WASHINGTON (MarketWatch) -- FXCM has been banned from operating in the U.S. after the Commodity Futures Trading Commission found the retail currency broker had an undisclosed interest in the market maker that consistently "won" the largest share of FXCM's trading volume - and thus was taking positions opposite its retail customers. The CFTC also found that FXCM willfully made false statements to the National Futures Association in order to conceal FXCM's role in the creation of its principal market maker as well as the fact that the market maker's owner had been an FXCM employee and managing director. FXCM also agreed to pay a $7 million fine and never seek to register with the CFTC, and the two founding partners, Dror Niv and William Ahdout, will withdraw from CFTC registration. FXCM, Niv and Ahdout didn't admit or deny the findings.