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

In the period from 08 December 2025 up to and including 12 December 2025, IONOS Group SE purchased a total of 242,581 treasury shares as part of the share buyback program. The start of the share buyback program was announced on 26 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:

Date	Overall volume of the shares bought back daily (number)	Volume-weighted average stock market price in EUR (excluding incidental purchasing costs, rounded to four places according to commercial practice)
08.12.2025	41,134	25.8883
09.12.2025	57,616	25.9095
10.12.2025	50,223	25.6638
11.12.2025	43,790	25.9010
12.12.2025	49,818	26.1433

Therefore, the overall volume of the shares bought back by IONOS Group SE through the share buyback program since 26 November 2025 is 530,887 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, 15 December 2025
IONOS Group SE
The Management Board