Southeast Airport Group adds 20 airports after Motiva deal

Q: How did ASR (Grupo Aeroportuario del Sureste) total passenger traffic perform in August 2026?

ASR reported 5.9 million passengers in August 2026, a 2.1% decrease versus August 2025. Domestic traffic grew 2.3%, but international traffic fell 10.7%, based on comparisons between August 1–31, 2026 and August 1–31, 2025.

Q: What were ASR’s August 2026 traffic trends by country for symbol ASR?

In August 2026, passenger traffic increased 4.0% in Colombia and declined 4.0% in Mexico and 5.1% in Puerto Rico versus August 2025. Colombia’s domestic traffic rose 5.8%, while Mexico’s international traffic decreased 13.6%.

Q: How is ASR’s year-to-date 2026 passenger traffic compared with 2025?

Year to date through August 2026, ASR handled 48,495,004 passengers, a 0.8% decline versus 48,873,301 in 2025. Domestic traffic increased 1.2%, while international traffic decreased 4.0% over the same period.

Q: What acquisition did ASR complete on September 1, 2026?

On September 1, 2026, ASR closed the acquisition of Motiva Airports, adding 17 airports in Brazil and one airport each in Costa Rica, Curaçao, and Ecuador. These airports will be included starting with the September 2026 passenger traffic report.

Q: How did Mexico’s domestic and international traffic evolve for ASR in August 2026?

In Mexico, August 2026 domestic traffic rose 4.1% year-on-year to 1,864,893 passengers, while international traffic decreased 13.6% to 1,299,923 passengers. Total Mexico traffic declined 4.0% to 3,164,816 passengers.

Q: What are the key traffic figures for ASR’s San Juan, Puerto Rico airport in August 2026?

At San Juan Airport, total August 2026 traffic was 1,126,633 passengers, down 5.1% from 2025. Domestic traffic declined 4.9% to 973,038 passengers, and international traffic fell 5.9% to 153,595 passengers.

Q: How many airport concessions does ASR operate after the Motiva acquisition?

ASR states it now holds a diversified portfolio of 36 airport concessions across the Americas, including airports in Mexico, Brazil, the U.S., Colombia, Puerto Rico, Ecuador, Costa Rica, and Curaçao.

ASR’s August 2026 traffic declined 2.1% overall, while it closed the Motiva Airports acquisition, adding 20 airports across Brazil and other Latin American markets.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

6-K

Rhea-AI Filing Summary

ASR (Grupo Aeroportuario del Sureste) reports that total passenger traffic for August 2026 was 5.9 million, a 2.1% decline versus August 2025. Traffic decreased 4.0% in Mexico and 5.1% in Puerto Rico, while Colombia grew 4.0% year-on-year.

Domestic traffic across its network rose 2.3% in August, but international traffic fell 10.7%, with Mexico’s international segment down 13.6% and Puerto Rico’s down 5.9%. Year to date through August 2026, total traffic was 48.5 million, a slight 0.8% decline from the prior year, with domestic up 1.2% and international down 4.0%.

On September 1, 2026, ASR closed the acquisition of Motiva Airports, adding 17 airports in Brazil and one airport each in Costa Rica, Curaçao, and Ecuador. Beginning with the September 2026 report, monthly passenger traffic will include these additional airports, expanding ASR’s reported network to 36 airport concessions across the Americas.

Positive

Closed Motiva Airports acquisition, adding 17 airports in Brazil plus one each in Costa Rica, Curaçao, and Ecuador, expanding ASR’s portfolio to 36 airport concessions across the Americas.
Colombia continues to be a growth driver, with August 2026 traffic up 4.0% year-on-year and year-to-date traffic up 6.6%, supported by 5.8% domestic and 3.2% international growth.

Negative

Total network traffic in August 2026 declined 2.1% year-on-year to 5.9 million passengers, with international traffic down 10.7% and total year-to-date traffic down 0.8%.
Mexico and Puerto Rico showed weakness in August 2026, with Mexico’s total traffic down 4.0% (international down 13.6%) and San Juan, Puerto Rico down 5.1%, continuing year-to-date declines in both markets.

