{"transactions":[{"id":4618284,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":37883,"kind":"person","name":"MACHUCA LUIS","position":1,"cik":"0001133099","reported_name":"MACHUCA LUIS","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Deferred Compensation Phantom Stock","published_at":"2026-09-15T20:55:01.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":594,"price":30.48,"value":18105.12,"ownership":{"direct":false,"nature":"Deferred Compensation"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be settled in accordance with the terms of the deferred compensation plan following the reporting person's cessation of service as a director of the Registrant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be settled in accordance with the terms of the deferred compensation plan following the reporting person's cessation of service as a director of the Registrant."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be settled in accordance with the terms of the deferred compensation plan following the reporting person's cessation of service as a director of the Registrant."}],"balance_after":49560,"derivative":{"underlying":"Common","underlying_shares":594},"source":{"system":"sec-edgar","filing":"0000887343-26-000178","document":"wk-form4_1789505698.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1133099/000088734326000178/wk-form4_1789505698.xml","form_type":"4"}},{"id":3553016,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":68040,"kind":"person","name":"GARDNER STEVEN R","position":1,"cik":"0001267342","reported_name":"GARDNER STEVEN R","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-08T21:24:35.000Z","date":"2026-09-04","kind":"grant","planned":false,"acquired":true,"shares":2577,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":2577,"source":{"system":"sec-edgar","filing":"0001267342-26-000003","document":"wk-form4_1788902673.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1267342/000126734226000003/wk-form4_1788902673.xml","form_type":"4"}},{"id":4629,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":708,"kind":"person","name":"LAGOMARSINO SIMONE","position":1,"cik":"0001084960","reported_name":"LAGOMARSINO SIMONE","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-04T20:41:52.000Z","date":"2026-09-02","kind":"grant","planned":false,"acquired":true,"shares":2670,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":2670,"source":{"system":"sec-edgar","filing":"0001084960-26-000007","document":"wk-form4_1788554509.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084960/000108496026000007/wk-form4_1788554509.xml","form_type":"4"}},{"id":684500,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":22531,"kind":"person","name":"Giem Judi","position":1,"cik":"0001813483","reported_name":"Giem Judi","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP CHRO"}}],"security":"Restricted Stock Unit","published_at":"2026-08-18T20:50:51.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":false,"shares":2393,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted 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."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Restricted 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."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted 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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted 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."}],"balance_after":13108,"derivative":{"underlying":"Common Stock","underlying_shares":2393},"source":{"system":"sec-edgar","filing":"0000887343-26-000174","document":"wk-form4_1787086248.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000174/wk-form4_1787086248.xml","form_type":"4"}},{"id":684499,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":22531,"kind":"person","name":"Giem Judi","position":1,"cik":"0001813483","reported_name":"Giem Judi","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP CHRO"}}],"security":"Common Stock","published_at":"2026-08-18T20:50:51.000Z","date":"2026-08-14","kind":"tax_withholding","planned":false,"acquired":false,"shares":643,"price":32.69,"value":21019.67,"ownership":{"direct":true},"balance_after":1750,"source":{"system":"sec-edgar","filing":"0000887343-26-000174","document":"wk-form4_1787086248.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000174/wk-form4_1787086248.xml","form_type":"4"}},{"id":684498,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":22531,"kind":"person","name":"Giem Judi","position":1,"cik":"0001813483","reported_name":"Giem Judi","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP CHRO"}}],"security":"Common Stock","published_at":"2026-08-18T20:50:51.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":true,"shares":2393,"price":32.69,"value":78227.17,"ownership":{"direct":true},"balance_after":2393,"source":{"system":"sec-edgar","filing":"0000887343-26-000174","document":"wk-form4_1787086248.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000174/wk-form4_1787086248.xml","form_type":"4"}},{"id":719760,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":33370,"kind":"person","name":"Deer Aaron James","position":1,"cik":"0001810107","reported_name":"Deer Aaron James","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Strategy/Innov Offcr"}}],"security":"Common Stock","published_at":"2026-07-02T21:17:10.000Z","date":"2026-06-30","kind":"purchase","planned":false,"acquired":true,"shares":886,"price":25.37,"value":22477.82,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"ESPP Purchase"}],"balance_after":42761,"source":{"system":"sec-edgar","filing":"0000887343-26-000161","document":"wk-form4_1783027024.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000161/wk-form4_1783027024.xml","form_type":"4"}},{"id":736922,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":37883,"kind":"person","name":"MACHUCA LUIS","position":1,"cik":"0001133099","reported_name":"MACHUCA LUIS","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Deferred Compensation Phantom Stock","published_at":"2026-06-16T20:46:30.000Z","date":"2026-06-15","kind":"grant","planned":false,"acquired":true,"shares":563,"price":31.78,"value":17892.14,"ownership":{"direct":false,"nature":"Deferred Compensation"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be settled in accordance with the terms of the deferred compensation plan following the reporting person's cessation of service as a director of the Registrant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be settled in accordance with the terms of the deferred compensation plan following the reporting person's cessation of service as a director of the Registrant."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be settled in accordance with the terms of the deferred compensation plan following the reporting person's cessation of service as a director of the Registrant."}],"balance_after":48966,"derivative":{"underlying":"Common","underlying_shares":563},"source":{"system":"sec-edgar","filing":"0001133099-26-000010","document":"wk-form4_1781642787.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000113309926000010/wk-form4_1781642787.xml","form_type":"4"}},{"id":743833,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2026-06-10T20:52:47.000Z","date":"2026-06-08","kind":"sale","planned":false,"acquired":false,"shares":3812,"price":29.775,"value":113502.3,"ownership":{"direct":true},"balance_after":18636,"source":{"system":"sec-edgar","filing":"0001798077-26-000005","document":"wk-form4_1781124764.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179807726000005/wk-form4_1781124764.xml","form_type":"4"}},{"id":743832,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2026-06-10T20:52:47.000Z","date":"2026-06-08","kind":"sale","planned":false,"acquired":false,"shares":60,"price":29.77,"value":1786.2,"ownership":{"direct":true},"balance_after":22448,"source":{"system":"sec-edgar","filing":"0001798077-26-000005","document":"wk-form4_1781124764.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179807726000005/wk-form4_1781124764.xml","form_type":"4"}},{"id":775941,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":46643,"kind":"person","name":"Varnado Anddria","position":1,"cik":"0001757895","reported_name":"Varnado Anddria","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T21:18:03.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":30894,"source":{"system":"sec-edgar","filing":"0000887343-26-000147","document":"wk-form4_1779139080.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000147/wk-form4_1779139080.xml","form_type":"4"}},{"id":775939,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":42377,"kind":"person","name":"Terry Hilliard C. III","position":1,"cik":"0001481735","reported_name":"Terry Hilliard C. III","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T21:17:04.