Bloomberg Billionaires Index

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#339 Ralph Dommermuth $5.41B

Random fact: Avid sailor who sponsored Team Germany in the 2007 America's Cup.


Dommermuth is founder and chairman of United Internet, which had revenue of 3.9 billion euros ($4.4 billion) in 2016. He owns 40 percent of the Montabaur, Germany-based broadband provider, the manager of the 1&1, GMX and brands. The publicly traded company has about 53 million customers in 12 countries.

As of Sept. 21, 2017:
Last change -$47.2M (-0.9%)
YTD change +$1.96B (+56.7%)
Industry Technology
Biggest asset UTDI GY Equity
Citizenship Germany
Age 53
Wealth Self-made
View net worth over:   Max 1 year 1 quarter 1 month 1 week

Relative Value

Ralph Dommermuth's net worth of $5.41B can buy ...

troy ounces of gold
barrels of crude oil

... and is equivalent to ...

of the GDP of the United States
of the total wealth of the 500 richest people in the world
of the top 100 U.S. college endowments
of the top 200 U.S. executives’ total awarded compensation
of U.S. existing home sales
times the median U.S. household income

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Net Worth Summary

Private asset
Public asset
Misc. liabilities
Confidence rating:

The majority of Dommermuth's fortune is derived from a 40 percent stake in United Internet, which had revenue of 3.9 billion euros ($4.4 billion) in 2016. He started the company in 1988 and sold shares on the Frankfurt Stock Exchange a decade later. United Internet has 53 million customer accounts in 12 countries, according to its website.

The billionaire holds 39.02 percent through Ralph Dommermuth GmbH and Co. KG Beteiligungsgesellschaft, and 0.98% through RD Holding GmbH and Co. KG, according to the company's 2016 annual report.

The value of his cash holdings and other investable assets is based on an analysis of dividends, insider transactions, taxes and market performance.


Birthdate: 11/19/1963
Family: Married, 1 child

Dommermuth was born in Montabaur, Germany, in 1963. He dropped out of high school before enrolling in an apprenticeship at Deutsche Bank. He started his first company at age 24, developing marketing concepts for small software companies. Using the brand United Internet, Dommermuth expanded and within a decade had become one of Europe's first Internet providers. The business sold shares on the Frankfurt Stock Exchange in 1998.

After the Internet bubble of 2000, the billionaire focused his company on web hosting and storage, e-mail services, developing mobile applications, providing marketing solutions for online advertisers and broadband Internet. United operates Internet brands 1 and 1, GMX and

Dommermuth is married to model Judith Berger and has a son from a previous marriage.

  • 1988 Starts first company to develop marketing concepts for software companies.
  • 1998 United Internet sells shares in an initial public offering in Frankfurt.
  • 2000 Company restructured as United Internet.
  • 2007 Sponsors Team Germany in the America's Cup.
  • 2007 Wins Germany's Sport Bild Award for America's Cup efforts.
  • 2014 United Internet buys stake in German startup investor Rocket Internet.
  • 2014 Acquires Versatel, Germany's second largest fibre-optic network.
  • 2016 Company lifts number of customer accounts to 50 million.