# EDGAR Filing Document

**Accession Number:** 0001212545
**File Stem:** 0001628280-26-033850
**Filing Date:** 2026-5
**Character Count:** 101115
**Document Hash:** ab808ca5da580c1c1d0f294f8c3aff33
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-26-033850.hdr.sgml**: 20260512

**ACCESSION NUMBER**: 0001628280-26-033850

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 138

**CONFORMED PERIOD OF REPORT**: 20260512

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260512

**DATE AS OF CHANGE**: 20260512

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WESTERN ALLIANCE BANCORPORATION
- **CENTRAL INDEX KEY:** 0001212545
- **STANDARD INDUSTRIAL CLASSIFICATION:** STATE COMMERCIAL BANKS [6022]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-32550
- **FILM NUMBER:** 26965783

**BUSINESS ADDRESS:**
- **STREET 1:** ONE E. WASHINGTON STREET
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85004
- **BUSINESS PHONE:** 602-389-3500

**MAIL ADDRESS:**
- **STREET 1:** ONE E. WASHINGTON STREET
- **STREET 2:** SUITE 1400
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85004

?xml version='1.0' encoding='ASCII'? wal-20260512

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 8-K** 

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the**

**Securities Exchange Act of 1934**

Date of Report (Date of earliest event reported): May 12, 2026

**WESTERN ALLIANCE BANCORPORATION** 

(Exact name of registrant as specified in its charter)

Delaware 001-32550 88-0365922 <br> (State or other jurisdictionof incorporation) (CommissionFile Number) (IRS EmployerIdentification No.)

One E. Washington Street, Phoenix, Arizona 85004

(Address of principal executive offices)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (Zip Code)

(602) 389-3500

(Registrant's telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

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| | | |
|:---|:---|:---|
| Title of each class | Trading Symbol(s) | Name of each exchange on which registered |
| Common Stock, $0.0001 Par Value | WAL | New York Stock Exchange |
| Depositary Shares, Each Representing a 1/400<sup>th</sup> Interest in a Share of <br>4.250% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A | WAL PrA | New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

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**ITEM 7.01. Regulation FD Disclosure.**

Western Alliance Bancorporation (the "Company") intends to discuss the information contained in the presentation attached hereto as Exhibit 99.1, which is incorporated herein by reference, at its Investor Day event at 8:30 a.m. ET on Tuesday, May 12, 2026 in New York, NY.

Participants may access the event conference line by dialing 1-646-931-3860, using meeting code 85304590502# and passcode 553075# or via live audio webcast using the website link https://westernalliance2026ird.q4web.com. The webcast is also available via the Company's website at www.westernalliancebancorporation.com. Participants should log in at least 15 minutes early to receive instructions. The call will be recorded and made available for replay.

The information in this Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, nor shall it be deemed subject to the requirements of amended Item 10 of Regulation S-K, nor shall it be deemed incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof, regardless of any general incorporation language in such filing. The furnishing of this information hereby shall not be deemed an admission as to the materiality of any such information.

**ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS.**

**(d) Exhibits.**

99.1 <u>[Investor Presentation](wal_investordayx2026xfin.htm)</u> <br> 104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | |
|:---|:---|
| | WESTERN ALLIANCE BANCORPORATION<br>(Registrant)<br>/s/ Vishal Idnani |
| | Vishal Idnani |
| | Chief Financial Officer |
| Date: | May 12, 2026 |

---

## Exhibit 99.1

![](wal_investordayx2026xfin001.jpg)

Investor Day 2026 Where Diversification Meets Innovation MAY 12, 2026

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2 Forward-Looking Statements and Non-GAAP Financials This presentation contains forward-looking statements that relate to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and similar expressions concerning matters that are not historical facts. Examples of forward-looking statements include, among others, statements we make regarding our expectations with regard to our business, financial and operating results, future economic performance, dividends and future plans and strategies, including our statements on the slide entitled "Management Outlook." The forward-looking statements contained herein reflect our current views about future events and financial performance and are subject to risks, uncertainties, assumptions and changes in circumstances that may cause our actual results to differ significantly from historical results and those expressed in any forward-looking statement. Some factors that could cause actual results to differ materially from historical or expected results include, among others: the risk factors discussed in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, and the Company's subsequent Quarterly Reports on Form 10-Q, each as filed with the Securities and Exchange Commission; adverse developments in the financial services industry generally and any related impact on depositor behavior; risks related to the sufficiency of liquidity; changes in international trade policies, tariffs and treaties affecting imports and exports, trade disputes, barriers to trade or the emergence of other trade restrictions, and their related impacts on macroeconomic conditions and customer behavior; the potential adverse effects of unusual and infrequently occurring events and any governmental or societal responses thereto; changes in general economic conditions, either nationally or locally in the areas in which we conduct or will conduct our business; the impact on financial markets from geopolitical conflicts such as the wars in Ukraine, Iran, and the Middle East; inflation, interest rate, market and monetary fluctuations; increases in competitive pressures among financial institutions and businesses offering similar products and services; higher defaults on our loan portfolio than we expect; increased foreclosures and ownership of real property; changes in management's estimate of the adequacy of the allowance for credit losses; technological risks and developments and cyber threats, attacks or events; emerging external focus among regulators and other officials related to risks in connection with the development and use of artificial intelligence; legislative or regulatory changes or changes in accounting principles, policies or guidelines; supervisory actions by regulatory agencies which may limit our ability to pursue certain growth opportunities, including expansion through acquisitions; additional regulatory requirements resulting from our continued growth; management's estimates and projections of interest rates and interest rate policy; the execution of our business plan; the outcome of legal proceedings regarding the Cantor Group V loan and the Leucadia Asset Management LLC loan, the amount of funds and/or collateral that may be available for the repayment of such loans, and any adverse economic or other events impacting the collateral, borrower or guarantors with respect to such loans; and other factors affecting the financial services industry generally or the banking industry in particular. Any forward-looking statement made by us in this presentation is based only on information currently available to us and speaks only as of the date on which it is made. We do not intend and disclaim any duty or obligation to update or revise any industry information or forward-looking statements, whether written or oral, that may be made from time to time, set forth in this presentation to reflect new information, future events or otherwise, except to the extent required by federal securities laws. In light of these risks, uncertainties and assumptions, the forward-looking events in this presentation might not occur, and you should not put undue reliance on any forward-looking statements. Non-GAAP Financial Measures This presentation contains both financial measures based on GAAP and non-GAAP based financial measures, which are used where management believes them to be helpful in understanding the Company's results of operations or financial position. Where non-GAAP financial measures are used, the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found in the Company's press releases announcing earnings as of and for the quarters ended December 31, 2025, and March 31, 2026, respectively. These disclosures should not be viewed as a substitute for operating results determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies.

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3 Executives in Attendance Tim Boothe Chief Administration Officer Barbara Kennedy Chief Human Resource Officer Jessica Jarvi Chief Legal Officer Ken Vecchione President & Chief Executive Officer Dale Gibbons Vice Chairman & Chief Banking Officer Tim Bruckner Chief Banking Officer Emily Nachlas Chief Risk Officer Lynne Herndon Chief Credit Officer Josh Adler CEO, AmeriHome David Bernard Specialized Mortgage Services Francesca Castagnola Juris Banking Brent Edgecumbe Lender Finance David Fragale Digital Asset Group Craig Huntington HOA Banking Heather Kelly Business Escrow Services Bob LaMantia Specialty Deposits Mike Lederman Innovation Banking Jocelyn Lynch Corporate Trust John Radwanski Treasurer Sonny Sonnenstein Chief Information Officer Nick Wanat Chief Audit Executive Senior Executives in AttendanceExecutive Leadership Team Vishal Idnani Chief Financial Officer

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![](wal_investordayx2026xfin004.jpg)

4 Board of Directors \* Retiring in June 2026 Experienced Board delivering sound strategic guidance to support long-term value creation Bruce Beach Chairman Mary Chris Jammet Dr. Michael Papay Juan R. Figuereo Chair, Audit Marianne Boyd Johnson Bryan K. Segedi Christopher A. Halmy Chair, Finance & Investment Anthony Meola Ken Vecchione President & CEO Greta Guggenheim Robert P. Latta Chair, Compensation Clarke Starnes III Howard N. Gould\* Chair, Risk Mary Tuuk Kuras\* Donald D. Snyder Chair, Governance

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![](wal_investordayx2026xfin005.jpg)

5 8:30 AM Company & Strategy Overview Ken Vecchione 9:00 AM Deposit Initiatives • Spotlight: HOA Banking (Craig Lee Huntington) Dale Gibbons 9:20 AM Q&A 9:30 AM BREAK 9:40 AM Commercial Banking • Spotlight: Innovation Banking (Mike Lederman) Tim Bruckner 10:00 AM Lender Finance & Corporate Trust Brent Edgecumbe & Jocelyn Lynch 10:20 AM Mortgage Banking • Spotlight: AmeriHome (Josh Adler) David Bernard 10:40 AM Q&A 10:50 AM BREAK 11:00 AM Risk Management & Credit Emily Nachlas & Lynne Herndon 11:20 AM Technology Sonny Sonnenstein 11:35 AM Financial Outlook Vishal Idnani 12:05 PM BREAK 12:15 PM Q&A 12:45 PM Luncheon with the Executive Team Investor Day Agenda

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6 Company & Strategy Overview Ken Vecchione President & Chief Executive Officer

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![](wal_investordayx2026xfin007.jpg)

7 Western Alliance is a premier national commercial bank with durable earnings and superior growth Loans (HFI)$59Bn 50.2% 2025 Adjusted Efficiency Ratio2 Disciplined Growth and Efficiency 2025 Growth Loans (HFI)9.3% Total Assets$99Bn 75% Commercial Loans / Loans (HFI) 50 States with Commercial Relationships Scaled National Commercial Bank1 ROATCE215.3% ROAA1.12% 23.1% EPS Growth Industry Leading Profitability Metrics Loan (HFI)-to- Deposit Ratio71% Total Capital$9BnDeposits$83Bn Fortified Balance Sheet and Liquidity Note: Balance sheet data as of March 31, 2026; profitability and efficiency data for FY 2025; adjusted efficiency ratio reflects removal of deposit fees 1. AZ state-chartered bank, member Federal Reserve Bank of San Francisco 2. Reflects non-GAAP financial measure; the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found in the Company's Annual Report on Form 10-K for the year ended December 31, 2025

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![](wal_investordayx2026xfin008.jpg)

8 $99Bn1 Built through disciplined, primarily organic growth 1994 Founded as Bank West of Nevada 2002 Acquired by WAL investors to expand regionally < $1Bn 2005 IPO 2021 AmeriHome acquisition $50Bn Nevada Community Bank 1994 – 2002 Regional Bank 2003 – 2009 Regional Bank with National Reach 2010 – 2017 Premier National Commercial Bank 2018 onwards 2026 2022 Digital Disbursements acquisition $25Bn 2019 2015 Bridge Bank acquisition 2016 Hotel Finance acquisition 2014 $10Bn 2010 $5Bn Homeowners Assoc. Banking launched 2009 Specialized Mortgage Services launched $1.3Bn Assets $2.0Bn Assets $1.2Bn Purchase Price Expected to Exceed $100Bn in 2026 1. Asset data as of March 31, 2026

