ESOS is a wholly owned subsidiary of NETWORK GROUP HOLDINGS PLC (Network Group). Network Group is a diversified recruitment and outsourcing business which operates in many areas of the UK economy and comprises 24 operating subsidiaries. In addition to the ownership of ESOS, which focuses on business process outsourcing, NETWORK GROUP's specialist recruitment business involves the placement of candidates into permanent and/or temporary/contract positions of employment.

See http://www.networkgroupholdings.co.uk for more information.