(Bloomberg) -- The head of the third-biggest U.S. health insurer said he has “serious concerns” about whether or not Obamacare’s new markets are sustainable, echoing criticism from other top for-profit insurers.

“We continue to have serious concerns about the sustainability of the public exchanges,” Aetna Inc. Chief Executive Officer Mark Bertolini said on a call Monday while discussing the company’s fourth-quarter results. “We remain concerned about the overall stability of the risk pool.”

Large U.S. health insurers have faced a rocky start in the Patient Protection and Affordable Care Act, which in 2014 opened up new markets where millions of Americans buy coverage, often with tax subsidies to help them afford it.

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