[6-K] SOUTHEAST AIRPORT GROUP Current Report (Foreign Issuer)

Rhea-AI Filing Summary

Grupo Aeroportuario del Sureste (ASUR) reported that shareholders approved resolutions at a General Ordinary Shareholders’ Meeting held in Mexico City on January 26, 2026. The meeting appointed special delegates to appear before a notary public to legalize the minutes and carry out any actions needed to formalize and give effect to the approved resolutions.

ASUR is described as a leading international airport operator with concessions for 16 airports across the Americas, including nine in southeast Mexico such as Cancún Airport, six in northern Colombia including Medellín’s international airport, and a 60% interest in the operator of San Juan’s Luis Muñoz Marín International Airport. One ASUR ADS represents ten B-series shares listed in Mexico.

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 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of January 2026

GRUPO AEROPORTUARIO DEL SURESTE, S.A.B. de C.V.

(SOUTHEAST AIRPORT GROUP)

(Translation of Registrant’s Name Into English)

México

(Jurisdiction of incorporation or organization)

Bosque de Alisos No. 47A– 4th Floor

Bosques de las Lomas

05120 México, D.F.

(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 x Form 40-F ¨

(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 ¨ No x

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

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.

Grupo Aeroportuario del Sureste, S.A.B. de C.V.
By:	/s/ ADOLFO CASTRO RIVAS
	Adolfo Castro Rivas
	Chief Executive Officer

Date: January 26, 2026

Exhibit 99.1

Contacts: ASUR Lic. Adolfo Castro (52) 55 5284-0408 acastro@asur.com.mx		InspIR Group Susan Borinelli (646) 330-5907 susan@inspirgroup.com
ASUR Lic. David Barlow (52) 55-5284-0483 dbarlow@asur.com.mx

ASUR Announces Resolutions Approved at the
General Ordinary Shareholders’ Meeting held on January 26^th, 2026

MEXICO CITY, January 26^th, 2026 -- Grupo Aeroportuario del Sureste, S.A.B. de C.V. (NYSE: ASR; BMV: ASUR) (ASUR), a leading international airport group with operations in Mexico, the United States, and Colombia, today announced that shareholders approved the following resolutions and considered the following matters at the General Ordinary Shareholders' Meeting held in Mexico City on January 26^th, 2026:

General Ordinary Meeting

Summary of Resolutions

1. Approval for the Company to acquire all or part of the shares and/or airport operators, including Companhia de Participações em Concessões, either directly or through its subsidiaries and/or special purpose vehicles. Resolutions thereon.

2. Approval for the Company to, directly or indirectly, contract any type of debt, either through bank loans, securities issuances, or any other form of financing, and to enter into the contracts and agreements necessary and/or convenient to implement the foregoing. Resolutions thereon.

Special delegates of the Ordinary General Shareholders’ Meeting were appointed to appear before a notary public to legalize the minutes of the meeting and to undertake any other action necessary to formalize and give effect to the resolutions taken at this meeting.

About ASUR:

Grupo Aeroportuario del Sureste, S.A.B. de C.V. (ASUR) is a leading international airport operator with a portfolio of concessions to operate, maintain, and develop 16 airports across the Americas. The Company operates nine airports in southeast of Mexico, including Cancún Airport, the largest tourist gateway in Mexico, the Caribbean, and Latin America; as well as six airports in northern Colombia, including Medellin international airport (Rionegro), the second busiest in Colombia.

ASUR also holds a 60% interest in Aerostar Airport Holdings, LLC, operator of Luis Muñoz Marin International Airport in San Juan, the capital of Puerto Rico, the island’s primary international gateway. San Juan Airport was the first and remains the only major airport in the U.S. to have successfully completed a public–private partnership under the FAA Pilot Program. ASUR has recently expanded into airport commercial services through ASUR US, which partners with airports and airlines to deliver enhanced retail and passenger experiences. ASUR Airports operates at major U.S. hubs, including Los Angeles International, Chicago O’Hare, and John F. Kennedy International, and has a track record of outperforming U.S. commercial revenue benchmarks.

ASUR -

Headquartered in Mexico, ASUR is listed on both the Mexican Bolsa (BMV) under the symbol ASUR, and on the NYSE in the U.S., where it trades under the symbol ASR. One ADS represents ten (10) B-series shares. For further information, visit www.asur.com.mx

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