COLUMBIA BANKING SYSTEM, INC.

COLB

Form 4 • Statement of Changes in Beneficial Ownership

SEC Accession Number: 0000887343-26-000103
Filing date: Mar 5, 2026
Earliest execution date: Mar 3, 2026
Reporting Owners: Nixon Torran B (Senior Executive VP)
SEC Filing link

Summary

Type

Sell

Net shares

-4,481

% of shares

-4.14%

Amount (USD)

$127,932

Insider confidence score

38.8 out of 100

Positive

  • Under Rule 10b5-1 trading plan

Negative

  • Significant scheduled sell (<5% of shares)
  • Significant sell amount ($50K+)

Stock transactions

Transaction 1

Security

Common Stock

Action

Sell

Date

2026-03-03

Code

S

Net shares

-2,241.0

Price per Share

$28.25

Amount (USD)

$63,308.25

Acquired/Disposed

Disposed

Shares Owned Before

102,710.0

Shares Owned After

100,469.0

Transaction 2

Security

Common Stock

Action

Sell

Date

2026-03-04

Code

S

Net shares

-2,240.0

Price per Share

$28.85

Amount (USD)

$64,624.00

Acquired/Disposed

Disposed

Shares Owned Before

100,469.0

Shares Owned After

98,229.0

Filing's footnotes

1. Open market sale pursuant to a 10B5-1 Plan which was established by Reporting Person on November 25, 2025, in accordance with Rule 10B5-1 of the Securities Exchange Act of 1934, as amended.

ℹ️ Filed under Rule 10b5-1 trading plan

This page is for informational purposes only. While we strive for accuracy, the summary may contain inaccuracies or omissions. Please refer to the official SEC filing for authoritative information. Open the SEC filing.