EQS-CMS: IONOS Group SE: Release of a capital market information

IONOS Group SE: Disclosure pursuant to Art. 5 Sec. 1 b) and Sec. 3 of the Regulation (EU) No 596/2014 (MAR) in conjunction with Art. 2 Sec. 2 and Sec. 3 of the Commission Delegated Regulation (EU) No 2016/1052 // Share Buyback – 1^st Interim Announcement

In the period from 26 November 2025 up to and including 28 November 2025, IONOS Group SE purchased a total of 60,479 treasury shares as part of the share buyback program. The start of the share buyback program was announced on 25 November 2025 in accordance with Art. 2 sec. 1 of the Commission Delegated Regulation (EU) 2016/1052 for 26 November 2025.

Shares were bought as follows:

Therefore, the overall volume of the shares bought back by IONOS Group SE through the share buyback program since 26 November 2025 is 60,479 shares.

Further information pursuant to Art. 5 sec. 1 b) and sec. 3 of the Regulation (EU) No 596/2014 in conjunction with Art. 2 sec. 2 and sec. 3 of the Commission Delegated Regulation (EU) No 2016/1052 is available online via http://www.ionos-group.com/investor-relations/share/share-buyback.html

The purchase of the treasury shares was carried out by a bank mandated by IONOS Group SE exclusively via the Frankfurt Stock Exchange (XETRA trading).

Montabaur, 01 December 2025

IONOS Group SE

The Management Board