Key Figures

Total passengers August 2026: 5,897,085 passengers Mexico total passengers August 2026: 3,164,816 passengers Puerto Rico total passengers August 2026: 1,126,633 passengers +5 more

8 metrics

Total passengers August 2026 5,897,085 passengers Total traffic across Mexico, Puerto Rico, and Colombia in August 2026, down 2.1% year-on-year

Mexico total passengers August 2026 3,164,816 passengers Mexico traffic in August 2026, down 4.0% versus August 2025

Puerto Rico total passengers August 2026 1,126,633 passengers San Juan (LMM) traffic in August 2026, down 5.1% year-on-year

Colombia total passengers August 2026 1,605,636 passengers Colombia traffic in August 2026, up 4.0% versus August 2025

Year-to-date total passengers 2026 48,495,004 passengers Total network traffic January–August 2026, down 0.8% from 2025

International traffic August 2026 1,831,251 passengers Total international passengers in August 2026, down 10.7% year-on-year

Motiva Airports acquired 20 airports 17 in Brazil, 1 in Costa Rica, 1 in Curaçao, and 1 in Ecuador, acquired September 1, 2026

Total airport concessions 36 airport concessions ASR’s diversified portfolio across the Americas after recent expansions

Key Terms

domestic traffic, international traffic, public–private partnership, airport concession, +2 more

6 terms

domestic traffic financial

"In Colombia, domestic traffic increased 5.8% and international decreased 1.2%."

Domestic traffic is the flow of customers, users, shipments or activity a business sees inside its home country — for example store visits, website visitors, deliveries or passengers within national borders. Investors watch it because it shows how well a company is serving and growing its local market, reveals dependence on one economy, and affects revenue, costs and risk exposure; think of it like foot traffic through a mall that drives most of a store’s sales.

international traffic financial

"Mexico saw domestic traffic growth of 4.1% and a decrease of 13.6% in international traffic"

International traffic means people, data, shipments or transactions that cross national borders to use a product, service or platform—for example website visits, phone calls, flights or packaged goods moving between countries. Investors care because the amount and growth of international traffic show how widely a business reaches foreign customers, expose it to currency and regulatory risks, and signal opportunities for revenue expansion much like a store gaining shoppers from new neighborhoods.

public–private partnership regulatory

"San Juan Airport was the first and remains the only major airport in the U.S. to have successfully completed a public–private partnership"

A public–private partnership is a formal agreement where a government agency and a private company share responsibility for delivering, funding, operating, or maintaining a public project or service—such as roads, hospitals, or utilities—with risks, payments and duties split between them. It matters to investors because these deals create long-term contracts and revenue streams tied to government objectives and performance, while also exposing returns to political, regulatory and operational risks—like a private firm jointly running a public asset under a multi-year lease.

airport concession financial

"a diversified portfolio of 36 airport concessions across the Americas"

ADS financial

"One ADS represents ten (10) B-series shares."

Ads are paid promotional messages a company places across media — online, on TV, in print, or on social platforms — to attract customers, explain products, or shape public perception. For investors, ads matter because they drive sales growth, affect how much a company must spend to win customers, and influence brand strength and long-term value. Ads can also create regulatory or reputational risk if claims are misleading, which can affect profits and stock price.

year to date financial

"Year to date 2025 2026 Mexico 27,875,680 27,087,720 (2.8)"

FAQ

How did ASR (Grupo Aeroportuario del Sureste) total passenger traffic perform in August 2026?

ASR reported 5.9 million passengers in August 2026, a 2.1% decrease versus August 2025. Domestic traffic grew 2.3%, but international traffic fell 10.7%, based on comparisons between August 1–31, 2026 and August 1–31, 2025.

What were ASR’s August 2026 traffic trends by country for symbol ASR?

In August 2026, passenger traffic increased 4.0% in Colombia and declined 4.0% in Mexico and 5.1% in Puerto Rico versus August 2025. Colombia’s domestic traffic rose 5.8%, while Mexico’s international traffic decreased 13.6%.

How is ASR’s year-to-date 2026 passenger traffic compared with 2025?

Year to date through August 2026, ASR handled 48,495,004 passengers, a 0.8% decline versus 48,873,301 in 2025. Domestic traffic increased 1.2%, while international traffic decreased 4.0% over the same period.

What acquisition did ASR complete on September 1, 2026?

On September 1, 2026, ASR closed the acquisition of Motiva Airports, adding 17 airports in Brazil and one airport each in Costa Rica, Curaçao, and Ecuador. These airports will be included starting with the September 2026 passenger traffic report.

How did Mexico’s domestic and international traffic evolve for ASR in August 2026?

In Mexico, August 2026 domestic traffic rose 4.1% year-on-year to 1,864,893 passengers, while international traffic decreased 13.6% to 1,299,923 passengers. Total Mexico traffic declined 4.0% to 3,164,816 passengers.

What are the key traffic figures for ASR’s San Juan, Puerto Rico airport in August 2026?

