Markus Klausner

BIODATA Information Technology AG engages in the development and manufacture of network, computer, and communications security products. It offers encryption of telephone conversations, fax transmissions, and videoconferencing. The firm also manufactures products which protect computer networks from attacks by hackers and spies. The company was founded in 1983 and is headquartered in Kassel, Germany.

Troax AB owns and manages real properties. The company is headquartered in Hillerstorp, Sweden.

Viessmann Climate Solutions SE engages in the production of heating, industrial, and refrigeration systems. Its product portfolio includes gas-condensing, oil, and wood boilers, as well as photovoltaic systems and domestic hot water tanks. The company was founded in 1917 and is headquartered in Allendorf, Germany.

Messe Frankfurt GmbH operates as a holding company which specializes in the organization of exhibits. The firm focuses on the consumer goods and leisure, textiles and textile technology, technology and production, mobility and logistics, as well as the entertainment, media and creation sectors. The company was founded on November 22, 1907 and is headquartered in Frankfurt, Germany.

Viessmann Manufacturing Co. (US), Inc. distributes water heaters and boilers in North America. It provides different types of products such as wall-mounted condensing boilers, oil-fired boilers, gas-fired boilers, commercial boilers, indirect-fired domestic hot-water tanks, dual heat exchanger coils, and controls and accessories. The company was founded in 1917 and is headquartered in Warwick, RI.

Part of Viessmann Climate Solutions SE, HBB Hotelbetriebsgesellschaft Battenberg GmbH is a hotel management company based in Battenberg, Germany. The German company manages the Sonne Frankenberg hotel, which has a long tradition of providing a feel-good ambience and excellent service. The hotel is part of the Collection of Fine Private Hotels, which is known for its lived hospitality and exceptional service. The company's CEO's are Gerhard Pohl, Joerg Lenz, Martin Viessmann. The hotel also offers first-class restaurants in Hesse, where guests can enjoy culinary delights.

Part of Carrier Global Corp., Viessmann Shared Service GmbH is a German company that provides accounting and bookkeeping services. The company is based in Allendorf, Germany. The CEOs are Stefan Hoffmann and Vanessa Hellwing. The company was founded in 2007.

Viessmann Werke Allendorf GmbH specializes in the manufacture and development of industrial heating systems. Its product encompasses condensing boilers, pumps, exchagers, and combustion systems. The firm also provides design system technologies and components for wood combustion, and oil and gas condensing applications. The company is headquartered in Allendorf, Germany.

VITO One GmbH is an independent venture capital firm founded in 2015. The firm is headquartered in Allendorf, Germany.

The Viessmann Group is engaged in manufacturing heating and cooling systems. It offers investment, real estate, climate, refrigeration and industrial solutions. The company was founded by Johann Viessmann in 1917 and is headquartered in Allendorf, Germany.

Viessmann France manufactures heating, air conditioning, and refrigeration systems. The private company is located in France.