Castellum is a Swedish property company that owns, manages, and develops commercial properties in growth cities. As of 31 March 2026, the property value amounted to approximately SEK 138 Bn. The company is listed on Nasdaq Stockholm Large Cap and is classified as green under the Green Equity Designation. Castellum is the only Swedish property company included in the Dow Jones Sustainability Indices (DJSI). Castellum AB (publ) is incorporated in Sweden.