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 July, 2020

Comission 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 þ                    Form 40-F  ¨

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 þ

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

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.

Exhibit 99.1

BANCOLOMBIA ANNOUNCES CALL TO AN EXTRAORDINARY SHAREHOLDERS´ MEETING

Medellin, Colombia, July 14, 2020

The Board of Directors in today´s session instructed the President, to call the holders of common shares to an Extraordinary Shareholders' Meeting to be held on Friday, July 31^st, 2020, at 2:00 p.m. (GMT-5)

The proposed agenda for the meeting is as follows:

1. Verification of Quorum.

2. Reading and approval of the agenda.

3. Election of commission for vote count and approval and execution of the minutes.

4. Presentation, consideration and approval of proposal to transfer existing resources in the Occasional Reserve for the Equity Reinforcement and Future Growth with a value of COP $ 3.672.418.689.916,45, to the Bank's Legal Reserve.

The notice, forms of power of attorney that the shareholders can use to be represented at the meeting, as well as the information that explains the proposal corresponding to item 4 of the agenda, will be available on the Bank's website: www.grupobancolombia.com

Notice:

As it is stated in the Bylaws of the Company and in the law, the notice to the Extraordinary Shareholders Meeting will be published tomorrow, July 15, in the newspapers of La Republica and El Colombiano.

Virtual Shareholders Meeting:

In accordance with the special measures established by the Government due to the health emergency declared as a result of Covid-19, the shareholders meeting will be virtual, in accordance to the article 19 of the law 222 of 1995 and the decree 398 of 2020 and the access will be available on the Bank's website www.grupobancolombia.com

The participation in the meeting, the voting exercise of the shareholders and the registration enabled since today, will be done through the website https://www.grupobancolombia.com/wps/portal/acerca-de