Southeast Airport Group sells two $900M note tranches

ASUR intends to apply net proceeds to two acquisition-related bridge facilities; remaining proceeds may be used for other liabilities and general corporate purposes.

Rhea-AI Filing Summary

SOUTHEAST AIRPORT GROUP (ASR), through subsidiary Aeropuerto de Cancún, completed the offering and sale of two senior-note tranches, each with U.S.$900,000,000.00 aggregate principal amount. One bears interest at 6.711% per annum and matures October 8, 2031; the other bears 7.491% per annum and matures October 8, 2036. The notes settled October 8, 2026, and are expected to be listed on the Singapore Exchange Securities Trading Limited.

ASUR intends to use net proceeds to pay, prepay or refinance in full the outstanding principal of two bridge facilities: Ps.6,390,000,000 connected with the acquisition of ASUR US Commercial Airports, LLC, and U.S.$1,299,000,000.00 connected with the acquisition of Companhia de Participações em Concessões. Remaining proceeds may be used for other financial liabilities and general corporate purposes. The notes received ratings of BBB from S&P Global Ratings and BBB+ from Fitch Ratings. They have not been and will not be registered under the U.S. Securities Act, and may not be publicly offered or distributed in Mexico.

Key Figures

Aggregate principal amount: U.S.$900,000,000.00 Interest rate: 6.711% per annum Aggregate principal amount: U.S.$900,000,000.00 +5 more

8 metrics

Aggregate principal amount U.S.$900,000,000.00 Senior notes maturing October 8, 2031

Interest rate 6.711% per annum Senior notes maturing October 8, 2031

Aggregate principal amount U.S.$900,000,000.00 Senior notes maturing October 8, 2036

Interest rate 7.491% per annum Senior notes maturing October 8, 2036

Bridge credit facility principal Ps.6,390,000,000 Facility connected with the acquisition of ASUR US Commercial Airports, LLC

Bridge credit facility principal U.S.$1,299,000,000.00 Facility connected with the acquisition of Companhia de Participações em Concessões

S&P Global Ratings rating BBB Rating received by the notes

Fitch Ratings rating BBB+ Rating received by the notes

Key Terms

senior notes, senior unsecured bridge credit facility, aggregate principal amount, Regulation S

4 terms

senior notes financial

"aggregate principal amount of senior notes"

Senior notes are a type of loan that a company borrows from investors, promising to pay it back with interest. They are called "senior" because in case the company faces financial trouble, these lenders are paid back before others. This makes senior notes safer for investors compared to other types of loans or bonds.

senior unsecured bridge credit facility financial

"outstanding principal amount of the Ps.6,390,000,000 senior unsecured bridge credit facility"

A short-term loan provided to a borrower to 'bridge' the period until permanent financing or a specific transaction closes; it is 'senior' because it ranks ahead of the company’s subordinated debt for repayment but 'unsecured' because it is not backed by specific collateral. Such facilities typically have a fixed, near-term maturity, higher interest rates and fees than longer-term loans, and rely on contractual covenants and the borrower’s general creditworthiness rather than pledged assets; in a liquidation they are paid after any secured creditors but before subordinated or junior creditors.

aggregate principal amount financial

"U.S.$900,000,000.00 aggregate principal amount"

The aggregate principal amount is the total amount of money borrowed through a bond or loan that the borrower promises to repay. It’s like the original price tag on a loan or bond, showing how much money is involved in the deal. This number matters because it indicates the size of the debt and helps investors understand the scale of the borrowing.

Regulation S regulatory

"in reliance on Regulation S under the Securities Act"

Regulation S is a set of rules that allows companies to sell securities (like shares or bonds) to investors outside the United States without having to follow all U.S. securities laws. It matters because it makes it easier for companies to raise money from international investors while still complying with U.S. regulations.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What are the terms of ASR's new senior notes?

Aeropuerto de Cancún completed the sale of two senior-note tranches, each with U.S.$900,000,000.00 aggregate principal amount. One bears interest at 6.711% per annum and matures October 8, 2031; the other bears 7.491% per annum and matures October 8, 2036.

How does ASUR intend to use the notes' proceeds?

ASUR intends to use net proceeds to pay, prepay or refinance in full the outstanding principal of a Ps.6,390,000,000 bridge facility connected with the acquisition of ASUR US Commercial Airports, LLC, and a U.S.$1,299,000,000.00 bridge facility connected with the acquisition of Companhia de Participações em Concessões. Remaining proceeds may be used for other financial liabilities and general corporate purposes.

What ratings did ASR's senior notes receive?

The notes received ratings of BBB from S&P Global Ratings and BBB+ from Fitch Ratings.

When did ASR's notes settle and where are they expected to list?

