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

In the period from 25 May 2026 up to and including 29 May 2026, IONOS Group SE purchased a total of 166,904 treasury shares as part of the share buyback program. The start of the share buyback program was announced on 30 March 2026 in accordance with Art. 2 sec. 1 of the Commission Delegated Regulation (EU) 2016/1052 for 30 March 2026. 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)
25.05.2026	10,834	27.7856
26.05.2026	24,864	27.5286
27.05.2026	70,000	26.9345
28.05.2026	29,218	26.6566
29.05.2026	31,988	27.2247

Therefore, the overall volume of the shares bought back by IONOS Group SE through the share buyback program since 30 March 2026 is 1,122,700 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 June 2026 IONOS Group SE The Management Board