Investor Presentaiton

1st Quarter 2023 | Financial Highlights Highlights Earnings & Profitability EPS / Adjusted¹ Net Income / Adjusted¹ 1Q23 4Q22 Q1-22 $1.28/$2.30 $2.67 $2.22 Net Income EPS $142.2/$251.9 $293.0 $240.1 Net Revenue / Adjusted¹ $551.9/$712.2 $701.2 $555.8 Pre-Provision Net Revenue¹ $351.6 $367.9 $306.9 $142.2 million $251.9, adjusted $1.28 $2.30, adjusted Net Interest Margin 3.79% 3.98% 3.32% Efficiency Ratio / Adjusted 1 62.1% / 43.2% 46.9% 44.1% ROAA / Adjusted¹ 0.81% 1.43% 1.67% 1.64% ROTCE, Adjusted¹ 21.9% 27.7% 23.9% PPNR1 Q1: $351.6 million 15% YoY ROTCE, adjusted¹ 21.9% Balance Sheet & Capital Total Loans $46,435 $51,862 $41,119 Total Deposits $47,587 $53,644 $52,160 CET1 Ratio 9.4% 9.3% 9.0% TCE Ratio¹ 6.5% 6.5% 6.7% Tangible Book Value per Share¹ $41.56 $40.25 $37.13 Asset Quality Provision for Credit losses $19.4 $3.1 $9.0 Net Loan Charge-Offs $6.0 $1.8 $0.2 Loan Growth Q1: $(5.4) billion 13% YOY Tangible Book Value PER SHARE¹ Deposit Growth Q1: $(6.1) billion (9)% YoY NPAs²/ Total Assets Net Loan Charge-Offs/Avg. Loans 0.05% 0.01% 0.00% Total Loan ACL/Funded HFI Loans³ 0.75% 0.69% 0.73% NPAS²/Total Assets 0.17% 0.14% 0.17% $41.56 12% YoY 0.17% Dollars in millions, except EPS WA Western Alliance Bancorporation® Refer to slide 2 for further discussion of Non-GAAP financial measures. 2) Nonperforming assets includes nonaccrual loans and repossessed assets. Ratio includes an allowance for credit losses of $20.8 million as of March 31, 2023 related to a pool of loans covered under 4 separate credit linked notes. CO 6

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