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9 $4,900 $3,496 $2,778 $2,206 $701 $603 $549 $297 $285 $236 $228 $215 $189 $161 $123 $99 $88 $87 $86 $84 Assets ($Bn) Scaled with purpose, 16th largest publicly traded U.S. Commercial Bank by Assets Note: Data as of March 31, 2026. Represents publicly traded, U.S. headquartered commercial banks excluding trust banks (Bank of New York Mellon, State Street), investment banks (Goldman Sachs, Morgan Stanley), and specialty banks (Capital One, Synchrony, Ally) 1. Webster Financial Corp. announced sale to Banco Santander, S.A. on February 3, 2026 1

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10 31% 25%7% 8% 14% 15% Diversified, relationship-driven model supports stability and growth 24% 16% 60% Deposit Mix Loan (HFI) Mix Commercial Banking Community, Specialty, CRE 37% Deposit Initiatives - Specialty Escrow1 (15%) - HOA (14%) - Consumer Digital (8%) Commercial Banking Mortgage Banking $82.7Bn $59.1Bn Note: Data as of March 31, 2026. Percentages may differ due to rounding 1. Specialty Escrow includes: Business Escrow Services, Corporate Trust, Juris Banking, and others 2. Commercial Loans include Commercial Banking and Mortgage Banking 75% Commercial Loans2 Residential Mortgages 1 – 4 Family Mortgage Banking Warehouse, MSROther

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![](wal_investordayx2026xfin011.jpg)

11 National franchise with broad client reach 1. Dots represent town or city location of our commercial clients 2. Data as of March 31, 2026 3. West (PacNW/Mtn.): AK, CO, HI, ID, MT, OR, UT, WA, WY; Southeast: AL, AR, DC, DE, FL, GA, KY, LA, MS, NC, SC, TN, VA, WV; Northeast: CT, MA, MD, ME, NH, NJ, NY, PA, RI, VT; Midwest: IA, IL, IN, KS, MI, MN, MO, ND, NE, OH, SD, WI; Texas (& OK/NM): TX, OK, NM 4. Totals may not match due to rounding. Does not include consumer digital deposits or residential mortgages Commercial Relationships by Geography ($Bn)2 Region3 Loans (HFI) Deposits California $13 $18 Nevada $2 $11 Arizona $5 $9 Southeast $8 $11 Midwest $4 $11 Northeast $9 $8 Texas (& OK/NM) $3 $4 West (PacNW/Mtn.) $2 $3 Total Commercial4 $44 $76 Consumer $15 $7 Total $59 $83Commercial Client Relationships1 States w/ Commercial Branch Network States w/ Loan Production Offices

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![](wal_investordayx2026xfin012.jpg)

12 HOA Banking Leading HOA Bank in the U.S. 44,000+ HOA clients nationwide AmeriHome #2 Correspondent Mortgage Lender Top-tier mortgage platform — proprietary tech, national scale Innovation Banking Leading Bank Serving the Innovation Economy Trusted partner to venture-backed and emerging-growth companies – team average industry experience of 25 years CLO Trustee #6 Largest CLO Trustee in the U.S. Deep structured credit relationships across institutional capital markets Hotel Franchise Finance #4 Hotel & Lodging Lender Nationally Cycle-tested hospitality credit with specialized underwriting Digital Disbursements Innovation of the Year — American Banker 2025 Anti-fraud, data-driven digital payment infrastructure Digital Assets 24/7 Intrabank Transfer Infrastructure Early-mover in banking digital clients Named in Best SME Bank 2026 Named in America's Best Banks 2025 Named in Top Performing Banks 2026 Leadership in high-value specialty markets Leadership in high-value specialty markets Note: HOA clients per Fact Book's total count of HOAs; AmeriHome ranking per Inside Mortgage Finance for FY 2025; CLO Trustee ranking per Green Street's 2025 US CLO New Issue Trustee Rankings; Hotel Franchise Finance ranking per S&P Global Market Intelligence based on Lodging Outstanding Exposure as of Q4 2025

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![](wal_investordayx2026xfin013.jpg)

13 Highly differentiated businesses where diversification meets innovation Highly differentiated businesses where diversification meets innovation Commercial Banking Relationship & Expertise-Based AmeriHome Correspondent Mortgage Platform Corporate Trust as a Specialized Funding Platform Countercyclical earnings hedge • Correspondent mortgage originations & servicing • Secondary-market capabilities Inter-connectivity across national mortgage ecosystem • Retail relationships via MSR provide early refi market access Institutional capabilities beyond the core bank • Real-time collateral visibility that provides direct oversight of cash flows Targeted client relationships • Compounding fee economics and high retention rates • State-of-the-art technology platform Narrow and deep client focus • Community Banking • Hotel Franchise • Builder Finance • Innovation Banking • HOA Emerging, expertise-driven verticals • Ent. & Media • Food & Agriculture • Aero. & Defense • Healthcare • Gaming Specialty Commercial • Specialty Escrow deposits

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14 Determine implementation strategy Build policies, underwriting frameworks and establish leadership and operating model Leverage technology as a key enabler by identifying and deploying solutions that support client business models Launch at controlled scale Closely monitor and refine credit quality, deposit flows, and controls Accelerate the model once proven Responsibly scale clients, balances, and profitability Business becomes a repeatable contributor to enterprise growth Compound value Identify established industry verticals with underserved growth potential Assess client needs, market gaps in alignment with Western Alliance's risk appetite Evaluate Build Launch Scale A disciplined framework for launching and scaling durable business lines The S-curve growth engine: from idea to scaled growth

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![](wal_investordayx2026xfin015.jpg)

15 A market leading, deposit-rich vertical fortified by a deep and growing client base and continued innovation 2013 2025 HOA Services Deposit Growth ~$11Bn HOA Deposits Industry-leading HOA Bank in the US Sustained outperformance and growth S-curve momentum driven by new clients and wallet share Technology-driven focus powers success Technology-first model with new products and workflow integration Consistent market leading HOA services Launched in 2010 Note: Data as of December 31, 2025 Flagship deposit S-curve: HOA Banking ~$11BnDeposit CAGR

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![](wal_investordayx2026xfin016.jpg)

16 Disciplined S-curve deposit strategy driving scalable, durable funding Our approach 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 New lines are seasoned before scaling Focus on underserved markets High-touch, relationship-driven model Technology-driven products and services Note: Data as of December 31, 2025; CAGR calculated based on first year of reported deposits, which may not reflect actual inception date of business 1. CAGR from 2013-2025 2. CAGR from 2015-2025 3. CAGR from 2017-2025 HOA Services (2010) 25% CAGR1 Business Banking (2009) 8% CAGR1 Innovation Banking (2015) 19% CAGR2 Mortgage Banking (2009) 40% CAGR3 Juris Banking (2018) 59% CAGR Bus. Escrow Services (2019) 79% CAGR Digital Asset Banking (2022) 313% CAGR Corporate Trust (2023) 165% CAGR Consumer Digital (2023) 52% CAGR Deposit CAGR 2025

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![](wal_investordayx2026xfin017.jpg)

17 S-curve lending vertical demonstrates how innovation and diversification can produce scalable, capital-efficient returns 2012 2025 Resort Finance Loan Growth2 Note: Data as of December 31, 2025 1. Reflects non-GAAP financial measure; calculated as the sum of net interest income and non-interest income less expenses before adjusting for loss provisions 2. Resort Finance lending established FY 2012 $0.0 Bn $0.2 Bn $0.4 Bn $0.6 Bn $0.8 Bn $1.0 Bn $1.2 Bn $1.4 Bn $1.6 Bn $1.8 Bn $2.0 Bn $1.8Bn Loan Balance ~66% PPNR1 CAGR What we look for Few Competitors – Limited competition in the market Low-to-No Credit Losses – Minimal risk of credit losses High Operating Leverage – Ability to scale operation efficiently Pricing Stability – Consistent and predictable pricing Flagship lending S-curve: Resort Finance ~$1.8Bn

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18 Disciplined S-curve lending strategy sustaining high-return performance Our approach 2016 20222015 202320192018 202420212017 20252020 New lines are seasoned before scaling Focus on underserved markets High-touch, relationship-driven model Establish deep sector expertise Note: Data as of December 31, 2025; CAGR calculated based on first year of reported loans, which may not reflect actual inception date of business Lender Finance (2012) 32% CAGR Municipal Finance (2009) 43% CAGR Mortgage Banking (2009) 52% CAGR Resort Finance (2012) 72% CAGR Innovation Banking (2015) 17% CAGR Institutional CRE (2013) 21% CAGR Hotel Franchise (2016) 15% CAGR Builder Finance (2020) 32% CAGR Specialty Commercial & Community Banking (2009) 24% CAGR Loan CAGR

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19 10 12 14 16 18 20 0 10 20 30 40 Industry leading growth and returns driving long-term value creation 2025 PPNR2 YoY Growth (%) 2 0 2 5 R O A T C E 2 (%) Superior tangible book value2 growthTop-tier growth with strong returns1 Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Source: S&P Global Market Intelligence 1. Peers materially affected by M&A are excluded from this analysis 2. Reflects non-GAAP financial measure; the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found in the Company's Annual Report on Form 10-K for the year ended December 31, 2025 108% 389% 2015 '16 '17 '18 '19 '20 '21 '22 '23 '24 2025 Peer Median WALPeer Median Our 10-Year TBVPS growth of 17% reinforces the credibility of executing our long-term strategy throughout cycles 17% TBVPS CAGR (Q1-16 to Q1-26) ~3.6x

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20 Leading long-term Total Shareholder Return vs. peers 15-Year TSR Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Market data as of April 30, 2026. Source: S&P Global Market Intelligence. WAL's TSR has outperformed peers' by >3.4x over the last 15 years 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 WAL Peer Median 1,036% 301%

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21 Sustained credit discipline supports durable performance Classified Loans / Loans (HFI) Note: Data as of March 31, 2026. NCO inclusive of Q1 2026 fraud-related charge-offs 1. Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Source: S&P Global Market Intelligence Net Charge-Offs / Average LoansCriticized Loans / Loans (HFI) 5 year 10 year 1.5% 2.6% 2.3% 4.3% 22bps 10bps 18bps 17bps Western Alliance Peer Median1

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22 Engineered for growth Why we win: Differentiated client model with disciplined execution One bank, broad capability Technology-backed service Timely decision makingSpecialist, not generalist • Wide range of solutions across lending, deposits, and payments • Senior management develops deep relationships with largest clients • Digital and data capabilities enhance client experience • Focused on a defined set of high- value commercial verticals • Repeatable S-curve expansion scales new businesses with discipline • Deep expertise and client relationships that are difficult to replicate • Purpose-built platforms and teams create a durable competitive moat Built to outperform

