OTHER EVENTS. Quarterly Common and Preferred Stock Dividend. At the meeting of the Board of Directors (the “Board”) of Western Alliance Bancorporation held on July 30, 2026, the Board declared a quarterly cash dividend of $0.42 per share of common stock. The Common Stock Dividend will be payable August 27, 2026 to shareholders of record as of August 13, 2026. The Board also declared a quarterly cash dividend of $106.25 per share (equivalent to $0.265625 per depositary share) on its 4.250% Fix…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION . On July 21, 2026, Western Alliance Bancorporation (the “Company”) issued a press release reporting results for the fiscal quarter ended June 30, 2026 and posted on its website its second quarter 2026 Earnings Conference Call Presentation, which contains certain additional historical and forward-looking information relating to the Company. Copies of the press release and presentation slides are attached hereto as Exhibits 99.1 and 99.2, respectiv…

Chief Banking Officer for National Business Lines — Stephen Curley: Resigned to pursue another employment opportunity as CEO in the financial services industry.

OTHER EVENTS. Quarterly Common and Preferred Stock Dividend. At the meeting of the Board of Directors (the “Board”) of Western Alliance Bancorporation held on April 30, 2026, the Board declared a quarterly cash dividend of $0.42 per share of common stock. The Common Stock Dividend will be payable May 29, 2026 to shareholders of record as of May 14, 2026. The Board also declared a quarterly cash dividend of $106.25 per share (equivalent to $0.265625 per depositary share) on its 4.250% Fixed Ra…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION . On April 21, 2026, Western Alliance Bancorporation (the “Company”) issued a press release reporting results for the fiscal quarter ended March 31, 2026 and posted on its website its first quarter 2026 Earnings Conference Call Presentation, which contains certain additional historical and forward-looking information relating to the Company. Copies of the press release and presentation slides are attached hereto as Exhibits 99.1 and 99.2, respecti…

MATERIAL IMPAIRMENTS Western Alliance Bancorporation (the “Company”) was recently informed that the counterparties to a commercial loan facility and forbearance agreement with Western Alliance Bank (the “Bank”) would not make a $42.125 million principal payment required pursuant to those agreements and would also discontinue future payments. On March 2, 2026, the Company concluded that a material charge for impairment would result from notification of this breach of contract. The outstanding…

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 ame…

OTHER EVENTS. Quarterly Common and Preferred Stock Dividend. At the meeting of the Board of Directors (the “Board”) of Western Alliance Bancorporation held on February 5, 2026, the Board declared a quarterly cash dividend of $0.42 per share of common stock. The dividend will be payable on March 6, 2026 to shareholders of record as of February 20, 2026. The Board also declared a quarterly cash dividend of $106.25 per share (equivalent to $0.265625 per depositary share) on its 4.250% Fixed Rate…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION . On January 26, 2026, Western Alliance Bancorporation (the “Company”) issued a press release reporting results for the fiscal quarter ended December 31, 2025 and posted on its website its fourth quarter 2025 Earnings Conference Call Presentation, which contains certain additional historical and forward-looking information relating to the Company. Copies of the press release and presentation slides are attached hereto as Exhibits 99.1 and 99.2, re…

The filing describes the establishment of a deferred compensation plan, which is a non-management matter mis-filed under Item 5.02.

Director — Dr. Michael Papay, Mr. Clarke Starnes III: The filing discloses the appointment of two new independent directors to expand the board, which is a routine governance action rather than a departure of a senior executive.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. On November 24, 2025, Western Alliance Bank (the “Bank”), a state member bank organized under the laws of the State of Arizona and the banking subsidiary of Western Alliance Bancorporation, a Delaware corporation (the “Company”), issued $400,000,000 aggregate principal amount of 6.537% Fixed Rate Reset Subordinated Notes due November 15, 2035 (the “Notes”). The Notes were issued…

Regulation FD Disclosure. On November 19, 2025, Western Alliance Bank (the “Bank”), a state member bank organized under the laws of the State of Arizona and the banking subsidiary of Western Alliance Bancorporation, a Delaware corporation (the “Company”), announced that it successfully priced $400,000,000 aggregate principal amount of 6.537% Fixed Rate Reset Subordinated Notes due 2035 (the “Notes”) in a transaction exempt from registration under Section 3(a)(2) of the Securities Act of 1933,…

