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Dr. Lübke & Kelber GmbH is a real estate management company based in Frankfurt, Germany. Dr. Lübke & Kelber GmbH specializes in the management of land, buildings, and apartments. The German company was founded in 1968 by Konrad Lübke and is currently led by CEOs Marc Sahling, Jürgen F. Kelber, and Steffen Schaack.

Arbireo Capital AG is a German company that specializes in bundling real estate and capital market competence. The private company is based in Frankfurt, Germany. The company offers fund solutions and club-deals. The company was founded by Ralf Kind.

JFK Vermögensverwaltungs GmbH provides management services. The company is based in Flein, Germany. The CEOs of the German company are Jürgen Franz Kelber, Larissa Kelber, Stefan Flinspach.

Buntes Wohnen Heilbronn GmbH & Co. KG aims to create a diverse living community where people with disabilities and individuals of all living arrangements can coexist. The private company is based in Heilbronn, Germany. The CEOs of the German company are Jürgen Franz Kelber, Steffen Potrafke.

ING Bank NV (Broker) (ING Bank-Broker) is the broker-dealer division of ING Bank NV, an investment bank headquartered in Amsterdam, Netherlands. It is a wholly-owned subsidiary of ING Groep N.V. (AMS: INGA; NYSE: ING), a Dutch multinational banking and financial services corporation. The firm was founded in 1991 through the merger of Nationale-Nederlanden and NMB Postbank Groep. ING Bank-Broker provides brokerage services to institutions, large corporations, and medium-sized companies.

AK Holding GmbH & Co. KG provides investment services focusing on residential real estate. It specializes in asset management, non performing loans, and investments. The company was founded by Jürgen Franz Kelber and is headquartered in Heilbronn, Germany.

IR.on AG provides management consulting services. Its services include investor relations, corporate actions, M&A activity and financial marketing. The company was founded by Fabian Kirchmann and Achim Josten in 2000 and is headquartered in Koln, Germany.

The Elocations Ltd. provides real estate services. The private company is based in Zug, Switzerland. The Swiss company was founded by Marc C. Riebe.