Columbia Banking System, Inc.: reports third quarter 2026 results

What happened On Oct 22, 2026, Columbia Banking System, Inc. issued a press release announcing third quarter 2026 financial results (attached as Exhibit 99.1). On Oct 22, 2026, the company also issued an investor slide presentation that it intends to review in conjunction with its earnings release conference call (attached as Exhibit 99.2). The company said it will include final financial statements and additional analyses for the quarter ended Sep 30, 2026 as part of its quarterly report on Form 10-Q covering that period.

Key details

• Press release announcing third quarter 2026 financial results issued Oct 22, 2026 (Exhibit 99.1).
• Investor slide presentation issued Oct 22, 2026 for review with the earnings call (Exhibit 99.2).
• Company will file final financial statements and additional analyses for the quarter ended Sep 30, 2026 in its Form 10-Q.
• The press release and slides are described in the filing as not being "filed" for purposes of Section 18 of the Exchange Act and not incorporated by reference into registration statements under the Securities Act.

Why it may matter This 8-K reports Item 2.02 (results of operations and financial condition), covering the earnings press release, and Item 7.01 (Regulation FD disclosure), covering the investor presentation for the earnings call. The filing does not show why the company acted.