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23 Expectation of top quartile growth and returns Medium-term financial guidance Six visible strategic drivers underpin our confidence Return on Average Tangible Common Equity1 16% – 17% Return on Average Assets 1.20% – 1.30% Adjusted Efficiency Ratio1 ~48% Growing commercial banking market share in high-growth regions through expertise, footprint, and target products Geographic Expansion 1 Scaling escrow and custodial deposits to drive diversified, low-cost funding and margin expansion Deposit Franchise1 AmeriHome countercyclical model positioned to capture volume, boost margins, and sustain earnings as rates fall Mortgage Banking Flywheel 1 Continued focus on fees generated through commercial banking, treasury management and digital disbursement services Fee Income Growth1 Continued favorable operating leverage enabled by efficiency gains Operating Leverage1 S-curve approach has been thoroughly tested, demonstrating consistent and reliable performance S-Curve Strategy1 1. Reflects non-GAAP financial measure

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24 Key Messages 1 Commercial banking model built to scale National platform anchored in specialized verticals drives consistent growth and top-tier returns 2 Specialty focused and product specific deposit verticals are a structural advantage Technology-enabled deposits across targeted sectors deliver durable, scalable, low-cost funding 3 Mortgage banking flywheel adds diversified earnings power AmeriHome platform enhances client acquisition, fee income, and countercyclical performance 4 Disciplined risk & credit management Prepared to cross $100Bn in 2026; specialty knowledge and expertise is a durable competitive advantage 5 Technology-enabled platform accelerates speed and efficiency Technology powers faster execution, scalable client service, and operating leverage across verticals 6 High-quality franchise with compelling valuation Fortified balance sheet, strong earnings momentum, peer leading PPNR and TBV growth, with clear path to 16% - 17% ROATCE 7 Experienced leadership team Seasoned and tested management team with a proven track record, demonstrated resilience, and expertise across economic cycles

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25 Deposit Initiatives Dale Gibbons Vice Chairman & Chief Banking Officer

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26 Key Messages Purpose-built technology and digital integrations enable client business growth Scalable infrastructure enables business expansion without proportional cost growth Disciplined execution across deposit verticals drive a repeatable growth model Embedded client relationships and value-added services drive stickier deposits

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27 Deposit Initiatives represent the largest growth driver of our overall deposit base 1.82% Cost of Deposits1 51% Deposit Growth Share2 19% Fee Income Note: Data as of March 31, 2026 1. Cost of Deposits for Q1 2026 is comprised of HOA Banking, Juris Banking, Digital Asset Group, Corporate Trust, Business Escrow Services (excludes Consumer Digital), and does not include ECR costs 2. Deposit Growth Share is the proportion of bank-wide deposit growth in 2025 contributed by Deposit Initiatives 37% Deposits

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28 Leadership in high-value specialty verticals Note: Data as of December 31, 2025 Six Differentiated Verticals Deposit Mix (~$29Bn) $1.5Bn Corporate Trust Trust and agency platform integrated across CLO and municipal debt workflows $1.2Bn Business Escrow Services Proprietary paying-agent and escrow platform for M&A deal administration workflows $11Bn Homeowners Association Banking An industry-leader providing integrations across management and accounting systems $6Bn Juris Banking Full-service banking streamlining settlements via proprietary Digital Disbursement rails $2Bn Digital Asset Group Digital asset banking offering institutions proprietary 24/7 currency settlement infrastructure $7Bn Consumer Digital Digital-native platform supplementing commercial deposits with scalable retail balances Reinforcing a Continuous Innovation Platform Distinct client segments 2 Embedded in client workflows 1 Technology-powered deposit engine 3

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29 Note: Each Line of Business (LOB) indexed to 1× at T+0 (the fiscal year in which the given LOB first recorded deposits). Each LOB's CAGR is calculated from the fiscal year in which the LOB first recorded deposits through FY 2025 Newer deposit verticals demonstrate accelerated compounding from inception At comparable stages of maturity, newer business lines exhibit steeper growth curves T+0 T+1 T+2 T+3 T+4 T+5 T+6 T+7 T+8 T+9 T+10 T+11 T+12 25% HOA Banking CAGR (FY13-FY25) 313% Digital Asset Group CAGR (FY22-FY25) 165% Corporate Trust CAGR (FY23-FY25) 79% Business Escrow Services CAGR (FY19-FY25) 59% Juris Banking CAGR (FY18-FY25) 52% Consumer Digital CAGR (FY23-FY25) D e p o s it G ro w th M u lt ip le 2x 10x 60x 30x 15x 5x

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30 $1.7MM $2.4MM 0.0 0.5 1.0 1.5 2.0 2.5 Escrow and trust franchises combine scale with cross-sell driven growth 1. Reflects YoY change from FY 2024 to FY 2025 2. Total count since FY 2021 3. Represents total FY deposits divided by total FY deal count for the applicable FY 4. US CLO New Issue Trustee Rankings (Green Street, 2025) Avg. Deposit Per Deal growth ($MM) 3 2024 2025 Business Escrow Services ~43% Total Deposits Growth (YoY)1 1,900+ # of Deals Administered2 Total Deposit growth ($Bn) 2023 2024 2025 Corporate Trust ~$43Bn AUM Administered 6th Largest CLO Trustee Bank4 $1MM $2.5MM $1.5MM $2MM $0.5MM $0.5Bn $1Bn $1.5Bn $0.2Bn $0.6Bn $1.5Bn

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31 Institutional activity is consolidating toward banks as regulatory compliance is a needed capability Institutional compliance & regulatory readiness Operating standards aligned to institutional expectations, with controls for concentration, exposure and ongoing activity monitoring Institutional activity is increasing in size, complexity and usage – with stablecoins becoming core treasury and settlement infrastructure Digital Asset banking offerings are purpose-built for institutional complexities Market Opportunity Why Western Alliance Wins Note: Data as of December 31, 2025 ~$2Bn Digital Asset Deposits 130+ # of Institutional Clients $15MM Average Deposit Balance Tailored services embedded across client workflows Purpose-built account structures capture institutional funds and stablecoin reserve balances Pursue outsized deposit concentration W h a t W e D o n ' t D o Hold digital assets on our balance sheet W h a t W e D o n ' t D o

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32 5MM 8MM 13MM 31MM Juris Banking drives repeatable fee income growth National legal platform: full-service banking for the legal services industry - credit, treasury, payroll, and working capital Full-service banking for law firms NewLaw Banking Strong fee income growth driven by processing payments to mass tort and legal settlement claimants Adding Value to top settlement administrators, deeply embedded in client workflows Digital payment rails: PayPal, Venmo, Zelle, ACH, check, and other options meeting claimants where they are Proprietary settlement disbursement platform Digital Disbursements $11.8m2022 20252023 2024Granular, stickier deposits driven by IOLTA, client trust, and operating accounts embedded in firm workflows Cross-sell opportunity: relationship depth creates credit cross-sell with clients Juris Banking Transaction Volume (#MM) +60% YoY +63% YoY +139% YoY

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33 Spotlight: Homeowners Association Banking Craig Lee Huntington Head of HOA Banking

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34 ~$11Bn HOA Deposits HOA Banking continues to scale with durable, sticky deposits 3,000 - 4,000 HOAs formed annually Steady TAM growth concentrated in FL, TX, AZ, and CA Bundled relationship model Layered services that extend the HOA relationship beyond traditional deposit banking ~373,000 community associations Foundation for Community Association Research (Fact Book 2025) Proprietary technology platform Online banking, payment portals, assessment collection custom-built for HOA needs Switching friction Large switching costs for management companies related to payment changes and board review $124Bn collected in assessments annually Foundation for Community Association Research (Fact Book 2025) Market Opportunity Why Deposits Are Sticky Note: Data as of December 31, 2025 44,000+ # of HOAs Banked ~$242K Average Deposit Balance Leading Market Share

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35 Right business, right markets, right clients 73% of HOA deposit balances Note: Data as of December 31, 2025 1. Represents the largest HOA growth states from 2023-2025, derived from the Foundation for Community Association Research (FCAR, 2023-2025) are in markets with leading association growth and continued expansion potential Top 10 HOA growth states1 HOA Deposit Balance <$5MM $5MM – $50MM $50MM – $250MM $250MM – $750MM >$750MM No Deposits

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36 HOA Banking growth is driven by client expansion and deeper wallet penetration 29K 33K 37K 41K 44K 20K 25K 30K 40K 50K 2021 2022 2023 2024 2025 $242K 2021 2022 2023 2024 2025 $189K $197K $209K $227K # of Individual HOAs Banked Average Deposit Balance per HOA ($) 35K 45K $170K $180K $190K $200K $210K $220K $230K $240K $250K Growth is driven by both Western Alliance gaining market share and our clients expanding their own market positions, resulting in accelerating, compounding growth Note: Data as of December 31, 2025

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37 Integration creates customer value and reinforces retention Multi-Segment Platform Facilitates efficient scaling of deposits Enables seamless account and transaction management API Integration HOA Financial Systems of Record Opportunity to embed within HOA management company Integrated Payment Capabilities Processes 20MM+ payments annually

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38 Q & A Dale Gibbons – Vice Chairman & Chief Banking Officer Craig Lee Huntington – Head of HOA Banking

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39 Commercial Banking Tim Bruckner Chief Banking Officer

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40 Key Messages Focused on industries where we have a strategic differentiator and expertise Relationship- driven origination helps us meet our return thresholds Technology and Treasury Management enhancements enable greater cross-sell opportunities Our commercial banking platform is built around a full relationship model

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41 Commercial Banking represents the single largest component of our lending franchise and is on a proven path to scale 60% Loans (HFI) 31% Deposits 6.92% Loan Yield 69% Loan Growth Share1 26% Deposit Growth Share1 2.22% Cost Of Deposits Note: Data as of March 31, 2026 1. Loan & Deposit Growth Share is the proportion of bank-wide loans and deposit growth in 2025 contributed by Commercial Banking

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42 A foundation for targeted growth Upgraded payment technology supporting broader, fee-based client engagement Embedded cross- selling Continued expansion into specialized industries with attractive returns Established commercial banking engine Deeper penetration in sector expertise Expand reach in priority geographies and client segments Drive lower cost of deposits Targeted talent investments Position Community Banking into a scalable tech- enabled growth engine Expand fee income offerings Increase share of wallet Path forwardOur journey Opening 3 new Phoenix branches and expanded San Francisco and Denver branch locations Enhance Southeast presence

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43 54%32% 39%53% 33% 60% Note: Data as of December 31, 2025. Includes Lender Finance and Municipal Finance Commercial Banking Total Deposits Total Loans (HFI) Community Banking CRE Finance Specialty Commercial Banking  Innovation Banking  Sponsor Finance  Food & Agriculture  Aerospace & Defense  Branch & Small Business Banking  Business Banking  Private Client Group 26k+ 450+  Entertainment & Media  Gaming  Healthcare 2.6k+ 200+  Hotel Franchise Finance  Resort Finance  Builder Finance  Institutional and Mid-Market 3.3k+ 100+ Relationships Team members 8% 14% Three complementary business segments to fully serve our clients

