":53.15,"value":53150.0,"ownership":{"direct":false,"nature":"As custodian for son"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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