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CIK 0000887343 · Large accelerated filer

COLUMBIA BANKING SYSTEM, INC.

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Ticker
COLB
Exchange
Nasdaq
Industry
State Commercial Banks
FY end
Dec 31
Incorporated
WA
Entity type
operating
EIN
911422237
Phone
2533051900
Business address
1301 A STREET, TACOMA, WA, 98402
Former names
COLUMBIA BANKING SYSTEM INC
Open-market buys, last 90 days
$0
in 0 filings
Open-market sales, last 90 days
$328,617
in 1 filing

Net −$328,617. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.

Pace of trading Bought Sold

Who's trading

90 days

  1. GARDNER STEVEN R −$329K Director sold 80% of stake

Reading 100 more Form 4s from the SEC; this list fills in as they're read.

Date Insider Transaction Shares Price Value Owned after
2025-09-02 MITCHELL M CHRISTIAN Director Grant or award +2,205 37,960
2025-08-31 GARDNER STEVEN R Director Grant or award +245,875 245,875
2025-08-31 GARDNER STEVEN R Director Grant or award +338,221 338,221
2025-08-31 STUDENMUND JAYNIE M Director Grant or award +15,653 15,653
2025-08-31 STUDENMUND JAYNIE M Director Grant or award +3,843 3,843
2025-08-31 MITCHELL M CHRISTIAN Director Grant or award +35,755 35,755
2025-07-29 MACHUCA LUIS Director Grant or award · Deferred Compensation Phantom Stock +668 $24.83 $17K 46,487
2025-07-22 Giem Judi EVP CHRO Grant or award · Restricted Stock Unit +7,179 $24.38 $175K 7,179
2025-07-22 Giem Judi EVP CHRO Grant or award · Performance Restricted Stock Unit +3,590 $24.38 $88K 3,590
2025-07-22 Giem Judi EVP CHRO Grant or award · Performance Restricted Stock Unit +3,590 $24.38 $88K 7,180
2025-06-02 MACHUCA LUIS Director Grant or award · Deferred Compensation Phantom Stock +708 $23.29 $16K 45,819
2025-05-15 POPE MARIA M Director Grant or award +3,382 47,569
2025-05-15 Finkelstein Mark A Director Grant or award +3,382 31,605
2025-05-15 Forrest Eric Director Grant or award +3,382 32,402
2025-05-15 Lund Randal Lee Director Grant or award +3,382 23,714
2025-05-15 MACHUCA LUIS Director Grant or award +3,382 26,004
2025-05-15 Numata S Mae Fujita Director Grant or award +3,382 37,113
2025-05-15 SCHULTZ JOHN F Director Grant or award +3,382 49,435
2025-05-15 SEATON ELIZABETH WHITEHEAD Director Grant or award +3,382 32,566

Page 8 of 8 · 159 trades