Investor Presentaiton

Specialized, High Quality Loan Portfolio Diversified by product, client-type and geography emphasizing underwriting discipline Loans by Product Type Loans by Borrower Type Municipal & Nonprofit 3% Tech & Innovation 4% Equity Fund Resources C&D 8% Warehouse Lending 11% ■Resi. & Consumer 7% 31% ■Const. & Land 40% ■CRE, NOO ■CRE, OO 8% ■C&I Residential 31% 3% 18% • Other C&I 14% CRE, 00 3% Hotel Franchise Finance 8% CRE, NOO 11% 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 Sources of Loan Growth (1Q20 - 4Q22) Loans and Loan Yields Loan CAGR 5.43% 5.23% 5.18% 5.40% 5.62% 5.82% 5.83% 4.79% 4.74% WAL 25.3% $6.8 $27.1 4.32% $39.1 $51.9 $8.4 $11.1 $13.2 $15.1 $17.7 $21.1 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 Peers¹ Median: 13.0% Top Quart.: 14.7% • Dollars in billions WA Western Alliance Bancorporation® 16% Regional Banking 16% Other NBLS 12% Warehouse 11% Lending EFR 45% Residential Accelerated growth in NBLs and Residential has contributed to loan diversification and evolution of strategy into low-to- no-loss loan categories ~68% of 3-year growth in low-to-no-loss categories 1) Peers consist of 33 publicly traded banks headquartered in the US with total assets between $25B and $150B, excluding target banks of pending acquisitions, as of December 31, 2022; Source: S&P Global Market Intelligence. | 10

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