Fix stock market rules before admitting IEX: Nasdaq CEO

By John McCrank NEW YORK (Reuters) - Regulators should overhaul decade-old rules that govern the U.S. stock market before allowing upstart venue IEX Group to become a fully-fledged exchange, Bob Greifeld, head of Nasdaq Inc , said on Thursday. IEX, a market operator featured in Michael Lewis's book, "Flash Boys: A Wall Street Revolt," is currently a private trading venue. It applied in September with the U.S. Securities and Exchange Commission to become a public exchange.