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44 Community Banking is designed to retain and grow our client relationships High Value Small to Mid Size Clients ~26K+ Loans $2.9Bn Deposits $13.7Bn Note: Data as of December 31, 2025 Technology & Capabilities Digital Banking Services Digital API Integrations Advanced Payment Rails Business and Private Equity Lending Exclusive Deposit and Yield Solutions Sophisticated Cash Management Business Revenue $0MM – $5MM Consumer Relationships $5MM Net Worth Business Revenue $5MM – $35MM How We Win By delivering a seamless digital experience for clients How We Win Prioritizing our client base with white glove services & premier offerings How We Win By leading complex banking transactions with long established relationships Branch & Small Business Banking Business Banking Private Client Group

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46 28% 10% 25% 37% 2025 Hotel Franchise Finance Owners, operators, and developers of franchised hotel properties Resort Finance Resort developers and owners of timeshare projects Builder Finance Homebuilders and developers across residential construction projects Institutional and Mid-Market Developers and investors who finance and operate large-scale commercial properties $5.1Bn $1.8Bn $4.6Bn $6.8Bn CRE Finance Loans $18.3Bn Total Loans 31% Avg. LTV 53% Loan Portfolio Diversification Commercial Real Estate Finance delivering scale, yield and resilience Note: Data as of December 31, 2025

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47 Commercial fee income expansion through cross selling and new capabilities Commercial fee income expansion through cross selling and new capabilities Treasury Management Merchant Services • Purpose-built card solutions for niche clients • Flexible controls and branding enhance client fit • Segmented offerings to serve both smaller and more complex clients • Integrated payments support higher revenue capture • Embedded within niche client workflows • Full-relationship model drives deeper penetration • Tailored solutions for international growth and risk management • Experienced guidance across volatile and complex markets Global Markets Commercial Cards M e rch ant Services Trade Finance Letters of Credit Foreign Exchange Heartland Fiserv Everyday Commercial Plus Elite Members Card Small Business Com m erc ia l C a rd s Treasury M anagem en tG lo ba l M ark ets Accounts Receivable / Payable Armored Courier

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48 Treasury management momentum is accelerating across the business Treasury management momentum is accelerating across the business Dedicated product coverage to grow client penetration Scaling our Elite Members "One Card" adoption Expanding treasury usage across clients +74% ACH1 +42% Positive pay1 +30% Wire transfer1 +18% Lock box1 Driving Total Fee Income Growth2 One Card spend increased 119% '24-25 VISA study: our credit volume growth outpaced peers by 10.6% • Improved client onboarding and payment flows • Fiserv Partnership to support omnichannel merchant payments Building Treasury Innovation and partnerships 2024 2025 $112MM $153MM 2023 $72MM A full-relationship, technology-enabled model that scales efficiently while driving durable fee growth Note: Data as of December 31, 2025 1. Period from 2023-2025 2. Excludes gain/loss on loan sales

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49 Continuing to build scale in our established commercial markets Colorado Nevada Texas Arizona Southeast Established Presence Emerging Geographies Industry-Led Expansion Building depth, not breadth, by scaling in priority markets through targeted specialties and full-relationship execution Expansion Trajectory Illinois New York

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50 Spotlight: Innovation & Sponsor Finance Mike Lederman Head of Innovation Banking

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51 Innovation Banking & Tech Sponsor Finance excellence $5Bn Loan portfolio Technology Banking Fund Banking Life Science Innovation Banking Highlights Established growth focus: Proven companies with strong investor support Revenue-validated borrowers: 98% Technology clients with revenue >$5MM; minimal early-stage risk Strong sponsor profile: 97% of the loan portfolio is backed by an invested sponsor Deep Sector Expertise Loan Portfolio Highlights 29% 43% Sponsor Finance 4% 24% 20+ Years serving the innovation economy 1,800+ Client Relationships AI and FintechHardware and Frontier Tech Fund Banking Life Science Investors Software and Internet Note: Data as of December 31, 2025 Diversified portfolio Avg. loan size $4.6MM

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52 Startup (Early -Stage) Venture Funded (Mid-Stage) Serial Entrepreneur Investors Mature Tech Idea Funding Growth Scale Fund Banking Startup Banking Innovation Banking Innovation Banking Tech Sponsor and Private Client Group Early Stage Growth EmergingLater Stage Cash Flow Growth Capital Venture Debt Recurring Rev Stages Product Type Providing deep sector knowledge and building long-term relationships supporting tech founders and their VC sponsors on their build to scale journey across the innovation banking ecosystem Exit L iq u id it y E v e n t Asset Backed Lending WA - Innovation Banking Presence"Tech-Hub" States Note: Data as of December 31, 2025 We serve businesses where innovation happens – from emerging to maturity

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53 Software risk is idiosyncratic, renewal-based & actively managed 60% Sponsor Finance Innovation Banking Key Takeaways SaaS exposure is low-leverage, mission-critical software where AI is additive, not disruptive Software portfolio remains conservatively structured, actively monitored, and proven across cycles Outstanding SaaS Balances Mix $2.6Bn 2.5% of Loans (HFI) 1.9% of Loans (HFI) 43% 57% • Balances shrink as borrowing base contracts • Monthly performance to plan monitoring • Short contractual obligation; average maturity of 1.9 years • Portfolio churn is high (22-30% annually) • Typically includes 5-year maturities • Deleveraging within 4-6 quarters of closing • Covenant-flip to Debt Service within 2-3 years • Scheduled amortization \| Excess cash flow sweeps Time bound, with frequent maturity events, covenant resets and validation Senior-structured positioning and disciplined loan-to-value protect capital Innovation Banking Short duration, rapid deleveraging and frequent re- validation Sponsor Finance Note: Data as of March 31, 2026

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54 Lender Finance & Corporate Trust Brent Edgecumbe Senior Managing Director, Commercial Banking Jocelyn Lynch President and CEO, Western Alliance Trust Company

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55 Key Messages Differentiated middle market structure and integrated corporate trust oversight Scaled, repeatable platform with proven low-loss performance Strong relationships with institutional counterparties create durable deal flow Resilience driven by structural protections, not underwriting alone Diversified, institutional exposure with highly structured facilities limits risk

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56 Clients We Serve Credit Performance Borrower portfolio default rate stable at ~0.5% in 20254 Disciplined Underwriting Sector Diversity Redemption Exposure Portfolio Metrics & Credit Highlights No borrower has challenged adjustments to leverage, interest coverage, or structural terms Exposure is well-diversified and managed at underwriting, no sector represents more than 17% Of 50 loan facilities reviewed, only 2 received redemption requests, both managed within their caps Deep expertise, diverse clients, and a targeted product suite 1 Established Private Credit Funds Scaled middle-market funds with a proven track record (W.A. AUM: $125Bn) 1 Low Loss History Clients with demonstrated history of minimal losses, prudent risk management and financial stability 2 Modest Use of Leverage Target clients typically employ modest levels of leverage, reducing exposure to financial distress and volatility 3 Strong Covenant Structures Clients with robust financial covenants, providing greater protection and oversight in lending arrangements 4 ~85% Of loan commitments result in trustee fee ~$2.3Bn1 Industry exposure by funded amount Minimal Charge-offs2 Since inception ~$39MM3 In 2025 fees, ~50% increase over prior year 1. Based on most recent data for each obligor, as reported by each facility 2. Excludes $126.4 million charge-off disclosed in Form 8-K on 3/6/2026 3. Mark to market excluded; figure includes CLO and loan book 4. Reflects default rate for obligors specifically within CLO book; loan exposure typically removed ahead of default

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57 Diversified portfolio mitigates risk tied to individual obligors or industries Industry Exposure by Funded Amount Healthcare & Pharma, 17% Business Services, 15% Technology, 11% Consumer Services, 6% Banking & Finance, 5% Industrial & Capital Equipment, 5% Construction & Building Products, 5% Consumer Goods, 5% Media, 4% Food, Beverage & Tobacco, 4% Gaming, Lodging & Leisure, 4% Transportation & Distribution, 3% Aerospace & Defense, 3% Automotive, 2% Telecommunications, 2%Other, 5% ~2,000 differentiated underlying obligors spread across 50+ facilities No Underlying Obligor over $30MM Funded Average Obligor <$2MM Funded Technology represents 11% of portfolio, Software is <5% Chemicals, 1% Insurance, 2% Note: Based on most recent data for each obligor, as reported by each facility. "Other" includes Retail; Energy, Oil & Gas; Packaging & Containers; Paper & Forest Products; Utilities; Metals & Mining; and Real Estate

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58 60% Loan Advance Rate Excess Manager Loan Equity Borrowing Base 50 -100 underlying loans 2% 9% 10% 14% 65% % of Western Alliance Funded by Customer Type (as of April 30, 2026) Loan From Structure Structural protection strengthened by a 60% advance rate, a short expected duration, and low redemption risk Our portfolio is focused on the core middle market borrower with EBITDA of $25MM to $100MM Core Middle Market Upper Middle Market Asset Based Lending Lower Middle Market Broadly Syndicated Loans Lending is structurally protected and has minimal exposure to fringe credit 1.9 years Short Expected Duration +50% Additional equity cushion from underlying company owners 2.3x W.A. Interest Coverage (Q4 2025) 2.3x W.A. Look-through Sr. Leverage (Q4 2025) Obligor Stats Note: Based on most recent data for each obligor, as reported by each facility Structure Stats Asset Based Lending

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59 Multiple structural protections limit risk Exposure reduces before default Kick-outs & revaluation act ahead of credit events Multiple independent controls Five separate layers each operate autonomously Structural, not discretionary Multi-layered first loss protection built in Conservative Advance Rates Effective advance rate is ~53%, creating an equity cushion where losses are first absorbed by PE and manager capital Trust Oversight Daily Independent Trust monitoring & controls of cash flow provides early warning system – 60% of loans administered by Western Alliance Trust Dynamic Borrowing Base Adjusts with credit quality — revaluation triggers reduce exposure automatically Kick-Out Provisions Deteriorating loans removed from borrowing base before default occurs Cash Sweeps Cash domain and sweeping full P&I at lender control until borrowing base is compliant

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60 Frequent monitoring with automatic controls enables borrower line of sight High-frequency monitoring… Credit deterioration triggers exposure adjustments and cashflow protection actions are implemented Eligibility breaches trigger immediate reduction in borrowing base and asset value Concentration breaches are addressed by enforcing portfolio constraints and risk bucket limits …Triggers alerts & automatic risk controls Daily Reporting on funding levels, collection amounts, and interest payments from obligors Monthly Software analyzes borrowing bases, marks, advance rates, and compliance certificates Quarterly All underlying obligors and manager performance reviewed across credit department Annually Independent 3rd party audit of cash flows, collateral, and key partners

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61 Western Alliance Trust Company Jocelyn Lynch President & CEO

