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Ex-Citadel Managers Plan Health-Care and Tech Fund

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Photographer: David Paul Morris/Bloomberg

Two investors who formerly oversaw multibillion-dollar portfolios at Citadel are teaming up to start a hedge fund.

Michael Rockefeller, who led Citadel’s health-care team in San Francisco, and Karl Kroeker, who specialized in technology investments, are launching the fund, according to people with knowledge of the matter. The pair added Matthew Hooker, former head of U.S. trading at Citadel’s global equities business, as chief operating officer.