John Mattson Fastighetsföretagen AB (publ) operates as a residential property owner. It owns, develops, and manages approximately 4,294 rental apartments, as well as commercial premises and leasehold properties in municipalities, including Lidingö, Sollentuna, Stockholm, Nacka, and Upplands Väsby. The company was founded in 1965 and is headquartered in Lidingö, Sweden.