STOCK TITAN

Columbia Banking director reports 32,931 shares

Newly reported Columbia Banking System director Simone Lagomarsino discloses indirect ownership of common stock through a family trust and an IRA.

(Moderate)
(Neutral)
Form Type
3

Rhea-AI Filing Summary

COLUMBIA BANKING SYSTEM, INC. (COLB) director Simone Lagomarsino filed an initial ownership report showing indirect holdings of the company’s Common Stock. The filing lists 32,931 shares held indirectly through a family trust and an additional 7 shares held indirectly through an IRA as of September 1, 2026.

Positive

  • None.

Negative

  • None.
Insider LAGOMARSINO SIMONE
Role Director
Type Security Shares Price Value
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 32,931 shares (Indirect, by family trust); Common Stock — 7 shares (Indirect, by IRA)
Indirect shares by family trust 32,931 shares Common Stock held indirectly by family trust following the reported holdings as of September 1, 2026
Indirect shares by IRA 7 shares Common Stock held indirectly by IRA following the reported holdings as of September 1, 2026
Number of holding entries 2 entries Two indirect Common Stock holding lines reported (family trust and IRA)
indirect financial
"The filing lists indirect holdings of Common Stock by family trust and by IRA"
family trust financial
"Total shares following transaction were held indirect by family trust"
IRA financial
"Total shares following transaction were held indirect by IRA"
An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

FAQ

What does the Form 3 filing report for COLB director Simone Lagomarsino?

It reports Simone Lagomarsino’s initial ownership in COLUMBIA BANKING SYSTEM, INC. common stock, consisting of indirect holdings through a family trust and an IRA as of September 1, 2026.

How many COLB shares are held through the family trust?

The filing shows 32,931 shares of COLUMBIA BANKING SYSTEM, INC. common stock held indirectly by Simone Lagomarsino by family trust as of September 1, 2026.

How many COLB shares are held through the IRA?

The Form 3 indicates that 7 shares of COLUMBIA BANKING SYSTEM, INC. common stock are held indirectly by Simone Lagomarsino by IRA as of September 1, 2026.

Does the Form 3 for COLB show any recent stock purchases or sales?

No. The entry is an initial ownership report and lists holding positions only, with no reported transaction code or share amounts acquired or disposed on September 1, 2026.

Are Simone Lagomarsino’s COLB holdings direct or indirect?

All reported positions are indirect. The filing states 32,931 shares held indirectly by a family trust and 7 shares held indirectly by an IRA.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Learn about SEC filing dates
SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
LAGOMARSINO SIMONE

(Last)(First)(Middle)
C/O COLUMBIA BANKING SYSTEM, INC.
1301 A STREET

(Street)
TACOMA WASHINGTON 98402

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
09/01/2026
3. Issuer Name and Ticker or Trading Symbol
COLUMBIA BANKING SYSTEM, INC. [ COLB ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock32,931Iby family trust
Common Stock7Iby IRA
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
/s/ Kumi Yamamoto Baruffi, Attorney-in-fact09/02/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)