Cort L. O'Haver - 25 Feb 2025 Form 4/A - Amendment Insider Report for COLUMBIA BANKING SYSTEM, INC. (COLB)

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Ownership	Footnotes
transaction	COLB	Restricted Stock Unit	Award	$999,974	+37,593		$26.60	37,593	25 Feb 2025	Common Stock	37,593	Direct	F1, F2
transaction	COLB	Performance Restricted Stock Unit	Award	$749,987	+28,195	+34%	$26.60	112,133	25 Feb 2025	Common Stock	28,195	Direct	F2, F3
transaction	COLB	Performance Restricted Stock Unit	Award	$749,987	+28,195	+25%	$26.60	140,328	25 Feb 2025	Common Stock	28,195	Direct	F2, F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	Restricted stock units granted 02/25/2025. The grant will vest 33.33% per year over three years.
F2	The Form 4 filed February 26, 2025, inadvertently included incorrect amounts for the number of restricted stock units and performance stock units. This amendment reports the correct amounts.
F3	Performance restricted stock units granted 02/25/2025. The grant will vest approximately three years following the grant date based on the issuer's relative total shareholder return performance for fiscal years 2025-2027 compared to a Compensation Committee approved group of peers.
F4	Performance restricted stock units granted 02/25/2025. The grant will vest approximately three years following the grant date based on the issuer's relative return on tangible common equity for fiscal years 2025-2027 compared to a Compensation Committee approved group of peers.