Officials said the searches covered multiple premises of the firm in Mumbai and Delhi.
India Inc raised $2.78 billion from overseas markets in October this year, up 44 per cent from a year ago, according to the Reserve Bank data released on Friday.
Kapoor is already facing an ED criminal case for receiving alleged kickbacks, through companies purportedly controlled by his family, for going slow on bad loans extended by his bank to some big corporate.
Prime Minister Narendra Modi's three-day visit to Britain has seen India and the UK agreeing on Rs 90,000 crore deals.