COLUMBIA BANKING SYSTEM, INC. reports

Company location: Tacoma, WA
Fiscal year end: 31 December

COLUMBIA BANKING SYSTEM, INC. has filed 1,878 SEC EDGAR filings since 22 May 1996

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SEC filing history

Showing 1-25 of 1,000 matching filings.

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1

4

FORM 4

Filing date: 02 Jul 2026
Reporting date: 30 Jun 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

8-K File 000-20288

8-K

Filing date: 01 Jul 2026
Reporting date: 30 Jun 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

11-K File 000-20288

11-K

Filing date: 25 Jun 2026
Reporting date: 31 Dec 2025
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

4

FORM 4

Filing date: 16 Jun 2026
Reporting date: 15 Jun 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

11-K/A File 000-20288

11-K/A

Filing date: 16 Jun 2026
Reporting date: 31 Dec 2025
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

4

FORM 4

Filing date: 10 Jun 2026
Reporting date: 08 Jun 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

144 File 000-20288

144 filing

Filing date: 08 Jun 2026
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 18 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

8-K File 000-20288

8-K

Filing date: 15 May 2026
Reporting date: 15 May 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

8-K File 000-20288

8-K

Filing date: 15 May 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

10-Q File 000-20288

10-Q

Filing date: 05 May 2026
Reporting date: 31 Mar 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

SCHEDULE 13G File 005-50084

SCHEDULE 13G filing

Filing date: 29 Apr 2026
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

8-K File 000-20288

8-K

Filing date: 23 Apr 2026
Reporting date: 23 Apr 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

4

FORM 4

Filing date: 16 Apr 2026
Reporting date: 15 Apr 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

ARS File 000-20288

ARS

Filing date: 31 Mar 2026
Reporting date: 31 Dec 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

DEF 14A File 000-20288

DEF 14A

Filing date: 31 Mar 2026
Reporting date: 14 May 2026
SEC evidence: Open document Open filing Open XBRL
Next action: Verify source filing

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