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":55514,"source":{"system":"sec-edgar","filing":"0001481735-26-000003","document":"wk-form4_1779139021.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000148173526000003/wk-form4_1779139021.xml","form_type":"4"}},{"id":775940,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":46642,"kind":"person","name":"STUDENMUND JAYNIE M","position":1,"cik":"0001222385","reported_name":"STUDENMUND JAYNIE M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T21:16:20.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":21807,"source":{"system":"sec-edgar","filing":"0001222385-26-000002","document":"wk-form4_1779138977.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000122238526000002/wk-form4_1779138977.xml","form_type":"4"}},{"id":775938,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":46641,"kind":"person","name":"SEATON ELIZABETH WHITEHEAD","position":1,"cik":"0001610217","reported_name":"SEATON ELIZABETH WHITEHEAD","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T21:14:31.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":3949,"source":{"system":"sec-edgar","filing":"0001610217-26-000002","document":"wk-form4_1779138868.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000161021726000002/wk-form4_1779138868.xml","form_type":"4"}},{"id":775937,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":46640,"kind":"person","name":"SCHULTZ JOHN F","position":1,"cik":"0001548933","reported_name":"SCHULTZ JOHN F","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T21:13:25.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Beneficial ownership has been adjusted to correct a prior reporting error, as a disposition of 3,000 shares reported on August 29, 2024 was not reflected in subsequent ownership totals."}],"balance_after":50384,"source":{"system":"sec-edgar","filing":"0000887343-26-000146","document":"wk-form4_1779138802.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000146/wk-form4_1779138802.xml","form_type":"4"}},{"id":775936,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":26606,"kind":"person","name":"MITCHELL M CHRISTIAN","position":1,"cik":"0001284574","reported_name":"MITCHELL M CHRISTIAN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T21:10:47.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":41909,"source":{"system":"sec-edgar","filing":"0001284574-26-000003","document":"wk-form4_1779138644.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000128457426000003/wk-form4_1779138644.xml","form_type":"4"}},{"id":775934,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":37883,"kind":"person","name":"MACHUCA LUIS","position":1,"cik":"0001133099","reported_name":"MACHUCA LUIS","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T21:10:09.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":29953,"source":{"system":"sec-edgar","filing":"0001133099-26-000007","document":"wk-form4_1779138606.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000113309926000007/wk-form4_1779138606.xml","form_type":"4"}},{"id":775935,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":46639,"kind":"person","name":"Lund Randal Lee","position":1,"cik":"0001713258","reported_name":"Lund Randal Lee","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T21:09:01.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":27663,"source":{"system":"sec-edgar","filing":"0001713258-26-000002","document":"wk-form4_1779138537.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000171325826000002/wk-form4_1779138537.xml","form_type":"4"}},{"id":775933,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":46638,"kind":"person","name":"Forrest Eric","position":1,"cik":"0001610387","reported_name":"Forrest Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T20:31:49.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":36351,"source":{"system":"sec-edgar","filing":"0001610387-26-000002","document":"wk-form4_1779136307.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000161038726000002/wk-form4_1779136307.xml","form_type":"4"}},{"id":775932,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":46637,"kind":"person","name":"Finkelstein Mark A","position":1,"cik":"0001537873","reported_name":"Finkelstein Mark A","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-18T20:30:47.000Z","date":"2026-05-14","kind":"grant","planned":false,"acquired":true,"shares":3949,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":35554,"source":{"system":"sec-edgar","filing":"0001537873-26-000002","document":"wk-form4_1779136243.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000153787326000002/wk-form4_1779136243.xml","form_type":"4"}},{"id":807644,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":52347,"kind":"person","name":"Lakely Brock","position":1,"cik":"0001740374","reported_name":"Lakely Brock","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2026-04-16T21:31:50.000Z","date":"2026-04-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":396,"price":29.1,"value":11523.6,"ownership":{"direct":true},"balance_after":10708,"source":{"system":"sec-edgar","filing":"0001740374-26-000004","document":"wk-form4_1776375108.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000174037426000004/wk-form4_1776375108.xml","form_type":"4"}},{"id":832818,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":56943,"kind":"person","name":"BARUFFI KUMI YAMAMOTO","position":1,"cik":"0001619728","reported_name":"BARUFFI KUMI YAMAMOTO","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP General Counsel, Corp Sec"}}],"security":"Common Stock","published_at":"2026-03-20T23:26:53.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":937,"price":26.23,"value":24577.51,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4/A amends the Form 4 filed on March 17, 2026 solely to correct the transaction code for the reported disposition from S to F. The transaction represents shares withheld by the issuer to satisfy tax obligations in connection with equity award vesting."}],"balance_after":53715,"source":{"system":"sec-edgar","filing":"0000887343-26-000107","document":"wk-form4a_1774049209.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000107/wk-form4a_1774049209.xml","form_type":"4/A","original_submission_date":"2026-03-17"}},{"id":832817,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":52347,"kind":"person","name":"Lakely Brock","position":1,"cik":"0001740374","reported_name":"Lakely Brock","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2026-03-20T23:25:30.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":211,"price":26.23,"value":5534.53,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4/A amends the Form 4 filed on March 17, 2026 solely to correct the transaction code for the reported disposition from S to F. The transaction represents shares withheld by the issuer to satisfy tax obligations in connection with equity award vesting."}],"balance_after":11104,"source":{"system":"sec-edgar","filing":"0000887343-26-000106","document":"wk-form4a_1774049127.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000106/wk-form4a_1774049127.xml","form_type":"4/A","original_submission_date":"2026-03-17"}},{"id":839824,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":37883,"kind":"person","name":"MACHUCA LUIS","position":1,"cik":"0001133099","reported_name":"MACHUCA LUIS","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Deferred Compensation Phantom Stock","published_at":"2026-03-18T00:50:30.000Z","date":"2026-03-16","kind":"grant","planned":false,"acquired":true,"shares":659,"price":26.83,"value":17680.97,"ownership":{"direct":false,"nature":"Deferred Compensation"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."}],"balance_after":48403,"derivative":{"underlying":"Common","underlying_shares":659},"source":{"system":"sec-edgar","filing":"0001133099-26-000005","document":"wk-form4_1773795028.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000113309926000005/wk-form4_1773795028.xml","form_type":"4"}},{"id":839827,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, CEO, President"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:48:47.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":18171,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 54,511 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 54,511 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 54,511 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":166984,"derivative":{"underlying":"Common Stock","underlying_shares":18171},"source":{"system":"sec-edgar","filing":"0001550429-26-000002","document":"wk-form4_1773794924.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000155042926000002/wk-form4_1773794924.xml","form_type":"4"}},{"id":839826,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, CEO, President"}}],"security":"Common Stock","published_at":"2026-03-18T00:48:47.