The notes settled October 8, 2026, and are expected to be listed on the Singapore Exchange Securities Trading Limited.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/08/2026 - 04:45 PM Accepted by SEC EDGAR 10/08/2026 - 04:44 PM Learn about SEC filing dates

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 October 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: October 8, 2026

Exhibit 99.1

Contacts:   ASUR Lic. Adolfo Castro +52-55-5284-0408 acastro@asur.com.mx   Lic. David Barlow +52-55-5284-0483 dbarlow@asur.com.mx       InspIR Group Susan Borinelli +1-646-330-5907 susan@inspirgroup.com

ASUR ANNOUNCES THE SUCCESSFUL PLACEMENT, BY ITS SUBSIDIARY AEROPUERTO DE CANCÚN, S.A. DE C.V., OF 6.711% SENIOR NOTES DUE 2031 AND 7.491% SENIOR NOTES DUE 2036

Mexico City, October 8, 2026 - Grupo Aeroportuario del Sureste, S.A.B. de C.V. (BMV: ASUR; NYSE: ASR) (“ASUR” or the “Company”) ASUR, a leading airport group in the Americas with operations in Mexico, Brazil, the U.S., Colombia and the Caribbean, hereby informs the investing public that its subsidiary Aeropuerto de Cancún, S.A. de C.V. (“Aeropuerto de Cancún”) completed the offering and sale of (i) U.S.$900,000,000.00 aggregate principal amount of senior notes, bearing interest at 6.711% per annum and maturing on October 8, 2031, and (ii) U.S.$900,000,000.00 aggregate principal amount of senior notes, bearing interest at 7.491% per annum and maturing on October 8, 2036 (together, the “Notes”).

The Notes received the following ratings: BBB from S&P Global Ratings and BBB+ from Fitch Ratings.

ASUR intends to use the net proceeds from the Notes to: (i) pay, prepay or refinance in full the outstanding principal amount of the Ps.6,390,000,000 senior unsecured bridge credit facility dated December 5, 2025, entered into among Aeropuerto de Cancún and ASUR US Commercial Airports, LLC, as borrowers, and the Company, as guarantor, in connection with the acquisition of ASUR US Commercial Airports, LLC; and (ii) pay, prepay or refinance in full the outstanding principal amount of the U.S.$1,299,000,000.00 senior unsecured bridge credit facility dated August 14, 2026, entered into among Aeropuerto de Cancún, as borrower, and the Company, as guarantor, in connection with the acquisition of Companhia de Participações em Concessões. The remaining proceeds may be used to pay, prepay or refinance other financial liabilities and for general corporate purposes.

The Notes settled on October 8, 2026 and are expected to be listed on the Singapore Exchange Securities Trading Limited (the “SGX-ST”).

The Notes have not been and will not be registered under the U.S. Securities Act of 1933, as amended (the “Securities Act”), or under the securities laws of any other jurisdiction. The Notes were offered pursuant to Rule 144A under the Securities Act (“Rule 144A”) and outside the United States, to persons other than U.S. persons in reliance on Regulation S under the Securities Act (“Regulation S”).

THIS ANNOUNCEMENT DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY SECURITIES IN ANY COUNTRY OR JURISDICTION, INCLUDING MEXICO AND THE UNITED STATES. THE NOTES MAY NOT BE OFFERED OR SOLD PUBLICLY IN MEXICO WITHOUT THE PRIOR AUTHORIZATION OF THE MEXICAN NATIONAL BANKING AND SECURITIES COMMISSION (COMISIÓN NACIONAL BANCARIA Y DE VALORES) (THE “CNBV”) IN ACCORDANCE WITH THE MEXICAN SECURITIES MARKET LAW (LEY DEL MERCADO DE VALORES) AND OTHER APPLICABLE PROVISIONS, AND WITHOUT THE CORRESPONDING REGISTRATION OF THE NOTES WITH THE MEXICAN NATIONAL SECURITIES REGISTRY (REGISTRO NACIONAL DE VALORES) MAINTAINED BY THE CNBV, EXCEPT THAT THE NOTES MAY BE OFFERED OR SOLD TO INSTITUTIONAL OR QUALIFIED INVESTORS IN MEXICO SOLELY PURSUANT TO THE PRIVATE PLACEMENT EXEMPTION SET FORTH IN ARTICLE 8 OF THE MEXICAN SECURITIES MARKET LAW. THE OFFERING OF THE NOTES HAS NOT BEEN AND WILL NOT BE REVIEWED OR AUTHORIZED BY THE CNBV. THE NOTES HAVE NOT BEEN AND MAY NOT BE PUBLICLY OFFERED OR DISTRIBUTED IN MEXICO. THE ACQUISITION OF THE NOTES BY ANY INVESTOR RESIDENT IN MEXICO SHALL BE MADE AT SUCH INVESTOR'S OWN RISK AND RESPONSIBILITY.

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About ASUR

Grupo Aeroportuario del Sureste, S.A.B. de C.V. (ASUR) is a leading international airport group with a diversified portfolio of 36 airport concessions across the Americas and a commercial services platform in the U.S. ASUR operates nine airports in southeastern Mexico, including Cancún International Airport, the largest tourist gateway in Mexico, the Caribbean, and Latin America; and six airports in northern Colombia, including Medellin international airport (Rionegro), the second busiest in Colombia. ASUR also holds a controlling 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. The Company has recently acquired 100% of CPC Aeroporto's stake to operate 17 airports in Brazil, Latin America’s largest aviation market by passenger traffic, as well as one airport each in Costa Rica, Curaçao, and Ecuador. ASUR also operates a commercial services platform in the U.S. through ASUR Airports, 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. 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.

- END -

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Filing Exhibits & Attachments

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• EX-99.1 EXHIBIT 99.1 11.5 KB