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62 Differentiated Corporate Trust franchise with scale, expertise, and momentum 6th Largest CLO trustee in the U.S. Note: Data as of December 31, 2025 Source: US CLO New Issue Trustee Rankings (Green Street, 2025) 1. Western Alliance Trust Company, N.A. is a non-depository national trust bank ~50 Full-time trust employees Deposits have grown from ~$200MM to $1.5Bn 2023 to 2025 Fee revenue grew from ~$2MM to $6.3MM 2024 to 2025 Active mandates grew from 50 to 133 2024 to 2025 ~60% of Lender Finance loans served by Corporate Trust

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63 Independent trustee role Collateral administration Aligned incentives, separated functions Deep structural familiarity How Corporate Trust Enhances Risk Oversight Independent oversight Active, not passive Early warning signal Unparalleled visibility Proprietary Technology Enables risk oversight capabilities An extra layer of risk oversight for structured products and borrowing base Credit events in Trust are visible to Lender Finance before they escalate as structure allows trust and lending to share data Provider of collateral administration and custodial services for SPV leverage facility structures An independent oversight layer on the same collateral pools that Lender Finance lends against As trustee to a large share of our lender finance accounts, the bank has significant visibility into portfolio collateral health Real-time collateral visibility Best-in-industry design goal Integrated with Lender Finance

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64 Mortgage Banking David Bernard Head of Specialized Mortgage Services

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65 Key Messages Diversified multi-stream business model that produces stable results Scalable model with strong operating leverage Embedded upside through refinance cycles provides counter-cyclical buffer Leading full- service provider to mortgage industry AmeriHome's scaled platform offers earnings upside from refinance volume, retail recapture, and margin expansion

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66 Mortgage Banking consists of complementary, countercyclical businesses that are entirely self- funded 16% Loans (HFI) 25% Deposits 6.68% Loan Yield1 25% Loan Growth Share2 34% Deposit Growth Share2 Note: Data as of March 31, 2026 1. Excludes ECR offset 2. Proportion of bank-wide loans and deposit growth in 2025 contributed by Mortgage Banking

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67 MSR AmeriHome Warehouse Western Alliance offers mortgage companies a full-service banking partnership Correspondent originatio n B a la nc e sh ee t-b ased specialty mortgage services Note: Data as of December 31, 2025, unless stated otherwise Warehouse Lending • Short-duration funding • Value-add provider • Low credit risk $3.5Bn Loans (HFI) $0.9Bn Non-Custodial Deposits MSR Finance • Asset-backed lending • Natural business hedge • Multiple deposits to loans $3.8Bn Loans (HFI) $13.8Bn Custodial Deposits AmeriHome • Scaled purchasing platform • Fee generating • Attractive MSR yield $57.9Bn Production (LTM 3/31/2026) $1.6Bn MSR Custodial Deposits Growth is driven by both Western Alliance gaining market share and our clients expanding their own market positions, resulting in accelerating, compounding growth

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68 Warehouse Lending: Low risk gateway product 2010 Founded Zero Credit Losses since founding in 2010 $1.6 $1.3 $2.4 $3.5 2022 2023 2024 2025 Loan Balances ($Bn) Structurally Low Risk 15–30 day average dwell time with loans sold to high quality counterparties and limited duration and credit risk Relationship Economics Serves as an entry point to operating deposits, loan purchases, MSR lending, custodial accounts, and fee generating treasury management services Scale & Repeat Usage Western Alliance is known for flexibility and superior service levels – top 20 customers have average relationship duration of 10 years Core Funding Provider Loans closed through Western Alliance warehouse line generate recurring NII and fees while expanding wallet share across the mortgage ecosystem Note: Data as of December 31, 2025 $3.5Bn Loans $0.9Bn Non-Custodial Deposits Premium Product & Service Provider

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69 MSR Finance: Asset-backed lending with durable earnings How MSR Finance Works 1 Servicer Retains MSR Mortgage originator retains servicing rights — a cash-flowing asset worth a multiple of servicing fee (4-6x) 2 Western Alliance Lends Against MSR Provides bilateral credit facility secured by MSR portfolio. Western Alliance is lender — not the servicer 3 Counter-Cyclical Returns Higher rates → lower prepayments → higher MSR fair value → stronger collateral. Natural rate hedge against origination business 4 Sticky Deposit Generation Each client relationship comes with custodial accounts worth 2-4x typical loan balance – fully funding our mortgage related business 2 21 21 21 2013 Founded 45+ Active MSR agreements Conservative Advance rates (60-65%) $3.8Bn Loans $13.8Bn Custodial Deposits Cash-Flowing Assets MSRs generate predictable recurring servicing income that is valued as a stream of future cash flows, secured lending base Through-Cycle Support Provide committed facilities through rate cycles. Clients value Western Alliance as a strategic capital partner, strengthening long-term relationships Syndication Leadership Moving into lead bank role on syndications – generating revenue from fees, loans, and deposits Rate Environment Upside Rising rates compress refi volume but lift MSR fair value. Customer MSR assets appreciate precisely when origination volume slows Note: Data as of December 31, 2025

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70 Warehouse Lending creates opportunities to expand relationship Served as a trusted financial partner from early stage through scaling — progressively layering in MSR financing, CRE, and deposits as the client grew Full product integration Top 15 Independent Mortgage Bank 12+ Year Client · Began with $15MM MSR loans 4 product expansion Mid-Sized Independent Mortgage Bank 7+ Year Client · Began with WHL + MSR financing Relationship expanded through TM Lockbox solution — cross-sold into full operating banking suite, including correspondent relationship with AmeriHome 4 product expansion Industry Leading Home Improvement Client 9+ Year Client · Began with $25MM WHL Specialized originator — Western Alliance funded niche product expansion into home improvement and 2nd-lien products, becoming primary banking partner Core + Custodial Deposits Core + Custodial Deposits Core Operating Deposits Warehouse Lines MSR Financing Deposits Loan Purchases Full-Service Owner-occupied CRE Pursuing Trust business Lockbox & Credit card 2nd Lien & HELOC portfolio purchases $210MM in AmeriHome purchases $2.0Bn in portfolio purchases and $2.7Bn in AmeriHome purchases

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71 Spotlight: AmeriHome Josh Adler CEO, AmeriHome

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72 97% Scaled mortgage platform with significant upside MSR Portfolio Composition 62% Conventional 32% Government 6% Private 51% 29% 20% AmeriHome Production Volume $57.9Bn 2025 Total 1st Lien Mortgage $1.9Tn Correspondent RetailCorrespondent Retail Wholesale Note: Data as of December 31, 2025, unless stated otherwise Source: 1st lien mortgage market size is for FY 2025 (Inside Mortgage Finance) 1. AmeriHome Mortgage is an operating subsidiary of Western Alliance Bank Business Profile Founded in 2013 and acquired by Western Alliance Bank in 2021 Market Position 10% market share in correspondent channel (full year 2025) Approvals & Licensing Approved seller/servicer with all major federal agencies and Government Sponsored Entities – FNMA , FHLMC, FHA, VA, and USDA Geographic Presence 49+DC States — Servicing Top 5 TX · FL · CA · GA · PA 6th Largest Mortgage Lender in U.S. 2nd Largest Correspondent Lender ~$78Bn MSR Portfolio ~$58Bn Production volume (LTM 3/31/2026) $1.6Bn Deposits

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73 Business model centered around three primary revenue drivers Three Primary Revenue Drivers (2025) Conduit-like economics: revenue is gain on sale, trading/secondary, and recurring servicing fees • Baseline profit earned at time of mortgage loan lock • AI-enabled bidding • Retail originations sourced in serviced portfolio Gain on Sale 1 • Significant scale drives superior execution • Best execution optimization with securitization and whole loan sales Secondary / Trading / Early Buyout – Benefits of Scale 12 • Recurring servicing fee income on $78Bn portfolio • MSR servicing revenue upside as rates rise (counter- cyclical to origination volumes) Loan Servicing – Retained MSR Rights 13 23%34%43% Loan ServicingSecondary/Trading/EBOProduction Gain on Sale Note: Data as of December 31, 2025, unless stated otherwise Total Revenue: ~$335MM A scalable, high-volume correspondent model driven by capital markets expertise and premier service

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74 39% 21% 13% 27% Q4 2025 AmeriHome's loan production and servicing segments act as a "Macro Hedge" Falling Interest Rates Rising Interest Rates Origination volumes increase Gain on sale margins increase MSR yields decrease as prepayments increase, partially offset by hedging Origination volumes decrease Expected/Typical Impacts to Earnings Gain on sale margins for new production decrease MSR yields increase as prepayments slow, partially offset by hedging 3-4% 4-5% 5-6% >6% Percent Mortgages Outstanding by Interest Rate at Origination Source: Mortgages outstanding by interest rate at origination for Q4 2025 (FHFA National Mortgage Database) Rate Buckets ~$13T Total unpaid balances for outstanding 1st lien residential mortgages Significant opportunity from origination volume if mortgage rates fall below 6%

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75 AmeriHome's interest rate risk management is rate neutral MSR Hedging - 99.9% effective 1 Disciplined rate hedging Dynamic hedging tools help keep MSR and exposures tightly managed 2 Forward sales + pipeline management = low risk Production majority are mandatory closed loan deliveries with no fallout risk 3 Daily risk oversight Positions marked daily, with independent monitoring -4% -3% -2% -1% 0% 1% 2% 3% 4% 5% 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 MSR Value Δ Hedge Value Δ 0% 1% 2% 3% 4% -3% -2% -1% 5% -4% Net P&L Δ 10Yr TSY C h a n g e a s a P e rc e n ta g e o f A s s e t F a ir V a lu e (%) A vg -1 0 Y R U S T re a s u ry Y ie ld (%) The combination of our business model, diversified and complementary channels, and active hedging strategy has generated consistent returns in all rate environments

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76 AmeriHome is a scalable mortgage business positioned for growth A M E R I H O M E Scalability Refinance Upside Future Growth Drivers Highly scalable mortgage business with multiple growth levers and significant upside in refinance environments 12 Balanced Business Combined with Strong Risk Management: Stable earnings profile 13 Bank Competitive Advantage: Liquidity and Cost of Funds advantage over Non-Bank Competitors 1 Scaled Infrastructure: Best execution combined with variable costs to scale with market Expanded Trading Platform: Private label securitization 12 Wholesale expansion: Entry through non-delegated expansion 13 Non-Agency Products: QM / Jumbo, 2nd Liens 1 Rates Down, Volume Up: Recapture ~250–300 bps gain- on-sale 12 Margin Expansion: Large volume increases can result in margin expansion as originators build capacity 13 Embedded Recapture: Servicing portfolio drives cost efficient leads 1

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77 Q & A Tim Bruckner – Chief Banking Officer Mike Lederman– Innovation Banking Brent Edgecumbe – Lender Finance Jocelyn Lynch – Corporate Trust, CEO Western Alliance Trust David Bernard – Head of Specialized Mortgage Services Josh Adler – CEO AmeriHome

