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 26-50 of 1,000 matching filings.

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2

DEFA14A File 000-20288

DEFA14A

Filing date: 31 Mar 2026
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

11-K File 000-20288

11-K

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

8-K File 000-20288

8-K

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

SCHEDULE 13G/A File 005-50084

SCHEDULE 13G/A filing

Filing date: 26 Mar 2026
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4/A

FORM 4/A

Filing date: 20 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4/A

FORM 4/A

Filing date: 20 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 16 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 17 Mar 2026
Reporting date: 13 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 05 Mar 2026
Reporting date: 03 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

144 File 000-20288

144 filing

Filing date: 04 Mar 2026
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

144 File 000-20288

144 filing

Filing date: 03 Mar 2026
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 02 Mar 2026
Reporting date: 01 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 02 Mar 2026
Reporting date: 01 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 02 Mar 2026
Reporting date: 01 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 02 Mar 2026
Reporting date: 01 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4

FORM 4

Filing date: 02 Mar 2026
Reporting date: 01 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

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