M&Co. (previously trading as Mackays, company name Mackays Stores Limited) is a Scottish chain store selling women's, men's, and children's clothes, as well as small homeware products. Its head office is in Inchinnan, Renfrewshire,though its main buying office is in London. Previously, its head office was at Caledonia House in Paisley.Established in 1834, the company has grown to become one of the largest privately owned fashion clothing retailers in Britain, and has been selling clothing for over 50 years. The chain operates over 300 stores and also has an online presence.