US CFTC head: market complexity a factor in time taken to charge trader
April 22, 2015 at 11:54 AM EDT
CHICAGO, April 22 (Reuters) - U.S. financial markets' size and complexity were a factor in how long it took to bring charges against a British trader accused of contributing to Wall Street's "flash crash" nearly five years ago, the head of the U.S. Commodity Futures Trading Commission said on Wednesday.