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78 Risk Management & Credit Emily Nachlas Chief Risk Officer Lynne Herndon Chief Credit Officer

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79 Key Messages Risk oversight, internal controls, and governance structures are effective and scalable Risk Management serves as a competitive advantage to enable safe business growth and innovation Our risk ownership culture is a franchise asset

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80 Risk Management is a strategic differentiator A differentiated risk culture underpins the franchise • Balanced risk-return discipline with measured risk-taking aligned to expected returns • Risk appetite embedded in strategy to guide intentional decision-making A proven track record reinforces risk management effectiveness • Demonstrated resilience through recent banking liquidity events • Established regulatory credibility through consistent, trusted supervisory engagement A scalable model guides disciplined growth • Supported rapid, sound bank expansion from $50Bn in 2021 to over $90Bn in 2025 • LFI-ready risk and control programs designed for growth • Risk and revenue capabilities developed in tandem • Business-centric risk oversight reduces friction and enables decisive action A proactive approach creates strategic advantage

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81 • Leadership team with proven LFI experience • Built a best-in-class Credit and Loan Review function • Assembled a robust Financial Risk oversight team • Developed a scalable BSA/AML Center of Excellence • Maturing emerging and specialized technology risk oversight • Driving optimization through automation and AI • Strengthening strategy and business expansion alignment • Strategic hiring in line with business growth We worked alongside the business to build sound risk infrastructure and guardrails 2021 – 2025 Now, we're positioned to optimize our core capabilities and accelerate growth and innovation 2026 – Future 2026 & Beyond: optimization and enablement

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82 Credit Lynne Herndon Chief Credit Officer

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83 Key Messages Deep sector expertise Specialty knowledge and expertise is a durable competitive advantage Leading credit track record Strong historical charge-off performance and current outlook aligns with peers Disciplined underwriting advantage Significant equity requirements and seasoned team lead to better outcomes Highly diversified portfolio Managed sector concentrations support consistent performance

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84 A diversified loan mix supports resilient credit quality across the franchise Total Loans (HFI)2 6% 6% 3% 3% 4% 2% 5% 6% 3% 3% 3% 4%3%7% 12% 24% 7% Warehouse Lending Municipal & Nonprofit Technology & Innovation Sponsor Finance Equity Fund Resources Specialty Commercial Banking Lender Finance Resort Finance Business Banking Municipal Finance Note Finance CRE – Owner Occupied Hotel Franchise Finance Institutional & Mid Market CRE Residential Construction and Land Development $59.1Bn ~67% of HFI loans Historically, no or minimal losses • Residential • Warehouse Lending • MSR Lending • Equity Fund Resources (Capital Call) • National Builder Finance • Hotel Franchise Finance • Homeowners • Resort Finance • Muni./Non-Profit • Juris • HOA • Specialty C&I1 MSR Lending Excluding residential, no single segment exceeds 15%; most <10% Note: Data as of March 31, 2026 1. Specialty C&I includes Aerospace & Defense, Gaming, Food & Agriculture, Entertainment & Media and Healthcare 2. Total may not sum to 100% due to rounding

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85 Q1 2010 Q1 2022 OtherC&I Residential CLD 19% 52% 14% 14% 2% $4.1Bn 44% 21% 27% 8% 0.4% $41.1Bn CRE (ex-CLD) Q1 2026 48% 21% 24% 7% 0.2% $59.1Bn Our C&I loan portfolio transformation aligns with Commercial Banking's deep sector expertise

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86 Commercial loan portfolio is also geographically diverse Commercial Loans (HFI) (by State) State Amount ($Bn) California $12.9 New York $5.1 Arizona $4.6 Florida $3.4 Texas $2.8 Nevada $2.0 Georgia $1.8 Illinois $1.3 Pennsylvania $1.0 Ohio $0.9 Top 10 Subtotal $35.1 Other States $9.2 Total $44.3 >$5,000MM $1,000MM - $5,000MM $500MM - $1,000MM $100MM - $500MM ≤$100MM No balance Commercial Loan Balance Note: Data as of March 31, 2026; excludes Residential Loans (1-4 Family and Revolving)

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87 Conservative underwriting and asset expertise underpin the Credit function Multiple sources of repayment minimize uncovered risks Collateral and Structure are prioritized over yield Selective client and sponsor screening favors repeat borrowers with proven track record Deep vertical knowledge supports disciplined lending and portfolio monitoring Direct obligor limits constrain single-name exposure, with tighter caps for single-source structures Conservative underwriting requires 40- 45% equity on CRE Diversified collateral supports stronger downside protection across larger relationships

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88 Conservative underwriting and asset expertise – Topical areas Note Finance – 2012 Lender Finance – 2015 • Total commitments – $2.2Bn • Loan-to-Bal. (LTB) Average – 48% • Loan-to-Value (LTV) Average – 22% • Possession of Note • Assignment of CRE • Ongoing lien monitoring • Funded Balance – $2.3Bn1 • Structured borrowing bases • Diverse portfolio company pools • Avg. Commitment – $4MM • Avg. Funded – <$2MM • 3rd party Trustee management of cash flows • Quarterly reevaluation events • Cash flow trap upon default Credit Characteristics: Credit Characteristics: Structural Strengths: Structural Strengths: 1. Based on most recent data for each obligor, as reported by each facility

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89 Moderate NDFI exposure relative to peers 13% 12% 12% 11% 9% 9% 9% 7% 7% 7% 7% 6% 5% 5% 4% 3% 3% 3% 3% 3% 3% 2% 2% 1% 1% 1% 1% 1% 1% 1% 0% 0% 5% 10% 15% 20% NDFI Loans (Excl. Mtg. Credit & Private Equity Funds) as % of Total Loans1 vs. Peers Note: Peers consist of 29 publicly traded banks with total assets greater than $50Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. WAL data as of March 31, 2026 and peer data as of December 31, 2025. Source: S&P Global Market Intelligence 1. Total loans includes Loans HFI, Loans HFS, and Loans eligible for repurchase held in domestic offices of reporting banks

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90 2.3% 4.3% 0.00% 1.00% 2.00% 3.00% 4.00% 5.00% 2015 2020 Q1-26 1.5% 2.6% 0.00% 1.00% 2.00% 3.00% 2015 2020 Q1-26 0.7% 1.3% 0.00% 1.00% 2.00% 3.00% 2015 2020 Q1-26 Consistent growth with disciplined credit performance WAL Peer Median Over 10 years, our asset quality have consistently outpaced our peers Special Mention Loans / Loans Classified Loans / Loans Criticized Loans / Loans Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Source: S&P Global Market Intelligence

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91 Peak quarterly level of criticized loans is best among peers over last 10 years 0% 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% 11% 12% 13% Max Average 22% Criticized Loans / Loans (HFI) (Q2-16 to Q1-26) Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Source: S&P Global Market Intelligence

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92 Long-term NCO track record has outperformed peers Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Source: S&P Global Market Intelligence 1. Reflects Q1 2026 Net Charge Off / Average Loans of 0.39% after exclusion of LAM and Cantor V loans WAL WAL (Adj. – Ex-LAM / Cantor)1 5-Year Average10-Year Average Net Charge Offs / Average Loans 0.10% 0.07% 0.22% 0.00% 0.25% 0.50% 10-Year Peer Median 0.17% 0.12% 0.18% 0.00% 0.20% 0.40% 5-Year

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93 Expect improvement in NPLs in 2H26 as we reach resolution on nonperforming office loans Total Commitments - $2Bn • 43% Appraised within last 18 months • All Substandard loans are reappraised Stabilized - $0.6Bn (29%) • 35% Appraised within last 18 months • W.A. LTV – 59% • W.A. Debt Yield – 10% • W.A. DSCR – 1.4x CLD / Lease-Up - $1.4Bn (71%) Note: This portfolio includes non-pass loans, which has a downward impact on the weighted average • Total Criticized – 15% • Total NPLs – 11% 29% 41% 30% $2.0Bn Lease-Up Stabilized CLD Year Originated % Appraised Last 18-Months 2020 50% 2021 34% 2022 46% 31% 49% 20% $3.1Bn 2020 – 2022 Vintages ~85% of '20 – '22 vintages are either: • Performing • Modified • In Active Resolution 2020 – 2022 Office VintagesTotal CRE Office Portfolio (Q1 2026)

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94 High concentration in low-loss loan categories compared to peers Illustrative Loan Portfolio Risk Profile Estimated Composite Risk Score (Lower = Less Risk) Standardized risk framework: Regulatory loan categories scored for historical loss content (0–3) to ensure cross-bank comparability Composite risk score: Loss scores weighted by portfolio concentration to derive each bank's overall risk profile (WAL: 1.43) Loan Category1 Risk Score Loss Content WAL (%) Residential 1 Low 27% CRE Ex- Multifamily 2 Normal 24% General C&I 2 Normal 18% Mortgage Warehouse 0 Nearly None 16% Private Equity 0 Nearly None 2% Other NDFI Loans 3 High 5% Other Loans 2 Normal 4% HELOC & Other Consumer 3 High 2% Multifamily 1 Low 1% Note: Data as of December 31, 2025; WAL loan total % may not sum due to rounding. Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Source: S&P Global Market Intelligence. Risk score analysis applies a discretionary scoring system to assess inherent loss characteristics by regulatory loan categories as follows: 0 = Nearly None; 1 = Low; 2 = Normal; 3 = High Regulatory data sources: Call Reports, Y-9C filings 1. Includes Loans HFS Key Methodology Takeaways 2.08 2.08 2.05 1.97 1.95 1.90 1.89 1.88 1.87 1.87 1.86 1.86 1.86 1.84 1.80 1.77 1.77 1.75 1.71 1.68 1.64 1.46 1.43 1.42 Peer 22 Peer 21 Peer 20 Peer 19 Peer 18 Peer 17 Peer 16 Peer 15 Peer 14 Peer 13 Peer Median Peer 12 Peer 11 Peer 10 Peer 9 Peer 8 Peer 7 Peer 6 Peer 5 Peer 4 Peer 3 Peer 2 Peer 1

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95 Technology Sonny Sonnenstein Chief Information Officer

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96 Key Messages Our technology and AI investments drive innovation, productivity and growth We build technology that creates distinctive advantage, drives efficiency and lowers the marginal cost of growth We have built a strong technology foundation to serve and protect our clients

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97 A scalable technology estate underpinned by the right talent and capabilities… Increased investment in tech and innovation ~90% increase in tech spend over the last 5 years Tech spend is 10% of Revenue and 17% of OpEx Attracting best-in-class talent 70%+ increase in senior level engineering talent Strengthened strategic leadership 2 C-suite leaders joined in 2024–2025 with 25+ years of LFI-caliber experience …supports and extends our 24x7x365 capabilities nationally Tech Hubs – Phoenix, Dallas, Columbus, Westlake Primary Data Centers Strong foundation protects clients and creates value

