UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF

THE SECURITIES EXCHANGE ACT OF 1934

For the month of May, 2025

Commission File Number 001-32535

Bancolombia S.A.

(Translation of registrant’s name into English)

Cra. 48 # 26-85

Medellín, Colombia

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F þo Form 40-F o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):___

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(2):___

Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes o No þo

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-___________ .


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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	BANCOLOMBIA S.A.(Registrant)
Date May 23, 2025	By:	/s/ MAURICIO BOTERO WOLFF.
Date May 27, 2025	By:	/s/ MAURICIO BOTERO WOLFF.
	Name:	Mauricio Botero Wolff
	Title:	Vice President of Strategy and Finance

May 2327, 2025

Medellin, Colombia

~~EXTRAORDINARY~~BANCOLOMBIA ~~GENERAL~~S.A. ~~SHAREHOLDERS’~~ANNOUNCES ~~MEETING~~MEASURES ~~NOTICE~~ TO GUARANTEE FAIR TREATMENT OF ITS SHAREHOLDERS

The ~~Presidency~~following ofare ~~Bancolombia~~prohibited ~~S.A~~activities ~~hereby~~established ~~calls~~by the ~~shareholders~~Board toof anDirectors ~~Extraordinary~~and ~~General~~included ~~Shareholders’~~in ~~Meeting~~the Good Governance Code, ~~which~~directed ~~will~~at ~~take~~legal ~~place~~representatives, inmanagement ~~person,~~and onother ~~May~~employees ~~29,~~of ~~2025~~Bancolombia S.A. (“Bancolombia”), as well as at ~~7:00~~legal amrepresentatives, atmanagement ~~the~~and ~~offices~~other employees of ~~the~~Fiduciaria ~~management~~Bancolombia ofS.A., the ~~Bank~~entity responsible for administering Bancolombia's shares, ~~located~~aimed at ensuring the ~~following~~equitable ~~address:~~treatment ~~Carrera~~of 48all ~~Número~~of ~~26-85~~Bancolombia’s shareholders, ~~Torre~~and ~~Sur,~~which ~~Piso~~will ~~11,~~apply into the ~~city~~Extraordinary ofGeneral ~~Medellín~~Shareholders' Meeting to be held on May 29, 2025.

~~The~~•Encourage, ~~proposed~~promote ~~agenda~~or suggest that shareholders grant blank-check powers of attorney, where the name of the representative for the ~~meeting~~shareholders' meetings is asnot ~~follows:~~clearly stated.

~~1.Verification~~•Receive powers of ~~quorum~~attorney from the shareholders where the name of the respective representative for the shareholders’ meeting is not clearly stated.

2•Accept powers of attorney conferred by the shareholders as valid if all legal requirements have not been fulfilled.~~Reading~~ Powers of-attorney must be granted in writing, indicating the ~~agenda~~name of the representative, the person who can replace the representative, if applicable, and the date of the meeting. Legal entities that grant powers-of-attorney must include a recent certificate of good standing that proves their existence and representation in accordance with the law.

~~3.Election~~•Suggest ofor ~~commission~~determine ~~for~~the ~~vote~~names ~~count,~~of ~~approval,~~those ~~and~~who ~~execution~~will act as representatives of the ~~minutes~~shareholders at the meetings.

~~4.Proposal~~•Recommend that shareholders vote for a certain list. This does not restrict the ~~compensation~~Board of Directors or the ~~members~~CEO, ofin the ~~Boards~~exercise of ~~Directors~~their ofduties, ~~Bancolombia~~from ~~S.A.~~presenting ~~and~~proposals ~~Grupo~~for ~~Cibest~~the Sconsideration of the shareholders’ meeting.A.

5.General authorization for entering into recurring transactions and transactions in the ordinary course of business between Bancolombia S.A. and Grupo Cibest S.A.

Shareholders may be represented at the Meeting by granting powers of attorney in writing to authorized representatives, in accordance with Colombian law. Powers of attorney may not be granted to employees of the Bank nor to any other person directly or indirectly related to the management of Bancolombia.

Information about the proposals to be presented for the General Shareholders’ Meeting consideration will be available on the Bank’s website www.grupobancolombia.com, in accordance with the provisions of our Good Governance Code.

We invite our shareholders to visit the website www.grupobancolombia.com to stay permanently informed about matters related to the General Shareholders’ Meeting.


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~~Management~~•Coordinate ofor ~~Bancolombia~~enter ~~confirms~~into ~~that~~an ~~all~~agreement ~~required~~with ~~processes~~any ~~and~~shareholder ~~authorizations~~or ~~required~~with any representative of shareholders to ~~carry~~vote ~~out~~in ~~the~~favor ~~Extraordinary~~or ~~General~~against ~~Shareholder’s~~any ~~Meeting~~proposal ~~notice~~that ~~have~~is ~~been~~presented ~~performed~~in orthe ~~obtained~~shareholders’ meeting.

The activities described above will also be prohibited when they are carried out through a legal representative, agent or intermediary.

Pursuant to these measures, the Board of Directors instructed that, to ensure a fair treatment of Bancolombia’s shareholders, management will need to implement the following procedures:

◦To encourage the delegation of powers of attorney in compliance with legal requirements in the General Shareholders’ Meeting, Bancolombia will make available on its website, templates of these legal documents that can be downloaded and completed by any shareholder.

◦Shareholders will have full discretion to appoint their proxy holders.

◦Management will not suggest or coordinate, with any of the shareholders, to vote in favor or against any proposal that is presented at the General Shareholders’ Meeting.

◦Bancolombia will make a team available to the General Shareholders’ Meeting to confirm compliance of the powers of attorneys conferred by the shareholders with legal requirements and that the proxy holders are not included in the Bank’s database of employees as of May 28, 2025.

Management and employees, while in the exercise of their duties, may not exercise their powers to represent shares other than their own in shareholders’ meetings, nor substitute the powers granted to them. This prohibition does not apply to legal representation. Management and employees may also not vote, even with their own shares, on the matters related to approving end of the year or liquidation balance sheets and accounts.

The Board of Directors appointed the following employees as responsible for implementing and verifying compliance with the control procedures:

BANCOLOMBIA

Legal Vice President and General Secretary

Legal Director of Company and Corporate Affairs

FIDUCIARIA BANCOLOMBIA

Trust Business Administration Manager

Head of Fiduciary Business Administration Section Medellín

Fiduciary Business Administration Section Analysts Medellín

These employees must check that the powers-of-attorney granted by the shareholders comply with the requirements of article 184 of the Code of Commerce and with the guidelines of the Board of Directors. Powers-of-attorney that are not in compliance with the provisions herein will not be accepted.

These measures are published on the website of Bancolombia.


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Contacts


Mauricio Botero Wolff			Catalina Tobón Rivera
Financial VP			IR Director
Tel.: (57 604) 4040858			Tel.: (57 601) 4885950
IR@bancolombia.com.co			IR@bancolombia.com.co

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