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Goldman Sachs Endorses IEX Stock Market Built to Fight Predators

IEX Group Inc., a five-month-old trading platform designed to address perceived flaws in the U.S. stock market, has won over one of the world’s biggest traders: Goldman Sachs Group Inc.

In a memo to its equities unit, Goldman Sachs said it’s been one of the most-active brokers on IEX, which opened in October. Markets would be well-served if New York-based IEX achieved “critical mass,” even if that meant Goldman Sachs’s Sigma X dark pool got less volume, according to the document.