Japan Exchange Group is set to revise its guidelines on derivatives trading, following a series of bond futures manipulation scandals at Nomura Holdings and other major global banks.

JPX will clarify the criteria for reviewing derivatives transactions so that financial firms can establish more effective oversight, themselves, of trading in products, including Japanese government bond futures.

Japan’s largest bourse operator conveyed the plan to market participants at its derivatives exchange in Osaka on Thursday, according to a spokesperson. The revision will be made in the coming days, he said.