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Mega insurers such as Anthem and Aetna tried to soothe investors after comments from rival UnitedHealth Group on Obamacare sparked a major drop in insurer stocks.

UnitedHealth on Thursday said it would lose $425 million this year due primarily to its participation in Obamacare's marketplaces and that it may exit the exchanges.

In response to the news, the insurers reaffirmed their commitment to Obamacare's exchanges.

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