Core Viewpoint - Columbia Banking System, Inc. will release its fourth quarter 2025 financial results on January 22, 2026, after market close, and will host a conference call for investors and analysts to discuss these results and recent activities [1]. Company Overview - Columbia Banking System, Inc. is headquartered in Tacoma, Washington, and is the parent company of Columbia Bank, which is the largest bank headquartered in the Northwest and one of the largest in the West, with locations across several states including Arizona, California, Colorado, Idaho, Nevada, Oregon, Utah, and Washington [2]. - Columbia Bank offers a full suite of services including retail and commercial banking, Small Business Administration lending, institutional and corporate banking, and equipment leasing, along with investment and wealth management services through Columbia Wealth Management [2].

Group 1 - Columbia Banking System, Inc. will release its third quarter 2025 financial results on October 30, 2025, after market close [1] - A conference call for investors and analysts will be held at 2:00 p.m. PT (5:00 p.m. ET) on the same day, including a live question-and-answer session [1] - Participants can register for the call to receive dial-in details and unique PINs or join the listen-only audiocast [1] Group 2 - Columbia Banking System, Inc. is headquartered in Tacoma, Washington, and is the parent company of Columbia Bank, which was renamed from Umpqua Bank effective July 1, 2025 [4] - Columbia Bank is the largest bank headquartered in the Northwest and one of the largest in the West, with over $50 billion in assets and locations across several states [2] - The bank offers a full suite of services, including retail and commercial banking, SBA lending, institutional and corporate banking, and equipment leasing, along with investment and wealth management services [2]

Group 1 - Columbia Banking System, Inc. will participate in the Barclays 23rd Annual Global Financial Services Conference on September 10, 2025, at 11:15 a.m. ET [1] - A live audiocast of the presentation will be available on the company's investor relations website, which may include forward-looking statements [2] - Columbia Banking System, Inc. is headquartered in Tacoma, Washington, and is the parent company of Columbia Bank, which is the largest bank headquartered in the Northwest with over $50 billion in assets [3] Group 2 - Columbia Bank offers a full suite of services including retail and commercial banking, Small Business Administration lending, institutional and corporate banking, and equipment leasing [3] - Customers of Columbia Bank have access to investment and wealth management services through Columbia Wealth Advisors and Columbia Trust Company [3]

Group 1 - Columbia Banking System, Inc. will participate in the Barclays 23rd Annual Global Financial Services Conference on September 10, 2025, at 11:15 a.m. ET [1] - A live audiocast of the presentation will be available on the company's investor relations website [2] - Columbia Banking System is headquartered in Tacoma, Washington, and is the parent company of Columbia Bank, which is the largest bank headquartered in the Northwest with over $50 billion in assets [3] Group 2 - Columbia Bank offers a full suite of services including retail and commercial banking, Small Business Administration lending, institutional and corporate banking, and equipment leasing [3] - Customers of Columbia Bank have access to investment and wealth management services through Columbia Wealth Advisors and Columbia Trust Company [3]