Arkolith/Insider Trading/COLB/Form 4

Anderson Drew K

EVP Chief Admin OfficerCOLUMBIA BANKING SYSTEM, INC. (COLB) · full profile →Form 4 · filed Mar 17, 2026
No Open-Market Flow
Open-Market Buys
$0
Open-Market Sells
$0
Net Open-Market Flow
$0
Transactions
3
2 non-derivative · 1 derivative

Non-Derivative Transactions (Table I)

DateActionSharesPriceValueOwned After
Mar 13, 2026Tax withholding(F)1K$26.23$32K22K
Mar 13, 2026Option exercise(M)3K$26.23$66K23K

Derivative Transactions (Table II)

DateActionSharesPriceValueOwned After
Mar 13, 2026Option exercise(M)3K—$051K

Transaction Codes

F
Shares withheld for taxes
M
Option exercise / conversion

Data Source & Provenance

Parsed from a single SEC EDGAR Form 4 filing (accession 0001955918-26-000003) within minutes of acceptance. Every field above traces to the original document. Verify it directly:

View original filing on SEC.govRaw Form 4 XML