At San Juan Airport, total August 2026 traffic was 1,126,633 passengers, down 5.1% from 2025. Domestic traffic declined 4.9% to 973,038 passengers, and international traffic fell 5.9% to 153,595 passengers.

How many airport concessions does ASR operate after the Motiva acquisition?

ASR states it now holds a diversified portfolio of 36 airport concessions across the Americas, including airports in Mexico, Brazil, the U.S., Colombia, Puerto Rico, Ecuador, Costa Rica, and Curaçao.

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

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Available on EDGAR 09/08/2026 - 04:41 PM Accepted by SEC EDGAR 09/08/2026 - 04:41 PM

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 September 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: September 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 Total Passenger Traffic for August 2026

Passenger traffic increased year-on-year by 4.0% in Colombia and decreased by 4.0% in Mexico and 5.1% Puerto Rico

Mexico City, September 8, 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, Brazil, the U.S., Colombia and the Caribbean, today announced that total passenger traffic for August 2026 reached 5.9 million passengers, a 2.1% decrease compared to August 2025.

Passenger traffic showed a year-on-year increase of 4.0% in Colombia and decreases of 4.0% in Mexico and 5.1% in Puerto Rico. In Colombia, domestic traffic increased 5.8% and international decreased 1.2%. Mexico saw domestic traffic growth of 4.1% and a decrease of 13.6% in international traffic, while Puerto Rico experienced decreases in domestic and international traffic of 4.9% and 5.9%, respectively.

All figures in this statement reflect comparisons between the period from August 1 to August 31, 2026, and from August 1 to August 31, 2025. Passenger traffic from the airports incorporated to ASUR´s platform on September 1, 2026, is not included in the August 2026 figures. Transit and general aviation passengers are excluded only for Mexico and Colombia.

On September 1, 2026, ASUR closed the acquisition of Motiva Airports, adding to its portfolio 17 airports in Brazil, and one each in Costa Rica, Curaçao, and Ecuador. Beginning with its September 2026 passenger traffic report, ASUR will include monthly traffic from these airports

Passenger Traffic Summary
	August		*% Chg*	Year to date		*% Chg*
	2025	2026	*% Chg*	2025	2026	*% Chg*
Mexico	3,296,073	3,164,816	(4.0)	27,875,680	27,087,720	(2.8)
Domestic Traffic	1,790,911	1,864,893	4.1	13,103,789	13,122,495	0.1
International Traffic	1,505,162	1,299,923	(13.6)	14,771,891	13,965,225	(5.5)
San Juan, Puerto Rico	1,186,630	1,126,633	(5.1)	9,757,486	9,422,571	(3.4)
Domestic Traffic	1,023,396	973,038	(4.9)	8,551,044	8,240,103	(3.6)
International Traffic	163,234	153,595	(5.9)	1,206,442	1,182,468	(2.0)
Colombia	1,543,290	1,605,636	4.0	11,240,135	11,984,713	6.6
Domestic Traffic	1,161,127	1,227,903	5.8	8,544,836	9,202,255	7.7
International Traffic	382,163	377,733	(1.2)	2,695,299	2,782,458	3.2
Total Traffic	6,025,993	5,897,085	(2.1)	48,873,301	48,495,004	(0.8)
Domestic Traffic	3,975,434	4,065,834	2.3	30,199,669	30,564,853	1.2
International Traffic	2,050,559	1,831,251	(10.7)	18,673,632	17,930,151	(4.0)

