3U Holding AG (3U) is an investment holding company, based in Germany. The company provides services related to telecommunication and renewable energy sectors. Its investments are categorized into three divisions, namely, segment telephony, segment renewable energies, and segment services. Its investment portfolio under segment telephony consists of 010017 Telecom GmbH, 3U Energy AG and 3U Dynamics GmbH. 3U offers broadband/Internet protocol services. The company’s investment portfolios under the segment renewable energies include 3U Energy AG, Immowerker GmbH, 3U SOLAR (PTY) Ltd, and ClimaLevel Energiesysteme GmbH. It operates through its subsidiary, LambdaNet Communications AG, which offers transmission solutions for operators, internet service providers and business customers. 3U is headquartered in Marburg, Germany.