Castellum is one of the Nordic region's largest commercial property companies, with a focus on office and logistics properties in Nordic growth cities. As of 31 December 2025, the property value, including the holdings in the Norwegian company Entra ASA and Halvorsäng, totaled approximately SEK 137 Bn. The company is listed on Nasdaq Stockholm Large Cap and is classified as green under the Green Equity Designation. Castellum is the only Nordic property company included in the Dow Jones Sustainability Indices (DJSI).