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":7151,"price":26.23,"value":187570.73,"ownership":{"direct":true},"balance_after":151584,"source":{"system":"sec-edgar","filing":"0001550429-26-000002","document":"wk-form4_1773794924.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000155042926000002/wk-form4_1773794924.xml","form_type":"4"}},{"id":839825,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, CEO, President"}}],"security":"Common Stock","published_at":"2026-03-18T00:48:47.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":18171,"price":26.23,"value":476625.33,"ownership":{"direct":true},"balance_after":158735,"source":{"system":"sec-edgar","filing":"0001550429-26-000002","document":"wk-form4_1773794924.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000155042926000002/wk-form4_1773794924.xml","form_type":"4"}},{"id":839820,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60318,"kind":"person","name":"OGNALL ANDREW H","position":1,"cik":"0001606248","reported_name":"OGNALL ANDREW H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Risk Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:45:59.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":2381,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,142 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,142 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,142 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":53026,"derivative":{"underlying":"Common Stock","underlying_shares":2381},"source":{"system":"sec-edgar","filing":"0001606248-26-000002","document":"wk-form4_1773794756.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/887343/000160624826000002/wk-form4_1773794756.xml","form_type":"4"}},{"id":839819,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60318,"kind":"person","name":"OGNALL ANDREW H","position":1,"cik":"0001606248","reported_name":"OGNALL ANDREW H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Risk Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:45:59.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":951,"price":26.23,"value":24944.73,"ownership":{"direct":true},"balance_after":74132,"source":{"system":"sec-edgar","filing":"0001606248-26-000002","document":"wk-form4_1773794756.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000160624826000002/wk-form4_1773794756.xml","form_type":"4"}},{"id":839818,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60318,"kind":"person","name":"OGNALL ANDREW H","position":1,"cik":"0001606248","reported_name":"OGNALL ANDREW H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Risk Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:45:59.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":2381,"price":26.23,"value":62453.63,"ownership":{"direct":true},"balance_after":75083,"source":{"system":"sec-edgar","filing":"0001606248-26-000002","document":"wk-form4_1773794756.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000160624826000002/wk-form4_1773794756.xml","form_type":"4"}},{"id":839823,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60319,"kind":"person","name":"Namdar Frank","position":1,"cik":"0001759802","reported_name":"Namdar Frank","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Credit Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:39:19.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":2820,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 8,458 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 8,458 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 8,458 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":13640,"derivative":{"underlying":"Common Stock","underlying_shares":2820},"source":{"system":"sec-edgar","filing":"0001759802-26-000008","document":"wk-form4_1773794356.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/887343/000175980226000008/wk-form4_1773794356.xml","form_type":"4"}},{"id":839822,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60319,"kind":"person","name":"Namdar Frank","position":1,"cik":"0001759802","reported_name":"Namdar Frank","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Credit Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:39:19.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":1367,"price":26.23,"value":35856.41,"ownership":{"direct":true},"balance_after":31923,"source":{"system":"sec-edgar","filing":"0001759802-26-000008","document":"wk-form4_1773794356.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000175980226000008/wk-form4_1773794356.xml","form_type":"4"}},{"id":839821,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60319,"kind":"person","name":"Namdar Frank","position":1,"cik":"0001759802","reported_name":"Namdar Frank","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Credit Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:39:19.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":2820,"price":26.23,"value":73968.6,"ownership":{"direct":true},"balance_after":33290,"source":{"system":"sec-edgar","filing":"0001759802-26-000008","document":"wk-form4_1773794356.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000175980226000008/wk-form4_1773794356.xml","form_type":"4"}},{"id":839817,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:35:17.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":940,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 2,819 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 2,819 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 2,819 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":4679,"derivative":{"underlying":"Common Stock","underlying_shares":940},"source":{"system":"sec-edgar","filing":"0001798077-26-000002","document":"wk-form4_1773794114.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179807726000002/wk-form4_1773794114.xml","form_type":"4"}},{"id":839816,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:35:17.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":376,"price":26.23,"value":9862.48,"ownership":{"direct":true},"balance_after":22508,"source":{"system":"sec-edgar","filing":"0001798077-26-000002","document":"wk-form4_1773794114.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179807726000002/wk-form4_1773794114.xml","form_type":"4"}},{"id":839815,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:35:17.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":940,"price":26.23,"value":24656.2,"ownership":{"direct":true},"balance_after":22884,"source":{"system":"sec-edgar","filing":"0001798077-26-000002","document":"wk-form4_1773794114.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179807726000002/wk-form4_1773794114.xml","form_type":"4"}},{"id":839814,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60317,"kind":"person","name":"Merrywell Christopher","position":1,"cik":"0001796657","reported_name":"Merrywell Christopher","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:33:52.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":5013,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 15,037 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 15,037 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 15,037 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":51291,"derivative":{"underlying":"Common Stock","underlying_shares":5013},"source":{"system":"sec-edgar","filing":"0001796657-26-000005","document":"wk-form4_1773794028.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179665726000005/wk-form4_1773794028.xml","form_type":"4"}},{"id":839813,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60317,"kind":"person","name":"Merrywell Christopher","position":1,"cik":"0001796657","reported_name":"Merrywell Christopher","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-03-18T00:33:52.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":1973,"price":26.23,"value":51751.79,"ownership":{"direct":true},"balance_after":44067,"source":{"system":"sec-edgar","filing":"0001796657-26-000005","document":"wk-form4_1773794028.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179665726000005/wk-form4_1773794028.xml","form_type":"4"}},{"id":839812,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60317,"kind":"person","name":"Merrywell Christopher","position":1,"cik":"0001796657","reported_name":"Merrywell Christopher","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-03-18T00:33:52.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":5013,"price":26.23,"value":131490.99,"ownership":{"direct":true},"balance_after":46040,"source":{"system":"sec-edgar","filing":"0001796657-26-000005","document":"wk-form4_1773794028.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179665726000005/wk-form4_1773794028.xml","form_type":"4"}},{"id":839811,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":52347,"kind":"person","name":"Lakely Brock","position":1,"cik":"0001740374","reported_name":"Lakely Brock","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Accounting Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:31:01.