The High Frequency Trading (HFT) has grown considerably in recent years and today represent the AMF according to 90% of orders sent to the market and about 30% of actual transactions in Europe and Further more. The proportions taken by this practice are as worried. While the regulator, after leading an important discussion on these topic proposals currently before the European Parliament that could lead to a new framework for HFT in 2013, French MPs have meanwhile passed a law to tax this type of exchange on February 16.