1&1 AG / DE0005545503

1&1 with development according to plan in the first nine months of 2025, forecast for 2025 confirmed   Customer contracts at 16.34 million Service revenues unchanged at €2,479.3 million - 3.0 percent EBITDA (operational) to €611.0 million - 11.5 percent EBITDA (total) to €409.8 million, due to higher start-up costs for the 1&1 mobile network as planned Revenue and earnings forecast for 2025 confirmed   Montabaur, 11 November 2025 – 1&1 AG (ISIN DE 0005545503) recorded a decline of 50,000 contracts to 16.34 million customer contracts in the first nine months of 2025 (December 31, 2024: 16.39 million contracts. While broadband connections declined as expected by 90,000 contracts to 3.86 million (December 31, 2024: 3.95 million contracts), mobile internet contracts increased again by 40,000 new contracts to 12.48 million contracts (December 31, 2024: 12.44 million contracts). The increase in mobile internet contracts is entirely attributable to the third quarter. Overall, revenue reached €3,016.2 million, remaining at the previous year's level (9M 2024: €3,017.2 million). While high-margin service revenue in the first nine months of 2025 was - as planned - slightly above the previous year's level at €2,479.3 million (9M 2024: €2,478.7 million), low-margin hardware sales remained slightly below the previous year's level at €536.9 million (9M 2024: €538.5 million). In the first nine months of 2025, EBITDA in the Access operating segment declined by 3.0% to €611.0 million (9M 2024: €630.1 million). At the same time, start-up costs for the 1&1 mobile network increased as planned to -€201.2 million (9M 2024: -€167.1 million). Overall, EBITDA declined by 11.5% to €409.8 million (9M 2024: €463.0 million). Due to lower EBITDA and increased depreciation and amortization, particularly as a result of the growing number of antenna sites in the 1&1 mobile network, EBIT declined to €175,4 million (9M 2024: €287.5 million). As a result, earnings per share (EPS) in the first nine months came to €0,63 (9M 2024: €1.11). Excluding the impact of PPA write-downs, earnings per share amounted to €0,86 (9M 2024: €1.28). The investment volume (cash capex) amounted to €228,7 million (9M 2024: €70.8 million). Forecast 2025 The company confirms its service revenue and earnings forecast and expects for 2025 a stable contract base and service revenue at the previous year's level (2024: €3,303.1 million). EBITDA is expected to decline to approx. 545 million (2024: €590.8 million). This decline is due to a lower EBITDA in the Access segment, which is expected to reach approx. €810 million (2024: €856.1 million). EBITDA in the 1&1 Mobile Network segment is expected to remain unchanged at approx. -€265 million (2024: -€265.3 million). This includes approximately -€100 million in expenses for customer migration and for network services, which will no longer apply after the complete migration of all customers starting from 2026. The investment volume (cash capex) is now expected to amount to approx. €400 million (previous forecast: approx. €450 million; 2024: €290.6 million).   Performance indicators pursuant to IFRS — comparison 9M 2024 vs. 9M 2025

in €m	9M 2024	9M 2025	Change
Revenue thereof service revenue	3.017,2 2.478,7	3,016.2 2,479.3	-0.0 % +0.0 %
EBITDA thereof segment Access thereof segment 1&1 Mobile Network	463,0 630,1 -167,1	409.8 611.0 -201.2	-11.5 % -3.0 %
EBIT	287,5	175.4	-39.0 %
Earnings per share in €	1,11	0.63	-43.2 %
Customer contracts in million	16,35	16,34	-0.3 %

  This quarterly statement will be made available on the Company’s home page on 11 November 2025. https://www.1und1.ag/investor-relations-en#meldungen-berichte-praesentationen   Montabaur, 11 November 2025   1&1 AG The Management Board   About 1&1 AG 1&1 AG, headquartered in Montabaur, is a listed telecommunications provider and part of the United Internet Group. With a focus on the German market, 1&1 specifically strengthens the country's digital sovereignty. 1&1 is the first network operator in Europe to operate a fully virtualised 5G mobile network based on the new Open RAN technology - independent, technology-agnostic and ready for real-time-applications of the future. As the fourth network, 1&1 O-RAN stands for more competition and innovation in the German mobile communications landscape. In addition to a comprehensive mobile communications portfolio, broadband connections are offered which are based on 1&1 Versatel's Germany-wide fibre-optic transport network and on networks of regional city carriers as well as of Deutsche Telekom. While the 1&1 brand addresses value and premium segments, the Group's discount brands appeal to price-conscious target groups