Ulf Peter Jonströmer

BrainHeart Capital AB is a venture capital firm located in Stockholm. Established in 1999, the firm focuses on growth investments in the wireless technology sector. BrainHeart's investors include a range of institutions, insurance firms and pension funds in the Nordic region. Since 2005, Argnor Wireless Ventures, an independent Swedish venture capital firm specializing in early-stage wireless entrepreneurship investments, has worked closely with BrainHeart.

OnePhone Holding AB provides telecommunications investment services. It provides fixed-to-mobile replacement services. The company was founded in 2008 and is headquartered in Stockholm, Sweden.

Spinbox AB provides mobile communication services. It offers invoicing, billing, packaging, sales support, distribution, and personalized customer services. The company provides services to the individuals and commercial organizations. Spinbox was founded by Lotta Ehrnborg in 2001 and is headquartered in Hagersten, Sweden

Spring Mobil AB provides wireless communication services. It develops call handling solutions. The firm offers voice recognition, call management, customer support and mobile data services. Spring Mobil was founded in 2002 and is headquartered in Stockholm, Sweden.

Swefour AB operates as a holding company with interest in wireless telecommunication and data connectivity services. The company was founded on November 2, 2001 and is headquartered in Stockholm, Sweden

Enwell AB provides heating and cooling solutions. Its services include: design and engineering, drilling, installation, financing, support, and remote monitoring and control. The company was founded in 2013 and is headquartered in Stockholm, Sweden.