InsiderTrades

Form 4 for COLB COLUMBIA BANKING SYSTEM, INC.

Accepted 2026-05-18 17:14:31 ET · period of report 2026-05-14 · accession 0001610217-26-000002 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X Filed Traded Ticker Insider Title Type Price Qty Owned ΔOwn Value
2026-05-18 17:14 2026-05-14 COLB SEATON ELIZABETH WHITEHEAD Dir A - Grant $0.00 +3,949 3,949 New $0

Purchase Sale Sale after option exercise All abbreviations

Every reported transaction

#TableSecurityDateCodeA/DSharesPriceOwned afterOwnExercise / expiryUnderlyingFootnotes
1 Common Common Stock 2026-05-14 A A 3,949 $0.00 3,949 D — —