The Wait Is Over: DOJ And FTC Issue Final Merger Guidelines

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On December 18, 2023, the Federal Trade Commission and Department of Justice (the "Agencies") jointly issued Final Merger Guidelines, following a public comment period on the Proposed Merger Guidelines first issued in July. The Final Merger Guidelines update and replace the 2010 Horizontal Merger Guidelines and the rescinded 2020 Vertical Merger Guidelines. The Final Merger Guidelines kept important components from the Proposed Merger Guidelines (e.g., lower thresholds rendering certain transactions presumptively illegal, focus on cumulative effects of multiple acquisitions, etc.). Among the most significant developments from prior iterations of the merger guidelines are the adoption of a market share threshold in determining when a transaction is presumed to be illegal, expansion of the concept of vertical mergers to include mergers involving "related" products or services, and formal espousal of the current Administration's focus on the impact