A Sebi probe is also underway to quantify the unlawful gains made by the brokers allegedly in connivance with some top NSE officials.
The National Stock Exchange has submitted a forensic audit report on the issue, prepared by consultancy EY, to the regulator Sebi for a review, a few days ago.
Besides, the exchange has also submitted a study conducted by the ISB to determine whether certain NSE brokers made any abnormal profits as a result of getting preferential access to the servers of the exchange with the co-location facility.
The ISB was roped into verifying whether the brokers named by the Deloitte forensic report had indeed profiteered through the facility.