COLB Columbia Banking System, Inc.

NASDAQ
$29.72

Columbia Banking System, Inc. (COLB) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal In line Selling ran in line with COLB's own trailing one-year pace, with 19% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 1 buyer in the last 90 days 0 sellers in the last 90 days
Insiders buying
1
1 transaction
Insiders selling
5
7 transactions
Purchases
$22.5K
886 shares
Sales
$677.3K
23,226 shares
Net activity
-$654.8K
purchases less sales

How much of that selling was preplanned? 19% planned / 81% discretionary

10b5-1 plan sales $127.9K 2 transactions · 4,481 shares
Discretionary sales $549.3K 5 transactions · 18,745 shares

Largest single sale: $403.9K.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: June 30, 2026 , by Deer Aaron James .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Deer Aaron James EVP Chief Strategy/Innov Offcr Buy 886 $25.37 $22.5K 42,761
Moore Devine David 2 fills EVP Chief Marketing Officer Sell 3,872 $29.77 $115.3K 22,448 −14.7% of holding
BARUFFI KUMI YAMAMOTO EVP General Counsel, Corp Sec Sell 937 $26.23 $24.6K 53,715 −1.7% of holding
Lakely Brock EVP, Chief Accounting Officer Sell 211 $26.23 $5.5K 11,104 −1.9% of holding
Nixon Torran B Senior Executive VP Sell 10b5-1 2,240 $28.85 $64.6K 98,229 −2.2% of holding
Nixon Torran B Senior Executive VP Sell 10b5-1 2,241 $28.25 $63.3K 100,469 −2.2% of holding
GARDNER STEVEN R Director Sell 13,725 $29.43 $403.9K None left

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.