$COLB

$30.72 -$0.32 (1.03%) Close

$COLB Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 282.9M shares outstanding

Who owns COLB?

By type of holder

Institutions 95.0% Insiders 0.9% Everyone else 4.0%

Concentration Top 10 holders own 48.4%

BlackRock, Inc. 9.7% · T. Rowe Price Investment Management, Inc. 5.5%

Institutional ownership

95.0%

-2.8 pts vs last qtr

Institutional holders

553

+24 vs last qtr

Net shares bought

−8.0M

by institutions in Q2 2026

New / sold out

83 / 59

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +3.0M
Mackenzie Financial Corp +2.0M

Biggest sellers in Q2 2026

Bank of New York Mellon Corp −3.6M
Wellington Management Group LLP −3.3M

Who is planning to sell?

Notices of proposed sale, last 12 months

$647K

4 notices from 3 people

Shares covered

22.1K

0.01% of the company

Arranged in advance

20%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Gardner Steven R Director $404K
Nixon Torran B Officer 10b5-1 $128K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+318.1%

+17.23% a year

Each share's claim on the business

−76.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$278M vs $133M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years61% 3–5 years18% 1–3 years12% Under 1 year10%

Quarterly turnover

9.2%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting COLB on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	27.5M	9.71%	+405.9K (+1.5%)	≤2021	0.0%
Shares held by quarter Peak holding27.5M (Q2'26) Change over 8 quarters+9.4M Share of the company9.710% BlackRock, Inc.'s full portfolio →
TR T. Rowe Price Investment Management, Inc.	15.6M	5.53%	−281.6K (−1.8%)	2022	0.3%
Shares held by quarter Peak holding20.2M (Q4'25) Change over 8 quarters+3.0M Share of the company5.530% T. Rowe Price Investment Management, Inc.'s full portfolio →

BlackRock, Inc.

27.5M

% of company

9.71%

Change vs last qtr

+405.9K (+1.5%)

Held since

≤2021

T. Rowe Price Investment Management, Inc.

15.6M

% of company

5.53%

Change vs last qtr

−281.6K (−1.8%)

Held since

2022

28 more super investors behind a free account

See every manager holding Columbia Banking System Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting COLB on Form N-PORT; together they hold 50.5% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Mid-Cap ETF iShares Trust	$318M	9.9M	3.50%	0.26%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$295M	9.2M	3.25%	0.01%	June 30, 2026

iShares Core S&P Mid-Cap ETF

iShares Trust

Position value

$318M

% of company

3.50%

% of the fund

0.26%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$295M

% of company

3.25%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Columbia Banking System Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
GS Gardner Steven R Insider	911.2K	0.32%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.320% Gardner Steven R's insider activity →
OC O'Haver Cort L Insider	390.8K	0.14%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.140% O'Haver Cort L's insider activity →

Gardner Steven R

Insider

911.2K

% of company

0.32%

Change vs last qtr

—

Held since

—

O'Haver Cort L

Insider

390.8K

% of company

0.14%

Change vs last qtr

—

Held since

—

28 more holders behind a free account

See every insider and 5%+ holder of Columbia Banking System Inc.

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