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Civil Enforcement

The Antitrust Division’s civil enforcement program protects and promotes competition on behalf of the American people. The Antitrust Division has statutory authority to challenge mergers and acquisitions that may lessen competition or tend to create a monopoly and to investigate and prosecute other civil nonmerger offenses.

Civil Enforcement Sections and Offices

Statutes and Guidelines

Antitrust Statutory Provisions

Vertical Merger Guidelines (June 30, 2020)

The following superseded Non-Horizontal Merger Guidelines are provided for historical purposes:

Horizontal Merger Guidelines (August 19, 2010)

The following superseded Merger Guidelines are provided for historical purposes:

Commentary on the Horizontal Merger Guidelines (March 2006)

Herfindahl-Hirschman Index

Merger Enforcement Workshop (February 2004)

Antitrust Guidelines for Collaborations Among Competitors (April 2000)

The following merger remedies policies are provided for historical purposes:

Model Documents and Procedures

Second Request Internal Appeal Procedure (June 2001)

2006 Merger Review Process Initiative

Merger Review Process Initiative (Revised December 14, 2006)

Press Release: Antitrust Division Announces Amendments to Its 2001 Merger Review Process Initiative (December 15, 2006)

Background Information on the 2006 Amendments to the Merger Review Process Initiative (December 14, 2006)

Model Process and Timing Agreement (for use only as part of the Merger Review Process Initiative) (December 14, 2006)

Report to Congress Regarding Merger Review Procedures (June 19, 2001)

Bank Merger Competitive Review

Antitrust Division Banking Guidelines Review: Public Comments Topics & Issues Guide (December 17, 2021)

Frequently Asked Questions regarding applications filed with the Board of Governors of the Federal Reserve System (October 9, 2014)

Bank Merger Competitive Review: Introduction and Overview (1995) (Current as of September 13, 2000)

Hart-Scott-Rodino (HSR) Premerger Notification

The following information is available on the FTC’s website:

Hart-Scott-Rodino Act Information

Early Termination Notices

To check on the status of a filing
Email the FTC’s Premerger office at


Ten Year Workload Statistics Report

HSR Annual Reports to Congress (on the FTC’s website)

Merger Challenges Data, Fiscal Years 1999–2003 (December 18, 2003)

Antitrust Division Annual Report (1999): Appendix B includes information on merger challenges from April 1996 to September 1999.

Other Merger Documents

Protocol for Coordination in Merger Investigations Between the Federal Enforcement Agencies and State Attorneys General (March 11, 1998)