In 1983, Prof. Sigram Schindler founded TELES GmbH as a high-tech company for operating systems/communications/text and security technology. Close collaboration with the Technical University Berlin, played a key role in the early years of the company. In a very short space of time, TELES' research and development activities made the company a much sought after partner for major international enterprises, especially in the area of R&D for telecommunications standardization in international standardization bodies (ISO, CCITT/ITU, ETSI, IETF,...).

The company shifted its emphasis in the early 1990s to the development and marketing of its own trendsetting products for the telecommunications market, products that have since brought the company much success in the mass market. TELES later focused on Web hosting services for consumers and the small business sector, a move that proved to be groundbreaking. The rapid growth in the number of domains hosted by the concern transformed TELES very quickly into one of the market leaders in the area of Web hosting worldwide. At the end of 2004, the Web hosting business was sold to freenet.de, allowing the company to concentrate on the areas of business promising the best growth dynamics for the future, wireless broadband Internet access services via satellite (skyDSL) and switching systems for voice and data services.

According to Impulse, the economics magazine, TELES AG was one of the 50 most successful companies in Germany in 1996. Most recently, TELES AG made third place among TecDAX companies in a study carried out for Focus Money on company earning power and the quality of the information contained in the annual reports.