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":846,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 2,537 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 2,537 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 2,537 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":9810,"derivative":{"underlying":"Common Stock","underlying_shares":846},"source":{"system":"sec-edgar","filing":"0001740374-26-000002","document":"wk-form4_1773793858.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000174037426000002/wk-form4_1773793858.xml","form_type":"4"}},{"id":839810,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":52347,"kind":"person","name":"Lakely Brock","position":1,"cik":"0001740374","reported_name":"Lakely Brock","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:31:01.000Z","date":"2026-03-13","kind":"sale","planned":false,"acquired":false,"shares":211,"price":26.23,"value":5534.53,"ownership":{"direct":true},"balance_after":11104,"source":{"system":"sec-edgar","filing":"0001740374-26-000002","document":"wk-form4_1773793858.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000174037426000002/wk-form4_1773793858.xml","form_type":"4"}},{"id":839809,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":52347,"kind":"person","name":"Lakely Brock","position":1,"cik":"0001740374","reported_name":"Lakely Brock","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:31:01.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":846,"price":26.23,"value":22190.58,"ownership":{"direct":true},"balance_after":11315,"source":{"system":"sec-edgar","filing":"0001740374-26-000002","document":"wk-form4_1773793858.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000174037426000002/wk-form4_1773793858.xml","form_type":"4"}},{"id":839808,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":33370,"kind":"person","name":"Deer Aaron James","position":1,"cik":"0001810107","reported_name":"Deer Aaron James","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Strategy/Innov Offcr"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:27:37.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":1567,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 4,699 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 4,699 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 4,699 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":7133,"derivative":{"underlying":"Common Stock","underlying_shares":1567},"source":{"system":"sec-edgar","filing":"0001810107-26-000007","document":"wk-form4_1773793655.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000181010726000007/wk-form4_1773793655.xml","form_type":"4"}},{"id":839807,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":33370,"kind":"person","name":"Deer Aaron James","position":1,"cik":"0001810107","reported_name":"Deer Aaron James","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Strategy/Innov Offcr"}}],"security":"Common Stock","published_at":"2026-03-18T00:27:37.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":617,"price":26.23,"value":16183.91,"ownership":{"direct":true},"balance_after":41875,"source":{"system":"sec-edgar","filing":"0001810107-26-000007","document":"wk-form4_1773793655.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000181010726000007/wk-form4_1773793655.xml","form_type":"4"}},{"id":839806,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":33370,"kind":"person","name":"Deer Aaron James","position":1,"cik":"0001810107","reported_name":"Deer Aaron James","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Strategy/Innov Offcr"}}],"security":"Common Stock","published_at":"2026-03-18T00:27:37.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":1567,"price":26.23,"value":41102.41,"ownership":{"direct":true},"balance_after":42492,"source":{"system":"sec-edgar","filing":"0001810107-26-000007","document":"wk-form4_1773793655.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000181010726000007/wk-form4_1773793655.xml","form_type":"4"}},{"id":839805,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":56943,"kind":"person","name":"BARUFFI KUMI YAMAMOTO","position":1,"cik":"0001619728","reported_name":"BARUFFI KUMI YAMAMOTO","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP General Counsel, Corp Sec"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:26:13.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":2381,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,142 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,142 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,142 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":13083,"derivative":{"underlying":"Common Stock","underlying_shares":2381},"source":{"system":"sec-edgar","filing":"0001619728-26-000003","document":"wk-form4_1773793570.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000161972826000003/wk-form4_1773793570.xml","form_type":"4"}},{"id":839804,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":56943,"kind":"person","name":"BARUFFI KUMI YAMAMOTO","position":1,"cik":"0001619728","reported_name":"BARUFFI KUMI YAMAMOTO","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP General Counsel, Corp Sec"}}],"security":"Common Stock","published_at":"2026-03-18T00:26:13.000Z","date":"2026-03-13","kind":"sale","planned":false,"acquired":false,"shares":937,"price":26.23,"value":24577.51,"ownership":{"direct":true},"balance_after":53715,"source":{"system":"sec-edgar","filing":"0001619728-26-000003","document":"wk-form4_1773793570.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000161972826000003/wk-form4_1773793570.xml","form_type":"4"}},{"id":839803,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":56943,"kind":"person","name":"BARUFFI KUMI YAMAMOTO","position":1,"cik":"0001619728","reported_name":"BARUFFI KUMI YAMAMOTO","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP General Counsel, Corp Sec"}}],"security":"Common Stock","published_at":"2026-03-18T00:26:13.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":2381,"price":26.23,"value":62453.63,"ownership":{"direct":true},"balance_after":54652,"source":{"system":"sec-edgar","filing":"0001619728-26-000003","document":"wk-form4_1773793570.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000161972826000003/wk-form4_1773793570.xml","form_type":"4"}},{"id":839802,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60316,"kind":"person","name":"Anderson Drew K","position":1,"cik":"0001955918","reported_name":"Anderson Drew K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Admin Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-03-18T00:24:10.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":2506,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,518 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,518 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 7,518 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":50607,"derivative":{"underlying":"Common Stock","underlying_shares":2506},"source":{"system":"sec-edgar","filing":"0001955918-26-000003","document":"wk-form4_1773793447.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000195591826000003/wk-form4_1773793447.xml","form_type":"4"}},{"id":839801,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60316,"kind":"person","name":"Anderson Drew K","position":1,"cik":"0001955918","reported_name":"Anderson Drew K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Admin Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:24:10.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":1215,"price":26.23,"value":31869.45,"ownership":{"direct":true},"balance_after":21969,"source":{"system":"sec-edgar","filing":"0001955918-26-000003","document":"wk-form4_1773793447.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000195591826000003/wk-form4_1773793447.xml","form_type":"4"}},{"id":839800,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60316,"kind":"person","name":"Anderson Drew K","position":1,"cik":"0001955918","reported_name":"Anderson Drew K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Admin Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:24:10.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":2506,"price":26.23,"value":65732.38,"ownership":{"direct":true},"balance_after":23184,"source":{"system":"sec-edgar","filing":"0001955918-26-000003","document":"wk-form4_1773793447.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000195591826000003/wk-form4_1773793447.xml","form_type":"4"}},{"id":840089,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60342,"kind":"person","name":"Nixon Torran B","position":1,"cik":"0001689701","reported_name":"Nixon Torran B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Restricted Stock Unit","published_at":"2026-03-17T20:43:18.