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 Lending Other 4% C&D Other C&I 10% 20% Residential Warehouse 11% $4.2 Bn CRE, 1% Hotel 2% Owner CRE, Non-Owner Occupied 24% Occupied 28% NV 40.4% CA 21.9% AZ 17.0% Other 20.7% • Loan Portfolio: Q4 2022 National, specialized commercial bank Regional footprint Specialized C&I and institutional sponsor-backed developers 27% of Loans Credit Protected C&D 8% Equity Fund Resources 7% Municipal & Nonprofit Tech & 3% Innovation 4% Other C&I 14% $51.9 Bn Residential 31% Warehouse Lending 11% Hotel Franchise Finance 8% 37.0% CRE, Owner Occupied 3% CRE, Non- Owner Occupied 11% • CA AZ 8.2% NV 5.4% . Other 49.4% Deliberate, decade-long business transformation strategy . Nearly 70% of GFC losses from Q4-09 to Q4-12 came from categories comprising 44% of portfolio at Q4-09, which today makes up <6% of loans . Losses concentrated in Nevada and consumer lending during GFC Since year-end 2013, cumulative NCOs of $29mm vs total ACL of $357mm 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 5% National lending diversification: 21% to 49% CRE loan concentration reduction: 54% to 21% 53% of loans in low-to-no-loss categories today WA Western Alliance Bancorporation® 9

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