Aetna Inc. (NYSE: AET) ended its $37 billion takeover of Humana Inc. (NYSE: HUM), after deciding not to appeal a ruling by a federal judge who blocked the health insurers’ combination on antitrust grounds.

The companies came to a mutual agreement to terminate the deal, and Aetna will pay Humana a $1 billion breakup fee, or about $630 million after taxes. A plan to divest some assets to Molina Healthcare Inc. (NYSE: MOH), a remedy that was rejected by the judge, was also canceled, Aetna said in a statement.

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