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of Contents](#i62c2c22494624b44a91419e7668a0da2_7)\n\nUNITED STATES\n\nSECURITIES AND EXCHANGE COMMISSION\n\nWashington, D.C. 20549\n\nFORM 10-Q\n\n(Mark One)\n\n \n\n☒Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934\n\nFor the quarterly period ended March 31, 2026\n\nor\n\n☐Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934\n\nFor the transition period from__________ to __________\n\nCommission file number: 001-32550 \n\nWESTERN ALLIANCE BANCORPORATION\n\n(Exact name of registrant as specified in its charter)\n\n \n\nDelaware 88-0365922\n\n(State or other jurisdiction of\nincorporation or organization) (I.R.S. Employer\nIdentification No.)\n\nOne E. Washington Street, Suite 1400PhoenixArizona 85004\n\n(Address of principal executive offices) (Zip Code)\n\n(602) 389-3500\n\n(Registrant’s telephone number, including area code) \n\nSecurities registered pursuant to Section 12(b) of the Act:\n\nTitle of each classTrading\nSymbol(s)Name of each exchange\non which registered\n\nCommon Stock, $0.0001 Par ValueWALNew York Stock Exchange\n\nDepositary Shares, Each Representing a 1/400th Interest in a Share of\n\n4.250% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A\nWAL PrANew York Stock Exchange\n\nIndicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨\n\nIndicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ý    No  ¨\n\nIndicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” \"accelerated filer,\" \"smaller reporting company,\" and \"emerging growth company\" in Rule 12b-2 of the Exchange Act.\n\nLarge accelerated filer☒Accelerated filer☐\n\nNon accelerated filer☐Smaller reporting company☐\n\nEmerging growth company☐\n\nIf an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨ \n\nIndicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒\n\nAs of May 4, 2026, Western Alliance Bancorporation had 109,185,360 shares of common stock outstanding.\n\n[Table of Contents](#i62c2c22494624b44a91419e7668a0da2_7)\n\nINDEX\n\n \n\n  Page\n\n[Glossary of Entities and Terms](#i62c2c22494624b44a91419e7668a0da2_10)\n\n[3](#i62c2c22494624b44a91419e7668a0da2_10)\n\n[PART I. FINANCIAL INFORMATION](#i62c2c22494624b44a91419e7668a0da2_13)"}