A Two Sigma chief investment officer has taken a medical leave, Insider has learned. The firm announced the leave of Alex Ginsburg, CIO of equities, to investors and employees in July. A senior Two Sigma investment executive has taken a leave of absence from the firm, Insider has learned. Two Sigma chief data strategist Ali-Milan Nekmouche, who has been with the company since 2004, has been named as Ginsburg's replacement. Siegel did not leave the firm and the group ended up staying at Two Sigma, the Journal reported.

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Persons: Alex Ginsburg, Jeff Penney, Timothy Reynolds, Ali, Milan Nekmouche, Ginsburg's, David Siegel, John Overdeck, Siegel, Overdeck, Ginsburg, Geoffrey Duncombe, Alex Morrell, Rebecca Ungarino Organizations: Sigma, Street Locations: amorrell