Western Alliance Bancorporation Executive Stock and Bonus Deferral Plan Summary

Western Alliance Bancorporation has established the Executive Stock and Bonus Deferral Plan, an unfunded nonqualified deferred compensation plan. This plan allows select employees, generally limited to the Executive Leadership Team, to defer a portion of their annual cash bonus and certain stock compensation. Participants can elect to defer 0%, 25%, or 50% of their eligible compensation. Deferrals are credited as deferred stock units and remain subject to the original award's vesting schedule. Dividend equivalents are paid on deferred stock compensation if dividends are declared. Upon separation from service, deferred amounts will be paid in two or three annual installments based on the participant's election. In the event of death, the vested balance will be paid to the beneficiary in a lump sum. Deferred annual bonuses are subject to the company's Dodd-Frank Clawback Policy. The plan, effective December 19, 2025, is governed by Delaware law and is intended to comply with Section 409A of the Code.