The Department of Justice is investigating high-frequency stock trading to see if any of the practices violate insider trading laws, U.S. Attorney General
Brokerage firms use high-frequency trading to get a jump on their competitors. Powerful computers analyze market information and then execute buy and sell orders for stocks within a fraction of a second.
"The Department is committed to ensuring the integrity of our financial markets - and we are determined to follow this investigation wherever the facts and the law may lead," Holder told a House hearing in prepared remarks.
The practice has come under increasing scrutiny in recent months. The