Ralph Dommermuth Net Worth

Ralph Dommermuth has an estimated net worth of $3.2 billion, according to Forbes Real-Time Billionaires, Ralph Dommermuth profile (figures as of October 20, 2026). That is down from a peak of $4.3 billion.

Ralph Dommermuth is a German entrepreneur and the founder, chairman and CEO of United Internet, one of Europe's leading internet companies. Born in 1963, he grew up in Montabaur as the son of a realtor. After training at Deutsche Bank, he began selling computers in 1983 as a freelancer for a local PC dealer. Forbes counts him as self-made.

In 1988 he started 1&1 with a business partner, using a borrowed desk and $285,000 he had saved from his sales work. The company first marketed software, then turned into an internet service provider from 1996. In 1998, 1&1 became the first internet company listed on the Neuer Markt, Germany's exchange for high-tech firms. The business later grew into United Internet.

How Ralph Dommermuth makes money

Dommermuth's fortune comes from his large stake in United Internet, of which Forbes says he owns around 50%. The group serves home users and businesses with brands including 1&1, GMX and Web.de. It has expanded into mobile phone services and data centers. The 1998 stock listing gave the company money to invest in other tech firms, which helped it grow quickly.

Mobile networks became a major focus. In 2019, 1&1 AG took part in Germany's 5G frequency auction, laying the base for a fourth mobile network in the country. Dommermuth also owns a 5% stake in Borussia Dortmund, the Bundesliga soccer club, which he bought in early March 2020. His wife, fashion designer Judith Dommermuth, sits on the club's supervisory board.

How his Forbes estimate has changed

Forbes estimated Dommermuth at $3.5 billion in 2019. His figure fell to $2.7 billion in 2020, then jumped to $4.3 billion in 2021, his high point in this period. It then dropped to $3.3 billion in 2022 and $2.1 billion in 2023. Because his wealth is tied to listed shares, these moves largely follow United Internet's stock price.

His estimate has since recovered. Forbes put him at $2.6 billion in 2024 and $2.5 billion in 2025, then $3.8 billion on its 2026 World's Billionaires List. As of October 20, 2026, the Forbes real-time billionaires tracker showed $3.2 billion. In 2006 he founded the United Internet for UNICEF foundation, which has raised more than EUR 50 million and become one of UNICEF's biggest individual donors.