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Livermore
Livermore
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Columbia Banking System, Inc.

COLB
Exchange
Nasdaq
Industry
State Commercial Banks
SEC CIK
0000887343

In the last 90 days, Columbia Banking System, Inc. insiders filed 1 open-market purchase and 0 sales; 555 institutions reported holding it in 13F filings for Q2 2026, worth $8.63B in total; no superinvestor holds it.

Holders of 5% or more of COLB

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Columbia Banking System, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of COLB
HolderLatest formStakeChangeFirst filedLatest filingFiling
Wellington Management Group LLP13G6.10%18.1M sharesNewFeb 10, 20261 filingFeb 10, 2026SEC
Vanguard Capital Management LLC13G5.24%15.5M sharesNewApr 29, 20261 filingApr 29, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

5 Schedule 13D and 13G filings on Columbia Banking System, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on COLB
Filed (ET)FilerFormStakeChangeEvent dateFiling
Apr 29, 20265:43 PM ETVanguard Capital Management LLC13G5.24%15.5M sharesNewMar 31, 2026SEC
Mar 26, 20265:42 PM ETVanguard Group Inc13G/A0.00%0 shares–Below 5%Mar 13, 2026SEC
Feb 10, 202611:19 AM ETWellington Management Group LLPand 3 others13G6.10%18.1M sharesNewDec 31, 2025SEC
May 13, 202510:40 AM ETState Street Corp13G4.80%10.1M shares−0.40 ppfrom 5.20%Below 5%Mar 31, 2025SEC
Feb 4, 20259:33 AM ETState Street Corp13G5.20%10.9M sharesNewDec 31, 2024SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Columbia Banking System, Inc. shares.

No Form 144 notices for Columbia Banking System, Inc. are on file.