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SEC Form 4 research

COLUMBIA BANKING SYSTEM, INC. insider transactions

Inspect COLUMBIA BANKING SYSTEM, INC.'s public SEC insider acquisitions and sales, reporting owners and source receipts.

As of 2026-10-15T08:02:39.132Z

Issuer CIK
0000887343
Reporting owners
59
Officers and directors
22
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What is a Form 4?

Animation: what a Form 4 is, shown with one real example. Sonic Automotive (SAH) reporting owner Paul P. Rusnak bought 13,701 shares at $59.78 on Wednesday, October 7, 2026, transaction code P, an open-market purchase (S is a sale and A is an award from the company). A timeline marks the SEC's two-business-day filing deadline, which ends Friday, October 9. The SEC accepted the Form 4 at 4:33:21 PM ET on October 9, and NexusTrade treats it as public one minute later, at 4:34:21 PM ET. A lamp for NexusTrade's InsiderTrades indicator stays off from the trade date until that moment, then counts one purchase worth 13,701 × $59.78 = $819,045.78.
In this example the shares were bought on Oct 7, 2026, and NexusTrade's InsiderTrades indicator can count the purchase starting at 4:34:21 PM ET on Oct 9, one minute after the SEC accepted the Form 4.

A Form 4 is the SEC filing a company insider, such as an officer, director or 10% owner, uses to report a trade in the company's stock, generally within two business days. The animation follows one real filing as an example: Paul P. Rusnak's purchase of Sonic Automotive (SAH) shares on October 7, 2026.

The same reading applies to every row on this page. The trade date is when the shares changed hands. The available date is when NexusTrade treats the filing as public, and a NexusTrade InsiderTrades indicator counts a purchase (code P) or sale (code S) only from that moment. Code A awards are not counted as purchases.

Read one actual disclosure before using it

Show the table · 1 row, 7 columns

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2026-09-152026-09-14MACHUCA LUISA594$30.48Not reported

First displayed source row from Recent insider disclosures. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-09-14 and its public availability date is 2026-09-15. Subtracting those calendar dates gives 1 day of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code A: a award. An award is an acquisition but is not an open-market purchase. A purchase-following rule must not count it as code P.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC accession 0000887343-26-000178 ↗SEC accession 0001267342-26-000003 ↗SEC accession 0001084960-26-000007 ↗

Recent insider disclosures

This table includes purchases, sales and awards in the public filing record. Awards and open-market purchases are distinct transaction codes. For historical research, use the public availability date to determine when the transaction was knowable.

Read code P as a purchase, S as a sale and A as an award. An award is an acquisition, but it is not an open-market purchase. Open the filing receipt to check the transaction details.

Show the table · 3 rows, 7 columns

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2026-09-152026-09-14MACHUCA LUISA594$30.48Not reported
2026-09-082026-09-04GARDNER STEVEN RA2,577$0Not reported
2026-09-052026-09-02LAGOMARSINO SIMONEA2,670$0Not reported

Most recent 90-day source activity, up to 50 rows. No rows means no matching recent records, not no historical activity.

Officers and directors in the directory

Inspect all 29 displayed rows: Officers and directors in the directory

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SCHULTZ JOHN F000154893346
Deer Aaron James00018101073
Nixon Torran B000168970110
Finkelstein Mark A00015378736
Numata S Mae Fujita00013797155
EERKES CRAIG D000127836714
MACHUCA LUIS00011330994
FARNSWORTH RON L000132228910
GARDNER STEVEN R000126734238
BARUFFI KUMI YAMAMOTO00016197281
DRESSEL MELANIE J000118664024
FOLSOM JOHN00011866461
Forrest Eric00016103871
HULBERT TOM00011866506
Lantow Michelle00014800012
Lund Randal Lee00017132581
McDonald Andy00012920589
Merrywell Christopher00017966571
Moore Devine David00017980772
NELSON MARK W00012024588
Ray Barry S00016324602
REGIS DANIEL C00012293677
Roberts Kent000139794814
SCHMINKEY GARY R00011866567
SEATON ELIZABETH WHITEHEAD00016102171
Stein Clint000155042920
WEYERHAEUSER WILLIAM T00010569163
WHITNEY EVANS Q00011866596
WILL JAMES M00011866613
SCHULTZ JOHN F ↗Deer Aaron James ↗Nixon Torran B ↗Finkelstein Mark A ↗Numata S Mae Fujita ↗EERKES CRAIG D ↗MACHUCA LUIS ↗FARNSWORTH RON L ↗GARDNER STEVEN R ↗BARUFFI KUMI YAMAMOTO ↗DRESSEL MELANIE J ↗FOLSOM JOHN ↗Forrest Eric ↗HULBERT TOM ↗Lantow Michelle ↗Lund Randal Lee ↗McDonald Andy ↗Merrywell Christopher ↗Moore Devine David ↗NELSON MARK W ↗Ray Barry S ↗REGIS DANIEL C ↗Roberts Kent ↗SCHMINKEY GARY R ↗SEATON ELIZABETH WHITEHEAD ↗Stein Clint ↗WEYERHAEUSER WILLIAM T ↗WHITNEY EVANS Q ↗WILL JAMES M ↗

Which transactions qualify for the company tracker

The company strategy uses verified officers and directors with qualifying acquisitions at this issuer. Other reporting owners may appear in source records without becoming strategy signals.

Strategy eligibility is held while filing coverage is unresolved.

Historical follower simulations are separate from these source transactions. They do not establish live trading results.