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":false,"shares":5013,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 15,037 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 15,037 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted Stock Units convert into common stock on a one-for-one basis. On February 25, 2025, the reporting person was granted 15,037 Restricted Stock Units, which vest in three annual installments beginning on March 13, 2026."}],"balance_after":49052,"derivative":{"underlying":"Common Stock","underlying_shares":5013},"source":{"system":"sec-edgar","filing":"0001689701-26-000004","document":"wk-form4_1773794595.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1689701/000168970126000004/wk-form4_1773794595.xml","form_type":"4"}},{"id":840088,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60342,"kind":"person","name":"Nixon Torran B","position":1,"cik":"0001689701","reported_name":"Nixon Torran B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-03-17T20:43:18.000Z","date":"2026-03-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":2002,"price":26.23,"value":52512.46,"ownership":{"direct":true},"balance_after":101240,"source":{"system":"sec-edgar","filing":"0001689701-26-000004","document":"wk-form4_1773794595.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1689701/000168970126000004/wk-form4_1773794595.xml","form_type":"4"}},{"id":840087,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60342,"kind":"person","name":"Nixon Torran B","position":1,"cik":"0001689701","reported_name":"Nixon Torran B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-03-17T20:43:18.000Z","date":"2026-03-13","kind":"exercise","planned":false,"acquired":true,"shares":5013,"price":26.23,"value":131490.99,"ownership":{"direct":true},"balance_after":103242,"source":{"system":"sec-edgar","filing":"0001689701-26-000004","document":"wk-form4_1773794595.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1689701/000168970126000004/wk-form4_1773794595.xml","form_type":"4"}},{"id":859982,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60342,"kind":"person","name":"Nixon Torran B","position":1,"cik":"0001689701","reported_name":"Nixon Torran B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-03-05T16:27:54.000Z","date":"2026-03-04","kind":"sale","planned":true,"acquired":false,"shares":2240,"price":28.85,"value":64624.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Open market sale pursuant to a 10B5-1 Plan which was established by Reporting Person on November 25, 2025, in accordance with Rule 10B5-1 of the Securities Exchange Act of 1934, as amended."}],"balance_after":98229,"source":{"system":"sec-edgar","filing":"0000887343-26-000103","document":"wk-form4_1772746071.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1689701/000088734326000103/wk-form4_1772746071.xml","form_type":"4"}},{"id":859981,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60342,"kind":"person","name":"Nixon Torran B","position":1,"cik":"0001689701","reported_name":"Nixon Torran B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-03-05T16:27:54.000Z","date":"2026-03-03","kind":"sale","planned":true,"acquired":false,"shares":2241,"price":28.25,"value":63308.25,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Open market sale pursuant to a 10B5-1 Plan which was established by Reporting Person on November 25, 2025, in accordance with Rule 10B5-1 of the Securities Exchange Act of 1934, as amended."}],"balance_after":100469,"source":{"system":"sec-edgar","filing":"0000887343-26-000103","document":"wk-form4_1772746071.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1689701/000088734326000103/wk-form4_1772746071.xml","form_type":"4"}},{"id":875513,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, President, CEO"}}],"security":"Common Stock","published_at":"2026-03-03T02:09:14.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":9789,"price":28.45,"value":278497.05,"ownership":{"direct":true},"balance_after":140564,"source":{"system":"sec-edgar","filing":"0000887343-26-000102","document":"wk-form4_1772503751.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000102/wk-form4_1772503751.xml","form_type":"4"}},{"id":875509,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60318,"kind":"person","name":"OGNALL ANDREW H","position":1,"cik":"0001606248","reported_name":"OGNALL ANDREW H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Risk Officer"}}],"security":"Common Stock","published_at":"2026-03-03T02:06:55.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":1304,"price":28.45,"value":37098.8,"ownership":{"direct":true},"balance_after":72702,"source":{"system":"sec-edgar","filing":"0000887343-26-000100","document":"wk-form4_1772503612.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000100/wk-form4_1772503612.xml","form_type":"4"}},{"id":875507,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60319,"kind":"person","name":"Namdar Frank","position":1,"cik":"0001759802","reported_name":"Namdar Frank","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Credit Officer"}}],"security":"Common Stock","published_at":"2026-03-03T02:04:51.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":1808,"price":28.45,"value":51437.6,"ownership":{"direct":true},"balance_after":30470,"source":{"system":"sec-edgar","filing":"0001759802-26-000006","document":"wk-form4_1772503488.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000175980226000006/wk-form4_1772503488.xml","form_type":"4"}},{"id":875508,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60317,"kind":"person","name":"Merrywell Christopher","position":1,"cik":"0001796657","reported_name":"Merrywell Christopher","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-03-03T02:03:26.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":3230,"price":28.45,"value":91893.5,"ownership":{"direct":true},"balance_after":41027,"source":{"system":"sec-edgar","filing":"0000887343-26-000098","document":"wk-form4_1772503404.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000098/wk-form4_1772503404.xml","form_type":"4"}},{"id":875506,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":52347,"kind":"person","name":"Lakely Brock","position":1,"cik":"0001740374","reported_name":"Lakely Brock","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2026-03-03T02:02:04.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":391,"price":28.45,"value":11123.95,"ownership":{"direct":true},"balance_after":10469,"source":{"system":"sec-edgar","filing":"0000887343-26-000096","document":"wk-form4_1772503321.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000096/wk-form4_1772503321.xml","form_type":"4"}},{"id":875505,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2026-03-03T02:00:12.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":838,"price":28.45,"value":23841.1,"ownership":{"direct":true},"balance_after":21944,"source":{"system":"sec-edgar","filing":"0000887343-26-000094","document":"wk-form4_1772503207.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000094/wk-form4_1772503207.xml","form_type":"4"}},{"id":875504,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":33370,"kind":"person","name":"Deer Aaron James","position":1,"cik":"0001810107","reported_name":"Deer Aaron James","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Strategy/Innov Offcr"}}],"security":"Common Stock","published_at":"2026-03-03T01:59:06.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":918,"price":28.45,"value":26117.1,"ownership":{"direct":true},"balance_after":40925,"source":{"system":"sec-edgar","filing":"0001810107-26-000005","document":"wk-form4_1772503143.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000181010726000005/wk-form4_1772503143.xml","form_type":"4"}},{"id":875503,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":56943,"kind":"person","name":"BARUFFI KUMI YAMAMOTO","position":1,"cik":"0001619728","reported_name":"BARUFFI KUMI YAMAMOTO","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP General Counsel, Corp Sec"}}],"security":"Common Stock","published_at":"2026-03-03T01:57:16.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":1799,"price":28.45,"value":51181.55,"ownership":{"direct":true},"balance_after":52271,"source":{"system":"sec-edgar","filing":"0000887343-26-000092","document":"wk-form4_1772503034.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000092/wk-form4_1772503034.xml","form_type":"4"}},{"id":875502,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60316,"kind":"person","name":"Anderson Drew K","position":1,"cik":"0001955918","reported_name":"Anderson Drew K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Admin Officer"}}],"security":"Common Stock","published_at":"2026-03-03T01:52:53.