SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE

SECURITIES EXCHANGE ACT OF 1934

August 20, 2025

Commission File Number: 001-32827

MACRO BANK INC.

(Translation of registrant’s name intoEnglish)

Av. Eduardo Madero 1182

Buenos Aires C1106ACY

Tel: 54 11 5222 6500

(Address of registrant’s principal executiveoffices)

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

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

Indicate by check mark if the registrant is submitting the Form 6-Kin paper as permitted by Regulation S-T Rule 101(b)(7):

INDEX

Translation of a submission from Banco Macro tothe CNV dated on August 20, 2025.

Payment ofCash Dividend

Wehereby inform to the Shareholders of Banco Macro S.A. that, pursuant to (i) the resolutions adopted by the General and Special Shareholders’Meeting held on April 4^th 2025, (ii) Communique “A” 8214 authorizing the financial entities with authorizationof the Central Bank of the Republic of Argentina to distribute dividends in 10 equal and consecutive monthly instalments expressed inconstant currency, (iii) the authorization by the Superintendency of Financial and Exchange Entities of the Central Bank of the Republicof Argentina obtained last June 4^th, and (iv) the resolutions adopted by the Board of Directors at the meeting held on August20^th 2025, Banco Macro S.A. shall make available and pay to its shareholders instalment No. 3 of the cash dividend of AR $35,185,719,535.63, (i.e., AR $ 55.0281228003 per share representing 5,502.8122% of the capital stock of AR $639,413,408).

Availableas of: 08/28/2025

Recorddate: 08/27/2025

Asto the aggregate amount of dividends Banco Macro S.A. shall distribute, please be advised that such amount is subject to a 7% withholdingunder section 97 of the Income Tax Law as revised in 2019.

Suchcash dividend shall be made available as of the above stated date at Caja de Valores S.A. located in 25 de Mayo 362, Autonomous Cityof Buenos Aires, Mondays to Fridays from 10 AM to 3 PM.

Shareholdersholding American Depositary Receipts (ADRs) shall receive the relevant dividend under the applicable depositary agreement through TheBank of New York Mellon, as depositary agent of such certificates’ underlying Class B Shares as of the relevant date under therules applicable in the jurisdiction in which such ADRs of the Company are listed.

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, thereto duly authorized.

Date: August 20, 2025