Bloomberg Anywhere Remote Login Bloomberg Terminal Request a Demo


Connecting decision makers to a dynamic network of information, people and ideas, Bloomberg quickly and accurately delivers business and financial information, news and insight around the world.


Financial Products

Enterprise Products


Customer Support

  • Americas

    +1 212 318 2000

  • Europe, Middle East, & Africa

    +44 20 7330 7500

  • Asia Pacific

    +65 6212 1000


Industry Products

Media Services

Follow Us

High-Frequency Trading Needs Tighter Control, AMF’s Jouyet Says

May 27 (Bloomberg) -- Regulators may need to develop “circuit-breakers” that halt high-frequency trading practices like those that exacerbated a stock market plunge a year ago, said the head of France’s financial markets regulator.

The measure, “rather like a pilot switching from autopilot to manual mode when he needs to take control, is necessary in my view, in the same way as what has been decided in the United States,” Jean-Pierre Jouyet, chairman of Autorite des Marches Financiers, said in a speech at the International Capital Market Association annual conference in Paris today.

High-frequency trading is a computer-driven trading method in which firms may make thousands of transactions a second. The so-called flash crash of May 6, 2010, which temporarily erased $862 billion in stock value, spurred U.S. Securities and Exchange Commission proposals for market circuit breakers and plans to establish a system for cross-market surveillance.

The rise of high-frequency trading techniques has made it harder for investors to analyze movements in markets, Jouyet said. “Precise rules” are required to ensure markets can “return to their role of financing the economy,” he said.

To contact the reporter on this story: Ben Martin in London at

To contact the editor responsible for this story: Paul Armstrong at

Please upgrade your Browser

Your browser is out-of-date. Please download one of these excellent browsers:

Chrome, Firefox, Safari, Opera or Internet Explorer.