Upstart stock exchange IEX Group Inc. has begun distributing a key market-data feed free over the internet, throwing down a gauntlet to rivals such as the New York Stock Exchange and Nasdaq Inc., for which such data feeds are a big source of revenue. IEX said Wednesday that it had launched a new web-based tool that broadcasts the best price at which traders in its marketplace are willing to buy or sell a stock or exchange-traded...

Source: Wall Street Journal February 22, 2017 12:56 UTC