OTHER EVENTS. Quarterly Common and Preferred Stock Dividend. Pursuant to a unanimous written consent, dated October 31, 2025, the Board of Directors (the "Board") of Western Alliance Bancorporation declared a quarterly cash dividend of $0.42 per share of common stock (the "Common Stock Dividend"). The Common Stock Dividend will be payable November 28, 2025 to shareholders of record as of November 13, 2025. The Board also declared a quarterly cash dividend of $106.25 per share (equivalent to $…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION . On October 21, 2025, Western Alliance Bancorporation (the “Company”) issued a press release reporting results for the fiscal quarter ended September 30, 2025 and posted on its website its third quarter 2025 Earnings Conference Call Presentation, which contains certain additional historical and forward-looking information relating to the Company. Copies of the press release and presentation slides are attached hereto as Exhibits 99.1 and 99.2, re…

REGULATION FD DISCLOSURE. In response to investor inquiries about a recent peer bank 8-K filing, Western Alliance Bancorporation (“Company”) is providing additional information about one of Western Alliance Bank’s (“Bank”) credit relationships. The Bank has a note finance revolving credit facility to Cantor Group V, LLC secured by pledged commercial real estate loans and their cash proceeds. In August, the Bank initiated a lawsuit alleging fraud by the borrower in failing to provide collatera…

OTHER EVENTS. On September 12, 2025, Western Alliance Bancorporation (the “Company”) announced that its Board of Directors authorized a common stock repurchase program, pursuant to which the Company is authorized to repurchase up to $300 million of the Company’s shares of common stock. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by this reference.

OTHER EVENTS. Quarterly Common and Preferred Stock Dividend. At the meeting of the Board of Directors (the “Board”) of Western Alliance Bancorporation held on July 31, 2025, the Board declared a quarterly cash dividend of $0.38 per share of common stock. The dividend will be payable on August 29, 2025 to shareholders of record as of August 14, 2025. The Board also declared a quarterly cash dividend of $106.25 per share (equivalent to $0.265625 per depositary share) on its 4.250% Fixed Rate Re…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION . On July 17, 2025, Western Alliance Bancorporation (the “Company”) issued a press release reporting results for the fiscal quarter ended June 30, 2025 and posted on its website its second quarter 2025 Earnings Conference Call Presentation, which contains certain additional historical and forward-looking information relating to the Company. Copies of the press release and presentation slides are attached hereto as Exhibits 99.1 and 99.2, respectiv…

CFO — Vishal Idnani: The filing announces the planned appointment of an external candidate as CFO, with the current CFO transitioning to a different role rather than leaving the company.

OTHER EVENTS. Quarterly Common and Preferred Stock Dividend. At the meeting of the Board of Directors (the “Board”) of Western Alliance Bancorporation held on May 1, 2025, the Board declared a quarterly cash dividend of $0.38 per share of common stock. The dividend will be payable on May 30, 2025 to shareholders of record as of May 15, 2025. The Company's Board of Directors also declared a quarterly cash dividend of $106.25 per share (equivalent to $0.265625 per depositary share) on its 4.250…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION . On April 21, 2025, Western Alliance Bancorporation (the “Company”) issued a press release reporting results for the fiscal quarter ended March 31, 2025 and posted on its website its first quarter 2025 Earnings Conference Call Presentation, which contains certain additional historical and forward-looking information relating to the Company. Copies of the press release and presentation slides are attached hereto as Exhibits 99.1 and 99.2, respecti…

CEO — Kenneth A. Vecchione: The filing reports the return of the CEO from a temporary medical leave and the reappointment to his previous role, which is a restoration of status rather than a departure.

UNREGISTERED SALES OF EQUITY SECURITIES As previously announced, on March 24, 2025, Western Alliance Bancorporation (the “Company”), its wholly owned subsidiary, Western Alliance Bank (“WAB”), and BW Real Estate, Inc., a real estate investment trust subsidiary of WAB (“BW”), entered into a Purchase Agreement (the “Purchase Agreement”) with J.P. Morgan Securities LLC and MUFG Securities Americas Inc., as representatives for the initial purchasers named therein (the “Purchasers”), pursuant to w…

ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT. On March 24, 2025, Western Alliance Bancorporation (the “Company”), its wholly owned subsidiary Western Alliance Bank (the “WAB”) and BW Real Estate, Inc., a real estate investment trust subsidiary of WAB (“BW”), entered into a Purchase Agreement (the “Purchase Agreement”) with J.P. Morgan Securities LLC and MUFG Securities Americas Inc., as representatives for the initial purchasers named therin (the “Purchasers”), pursuant to which, subject to the…