U.S. government’s bid to block insurance mergers could spawn new ones

The U.S. Department of Justice on Thursday sued to block Aetna Inc's $37 billion purchase of Humana Inc and Anthem Inc’s proposed $54 billion buyout of Cigna Corp , arguing that they would cut competition and boost rates for patients. The most obvious targets are midsized, national players in government healthcare plans such as Centene Corp , Molina Healthcare Inc , or WellCare Health Plans Inc , according to analysts and investors.

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U.S. government’s bid to block insurance mergers could spawn new ones