Nasdaq Inc. Chief Executive Officer Robert Greifeld Interview [Getty Images]

Robert "Bob" Greifield, chief executive officer of Nasdaq Inc., stands for a photograph after a Bloomberg Television interview at the Nasdaq Entrepreneurial Center in San Francisco, California, U.S., on Tuesday, Sept. 27, 2016. Greifield recapped the first year of the Nasdaq Innovation Center in San Francisco and discusses helping companies whether or not they come to market and the momentum of this year's IPO market and backlog. Photographer: Michael Short/Bloomberg via Getty Images

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