1&1 AgXETR: 1U1

Proxy to a third person (1u1 Vollmacht dritte Person en)

· Issued by 1&1 AG


Annual General Meeting of 1&1 AG on 20 May 2026 Proxy to a third party

Details of authorizing person

(please write in block letters)

I / We hereby authorize:

First and last name / company / institution*

Email address

Phone number

Ticket number Number of shares

*mandatory

Details of authorized third party

(please write in block letters)

First and last name / company / institution *

Email address **

Address line **

Postcode*City / place of residence (incl. country)*

* mandatory

** Recommended information and note: After receipt of the power of attorney or the proof of authorization, individual access data to the AGM-Portal will be created for the proxy. These will be sent directly to the proxy if the address details of the proxy are complete. If the address details of the proxy are incomplete, the individual access data of the proxy to the password-protected AGM-Portal shall be transmitted to the grantor of the power of attorney for forwarding to the proxy.

revoking any previous authorization, to represent me/us at the Annual General Meeting of 1&1 AG on 20 May 2026, disclosing my / our name(s), and to exercise all shareholder rights. This authorization includes the right to issue a sub-authorization.

Place, date

Signature(s) or name of the authorizing person(s) (legible)

Return address:

1&1 AG Email: 1und1@meet2vote.de

c/o meet2vote AG Marienplatz 1

84347 Pfarrkirchen Germany