This is an interesting article on how GE is the biggest BPO employer

It says Over a quarter of the people employed in the country's Information Technology-Enabled Services sector are on the rolls of multinationals like GE Capital, Standard Chartered, AOL and HSBC, involved in captive business processes outsourcing. The top seven captive multinational BPO companies in the country employ over 28,000 people, slightly more than 25 per cent of the 110,000 people employed in the sector, according to National Association of Software and Service Companies estimates.