Investor Presentaiton

Specialized, High Quality Loan Portfolio Diversified by product, client-type and geography emphasizing underwriting discipline 1Q23 Loans HFI by Product Type 1Q23 Loans HFI by Borrower Type . C&D Equity Fund 9% Other; Warehouse 1% Lending 10% Resources 2% ■Residential Municipal & Nonprofit 3% Tech & Innovation 5% C&D 33% 33% CRE, NOO 4% 9% ■CRE, OO ■C&I Residential 32% 21% $46.4 billion • Other C&I 13% CRE, 00 4% Hotel Franchise Finance 9% CRE, NOO 12% Accelerated growth in NBLs and Residential has contributed to loan diversification and evolution of strategy into low-to-no-loss loan categories ~66% of 3-year growth in low-to-no-loss categories Loans HFI and Yields 6.28% 5.43% 5.23% 5.18% 5.40% 5.62% 5.82% 5.83% Spot Rate 6.45% 4.79% 4.74% 4.32% $51.9 $46.4 $6.8 $27.1 $39.1 $8.4 $11.1 $13.2 $15.1 $17.7 $21.1 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 1Q23 Dollars in billions WA Western Alliance Bancorporation® Highlights • . Diverse mix of regionally-focused commercial banking divisions & nationally-oriented specialized businesses Leverages deep segment expertise to provide specialized banking services to niche markets across the country Segment-focused model supports superior client value and company risk management National reach enables selective relationships with highest asset quality and profitability 1Q23 Loans HFS (ex-AMH Resi) Composition ■ Other C&I 2% 8% 18% 23% Equity Fund Resources ■Syndications ■Mtg. WH 44% 6% CRE, NOO ■Residential Yields Average Spot Loans HFI 6.28% 6.45% Loans HFS N/A 7.34% HFS - AMH Resi 5.90% 6.33% | 12

View entire presentation