COLUMBIA BANKING SYSTEM, INC. 8-K

What Happened
Columbia Banking System, Inc. (COLB) filed an 8-K on March 31, 2026 (Item 7.01) announcing it will conduct a quarterly earnings conference call on Thursday, April 23, 2026 at 2:00 p.m. PT (5:00 p.m. ET). Management said it will discuss Columbia’s first quarter 2026 financial results and provide an update on recent activities. A press release with the conference call information is attached as Exhibit 99.1 and incorporated by reference.

Key Details

• Conference call date/time: April 23, 2026 at 2:00 p.m. PT / 5:00 p.m. ET.
• Topic: Discussion of Columbia’s Q1 2026 financial results and updates on recent activities.
• Disclosure type: Filed as a Regulation FD disclosure (Item 7.01) on Form 8-K.
• Press release announcing the call is attached as Exhibit 99.1 to the filing.

Why It Matters
This filing sets the schedule for Columbia’s Q1 2026 earnings release and management commentary — the primary public opportunity for investors to hear results, ask questions (if enabled), and learn management’s view on recent business developments. Retail investors who track Columbia’s quarterly results should note the date and time to review the report and listen to management’s update.