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98 Regulatory & LFI Infrastructure Investment Cybersecurity & Resilience Improvements Cloud Migration & AI Foundation Data & Analytics Modernization Run the Bank New Businesses Underpinned by Technology Advanced Payment & API Capabilities Digital Platforms & Assets AI Program Launch Grow the Bank 25% Grow-The-Bank 75% Run-The-Bank 30% Grow-The-Bank 70% Run-The-Bank 2024 2026 Technology investment to build a differentiated, resilient, and valuable franchise ~$250MM has been invested in technology from 2024 to 2026, a growing proportion of overall spend

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99 Corporate Trust Client portal, workflow automation and connected platforms improve agreement processing and scalability HOA Banking Digital capabilities empower homeowners and reduce operational friction for HOAs and management companies Juris / DST Digital disbursements and real-time controls support time- sensitive funds movement Other specialties Customer facing APIs, data, cloud, and AI enable tailored client solutions at scale Business Escrow Services Purpose-built portals digitize interactions and workflows Note Finance Data integration and automation support scale without linear cost growth Business- Led Tech- enabled Purpose built technology enables specialty business success

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100 Innovating to drive productivity & efficiency gains while investing to protect Initial use cases have enabled efficiency Today: AI-Powered Enterprise Productivity & Insights Select focus areas in discovery and long-term value targets Tomorrow: AI-First Strategic Acceleration & Innovation Last 12 Months AI-Enabled Team & Personal Productivity Preferred and Small Business Banking Copilots Industry Intelligence & Reporting Credit Agreement Review & Verification Vendor Due Diligence & On-Boarding Cyber Threat Monitoring Protect From AI With AI Market & Customer Insights Cross & Up-Sell Opportunities Lending Lifecycle Redesign -25% Cycle Time Financial Crimes Compliance 60-80% Faster Triage Industry Average Assistant Adoption Rate 2x Productivity Value $10MM+ Embedded in the business AI Agents Employee Hours Saved 150K+ Note: Productivity estimates based on Microsoft Copilot usage analysis; use case savings based on internal projections

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101 Current Scaling innovation where we have a unique opportunity to win Continue investments in foundational capabilities Broaden AI use cases Use AI to enhance cyber defense (to protect from AI) Accelerate innovation Launch new services Embed AI in bank offerings Evolve forward- looking products Use AI to improve productivity, insights and interactions Business-led, tech- enabled approach Reinforce risk discipline Throughout the journey, we develop tools with our clients and prioritize products with tangible, immediate impact Empowering our business segments on a national scale Top talent in place 100% of business applications in the cloud Beyond202820272026

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102 Financial Outlook A Fortified Franchise with Durable Earnings and Compelling Upside Vishal Idnani Chief Financial Officer

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103 Diversified growth engines driving peer outperformance: Above-peer deposit and loan growth has delivered leading PPNR and TBV growth Resilient earnings across rate and credit cycles: Diversified earnings streams provide a natural hedge as rate and credit conditions shift Earnings momentum is building: Demonstrated operating leverage is translating into accelerating profitability Valuation disconnect creates compelling long- term opportunity: Peer-leading growth and returns are not reflected in current valuation multiples Fortified balance sheet: Capital, liquidity and deposits meaningfully strengthened over the last three years Key Messages Medium-term outlook supported by visible earnings levers: ROATCE expansion driven by lower funding costs, operating leverage and growing fee income

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104 Transformational change in capital, liquidity and deposits Q4 2022 Q1 2026 9.3% 11.0% +1.7% CET1 Q4 2022 Q1 2026 12.1% 14.4% +2.3%Total Capital Loans (HFI)/ Deposits Q4 2022 Q1 2026 97% 71% -26% Cash & Securities/ Assets 1 2Q4 2022 Q1 2026 14% 29% +15% Insured / Collateralized Deposits Q4 2022 Q1 2026 46% 71% +25% Specialized Deposit Verticals Q4 2022 – Q1 2026 Growth ($Bn) Capital Liquidity Deposits HOA Juris Banking Business Escrow Digital Assets Corporate Trust Consumer Digital +$19.7 Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet

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105 Capital levels compare favorably to peers and sit well above regulatory minimums 11.1% 11.0% 11.0% 14.4% 14.4% Total Capital Ratio vs. Peers CET1 vs. Peers ~$2.1Bn excess capital vs. regulatory minimum Excess Capital Regulatory Minimum 4.0% 7.0% 3.9% 10.5% Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Data as of March 31, 2026. Source: S&P Global Market Intelligence 15.9% 13.7% 17.7% 12.3% 9.8% Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet

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106 Strong balance sheet liquidity & high-quality portfolio are flexible across cycles Sources of Liquidity ($Bn) Available for Sale Securities Portfolio Composition 8 2512 18 Q4 2022 Q1 2026 $20 $43 +2.2x Off-Balance Sheet Liquidity On-Balance Sheet Liquidity 30% 28% 16% 14% 6% 6% US Treasuries GNMA CLO (AAA, AA) FNMA/FHLMC Muni/Other Private MBS Yield: ~4.5% Duration: ~2.5 years Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Q1 2026

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107 Earnings momentum is building Net Interest Income ($Bn) Net Income ($Bn) Diluted EPSPPNR1 ($Bn) Total Revenue ($Bn)Non-Interest Income ($Bn) 2023 2024 2025 $2.3 $2.6 $2.9 +11% 2023 2024 2025 $0.3 $0.5 $0.7 +55% 2023 2024 2025 $2.6 $3.2 $3.5 +16% 2023 2024 2025 $1.0 $1.1 $1.4 +20% 2023 2024 2025 $0.7 $0.8 $1.0 +16% 2023 2024 2025 $6.54 $7.09 $8.73 +16% Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet 1. Reflects non-GAAP financial measure; the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found in the Company's Annual Report on Form 10-K for the year ended December 31, 2025

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108 Total Revenue ($Bn) Total Expenses ($Bn) Efficiency Ratio1 Adjusted Efficiency Ratio1, 2 Positive operating leverage continuing Revenue growth materially outpaced expense growth in 2025, driving meaningful efficiency improvement 2024 2025 $3.2 $3.5 2024 2025 $2.0 $2.1 $87MM +4% 2024 2025 63% 59% 2024 2025 53% 50% ~4x Revenue dollars grew ~4x vs. expense growth in 2025 ~3% Adjusted efficiency ratio improved ~3% in 2025 $381MM +12% (290) bps (430) bps Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet 1. Reflects non-GAAP financial measure; the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found in the Company's Annual Report on Form 10-K for the year ended December 31, 2025 2. Adjusted efficiency ratio excludes deposit costs

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109 Branch-Lite Strategy Anchored in attractive regional markets with specialty business lines providing sophisticated sector and product expertise to clients States with established branches WA's branch network represented by major MSAs Physical office locations of business development employees Remote locations of business development employees 60 Total branches and offices Efficiency Ratio1 vs. Peers (FY25) Non-Interest Expense / Avg. Assets vs. Peers (FY25) Adj.2 Reported Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Source: S&P Global Market Intelligence 1. Reflects non-GAAP financial measure; the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found in the Company's Annual Report on Form 10-K for the year ended December 31, 2025 2. Adjusted for ECR deposit costs 2.8% 2.4% 1.7% 1.4% Peer 22 Peer 21 Peer 20 Peer 19 Peer 18 Peer 17 Peer 16 Peer 15 Peer 14 Peer 13 Peer 12 Peer 11 Peer 10 Peer 9 Peer 8 Peer 7 Peer 6 Peer 5 Peer 4 Peer 3 Peer 2 Peer 1 Adj.2 90% 59% 50% 36% Peer 22 Peer 21 Peer 20 Peer 19 Peer 18 Peer 17 Peer 16 Peer 15 Peer 14 Peer 13 Peer 12 Peer 11 Peer 10 Peer 9 Peer 8 Peer 7 Peer 6 Peer 5 Peer 4 Peer 3 Peer 2 Peer 1 Branch-lite model drives operating leverage and a structurally efficient cost base Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Unadj.

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110 Deposits Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6 Peer 7 Peer 8 Peer Median Peer 9 Peer 10 Peer 11 Peer 12 Peer 13 Peer 14 Peer 15 Peer 16 21.1% 20.4% 8.5% 2.9% Loans (HFI) 10-Year CAGR1,2 2025 YoY Growth1 10-Year CAGR1,2 Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6 Peer 7 Peer 8 Peer Median Peer 9 Peer 10 Peer 11 Peer 12 Peer 13 Peer 14 Peer 15 Peer 16 Peer 17 10.5% 9.3% 2.5% Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6 Peer 7 Peer 8 Peer Median Peer 9 Peer 10 Peer 11 Peer 12 Peer 13 Peer 14 Peer 15 Peer 16 22.0% 18.1% 6.3% 1.7% Organic deposit and loan growth has outpaced peers materially Note: Peers consist of the other major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions and the exceptions listed below. 10-year data is through December 31, 2025. Source: S&P Global Market Intelligence 1. Excludes COLB, HBAN, ONB, SSB, UMBF due to completion of M&A deals in 2025 2. Excludes FLG due to M&A activity with NYCB 2025 YoY Growth1 -11.0% Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet 16.3% 3.3% -13.0% Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6 Peer 7 Peer 8 Peer Median Peer 9 Peer 10 Peer 11 Peer 12 Peer 13 Peer 14 Peer 15 Peer 16 Peer 17

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111 PPNR per share and TBVPS growth has compounded at a leading rate Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6 Peer 7 Peer 8 Peer 9 Peer 10 Peer 11 Peer Median Peer 12 Peer 13 Peer 14 Peer 15 Peer 16 Peer 17 Peer 18 Peer 19 Peer 20 Peer 21 Peer 22 27% 8% -26% 10-Year PPNR1 Per Share CAGR vs. Peers Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Data is through December 31, 2025. Source: S&P Global Market Intelligence 1. Reflects non-GAAP financial measure 18% Sustained PPNR per share growth underscores our scalable operating leverage; TBVPS growth is >2.8x that of peers Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6 Peer 7 Peer 8 Peer 9 Peer 10 Peer 11 Peer Median Peer 12 Peer 13 Peer 14 Peer 15 Peer 16 Peer 17 Peer 18 Peer 19 Peer 20 Peer 21 Peer 22 22% 17% 6% -2% 10-Year TBVPS1 CAGR vs. Peers Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet

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112 1. Earnings at Risk defined as pre-tax net interest income adjusted for rate-sensitive non-interest income and expense accounts, projected using simulations over a 12-month period Scenario (12 Mo. from 3/31/2026) Ramp Down 100 bps Ramp Up 100 bps Bull Flattener (1M -70bps \| 10Y -130bps) Bull Steepener (1M -120bps \| 10Y No Δ) Bear Steepener / Stagflation (1M No Δ \| 10Y +80bps) Earnings remain resilient across modeled rate scenarios Mortgage banking and deposit costs offset rate sensitivity, stabilizing earnings Alternative Market Rate Scenarios -2.4% 3.6% -4.5% -2.4% 1.7% 1.7% 0.9% 2.1% 2.6% 0.8% NII Sensitivity Earnings-at-Risk1 Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet

