Investor Presentaiton

Geography Composition Characteristics Highlights Business Transformation Deliberate business transformation emphasizes underwriting specialization and diversification strategy, which sustains superior asset quality Loan Portfolio: 2010 Community banking focused Nevada concentrated Local business C&I and HNW developers Other 4% • Loan Portfolio: 1Q23 National, specialized commercial bank Regional footprint Specialized C&l and institutional sponsor-backed developers C&D 10% Other C&I 20% Equity Fund Resources 2% C&D 9% Municipal Other & Nonprofit Tech & 1% 3% Innovation 5% Other C&I 13% Residential Warehouse Lending 11% 1% Hotel 2% $4.2 Bn CRE, Owner Occupied 28% CRE, Non-Owner Occupied 24% NV 40.4% CA 21.9% AZ 17.0% Other 20.7% 25% of Residential 32% Loans Credit Protected $46.4 Bn Warehouse Lending 10% Hotel Franchise Finance 9% CA 38.8% AZ 9.4% NV 6.0% Other 45.8% CRE, Owner Occupied 4% CRE, Non- Owner Occupied 12% • • • Deliberate, decade-long business transformation strategy • Nearly 70% of GFC losses from 4Q09 to 4Q12 came from categories comprising 44% of portfolio at 4Q09, which today makes up <6% of loans • Losses concentrated in Nevada and consumer lending during GFC Since year-end 2013, cumulative NCOs of $35mm vs total ACL of $350mm today • No quarterly NCO >$8.2mm (13bps) Diverse mix of regionally-focused commercial banking divisions and nationally-oriented, specialized businesses • • • National reach and deep segment expertise enables selective relationships with strong counterparties, leading profitability and superior company risk management Nevada loan concentration reduction: 40% to 6% National lending diversification: 21% to 46% CRE loan concentration reduction: 54% to 25% 50% of loans in low-to-no-loss categories today WA Western Alliance Bancorporation® 26 26

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