Investor Presentaiton

Significant Access to Liquidity & Funding Capacity Source In-Use Remaining Capacity Total Available Liquidity As of 5/12/23 1. Cash $0 + $2.6B = $2.6B 2. FHLB $7.9B + $3.7B = $11.6B • 3. Fed Discount Window $0 + $16.2B = $16.2B 4. Fed BTFP $1.3B + $0.05B = $1.35B Total $9.2B + $22.6B = $31.8B Significant Available Liquidity $3.7 $2.6 $9.2 $16.2 $0.1 $31.8 1Q23 Investment Portfolio 13% Low Inc. Housing Spot Rate 4.60% 15% Private MBS 20% Agency MBS 9% Muni 27% CLOS 16% Other Outstanding Borrowings Cash FHLB Fed Discount Window Other Capacity Total Liquidity Available $9.1 billion Dollars in billions, unless otherwise indicated WA Western Alliance Bancorporation® Highlights • • • Repaid all borrowings from Federal Reserve discount window by 3/31 . Higher advance rates at FRB's discount window available, if necessary Ample access to contingent liquidity (as of 5/12) On-Balance Sheet Cash: $2.6 billion • • • . Total Unused Borrowing Capacity: $20.0 billion Total Unused Funding Capacity: $22.6 billion Total Available Liquidity: $31.8 billion Continue to evaluate additional opportunities to establish secured borrowing facilities Proceeds from contracted and planned asset sales will be used to pay down BTFP borrowings to $0 and reduce FHLB borrowings to normalized levels of ~$5B New deposit growth will be used to reduce wholesale funding costs and build HQLA investment balance || 19

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