Merger Enforcement

Statutes and Guidelines

Antitrust Statutory Provisions

August 19, 2010

Horizontal Merger Guidelines

The following superseded Horizontal Merger Guidelines are provided for historical purposes:

March 2006

Commentary on the Horizontal Merger Guidelines

Herfindahl-Hirschman Index

February 2004

Merger Enforcement Workshop

June 14, 1984

April 2000

Antitrust Guidelines for Collaborations Among Competitors

October 2004*

Policy Guide to Merger Remedies

* Update: In effect as of September 25, 2018. See Assistant Attorney General Delrahim’s Remarks as Prepared for the 2018 Global Antitrust Enforcement Symposium.

The following superseded Policy Guide to Merger Remedies is provided for historical purposes:

Model Documents and Procedures

November 2019

Model Timing Agreement

November 2018

Model Voluntary Request Letter

Frequently Asked Questions – Voluntary Requests and Timing Agreements

June 2015

Request for Additional Information and Documentary Material Issued to Weebyewe Corporation

June 2001

Second Request Internal Appeal Procedure

2006 Merger Review Process Initiative

Revised December 14, 2006

Merger Review Process Initiative

December 15, 2006

Press Release: Antitrust Division Announces Amendments to Its 2001 Merger Review Process Initiative

December 14, 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)

June 19, 2001

Report to Congress Regarding Merger Review Procedures

Bank Merger Competitive Review

October 9, 2014

Frequently Asked Questions regarding applications filed with the Board of Governors of the Federal Reserve System

Current as of September 13, 2000

Bank Merger Competitive Review: Introduction and Overview (1995)

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)

December 18, 2003

Merger Challenges Data, Fiscal Years 1999–2003

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

Other Merger Documents

March 11, 1998

Protocol for Coordination in Merger Investigations Between the Federal Enforcement Agencies and State Attorneys General

Updated December 4, 2019

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