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":1808,"price":28.45,"value":51437.6,"ownership":{"direct":true},"balance_after":20678,"source":{"system":"sec-edgar","filing":"0000887343-26-000090","document":"wk-form4_1772502771.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000090/wk-form4_1772502771.xml","form_type":"4"}},{"id":875791,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60342,"kind":"person","name":"Nixon Torran B","position":1,"cik":"0001689701","reported_name":"Nixon Torran B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-03-02T21:05:50.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":2980,"price":28.45,"value":84781.0,"ownership":{"direct":true},"balance_after":102710,"source":{"system":"sec-edgar","filing":"0001689701-26-000002","document":"wk-form4_1772503547.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1689701/000168970126000002/wk-form4_1772503547.xml","form_type":"4"}},{"id":891701,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, President, CEO"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:46:59.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":56017,"price":31.24,"value":1749971.08,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":185155,"derivative":{"underlying":"Common Stock","underlying_shares":56017},"source":{"system":"sec-edgar","filing":"0000887343-26-000083","document":"wk-form4_1771634817.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000083/wk-form4_1771634817.xml","form_type":"4"}},{"id":891700,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":65527,"kind":"person","name":"Seda Ivan A","position":1,"cik":"0002099171","reported_name":"Seda Ivan A","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Financial Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:45:11.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":12804,"price":31.24,"value":399996.96,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":12804,"derivative":{"underlying":"Common Stock","underlying_shares":12804},"source":{"system":"sec-edgar","filing":"0002099171-26-000002","document":"wk-form4_1771634709.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000209917126000002/wk-form4_1771634709.xml","form_type":"4"}},{"id":891699,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60318,"kind":"person","name":"OGNALL ANDREW H","position":1,"cik":"0001606248","reported_name":"OGNALL ANDREW H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Risk Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:38:22.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":8002,"price":31.24,"value":249982.48,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":55407,"derivative":{"underlying":"Common Stock","underlying_shares":8002},"source":{"system":"sec-edgar","filing":"0000887343-26-000081","document":"wk-form4_1771634300.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000081/wk-form4_1771634300.xml","form_type":"4"}},{"id":891698,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60319,"kind":"person","name":"Namdar Frank","position":1,"cik":"0001759802","reported_name":"Namdar Frank","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Credit Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:34:42.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":8002,"price":31.24,"value":249982.48,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":16460,"derivative":{"underlying":"Common Stock","underlying_shares":8002},"source":{"system":"sec-edgar","filing":"0001759802-26-000004","document":"wk-form4_1771634079.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000175980226000004/wk-form4_1771634079.xml","form_type":"4"}},{"id":891697,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:31:37.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":2800,"price":31.24,"value":87472.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":5619,"derivative":{"underlying":"Common Stock","underlying_shares":2800},"source":{"system":"sec-edgar","filing":"0000887343-26-000077","document":"wk-form4_1771633894.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000077/wk-form4_1771633894.xml","form_type":"4"}},{"id":891696,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60317,"kind":"person","name":"Merrywell Christopher","position":1,"cik":"0001796657","reported_name":"Merrywell Christopher","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:30:12.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":16645,"price":31.24,"value":519989.8,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":56304,"derivative":{"underlying":"Common Stock","underlying_shares":16645},"source":{"system":"sec-edgar","filing":"0000887343-26-000075","document":"wk-form4_1771633810.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000075/wk-form4_1771633810.xml","form_type":"4"}},{"id":891695,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":52347,"kind":"person","name":"Lakely Brock","position":1,"cik":"0001740374","reported_name":"Lakely Brock","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Chief Accounting Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:25:57.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":5601,"price":31.24,"value":174975.24,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":10656,"derivative":{"underlying":"Common Stock","underlying_shares":5601},"source":{"system":"sec-edgar","filing":"0000887343-26-000073","document":"wk-form4_1771633554.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000073/wk-form4_1771633554.xml","form_type":"4"}},{"id":891694,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":22531,"kind":"person","name":"Giem Judi","position":1,"cik":"0001813483","reported_name":"Giem Judi","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP CHRO"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:24:17.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":8322,"price":31.24,"value":259979.28,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":15501,"derivative":{"underlying":"Common Stock","underlying_shares":8322},"source":{"system":"sec-edgar","filing":"0000887343-26-000071","document":"wk-form4_1771633454.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000071/wk-form4_1771633454.xml","form_type":"4"}},{"id":891693,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":33370,"kind":"person","name":"Deer Aaron James","position":1,"cik":"0001810107","reported_name":"Deer Aaron James","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Strategy/Innov Offcr"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:22:45.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":4001,"price":31.24,"value":124991.24,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":8700,"derivative":{"underlying":"Common Stock","underlying_shares":4001},"source":{"system":"sec-edgar","filing":"0000887343-26-000069","document":"wk-form4_1771633363.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000069/wk-form4_1771633363.xml","form_type":"4"}},{"id":891692,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":56943,"kind":"person","name":"BARUFFI KUMI YAMAMOTO","position":1,"cik":"0001619728","reported_name":"BARUFFI KUMI YAMAMOTO","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP General Counsel, Corp Sec"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:21:01.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":8322,"price":31.24,"value":259979.28,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":15464,"derivative":{"underlying":"Common Stock","underlying_shares":8322},"source":{"system":"sec-edgar","filing":"0000887343-26-000067","document":"wk-form4_1771633258.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000067/wk-form4_1771633258.xml","form_type":"4"}},{"id":891684,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60316,"kind":"person","name":"Anderson Drew K","position":1,"cik":"0001955918","reported_name":"Anderson Drew K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Admin Officer"}}],"security":"Restricted Stock Unit","published_at":"2026-02-21T00:19:27.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":8002,"price":31.24,"value":249982.48,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":53113,"derivative":{"underlying":"Common Stock","underlying_shares":8002},"source":{"system":"sec-edgar","filing":"0000887343-26-000065","document":"wk-form4_1771633164.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000065/wk-form4_1771633164.xml","form_type":"4"}},{"id":891823,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60342,"kind":"person","name":"Nixon Torran B","position":1,"cik":"0001689701","reported_name":"Nixon Torran B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Restricted Stock Unit","published_at":"2026-02-20T19:36:01.