Official Letter Modifying the Authorization Terms for the Organization and Operation of Openbank Mexico, S.A., Multiple Banking Institution, Santander Mexico Financial Group

DOF: 02/09/2026

OFFICIAL LETTER modifying the terms of the authorization for the organization and operation of Openbank Mexico, S.A.

With a seal at the margin bearing the National Coat of Arms, which reads: United Mexican States.- Treasury.- Ministry of

Treasury and Public Credit.- National Banking and Securities Commission.- Vice Presidency of Regulation.-

General Directorate of Authorizations to the Financial System.- Vice Presidency of Supervision of Groups and

Financial Intermediaries A.- General Directorate of Supervision of Groups and Financial Intermediaries A.-

Official Letter No.: 312-1/709252/2026.- File: CNBV.3S.1.312 (16046).

SUBJECT: THE TERMS OF THE AUTHORIZATION FOR THE ORGANIZATION AND

OPERATION OF THAT ENTITY ARE MODIFIED.

OPENBANK MEXICO, S.A.,

MULTIPLE BANKING INSTITUTION,

SANTANDER MEXICO FINANCIAL GROUP

Av. Prolongación Paseo de la Reforma No. 490, Floor 5,

Santa Fe Peña Blanca Neighborhood, Álvaro Obregón Municipality,

C.P. 01376, Mexico City.

ATTN.:

MTRO. JUAN JOSÉ GALNARES MENDIRICHAGA

General Director

With official letter 312-3/9479/2025 dated May 27, 2025, this Commission approved the reform to the first

paragraph of Article Sixth of the bylaws of Openbank Mexico, S.A., Multiple Banking Institution, Santander Mexico Financial Group (Openbank), due to the increase in its social capital

in the amount of $900,000,000.00, to go from $2,908,420,220.00 to $3,808,420,220.00, in terms of the

unanimous resolutions adopted outside the extraordinary general shareholders' meeting adopted on August 14

2024.

With official letter 312-3/9799/2025 dated October 13, 2025, this Commission approved the reform to the first

paragraph of Article Sixth of the bylaws of Openbank Mexico, S.A., Multiple Banking Institution, Santander Mexico Financial Group (Openbank), due to the increase in its social capital

in the amount of $1,200,000,000.00, to go from $3,808,420,220.00 to $5,008,420,220.00, in terms of the

unanimous resolutions adopted outside the extraordinary general shareholders' meeting adopted on October 14

2025.

Through documents submitted to this Commission on June 13 and December 4, 2025, via the

electronic mail VPSupervisiónA@cnbv.gob.mx, and in compliance with the requirements contained in the

official letters 312-3/9479/2025 and 312-3/9799/2025, Openbank sent certified copies of the public deeds

336,644 and 342,645 dated October 30, 2024 and November 6, 2025, granted before the notary public

Licentiate Claudio Juan Ramón Hernández de Rubín, public notary number 6 of Mexico City

and

registered in the Public Registry of Property and Commerce of this same city, the first of them on June 6

2025 and the second on December 1, 2025, both under the commercial folio number N-2021025303

in which the statutory modifications in question were formalized.

For the above reason, based on Article 8, last paragraph of the Credit Institutions Law, this

Commission deems it appropriate to modify the Fifth Base of the "Authorization for the organization and operation of a

multiple banking institution subsidiary to be named Openbank Mexico, S.A., Multiple Banking Institution, Group

Financial Santander Mexico", contained in official letter P225/2023 dated July 12, 2023, issued by this

Commission, published in the Official Gazette of the Federation on July 26, 2023, last modified

by official letter 312-3/9142/2025 issued by this Commission on February 10, 2025 and published in the same

Gazette on March 7 of that year, to read as follows:

" ...

FIFTH.-

The amount of its paid-in social capital shall be $5,008,420,220.00 (five million eight

hundred forty-two thousand two hundred twenty pesos 00/100 M.N.).

... "

Likewise, based on Articles 8, last paragraph and 97 of the Credit Institutions Law and 19

of the National Banking and Securities Commission Law, Openbank is required to inform this

authority of the date of publication of the text of this official letter, in the Official Gazette of the Federation and in two

newspapers of wide circulation in its social domicile, within a period of fifteen business days counted from

the date of publication. The foregoing, on the understanding that said publications must be processed within

the fifteen business days following the date of receipt of this official letter.

This official letter is issued based on Articles 16, penultimate paragraph of the Law of the

National Banking and Securities Commission; and 14, 19, fraction X, 21, fractions I, subsection c), II and III and last

paragraph, 44, fractions I and IV and 64 of the Internal Regulations of the National Banking and Securities Commission.

Respectfully,

Mexico City, August 20, 2026. - General Director of Authorizations

for the Financial System,

Lic. Aurora de la Paz

Torres Arroyo.- Signature.- General Director of Supervision of

Groups and Financial Intermediaries A, Mtra. Cynthia Llamas Campos.- Signature.

(R.- 579884)

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