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The Federal Trade Commission sued to block John Muir Health’s proposed $142.5 million deal to acquire sole ownership of San Ramon Regional Medical Center, LLC from current majority owner Tenet Healthcare Corporation, saying the deal will drive up health care costs.

The Commission issued an administrative complaint and authorized a lawsuit in federal court alleging the proposed acquisition will eliminate head-to-head competition between John Muir Health and nearby San Ramon Regional Medical Center.

On December 18, 2023  the FTC and California moved to dismiss their federal court case and the FTC dismissed its administrative challenge following John Muir announcing it would terminate its proposed deal to acquire Tenet’s remaining interest in San Ramon Medical Center.

On December 13, 2023, the FTC moved to dismiss its case challenging the transaction following Sanofi’s decision to terminate its transaction with Maze Therapeutics Inc.

In August 2023, the FTC reached a proposed consent order with Amgen Inc. to address the potential competitive harm that would result from Amgen’s $27.8 billion acquisition of Horizon Therapeutics plc. As part of a nationwide settlement of their challenge to the acquisition, the FTC and attorneys general from six states – California, Illinois, Minnesota, New York, Washington, and Wisconsin – also dismissed the related federal court preliminary injunction action, allowing the transaction to proceed, with the conditions imposed by the order. In December 2023, the FTC finalized the consent order with Amgen Inc. and appointed a monitor.