Despite Hopes, 'Flash Boys' Heroes Are Far From Reshaping US Stock Market – Wall Street Journal (subscription)

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In September, IEX Group Inc. threw a party at Manhattan’s Bowery Hotel to celebrate becoming a full-fledged stock exchange.

The party had guests from high-speed trading firms such as Citadel Securities LLC, Global Trading Systems LLC, IMC Financial Markets and KCG Holdings Inc., people familiar with the situation said. They came even though IEX…