While regulators and law enforcement elsewhere in the world routinely meet with investment companies to monitor trading for potential abuse and illegal activity, they seldom do so with the aim of steering the direction of the markets. The government has offered few details about the various investigations, contributing to the atmosphere of uncertainty. In late August, it announced the arrests of eight executives at state-owned Citic Securities, the country's largest brokerage firm and investment bank, including four members of its senior management, on suspicion of insider trading.