Wellington Management Group LLP and affiliated entities have filed a Schedule 13G reporting a significant passive stake in Columbia Banking System, Inc. (COLB). The Wellington group reports beneficial ownership of 18,106,228 shares of Columbia’s common stock, representing approximately 6.05–6.1% of the outstanding class.
The shares are held of record by clients of multiple Wellington investment adviser subsidiaries, which have shared voting and dispositive power, while Wellington entities themselves report no sole voting or dispositive power. The filing states the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of Columbia Banking System. No individual client is reported to hold more than five percent of the class.
Positive
None.
Negative
None.
Insights
Wellington discloses a passive 6% institutional stake in Columbia Banking System.
The filing shows Wellington Management Group LLP and related entities collectively beneficially own 18,106,228 Columbia Banking System common shares, or about 6.05–6.1% of the class. Voting and dispositive authority is reported as shared through Wellington’s investment adviser subsidiaries, with no sole authority.
The position is certified as being held in the ordinary course of business and not for the purpose of changing or influencing control. That language characterizes the stake as passive, which typically means no activist intentions are signaled in this disclosure. The shares are owned by multiple underlying clients, and no single client is stated to have more than five percent of the class.
FAQ
What stake does Wellington report in Columbia Banking System (COLB)?
Wellington and related entities report beneficial ownership of 18,106,228 Columbia Banking System common shares, representing about 6.05–6.1% of the outstanding class. These shares are held for clients of Wellington’s investment advisers, with shared voting and dispositive power reported.
Is Wellington’s Columbia Banking System (COLB) position passive or activist?
The Schedule 13G states the Columbia Banking System shares were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control. This language characterizes the Wellington group’s stake as a passive institutional investment, not an activist position.
Which Wellington entities are reporting ownership in Columbia Banking System (COLB)?
The reporting persons are Wellington Management Group LLP, Wellington Group Holdings LLP, Wellington Investment Advisors Holdings LLP, and Wellington Management Company LLP. These entities sit atop or include the investment advisers whose clients hold the Columbia Banking System common stock position.
How much voting power does Wellington have over its Columbia Banking (COLB) shares?
Wellington entities report no sole voting power over Columbia Banking System shares, but significant shared voting power through their adviser subsidiaries. The cover pages show shared voting authority over more than 16.5 million shares and shared dispositive authority over more than 17.3 million shares.
Do any Wellington clients individually own over 5% of Columbia Banking System (COLB)?
The filing states that while Wellington’s clients own the Columbia Banking System shares of record, no single client is known to hold more than five percent of the common stock class. The aggregate 6% stake reflects holdings spread across multiple advisory clients.
When did Wellington’s ownership level in Columbia Banking System (COLB) trigger this 13G filing?
The Schedule 13G lists 12/31/2025 as the date of the event requiring the filing. That date reflects when Wellington’s beneficial ownership in Columbia Banking System common stock reached a level necessitating this institutional ownership disclosure.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Columbia Banking System, Inc.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
197236102
(CUSIP Number)
12/31/2025
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
SCHEDULE 13G
CUSIP No.
197236102
1
Names of Reporting Persons
Wellington Management Group LLP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
MASSACHUSETTS
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
16,552,540.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
18,106,228.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
18,106,228.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.1 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
CUSIP No.
197236102
1
Names of Reporting Persons
Wellington Group Holdings LLP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
16,552,540.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
18,106,228.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
18,106,228.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.1 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
CUSIP No.
197236102
1
Names of Reporting Persons
Wellington Investment Advisors Holdings LLP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
16,552,540.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
18,106,228.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
18,106,228.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.1 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
CUSIP No.
197236102
1
Names of Reporting Persons
Wellington Management Company LLP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
16,426,942.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
17,346,554.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
18,106,228.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.8 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Columbia Banking System, Inc.
(b)
Address of issuer's principal executive offices:
1301 A Street, Tacoma WA
Item 2.
(a)
Name of person filing:
Wellington Management Group LLP
Wellington Group Holdings LLP
Wellington Investment Advisors Holdings LLP
Wellington Management Company LLP
(b)
Address or principal business office or, if none, residence:
c/o Wellington Management Company LLP, 280 Congress Street, Boston MA 02210
(c)
Citizenship:
Wellington Management Group LLP - Massachusetts
Wellington Group Holdings LLP - Delaware
Wellington Investment Advisors Holdings LLP - Delaware
Wellington Management Company LLP - Delaware
(d)
Title of class of securities:
Common Stock
(e)
CUSIP No.:
197236102
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
See the responses to Item 9 on the attached cover pages.
(b)
Percent of class:
6.05 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
0
(ii) Shared power to vote or to direct the vote:
See the responses to Item 6 on the attached cover pages.
(iii) Sole power to dispose or to direct the disposition of:
0
(iv) Shared power to dispose or to direct the disposition of:
See the responses to Item 8 on the attached cover pages.
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
The securities as to which this Schedule is filed are owned of record by clients of one or more investment advisers identified in Item 7 directly or indirectly owned by Wellington Management Group LLP. Those clients have the right to receive, or the power to direct the receipt of, dividends from, or the proceeds from the sale of, such securities. No such client is known to have such right or power with respect to more than five percent of this class of securities, except as follows:
Not Applicable.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
Pursuant to the instructions in Item 7 of Schedule 13G, the following lists the identity and Item 3 classification of each relevant entity that beneficially owns shares of the security class being reported on this Schedule 13G.
Wellington Group Holdings LLP - HC
Wellington Investment Advisors LLP - HC
Wellington Management Global Holdings, Ltd. - HC
One or more of the following investment advisers (the "Wellington Investment Advisers"):
Wellington Management Company LLP - IA
Wellington Management Canada LLC - IA
Wellington Management Singapore Pte Ltd - IA
Wellington Management Hong Kong Ltd - IA
Wellington Management International Ltd - IA
Wellington Management Japan Pte Ltd - IA
Wellington Management Australia Pty Ltd - IA
The securities as to which this Schedule is filed by Wellington Management Group LLP, as parent holding company of certain holding companies and the Wellington Investment Advisers, are owned of record by clients of the Wellington Investment Advisers. Wellington Investment Advisors Holdings LLP controls directly, or indirectly through Wellington Management Global Holdings, Ltd., the Wellington Investment Advisers. Wellington Investment Advisors Holdings LLP is owned by Wellington Group Holdings LLP. Wellington Group Holdings LLP is owned by Wellington Management Group LLP.
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
