The Securities and Exchange board of India (Sebi) surveillance team has conducted a special inspection of the books of the Delhi- based technology firm OPG securities to check if it got unfair access to National Stock Exchange Ltd (NSE) co - location server, said a source privy to the development.
Sebi officials visited trading firm premises in New Delhi last week and quizzed some of the executives. Regulator believed to have also sought trading data for the period of three years (2011-2014).
"It is important to quantify the extent of the illicit gains made by the trading members before finalising