Investor Presentaiton

Western Alliance Bancorporation Overview The Bank for All Seasons A national banking platform of specialized financial services paired with attractive regional markets provides complementary, diversified revenue streams and high operating leverage to produce industry-leading financial results Summary NYSE Headquarters WAL Phoenix, AZ IPO Market Cap¹ 2005 $8.2bn Offices 56 Serving a wide range of commercial and consumer related clients nationwide, from corporate and small business to public and non-profit borrowers Diversified business model provides flexibility and responsiveness to changing winds and market conditions to provide long-term superior risk- adjusted returns BANK DIRECTOR S&P GLOBAL MI FORBES One of Forbes' "America's Best Banks" Year After Year AMERICAN BANKER #1 Bank Above $50B, #1 Best Emerging 2022 Regional Bank & Top 10 U.S. Banks for Growth Strategy #2 Best-Performing of the 50 Largest Public U.S. Banks, 2021 INSTITUTIONAL INVESTOR MAG 2022 All-America Executive Team Best CEO & Best CFO Total Assets $67.7bn NPAs/Assets³ 0.14% LTM NCOs/ Avg. Loans 0.00% Employees 3,300+ LTM PPNR Growth 25.7% LTM ROTCE² 25.4% TBV per Share 5-Year CAGR 16.2% WA Western Alliance Bancorporation® Note: Financial data as of December 31, 2022; 1) Market data as of February 10, 2023; 2) Refer to slide 2 for further discussion of Non-GAAP financial measures. 3) Nonperforming assets includes nonaccrual loans and repossessed assets || 3

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