Ralph Dommermuth
Net worth: 3 080 M $ as of 30/12/2025
Profile
Founder of United Internet AG and 1&1 IONOS SE, Ralph Dommermuth is a businessperson who has been at the helm of 6 different companies and presently holds the position of Chief Executive Officer at United Internet AG and Chairman-Supervisory Board at Drillisch Netz AG and Chief Executive Officer at 1&1 Drillisch AG (both are subsidiaries of United Internet AG). In the past Ralph Dommermuth was Co-Managing Director at RD-II Projektentwicklungs GmbH & Co. KG, Chairman for United Internet Media AG, Chief Executive Officer for Drillisch AG and Member-Supervisory Board at 1&1 IONOS SE.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
UNITED INTERNET AG 48.94% | 30/12/2024 | 93,955,205 ( 48.94% ) | 3 058 M $ | 30/12/2025 |
Borussia Dortmund GmbH & Co. KGaA
 Borussia Dortmund GmbH & Co. KGaA Movies/EntertainmentConsumer Services Operates a professional football club 5.03% | 29/06/2025 | 5,552,929 ( 5.03% ) | 22 M $ | 30/12/2025 |
Latest news about Ralph Dommermuth
Ralph Dommermuth active positions
| Companies | Position | Start |
|---|---|---|
| UNITED INTERNET AG | Chief Executive Officer | 28/01/1988 |
| 1&1 AG | Chief Executive Officer | 31/12/2017 |
| IONOS GROUP SE | Chairman | 25/01/2023 |
Ralph Dommermuth Beteiligungen GmbH
 Ralph Dommermuth Beteiligungen GmbH Miscellaneous Commercial ServicesCommercial Services Provides business and economic services | Chief Executive Officer | - |
1&1 Telecommunication SE
 1&1 Telecommunication SE Provides internet services | Director/Board Member | - |
United Internet Investments Holding GmbH
 United Internet Investments Holding GmbH Investment ManagersFinance Functions as an alternative investment manager | Chief Executive Officer | - |
Fashion Outlet Grundbesitz GmbH & Co. KG
 Fashion Outlet Grundbesitz GmbH & Co. KG Buys and sells land, buildings & apartments | Chief Executive Officer | - |
Drillisch Netz AG | Chairman | 15/01/2020 |
Internet Economy Foundation
 Internet Economy Foundation Operates as a internet economy foundation | Chairman | - |
Former positions of Ralph Dommermuth
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Experiences
Positions held
Connections
1st degree connections
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 20 |
|---|---|
1&1 IONOS SE
 1&1 IONOS SE Data Processing ServicesTechnology Services Provides web hosting services | Technology Services |
United Internet AG
 United Internet AG Major TelecommunicationsCommunications Provides fixed-line & mobile internet access products and cloud applications | Communications |
Sedo Holding AG
 Sedo Holding AG Advertising/Marketing ServicesCommercial Services Markets on-line advertising space | Commercial Services |
Drillisch AG
 Drillisch AG Specialty TelecommunicationsCommunications Provides telecommunications services | Communications |
Tele Columbus AG
 Tele Columbus AG Cable/Satellite TVConsumer Services Provides cable television, telephone communications and internet subscription services | Consumer Services |
STRATO AG
 STRATO AG Data Processing ServicesTechnology Services Provides web hosting services | Technology Services |
United Internet Investments Holding GmbH
United Internet Investments Holding GmbH Investment ManagersFinance Functions as an alternative investment manager | Finance |
Ralph Dommermuth Beteiligungen GmbH
Ralph Dommermuth Beteiligungen GmbH Miscellaneous Commercial ServicesCommercial Services Provides business and economic services | Commercial Services |
United Internet Media GmbH
 United Internet Media GmbH Provides online media services | |
Rocket Internet SE
 Rocket Internet SE Identifies, invests and designs internet business models, internet and technology companies | |
1&1 Telecommunication SE
1&1 Telecommunication SE Provides internet services | |
1&1 Mail & Media Applications SE
 1&1 Mail & Media Applications SE Provides telecommunications services | |
Drillisch Netz AG | |
1&1 AG
 1&1 AG Provides telecommunication services | |
RD-II Projektentwicklungs GmbH & Co. KG
 RD-II Projektentwicklungs GmbH & Co. KG Provides administration and management services | |
Fashion Outlet Grundbesitz GmbH & Co. KG
Fashion Outlet Grundbesitz GmbH & Co. KG Buys and sells land, buildings & apartments | |
IONOS Holding SE
 IONOS Holding SE Provides business advisory services | |
1&1 EDV Marketing GmbH | |
Internet Economy Foundation
Internet Economy Foundation Operates as a internet economy foundation | |
IONOS Group SE
 IONOS Group SE Offers web hosting, domain registration and cloud solutions |
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