The Securities and Exchange Commission has been studying a number of proposals that would put an extra burden on firms engaged in highfrequency trading strategies or on firms assisting other firms with highfrequency trading.
The SEC has already proposed a number of changes designed to address their growing influence, including extra restrictions on broker-dealers that provide direct market access to highfrequency traders, a trader tracking system for large traders, circuit breakers that would slow trading in individual stocks if they fall more than 10%, and new rules for off-exchange trading venues.