Hagen Lessing

Trionista Topco GmbH is a firm with interests in energy services. Its services include development, production and distribution of products for measurement, control of energy consumption, and services relating to the metering and billing of energy consumption data. In addition the firm's service also includes the provision of services to other businesses. The company was founded on September 16, 2013 and is headquartered in Essen, Germany.

Part of Trius Holdings SCA, Ista Metering Services España SA is a company based in Madrid, Spain. Ista Metering Services España SA specializes in providing cost allocation devices, water meters, central heating systems, and more. The Spanish company's services help building owners and managers save energy, costs, and reduce CO2 emissions. The company empower households to have control over their energy consumption by providing insights into where, how much, and how energy is being used. The CEO of the company is Hagen Lessing.

ista International GmbH engages in the provision of energy management services. It also offers detect and protect solutions that include installation and maintenance of smoke alarm devices; and provision of leakage detection and tap maintenance and drinking water analysis services. The company was founded by Johannes Schultz and Karl Volker in 1957 and is headquartered in Essen, Germany.