Shares of U.S. health insurers tumbled Tuesday, after Bloomberg News said U.S. antitrust officials are set to file lawsuits to block the planned mergers of Anthem Inc. and Cigna Corp. , as well as Aetna Inc. and Humana Inc. . Citing a person familiar with the matter, Bloomberg said officials are concerned the deals would stifle competition and harm consumers. The Wall Street Journal has reported that the $34 billion merger of Aetna and Humana, and the $48 billion deal for Anthem to buy Cigna, had faced resistance from the Justice Department, as they would reduce the top five health insurers to just three, and the companies were facing an uphill battle in overcoming those concerns. A decision is expected mid-July. Humana shares fell the most at 5.3%, followed by Aetna, down 4.2%. Anthem was down 3.3% and Cigna lost 2.4%.
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