Craig Viani

Lights Out In The Dark: Goodnight Vortex

ConvergEx announced last week that it was euthanizing one of its two dark pools, VortEx. Guest commentator, Craig Viani, one of the dark pool's co-founders, muses about the passing of the ATS.

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In your opinion, who or what is responsible for market crashes, such as on August 24?

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Wes Walker, Rosenblatt, George Mosby, Mark Mechler, both Instinet, all New York.