Tuhin Kanta Pandey, chairman, Securities and Exchange Board of India | Photo: Kamlesh Pednekar The Securities and Exchange Board of India (Sebi) is working towards removing companies with no economic activity from the stock exchanges, as their continued presence in the listed space poses a potential risk to investors, a top official said. There are a number of listed companies with no economic activity, Sebi chairman Tuhin Kanta Pandey said.