Investor Presentaiton

Highlights QTD Capital Update & Projected Build by June 30 CET1 Ratio 9.32% 0.23% -0.06% 0.12% -0.10% 9.38% Achieved 9.7% CET1 at 4/30 0.51% -0.18% ☐ Additional 2Q23 Capital Generation 2023 Target CET1 >10% • Strong organic capital generation drove net CET1 increase in 1Q23 and allowed us to raise liquidity through other B/S actions HFS reclassification in 1Q23 optimizes RWA and positions for stronger capital build going forward through asset sales (with a material amount under contract) -0.12% Net 17 bps increase Net 2 bps increase Net 33 bps increase Locked-in CET1 Build 9.71% 4Q22 HFI Reclass. to HFS Asset Sales CLN (WH) Unwind Organic B/S Capital Growth Generation 1Q23 Asset Sales CLN (EFR) Unwind 1 2 A Dollars in billions, unless otherwise indicated WA Western Alliance Bancorporation® HFS Loan Sales (Planned) & RWA Release Organic Capital Generation + B/S Growth 2 B 2 C 2Q23 Target • . HFS loan sales provide capital benefit through RWA release Loan marks taken on reclassified HFS loans provide confidence of expected capital benefit from planned sales 1H23 completed and planned actions and organic capital generation accelerate attainment of >10% capital goal by 2Q23 9

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