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113 Capital provides substantial loss-absorption capacity Internal stress testing demonstrates capital remains well above regulatory minimums even under severely-adverse scenario • Severe global recession with heightened stress in CRE and corporate debt markets • CRE Price Index drops 38 percentage points • Baa spread widens 125 basis points • Real GDP contracts 8.9% • Unemployment increases to 10.3% • Housing prices fall 40.3% • Assumes 5.3% total loan loss rate in 2026 Internal Stress Scenario Assumptions 11.0% 9.0% Q4 2025 Stressed Minimum 14.5% 12.5% Q4 2025 Stressed Minimum CET1 Capital Ratio – Stress Impact Total Capital Ratio – Stress Impact (2.0%) (2.0%) Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet

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114 Western Alliance vs. Peers: The Performance Gap is Clear Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions and the exceptions listed below. Source: S&P Global Market Intelligence 1. Reflects non-GAAP financial measure 2. Excludes COLB, HBAN, ONB, SSB, UMBF due to completion of M&A deals in 2025 3. Adjusted for ECR deposit costs Metric (FY25) WAL Peer Median2 EPS Growth +23% +16% Deposit Growth +16% +3% Loan (HFI) Growth +9% +3% PPNR1 Growth +26% +8% Fee Income Growth +25% +7% ROATCE1 15% 14% WAL Rank ✓ 6th 1st 3rd 2nd 2nd 6th Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Non-Interest Expense (adj.)3 / Avg. Assets 1.7% 2.4% 2nd TBVPS (ex-AOCI)1 Growth +13% +7% 1st

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115 Western Alliance is a compelling investment Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6 Peer 7 Peer 8 Peer 9 Peer 10 Peer 11 Peer Median Peer 12 Peer 13 Peer 14 Peer 15 Peer 16 Peer 17 Peer 18 Peer 19 Peer 20 Peer 21 Peer 22 19.6x 7.7x 10.9x Peer 1 Peer 2 Peer 3 Peer 4 Peer 5 Peer 6 Peer 7 Peer 8 Peer 9 Peer 10 Peer 11 Peer Median Peer 12 Peer 13 Peer 14 Peer 15 Peer 16 Peer 17 Peer 18 Peer 19 Peer 20 Peer 21 Peer 22 2.5x 1.3x 0.8x 1.7x P/TBV vs. Peers P/E (NTM) vs. Peers Disconnect between strong fundamentals and discounted valuation Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions. Data includes the effects of M&A transactions for peers and have not been adjusted. Market data as of April 30, 2026. Source: S&P Global Market Intelligence

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116 Western Alliance trades at a meaningful discount to its growth and returns 2027E (Consensus) ROATCE to P/TBV Regression¹ Post-GFC EPS CAGR to Post-GFC Price Performance CAGR² y = 10.88x – 0.04; R2 = 73% 0.75x 1.25x 1.75x 2.25x 10.0% 12.0% 14.0% 16.0% 18.0% 20.0% P /T B V 2027E ROATCE Implied Today 1.3x 1.7x +26% to regression line y = 0.58x + 0.02; R2 = 71% 0.0% 4.0% 8.0% 12.0% 16.0% 20.0% 24.0% 0.0% 5.0% 10.0% 15.0% 20.0% 25.0% 30.0% 35.0% P o s t- G F C P ri c e P e rf o rm a n c e C A G R Post-GFC EPS CAGR Implied Today 17.9% 20.8% Note: Peers consist of the other 22 major exchange-traded US banks with total assets between $50Bn and $300Bn as of March 31, 2026, excluding target banks of pending acquisitions and the exceptions listed below. Data includes the effects of M&A transactions for peers and have not been adjusted. Market data as of April 30, 2026. Source: S&P Global Market Intelligence 1. Regression excludes outliers BOKF and CFR 2. Post-GFC period covers 2011-2025. Regression excludes outliers FLG and RF; CFG excluded due to IPO date Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet

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117 Reserves reflect the low-risk profile of the portfolio • Concentration in low-to-no-loss loan categories skews ACL lower relative to peers • ~67% of loan book is in categories with no to minimal losses since 2010 • CLN reference pool of $8Bn on residential loans provides first loss credit protection of ~5% • De minimis consumer exposure excl. residential (auto, credit card) Adjusted Total Loan ACL / Funded Loans Total Loan ACL / Funded Loans Covered by CLNs (Resi) Remaining Residential Loans1 Mortgage Warehouse & MSR Fund Banking Loans Adj. Total ACL 0.87% 1.43% +13 bps +16 bps +24 bps +3 bps Book size $8 Bn $6.3 Bn $7.2 Bn $1.3 Bn No loss history Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Portfolio composition, structural credit protection, and limited loss history support current reserve levels Note: Data as of March 31, 2026 1. Includes EBO loans

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118 Funding costs poised to improve through deposit optimization Deposit Optimization Strategy 31% 25% 14% 15% 8% 7% Commercial Banking Mortgage Banking HOA Specialty Escrow Services Consumer Digital Corporate/Brokered Q1 2026 Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Medium-Term Deposit Composition Change Specialty Escrow Services ∆ + 4% - 7% Commercial Banking ∆ + 2% - 4% HOA ∆ + 1% - 2% Mortgage Banking ∆ (2% - 4%) Consumer Digital ∆ (3% - 4%) Corporate/Brokered ∆ (3% - 4%)

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119 2026 Outlook and Near-Term Financial Trajectory 2025 Baseline 2026 Outlook Commentary Balance Sheet Growth Loans (HFI): $58.7Bn Deposits: $77.2Bn Loans (HFI): +$6Bn Deposits: +$8Bn Strong Q1 deposit growth positions us for deposit optimization Capital (CET1) 11.0% ~11.0% Opportunistically repurchased $50 million in Q1 Net Interest Income $2.9Bn +11% - 14% Assumes no rate cuts in 2026 Tracking towards upper end of range. Variable- rate loans benefit from fewer rate cuts Non-interest Income $678MM +20% - 25% +13% to 17% ex. $51MM securities gains Strong Q1 performance from Juris Banking Non-interest Expense $2.1Bn +7% - 11% Operating Expense mitigating actions partially offset by higher variable comp. for production NIE (Ex. Deposit Costs) $1,481MM $1,600MM - $1,650MM Deposit Costs affected by fewer rate cuts & Q1 deposit outperformanceDeposit Costs $631MM $650MM - $700MM Net Charge-offs 24 bps 25 - 35 bps NCO guidance excludes resolution of 2 recent fraud-related credits Effective Tax Rate 18% ~19% Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Q1 2026 Guidance

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120 Medium-Term Financial Targets ROATCE1 XX% - XX% Adjusted Efficiency1 XX% - XX% ROAA X.X% - X.X% WAL's Value Proposition: A leading national commercial bank with a unique combination of sustainable high-quality growth, leading profitability and dependable earnings 16% - 17% 1.20% - 1.30% ~ 48% Key Medium-Term Profitability Targets Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet 1. Reflects non-GAAP financial measure

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121 78% 80% 74% 22% 20% 19% 7% 2023 2024 2025 Disciplined and dynamic capital allocation Share Repurchases Dividends Organic GrowthCommon Dividends Share RepurchasesOrganic Capital Growth & Accretion Excess capital to be deployed across key priorities • Prioritizing capital deployment towards organic growth opportunities where we see compelling risk-adjusted returns • Will continue to grow the dividend in line with historical precedent • $300MM authorized in Q3 2025 ‒ ~$120MM repurchased since inception ‒ Target CET1 ~11% Capital is flexibly deployed across organic growth, dividends, and share repurchases based on market conditions, growth opportunities, and valuation Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Target Total Payout Ratio of ~20% - 25%

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122 Clear path to sustained 16-17% ROATCE through visible levers • Driven by reduced exposure to higher- cost segments • Prioritizing Commercial Banking & Specialty Escrow deposits • Lowering deposit mix in brokered, Consumer Digital & Mortgage Banking • Target NIM of 3.60% - 3.70% Lower Cost of Deposits • Driven by Commercial Banking, Juris Banking, and AmeriHome • Target 18% - 20% of revenue Increased Fee Income • Revenue scales faster than expenses with lower marginal costs • Technology to support strategic cost management • Target Adjusted Efficiency Ratio2 of ~48% Positive Operating Leverage • Target higher Loan (HFI)-to- Deposit ratio of 77% - 80% • Target CET1 ratio of ~11% • Target Total Payout Ratio of ~20% - 25% • Expect $200MM - $300MM of cumulative share buybacks over medium-term Balance Sheet Optimization ROATCE1 FY25 Medium-Term Target 15.3% 16-17% Lower Cost of Deposits Increased Fee Income Operating Leverage ROATCE Expansion B/S Optimization 1 2 3 4 1 2 3 4 Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Note: Assumes 1 rate cut in first half 2027 1. Reflects non-GAAP financial measure; the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found in the Company's Annual Report on Form 10-K for the year ended December 31, 2025 2. Reflects non-GAAP financial measure

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123 Macro and regulatory tailwinds provide incremental upside opportunities ✓ Category IV threshold (~$100Bn) likely to increase, reducing regulatory burden ✓ Lower compliance costs support increased investment in technology and growth initiatives Regulatory Tailoring ✓ Refinancing activity drives higher warehouse utilization, balances, NII, and fee income ✓ ~$75Bn MSR portfolio provides embedded earnings upside as rates decline Rate-Driven Refi Upside ✓ ~80 bps RWA optimization expected under current proposal ✓ Potential reductions in MSR risk weights (currently ~250%) would support improved capital efficiencyBasel 3 Endgame (Proposal) Compelling Valuation OutlookCycle ResilienceEarnings Momentum Peer OutperformanceFortified Balance Sheet Note: Data as of March 31, 2026

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124 Key Messages 1 Commercial banking model built to scale National platform anchored in specialized verticals drives consistent growth and top-tier returns 2 Specialty focused and product specific deposit verticals are a structural advantage Technology-enabled deposits across targeted sectors deliver durable, scalable, low-cost funding 3 Mortgage banking flywheel adds diversified earnings power AmeriHome platform enhances client acquisition, fee income, and countercyclical performance 4 Disciplined risk & credit management Prepared to cross $100Bn in 2026; specialty knowledge and expertise is a durable competitive advantage 5 Technology-enabled platform accelerates speed and efficiency Technology powers faster execution, scalable client service, and operating leverage across verticals 6 High-quality franchise with compelling valuation Fortified balance sheet, strong earnings momentum, peer leading PPNR and TBV growth, with clear path to 16% - 17% ROATCE 7 Experienced leadership team Seasoned and tested management team with a proven track record, demonstrated resilience, and expertise across economic cycles

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125 Ken Vecchione – President & CEO Dale Gibbons – Vice Chairman & Chief Banking Officer Tim Bruckner – Chief Banking Officer Lynne Herndon – Chief Credit Officer Vishal Idnani – Chief Financial Officer Q & A Emily Nachlas – Chief Risk Officer Sonny Sonnenstein– Chief Information Officer Josh Adler – CEO, AmeriHome

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