Business Description

Organization Structure and Description of Services WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of customized loan, deposit, and treasury management capabilities, including funds transfer and other digital payment offerings through its wholly-owned banking subsidiary, WAB. Effective as of October 4, 2025, the Company completed its brand unity initiative, consolidating its legacy division bank brands: ABA, BON, FIB, Bridge, and TPB, under a single unified name, Western Alliance Bank. The Company also serves business customers through a national platform of specialized financial services, including mortgage banking services through AmeriHome and digital payment services for the class action legal industry. In addition, the Company has the following non-bank subsidiaries: CSI, a captive insurance company formed and licensed under the laws of the state of Arizona and established as part of the Company's overall enterprise risk management strategy and WATC, which provides corporate trust services and levered loan administration solutions. WAL also has unconsolidated subsidiaries used as business trusts in connection with issuance of trust-preferred securities as described in "Note 12. Qualifying Debt" in Item 8 of this Form 10-K. Bank Subsidiary At December 31, 2025, WAL has the following bank subsidiary: Bank Name Headquarters Location Cities Total Assets Net Loans Deposits (in millions) Western Alliance Bank Phoenix, Arizona Arizona: Chandler, Flagstaff, Gilbert, Mesa, Phoenix, Scottsdale, and Tucson $ 92,736 $ 61,714 $ 77,639 Nevada: Carson City, Fallon, Henderson, Las Vegas, Mesquite, Reno, and Sparks California: Beverly Hills, Carlsbad, Costa Mesa, Irvine, La Mesa, Los Angeles, Oakland, Pleasanton, San Diego, San Francisco, San Jose, and Woodland Hills Other: Atlanta, Georgia; Austin, Houston, and Irving, Texas; Boston, Massachusetts; Chicago, Illinois; Columbus, Ohio; Denver, Colorado; Minneapolis, Minnesota; New York, New York; Seattle, Washington; and Tysons, Virginia WAB has the following operating subsidiaries: • WABT holds certain investment securities, municipal and non-profit loans, and leases. • WA PWI holds interests in certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations. • BW Real Estate, Inc. operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities. • Helios Prime, Inc. holds interests in certain limited partnerships invested in renewable energy projects. • Western Finance Company purchases and originates equipment finance leases and provides mortgage banking services through its wholly-owned subsidiary, AmeriHome. • DST provides digital payments services for the class action legal industry. Market Segments The Company's operating segments are aggregated with a focus on products and services offered and consist of three