Ralph Dommermuth
Chief Executive Officer at
UNITED INTERNET AG
Net worth: 2 910 M $ as of 2026-05-30
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% | 2025-12-30 | 93,955,205 ( 48.94% ) | 2 890 M $ | 2026-05-30 |
Borussia Dortmund GmbH & Co. KGaA
 Borussia Dortmund GmbH & Co. KGaA Movies/EntertainmentConsumer Services Operates a professional football club 5.03% | 2025-06-29 | 5,552,929 ( 5.03% ) | 20 M $ | 2026-05-30 |
Latest news about Ralph Dommermuth
Ralph Dommermuth active positions
| Companies | Position | Start |
|---|---|---|
| UNITED INTERNET AG | Chief Executive Officer | 1988-01-28 |
| 1&1 AG | Chief Executive Officer | 2017-12-31 |
| IONOS GROUP SE | Chairman | 2023-01-25 |
Internet Economy Foundation
 Internet Economy Foundation Investment Trusts/Mutual FundsMiscellaneous Operates as a internet economy foundation | Chairman | - |
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 Specialty TelecommunicationsCommunications Provides internet services | Director/Board Member | - |
United Internet Investments Holding GmbH
 United Internet Investments Holding GmbH Investment ManagersFinance United Internet Ventures invest in companies located in North America and Europe, primarily in Germany. The firm targets companies operating in the fields of internet and digital infrastructure. It provides financing for buyout transactions. The firm also acquires minority interest. | Chief Executive Officer | - |
Fashion Outlet Grundbesitz GmbH & Co. KG
 Fashion Outlet Grundbesitz GmbH & Co. KG Real Estate DevelopmentFinance Buys and sells land, buildings & apartments | Chief Executive Officer | - |
Drillisch Netz AG | Chairman | 2020-01-15 |
Former positions of Ralph Dommermuth
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Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
24
1st degree connections
22
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 22 |
|---|---|
1&1 IONOS SE
 1&1 IONOS SE Data Processing ServicesTechnology Services Provides web hosting services | Technology Services |
1&1 Versatel GmbH
 1&1 Versatel GmbH Major TelecommunicationsCommunications Provides fiber optic network services | Communications |
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 |
1&1 Versatel Deutschland GmbH
 1&1 Versatel Deutschland GmbH Information Technology ServicesTechnology Services Provides information technology services | Technology Services |
United Internet Investments Holding GmbH
United Internet Investments Holding GmbH Investment ManagersFinance United Internet Ventures invest in companies located in North America and Europe, primarily in Germany. The firm targets companies operating in the fields of internet and digital infrastructure. It provides financing for buyout transactions. The firm also acquires minority interest. | 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 Advertising/Marketing ServicesCommercial Services Provides online media services | Commercial Services |
Rocket Internet SE
 Rocket Internet SE Financial ConglomeratesFinance Invests in technology and internet companies | Finance |
1&1 Telecommunication SE
1&1 Telecommunication SE Specialty TelecommunicationsCommunications Provides internet services | Communications |
1&1 Mail & Media Applications SE
 1&1 Mail & Media Applications SE Specialty TelecommunicationsCommunications Provides telecommunications services | Communications |
Drillisch Netz AG | |
1&1 AG
 1&1 AG Specialty TelecommunicationsCommunications Provides telecommunication services | Communications |
RD-II Projektentwicklungs GmbH & Co. KG
 RD-II Projektentwicklungs GmbH & Co. KG Miscellaneous Commercial ServicesCommercial Services Provides administration and management services | Commercial Services |
Fashion Outlet Grundbesitz GmbH & Co. KG
Fashion Outlet Grundbesitz GmbH & Co. KG Real Estate DevelopmentFinance Buys and sells land, buildings & apartments | Finance |
IONOS Holding SE
 IONOS Holding SE Miscellaneous Commercial ServicesCommercial Services Provides business advisory services | Commercial Services |
1&1 EDV Marketing GmbH | |
Internet Economy Foundation
Internet Economy Foundation Investment Trusts/Mutual FundsMiscellaneous Operates as a internet economy foundation | Miscellaneous |
IONOS Group SE
 IONOS Group SE Data Processing ServicesTechnology Services Offers web hosting, domain registration and cloud solutions | Technology Services |
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