A-Companies is a rental housing group owned by the City of Porvoo. A-Companies consist of the parent company Porvoon A-asunnot Oy and Porvoon Vuokra-asunnot Oy. Porvoon A-Asunnot also includes the subsidiary Kiinteistö Oy A-Lukaali Ab.
A-Companies is the largest landlord in Porvoo, with 2,300 rental homes located throughout the city.