SEC Form 4 · accession 0000887343-26-000174
COLUMBIA BANKING SYSTEM, INC. · COLB
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Judi Giem
Officer — EVP CHRO
Period of report
Aug 14, 2026
Accepted (ET)
Aug 18, 2026 · 4:50 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0000887343
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | Aug 14, 2026 | M | 2,393 | $32.69 | A | 2,393 | D | |
| Common Stock | Aug 14, 2026 | F | 643 | $32.69 | D | 1,750 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Stock UnitF1 | — | Aug 14, 2026 | M | 2,393 | D | — | — | Common Stock | 2,393 | 13,108 | D |
Explanation of responses
- F1Restricted Stock Units convert into common stock on a one-for-one basis. On July 22, 2025, the reporting person was granted 7,179 Restricted Stock Units, which vest in three annual installments beginning on August 14, 2026.