SEC Form 4 reporting owner

Baruffi Kumi Yamamoto

Baruffi Kumi Yamamoto has filed 9 Form 4 transactions reported between January 20, 2026 and March 13, 2026, as EVP General Counsel, Corp Sec of COLUMBIA BANKING SYSTEM, INC..

Name as filed: BARUFFI KUMI YAMAMOTO

Open-market buys, 24 mo

None

reported

Open-market sales, 24 mo

$25K

1 lines

Companies

with Form 4 filings

Latest transaction

Mar 13, 2026

transaction date

Roles and reported holdings

COLBCOLUMBIA BANKING SYSTEM, INC.
Jan 20, 2026 – Mar 13, 2026
EVP General Counsel, Corp Sec
Held directly53,715 sh as of Mar 13, 2026 · Form 4
24 months: $25K sold

Transaction history

All 9 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

Date	Company	Type	Shares	Price	Value	Owned after	Filing
Mar 13, 2026	COLBEVP General Counsel, Corp Sec	Open-market saleCode S · direct	937	$26.23	$25K@ $26.23	53,715	Form 4
Mar 13, 2026	COLBEVP General Counsel, Corp Sec	Option exerciseCode M · direct	2,381	$26.23	$62K@ $26.23	54,652	Form 4
Mar 1, 2026	COLBEVP General Counsel, Corp Sec	Shares withheld for tax or exercise priceCode F · direct	1,799	$28.45	$51K@ $28.45	52,271	Form 4
Feb 18, 2026	COLBEVP General Counsel, Corp Sec	Grant or awardCode A · direct	8,322	$31.24	$260K@ $31.24	15,464	Form 4
Feb 15, 2026	COLBEVP General Counsel, Corp Sec	Shares withheld for tax or exercise priceCode F · direct	1,036	$31.49	$33K@ $31.49	54,070	Form 4
Feb 2, 2026	COLBEVP General Counsel, Corp Sec	Shares withheld for tax or exercise priceCode F · direct	2,110	$29.69	$63K@ $29.69	55,106	Form 4
Feb 2, 2026	COLBEVP General Counsel, Corp Sec	Grant or awardCode A · direct	5,093	$29.69	$151K@ $29.69	57,216	Form 4
Jan 20, 2026	COLBEVP General Counsel, Corp Sec	Shares withheld for tax or exercise priceCode F · direct	1,508	$28.35	$43K@ $28.35	52,123	Form 4
Jan 20, 2026	COLBEVP General Counsel, Corp Sec	Disposition to issuerCode D · direct	632	—	—	53,631	Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.