Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (I.R.S. Employer Identification No.) One E. Washington Street, Suite 1400 Phoenix Arizona 85004 (Address of principal executive offices) (Zip Code) (602) 389-3500 (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2019 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the t ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ý Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2019 or o Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from__________ to __________ Commission file number: 001-32550 WESTERN ALLIANCE BANCORPORATION (Exact name of registrant as specified in its char ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 Commission file number: 001-32550 WESTERN ALLIANCE BANCORPORATION (Exact name of registrant as specified in its charter) Delaware 88-0365922 (State or other jurisdiction of incorporation or organization) One E. Washington Street Suite 1400, Phoenix, AZ 85004 (Address of principal ex ...