Broedrene A & O Johansen A/S is a Denmark-based wholesaler of technical installation materials and supplies to the construction industry. It is engaged in the supply of electrical equipment, as well as plumbing, heating and sanitary products. Its product range serves two main markets: professional and do-it-yourself (DIY). The professional market for technical installation materials includes sanitary products, plumbing, electrical equipment, drainage products, water-supply systems and tools. The DIY market, operated through SEKO department, includes sanitary products, as well as electrical equipment. As of December 31, 2011, AO had a central warehouse located in Albertslund, Denmark and a logistics center in Horsens, Denmark, as well as 47 shops in Denmark, five in Sweden and one in Estonia. As of December 31, 2011, the Company operated through AO-MAVAB and four wholly owned subsidiaries: Ervex AB; AO Invest A/S; Vaga Tehnika Eesti OU and E-byg.com A/S.