India’s securities regulator plans to boost its surveillance systems to better detect complex trading strategies after taking action against high-speed trading giant Jane Street Group for alleged market manipulation.

India has temporarily barred Jane Street Group LLC from accessing the local securities market for alleged index manipulation, dealing a severe hit to the US firm that made $4.3 billion in trading gains there in more than two years.

On Monday, futures and options (F&O) turnover on the NSE was Rs 91.4 trillion, a 26 per cent drop from the average of the previous 12 Mondays