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.

By Ira Dugal, Jayshree P Upadhyay and Scott Murdoch MUMBAI (Reuters) -Indian regulators barred U.S. securities trading company Jane Street from the local market and seized $567 million of its funds, saying an investigation found it manipulated stock indices through positions taken in derivatives.

The lawsuit alleged that the traders had stolen a “ highly valuable, unique, and proprietary ” trading strategy, which was quickly revealed to revolve around India’s booming options market. Jane Street and Millennium settled the lawsuit in December, but judging from SEBI’s report it has cast a long (and expensive) shadow.