Kallskär

Kallskär AB is a Stockholm, Sweden-based investment vehicle that manages movable and immovable property, primarily serving as the personal investment vehicle for Harald Mix and associated with Vargas Holding, funding impact companies in sustainable sectors. Operating with an evergreen approach, Kallskär AB strategically finances investments across sustainable sectors including energy, steel, hydrogen, home energy-tech, and textiles. The firm typically averages one investment annually, with an average round investment of $175.5 million, and its portfolio features notable companies such as Aira, Polarium, Stegra, and Syre. Harald Mix, leveraging Kallskär AB, notably committed to Aira's €150 million equity round in 2025, a significant investment aimed at accelerating the expansion of heat pump solutions. Kallskär AB was founded in 2011.