Jeff Wecker, president and CEO of Lime Brokerage, attributes the growth to high-frequency traders leaving their existing positions with sell-side proprietary trading desks and multi-strategy trading firms and seeking green opportunities.

"Clearly, there has been a migration taking place in high-frequency trading," he says. "We have seen a growing number of sole proprietorships and we have seen people leaving existing high-frequency trading firms and going out on their own as well."

These new fir

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