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Kenneth Griffin, founder and chief executive officer of Citadel LLC, speaks during the Skybridge Alternatives (SALT) conference in Las Vegas, Nevada, U.S., on Wednesday, May 11, 2016. The SALT Conference facilitates balanced discussions and debates on macroeconomic trends, geopolitical events, and alternative investment opportunities within the context of a dynamic global economy. Photographer: David Paul Morris/Bloomberg via Getty Images

Kenneth Griffin, founder and chief executive officer of Citadel LLC, speaks during the Skybridge Alternatives (SALT) conference in Las Vegas, Nevada, U.S., on Wednesday, May 11, 2016. The SALT Conference facilitates balanced discussions and debates on macroeconomic trends, geopolitical events, and alternative investment opportunities within the context of a dynamic global economy. Photographer: David Paul Morris/Bloomberg via Getty Images