After near three-year probe, Sebi action in NSE colo case in a 'few days' The exchange, its officials, brokers could face enforcement action The Securities and Exchange Board of India (Sebi) will soon initiate enforcement action against country's largest stock exchange the National Stock Exchange (NSE) and various other entities involved in an infamous co-location (colo) controversy. The market regulator has been probing the case since early 2015 following multiple complaints that some brokers got preferential access at the exchange’s colo servers. “We have received investigation reports from the forensic auditors and also from the internal team. We have taken into consideration their recommendations and will be initiating enforcement action on institution and individuals in the coming few days,” said Sebi chairman Ajay Tyagi, while briefing the press on Thursday. Tyagi further said that the issue was complex and have taken almost one year to ...