 Carillion comprised 326 subsidiary companies, joint ventures (a mix of majority and minority shareholdings) and holding companies, 199 in the United Kingdom, plus others in Canada and other countries.Sarah Albon, chief executive of the Insolvency Service told MPs on 30 January 2018 that Carillion had 169 directors in total but poor Carillion record keeping had made determining that number difficult.In March 2015 Carillion moved its head office from Birch Street in Wolverhampton to the former Staffordshire Building Society offices in Wolverhampton.