Investor Presentaiton

4th Quarter 2022 | Financial Highlights Highlights Earnings & Profitability Q4-22 Q3-22 Q4-21 Earnings per Share $2.67 $2.42 $2.32 Net Income EPS Net Income $293.0 $264.0 $246.0 Net Revenue $701.2 $663.9 $561.0 $293.0 million $2.67 Pre Provision Net Revenue¹ $367.8 $358.1 $323.2 Net Interest Margin 3.98% 3.78% 3.33% Efficiency Ratio¹ 46.9% 45.5% 41.8% PPNR1 ROAA 1.67% 1.53% 1.69% ROTCE¹ 27.0% 24.9% 25.8% Balance Sheet & Capital Total Loans $51,862 $52,201 $39,075 Total Deposits $53,644 $55,589 $47,612 CET1 Ratio 9.3% 8.7% 9.1% TCE Ratio¹ 6.5% 5.9% 7.3% Tangible Book Value per Share¹ $40.25 $37.16 $37.84 Asset Quality Provision for Credit losses $3.1 $28.5 $13.2 Net Charge-Offs (Recoveries) $1.8 $(1.9) $1.4 Net Charge-Offs (Recoveries) /Avg. Loans 0.01% (0.02)% 0.02% Q4: $367.8 million 14% YoY Loan Growth Q4: $(0.3) billion 28% YoY4 Tangible Book Value PER SHARE¹ $40.25 ROTCE/ (ex. AOCI)1 27.0% / 23.1% Deposit Growth Q4: $(1.9) billion 13% YoY NPAs²/ Total Assets Total Loan ACL/Funded HFI Loans³ NPAs2/Total Assets 0.69% 0.14% 0.68% 0.74% 0.14% 0.15% 0.15% 6% YoY Dollars in millions, except EPS 1) Refer to slide 2 for further discussion of Non-GAAP financial measures. WA Western Alliance 2) Nonperforming assets includes nonaccrual loans and repossessed assets. Bancorporation® 3) Ratio includes an allowance for credit losses of $21.9 million as of December 31, 2022 related to a $12.0 billion pool of loans covered under 5 separate credit linked notes. YoY loan growth excludes Early Buyout loans that were transferred from HFS to HFI during 2022, with a balance of $1.9 billion at December 31, 2022. 4

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