United Internet AG is a GermanInternet services company. With 2.91 million DSL customer contracts, it is a leading ISP in Germany. It is headquartered in Montabaur, Rhineland-Palatinate. Since 2003, it is listed on the TecDAX. In its operating business, United Internet AG acts primarily via 1&1 Internet and is active in various countries (as of February 2014: Austria, Canada, France, Germany, Italy, Mexico, Poland, Spain, United Kingdom, and USA).
In July 2008, United Internet AG acquired a 30% stake in Jimdo GmbH. Jimdo's website builder became the core of 1&1's MyWebsite product (formerly dubbed "MyBusiness Site)". Jimdo bought back its shares in 2009.
In 2013, through its subsidiary United Internet Ventures the company acquired a 25% share in Open Source Software company Open-Xchange.
In February 2014 United Internet announced the acquisition of a 25% stake in e-commerce software company ePages. ePages announced on the same day that the company will provide a new global e-commerce platform for customers of United Internet's 1&1 brand.