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President-elect Donald Trump’s choice to run the sprawling government agency that administers Medicare, Medicaid, and the Affordable Care Act marketplace — celebrity doctor Mehmet Oz — recently held broad investments in health care, tech, and food companies that would pose significant conflicts of interest.
Oz’s holdings, some shared with family, included a stake in UnitedHealth Group worth as much as $600,000, as well as shares of pharmaceutical firms and tech companies with business in the health care sector, such as Amazon. Collectively, Oz’s investments total tens of millions of dollars, according to financial…