ASUR Page 1 of 3

Mexico Passenger Traffic
		August		*% Chg*	Year to date		*% Chg*
		2025	2026	*% Chg*	2025	2026	*% Chg*
Domestic Traffic		1,790,911	1,864,893	4.1	13,103,789	13,122,495	0.1
CUN	Cancun	921,363	916,107	(0.6)	6,661,817	6,344,963	(4.8)
CZM	Cozumel	25,805	25,175	(2.4)	174,704	176,810	1.2
HUX	Huatulco	61,152	61,980	1.4	448,261	438,032	(2.3)
MID	Merida	317,862	339,227	6.7	2,292,215	2,457,201	7.2
MTT	Minatitlan	13,745	12,422	(9.6)	102,850	91,933	(10.6)
OAX	Oaxaca	140,140	157,276	12.2	1,052,318	1,070,874	1.8
TAP	Tapachula	41,119	49,588	20.6	335,511	347,943	3.7
VER	Veracruz	148,848	168,828	13.4	1,116,351	1,204,870	7.9
VSA	Villahermosa	120,877	134,290	11.1	919,762	989,869	7.6
International Traffic		1,505,162	1,299,923	(13.6)	14,771,891	13,965,225	(5.5)
CUN	Cancun	1,402,782	1,192,427	(15.0)	13,776,321	12,930,607	(6.1)
CZM	Cozumel	18,346	17,572	(4.2)	283,973	274,037	(3.5)
HUX	Huatulco	1,227	1,620	32.0	100,945	112,443	11.4
MID	Merida	32,238	35,148	9.0	270,140	282,230	4.5
MTT	Minatitlan	725	846	16.7	5,185	6,047	16.6
OAX	Oaxaca	23,454	20,043	(14.5)	181,199	159,576	(11.9)
TAP	Tapachula	3,055	6,267	105.1	16,858	38,231	126.8
VER	Veracruz	15,116	16,554	9.5	103,555	111,001	7.2
VSA	Villahermosa	8,219	9,446	14.9	33,715	51,053	51.4
Traffic Total Mexico		3,296,073	3,164,816	(4.0)	27,875,680	27,087,720	(2.8)
CUN	Cancun	2,324,145	2,108,534	(9.3)	20,438,138	19,275,570	(5.7)
CZM	Cozumel	44,151	42,747	(3.2)	458,677	450,847	(1.7)
HUX	Huatulco	62,379	63,600	2.0	549,206	550,475	0.2
MID	Merida	350,100	374,375	6.9	2,562,355	2,739,431	6.9
MTT	Minatitlan	14,470	13,268	(8.3)	108,035	97,980	(9.3)
OAX	Oaxaca	163,594	177,319	8.4	1,233,517	1,230,450	(0.2)
TAP	Tapachula	44,174	55,855	26.4	352,369	386,174	9.6
VER	Veracruz	163,964	185,382	13.1	1,219,906	1,315,871	7.9
VSA	Villahermosa	129,096	143,736	11.3	953,477	1,040,922	9.2

US Passenger Traffic, San Juan Airport (LMM)
	August		*% Chg*	Year to date		*% Chg*
	2025	2026	*% Chg*	2025	2026	*% Chg*
SJU Total	1,186,630	1,126,633	(5.1)	9,757,486	9,422,571	(3.4)
Domestic Traffic	1,023,396	973,038	(4.9)	8,551,044	8,240,103	(3.6)
International Traffic	163,234	153,595	(5.9)	1,206,442	1,182,468	(2.0)

Colombia Passenger Traffic Airplan
		August		*% Chg*	Year to date		*% Chg*
		2025	2026	*% Chg*	2025	2026	*% Chg*
Domestic Traffic		1,161,127	1,227,903	5.8	8,544,836	9,202,255	7.7
MDE	Rionegro	881,557	927,433	5.2	6,468,379	6,941,264	7.3
EOH	Medellin	116,374	106,730	(8.3)	784,571	782,209	(0.3)
MTR	Monteria	114,038	145,273	27.4	915,149	1,088,996	19.0
APO	Carepa	15,700	14,371	(8.5)	117,014	121,368	3.7
UIB	Quibdo	29,867	31,547	5.6	224,983	249,573	10.9
CZU	Corozal	3,591	2,549	(29.0)	34,740	18,845	(45.8)
International Traffic		382,163	377,733	(1.2)	2,695,299	2,782,458	3.2
MDE	Rionegro	382,163	377,733	(1.2)	2,695,299	2,782,363	3.2
EOH	Medellin
MTR	Monteria	-			-	95	-
APO	Carepa	-	-		-	-
UIB	Quibdo	-	-		-	-
CZU	Corozal	-	-		-	-
Traffic Total Colombia		1,543,290	1,605,636	4.0	11,240,135	11,984,713	6.6
MDE	Rionegro	1,263,720	1,305,166	3.3	9,163,678	9,723,627	6.1
EOH	Medellin	116,374	106,730	(8.3)	784,571	782,209	(0.3)
MTR	Monteria	114,038	145,273	27.4	915,149	1,089,091	19.0
APO	Carepa	15,700	14,371	(8.5)	117,014	121,368	3.7
UIB	Quibdo	29,867	31,547	5.6	224,983	249,573	10.9
CZU	Corozal	3,591	2,549	(29.0)	34,740	18,845	(45.8)

ASUR Page 2 of 3

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 expanded its airport portfolio with the addition of 17 airports in Brazil, Latin America’s largest aviation market by passenger traffic, as well as one airport each in Ecuador, Costa Rica and Curaçao.

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

-      END      -

ASUR Page 3 of 3

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EX-99.1 EXHIBIT 99.1 141.4 KB