Prada was Chairman of the French Securities Regulator from 1995 until 2002. He was Chairman of the Executive Committee of the International Organization of Securities Commissions (IOSCO) from September 1996 to September 1998, and Chairman of the Technical Committee from September 1998 to May 2000. He was again Chairman of the Technical Committee from 2006 to 2008. In November 2003 he became Chairman of the Autorité des Marchés Financiers, which regulates the stock market. Prada was a founding member of the Financial Stability Forum, the Forum of European Securities Commissions and the Committee of European Securities regulators.