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":16645,"price":31.24,"value":519989.8,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Restricted stock units granted 02/18/2026. The grant will vest 33.33% per year over three years."}],"balance_after":54065,"derivative":{"underlying":"Common Stock","underlying_shares":16645},"source":{"system":"sec-edgar","filing":"0000887343-26-000079","document":"wk-form4_1771634158.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1689701/000088734326000079/wk-form4_1771634158.xml","form_type":"4"}},{"id":898608,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, President, CEO"}}],"security":"Common Stock","published_at":"2026-02-18T23:34:53.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":3922,"price":31.49,"value":123503.78,"ownership":{"direct":true},"balance_after":150353,"source":{"system":"sec-edgar","filing":"0000887343-26-000063","document":"wk-form4_1771457691.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000063/wk-form4_1771457691.xml","form_type":"4"}},{"id":898609,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60318,"kind":"person","name":"OGNALL ANDREW H","position":1,"cik":"0001606248","reported_name":"OGNALL ANDREW H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Risk Officer"}}],"security":"Common Stock","published_at":"2026-02-18T23:33:45.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":931,"price":31.49,"value":29317.19,"ownership":{"direct":true},"balance_after":74006,"source":{"system":"sec-edgar","filing":"0000887343-26-000061","document":"wk-form4_1771457622.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000061/wk-form4_1771457622.xml","form_type":"4"}},{"id":898607,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60319,"kind":"person","name":"Namdar Frank","position":1,"cik":"0001759802","reported_name":"Namdar Frank","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Credit Officer"}}],"security":"Common Stock","published_at":"2026-02-18T23:31:05.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":1169,"price":31.49,"value":36811.81,"ownership":{"direct":true},"balance_after":32278,"source":{"system":"sec-edgar","filing":"0000887343-26-000057","document":"wk-form4_1771457462.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000057/wk-form4_1771457462.xml","form_type":"4"}},{"id":898606,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2026-02-18T23:29:37.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":485,"price":31.49,"value":15272.65,"ownership":{"direct":true},"balance_after":22782,"source":{"system":"sec-edgar","filing":"0000887343-26-000055","document":"wk-form4_1771457374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000055/wk-form4_1771457374.xml","form_type":"4"}},{"id":898605,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60317,"kind":"person","name":"Merrywell Christopher","position":1,"cik":"0001796657","reported_name":"Merrywell Christopher","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-02-18T23:28:34.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":1706,"price":31.49,"value":53721.94,"ownership":{"direct":true},"balance_after":44257,"source":{"system":"sec-edgar","filing":"0000887343-26-000053","document":"wk-form4_1771457312.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000053/wk-form4_1771457312.xml","form_type":"4"}},{"id":898604,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":33370,"kind":"person","name":"Deer Aaron James","position":1,"cik":"0001810107","reported_name":"Deer Aaron James","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Strategy/Innov Offcr"}}],"security":"Common Stock","published_at":"2026-02-18T23:27:32.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":531,"price":31.49,"value":16721.19,"ownership":{"direct":true},"balance_after":41843,"source":{"system":"sec-edgar","filing":"0000887343-26-000051","document":"wk-form4_1771457248.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000051/wk-form4_1771457248.xml","form_type":"4"}},{"id":898603,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":56943,"kind":"person","name":"BARUFFI KUMI YAMAMOTO","position":1,"cik":"0001619728","reported_name":"BARUFFI KUMI YAMAMOTO","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP General Counsel, Corp Sec"}}],"security":"Common Stock","published_at":"2026-02-18T23:26:09.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":1036,"price":31.49,"value":32623.64,"ownership":{"direct":true},"balance_after":54070,"source":{"system":"sec-edgar","filing":"0000887343-26-000049","document":"wk-form4_1771457166.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000049/wk-form4_1771457166.xml","form_type":"4"}},{"id":898602,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60316,"kind":"person","name":"Anderson Drew K","position":1,"cik":"0001955918","reported_name":"Anderson Drew K","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Admin Officer"}}],"security":"Common Stock","published_at":"2026-02-18T23:25:04.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":788,"price":31.49,"value":24814.12,"ownership":{"direct":true},"balance_after":22486,"source":{"system":"sec-edgar","filing":"0000887343-26-000047","document":"wk-form4_1771457102.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000047/wk-form4_1771457102.xml","form_type":"4"}},{"id":899086,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60342,"kind":"person","name":"Nixon Torran B","position":1,"cik":"0001689701","reported_name":"Nixon Torran B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-02-18T18:32:23.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":1905,"price":31.49,"value":59988.45,"ownership":{"direct":true},"balance_after":105690,"source":{"system":"sec-edgar","filing":"0000887343-26-000059","document":"wk-form4_1771457541.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1689701/000088734326000059/wk-form4_1771457541.xml","form_type":"4"}},{"id":918302,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":37883,"kind":"person","name":"MACHUCA LUIS","position":1,"cik":"0001133099","reported_name":"MACHUCA LUIS","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Deferred Compensation Phantom Stock","published_at":"2026-02-06T00:07:27.000Z","date":"2026-02-04","kind":"grant","planned":false,"acquired":true,"shares":562,"price":31.12,"value":17489.44,"ownership":{"direct":false,"nature":"Deferred Compensation"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."}],"balance_after":47744,"derivative":{"underlying":"Common","underlying_shares":562},"source":{"system":"sec-edgar","filing":"0001133099-26-000003","document":"wk-form4_1770336444.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000113309926000003/wk-form4_1770336444.xml","form_type":"4"}},{"id":918301,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":37883,"kind":"person","name":"MACHUCA LUIS","position":1,"cik":"0001133099","reported_name":"MACHUCA LUIS","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Deferred Compensation Phantom Stock","published_at":"2026-02-06T00:07:27.000Z","date":"2025-12-03","kind":"grant","planned":false,"acquired":true,"shares":65,"price":28.17,"value":1831.05,"ownership":{"direct":false,"nature":"Deferred Compensation"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and the result of a transaction by the plan administrator that the reporting person did not request and that they were not aware of at the time of the transaction. The phantom stock will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and the result of a transaction by the plan administrator that the reporting person did not request and that they were not aware of at the time of the transaction. The phantom stock will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The deferred compensation plan phantom stock was accrued under the Registrant's deferred compensation plan and the result of a transaction by the plan administrator that the reporting person did not request and that they were not aware of at the time of the transaction. The phantom stock will be paid in accordance with the terms of the deferred compensation plan following the end of the reporting person's employment with the Registrant."}],"balance_after":47182,"derivative":{"underlying":"Common","underlying_shares":65},"source":{"system":"sec-edgar","filing":"0001133099-26-000003","document":"wk-form4_1770336444.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000113309926000003/wk-form4_1770336444.xml","form_type":"4"}},{"id":920221,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, President, CEO"}}],"security":"Common Stock","published_at":"2026-02-05T00:03:59.000Z","date":"2026-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":8653,"price":29.69,"value":256907.57,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the shares granted pursuant to the terms of the performance restricted stock units vesting."}],"balance_after":154275,"source":{"system":"sec-edgar","filing":"0000887343-26-000036","document":"wk-form4_1770249836.