# EDGAR Filing Document

**Accession Number:** 0000887343
**File Stem:** 9999999995-25-001933
**Filing Date:** 2025-6
**Character Count:** 1363
**Document Hash:** db2c85d91ec71f7396f2c8b54011eb88
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-25-001933.hdr.sgml**: 20250617

**ACCESSION NUMBER**: 9999999995-25-001933

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250616

**DATE AS OF CHANGE**: 20250617

**EFFECTIVENESS DATE**: 20250616

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** COLUMBIA BANKING SYSTEM, INC.
- **CENTRAL INDEX KEY:** 0000887343
- **STANDARD INDUSTRIAL CLASSIFICATION:** STATE COMMERCIAL BANKS [6022]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 911422237
- **STATE OF INCORPORATION:** WA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-287607
- **FILM NUMBER:** 251051746

**BUSINESS ADDRESS:**
- **STREET 1:** 1301 A STREET
- **CITY:** TACOMA
- **STATE:** WA
- **ZIP:** 98402
- **BUSINESS PHONE:** 2533051900

**MAIL ADDRESS:**
- **STREET 1:** 1301 A STREET
- **CITY:** TACOMA
- **STATE:** WA
- **ZIP:** 98402

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COLUMBIA BANKING SYSTEM INC
- **DATE OF NAME CHANGE:** 19930328

### UNITED STATES
### SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## Notice of Effectiveness

**Date:** June 16, 2025

**Time:** 16:00:00

**Form Type:** S-4

---

**CIK:** 0000887343

**Company Name:** COLUMBIA BANKING SYSTEM, INC.

**File Number:** 333-287607