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000036/wk-form4_1770249836.xml","form_type":"4"}},{"id":920220,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, President, CEO"}}],"security":"Common Stock","published_at":"2026-02-05T00:03:59.000Z","date":"2026-02-02","kind":"grant","planned":false,"acquired":true,"shares":21988,"price":29.69,"value":652823.72,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Shares granted pursuant to the terms of the performance restricted stock units granted on March 15, 2023, which vested on February 2, 2026 based on to the issuer's relative return on tangible common equity for fiscal years 2023-2025 compared to a Compensation Committee approved group of peers."}],"balance_after":162928,"source":{"system":"sec-edgar","filing":"0000887343-26-000036","document":"wk-form4_1770249836.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000036/wk-form4_1770249836.xml","form_type":"4"}},{"id":920219,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, President, CEO"}}],"security":"Common Stock","published_at":"2026-02-05T00:03:59.000Z","date":"2026-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":11383,"price":29.69,"value":337961.27,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the shares granted pursuant to the terms of the performance restricted stock units vesting."}],"balance_after":140940,"source":{"system":"sec-edgar","filing":"0000887343-26-000036","document":"wk-form4_1770249836.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000036/wk-form4_1770249836.xml","form_type":"4"}},{"id":920218,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60320,"kind":"person","name":"Stein Clint","position":1,"cik":"0001550429","reported_name":"Stein Clint","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chair, President, CEO"}}],"security":"Common Stock","published_at":"2026-02-05T00:03:59.000Z","date":"2026-02-02","kind":"grant","planned":false,"acquired":true,"shares":28927,"price":29.69,"value":858842.63,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares granted pursuant to the terms of the performance restricted stock units granted on February 21, 2023, which vested on February 2, 2026 based on to the issuer's relative return on tangible common equity for fiscal years 2023-2025 compared to a Compensation Committee approved group of peers."}],"balance_after":152323,"source":{"system":"sec-edgar","filing":"0000887343-26-000036","document":"wk-form4_1770249836.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000036/wk-form4_1770249836.xml","form_type":"4"}},{"id":920217,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60318,"kind":"person","name":"OGNALL ANDREW H","position":1,"cik":"0001606248","reported_name":"OGNALL ANDREW H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Risk Officer"}}],"security":"Common Stock","published_at":"2026-02-05T00:02:48.000Z","date":"2026-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":1929,"price":29.69,"value":57272.01,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the shares granted pursuant to the terms of the performance restricted stock units vesting."}],"balance_after":74937,"source":{"system":"sec-edgar","filing":"0000887343-26-000034","document":"wk-form4_1770249765.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000034/wk-form4_1770249765.xml","form_type":"4"}},{"id":920216,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60318,"kind":"person","name":"OGNALL ANDREW H","position":1,"cik":"0001606248","reported_name":"OGNALL ANDREW H","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Risk Officer"}}],"security":"Common Stock","published_at":"2026-02-05T00:02:48.000Z","date":"2026-02-02","kind":"grant","planned":false,"acquired":true,"shares":4510,"price":29.69,"value":133901.9,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares granted pursuant to the terms of the performance restricted stock units granted on February 21, 2023,  which vested on February 2, 2026 based on to the issuer's relative return on tangible common equity for fiscal years 2023-2025 compared to a Compensation Committee approved group of peers."}],"balance_after":76866,"source":{"system":"sec-edgar","filing":"0000887343-26-000034","document":"wk-form4_1770249765.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000034/wk-form4_1770249765.xml","form_type":"4"}},{"id":920215,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60319,"kind":"person","name":"Namdar Frank","position":1,"cik":"0001759802","reported_name":"Namdar Frank","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Credit Officer"}}],"security":"Common Stock","published_at":"2026-02-05T00:00:50.000Z","date":"2026-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":2383,"price":29.69,"value":70751.27,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the shares granted pursuant to the terms of the performance restricted stock units vesting."}],"balance_after":33447,"source":{"system":"sec-edgar","filing":"0001759802-26-000002","document":"wk-form4_1770249647.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000175980226000002/wk-form4_1770249647.xml","form_type":"4"}},{"id":920214,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60319,"kind":"person","name":"Namdar Frank","position":1,"cik":"0001759802","reported_name":"Namdar Frank","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Credit Officer"}}],"security":"Common Stock","published_at":"2026-02-05T00:00:50.000Z","date":"2026-02-02","kind":"grant","planned":false,"acquired":true,"shares":4667,"price":29.69,"value":138563.23,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares granted pursuant to the terms of the performance restricted stock units granted on February 21, 2023, which vested on February 2, 2026 based on to the issuer's relative return on tangible common equity for fiscal years 2023-2025 compared to a Compensation Committee approved group of peers."}],"balance_after":35830,"source":{"system":"sec-edgar","filing":"0001759802-26-000002","document":"wk-form4_1770249647.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000175980226000002/wk-form4_1770249647.xml","form_type":"4"}},{"id":920213,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2026-02-04T23:59:15.000Z","date":"2026-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":965,"price":29.69,"value":28650.85,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the shares granted pursuant to the terms of the performance restricted stock units vesting."}],"balance_after":23267,"source":{"system":"sec-edgar","filing":"0000887343-26-000030","document":"wk-form4_1770249552.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000030/wk-form4_1770249552.xml","form_type":"4"}},{"id":920212,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":39849,"kind":"person","name":"Moore Devine David","position":1,"cik":"0001798077","reported_name":"Moore Devine David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP Chief Marketing Officer"}}],"security":"Common Stock","published_at":"2026-02-04T23:59:15.000Z","date":"2026-02-02","kind":"grant","planned":false,"acquired":true,"shares":2095,"price":29.69,"value":62200.55,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares granted pursuant to the terms of the performance restricted stock units granted on February 21, 2023, which vested on February 2, 2026 based on to the issuer's relative return on tangible common equity for fiscal years 2023-2025 compared to a Compensation Committee approved group of peers."}],"balance_after":24232,"source":{"system":"sec-edgar","filing":"0000887343-26-000030","document":"wk-form4_1770249552.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/887343/000088734326000030/wk-form4_1770249552.xml","form_type":"4"}},{"id":920211,"issuer":{"id":707,"kind":"organization","name":"COLUMBIA BANKING SYSTEM, INC.","symbol":"COLB"},"owners":[{"id":60317,"kind":"person","name":"Merrywell Christopher","position":1,"cik":"0001796657","reported_name":"Merrywell Christopher","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Executive VP"}}],"security":"Common Stock","published_at":"2026-02-04T23:56:44.000Z","date":"2026-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":4949,"price":29.69,"value":146935.81,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents withholding of shares of common stock to satisfy the reporting person's tax withholding obligations in connection with the shares granted pursuant to the terms of the performance restricted stock units vesting."}],"balance_after":45963,"source":{"system":"sec-edgar","filing":"0001796657-26-000002","document":"wk-form4_1770249401.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/887343/000179665726000002/wk-form4_1770249401.xml","form_type":"4"}}],"next_cursor":"2026-02-04T23:56:44.000000Z,920211"}