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Jones Day

Phil Proger

Work 1 202 879 4668
Jones Day

Work Department

Antitrust & Competition Law.


Phil Proger practices antitrust law with emphasis on matters before US and international enforcement agencies, including mergers and cartel investigations, as well as antitrust litigation. Phil also oversees Jones Day's worldwide Antitrust & Competition Law Practice. He has extensive experience advising on antitrust issues in a broad range of industries, including health care, chemicals, insurance, media, pharmaceuticals, software, and retail. He has represented companies and individuals in criminal and civil cartel investigations conducted simultaneously in multiple jurisdictions and defended those clients in follow-up class actions, private treble damage actions, and non-US damage actions. He also has handled numerous investigations by antitrust enforcement agencies involving mergers and nonmerger conduct (including conduct involving licensing, patent settlements, and refusals to deal).


Phil has served as a member of the Board of Governors of the American Bar Association (2003-2006), Chair of the ABA Section of Antitrust Law (1998-1999), and Co-Chair of the ABA’s 2008 Transition Report to the new Administration on antitrust enforcement. He is a frequent writer and speaker on antitrust topics and has testified before Congress (Senate and House of Representatives), the Federal Trade Commission, the Antitrust Modernization Commission, and the International Competition Policy Advisory Committee. He is a member of The American Law Institute, a Fellow of the American Bar Foundation, the advisory boards of BNA Antitrust & Trade Regulation Report and The M&A Lawyer, and the Board of Visitors of the University of Maryland School of Law.


University of Maryland (J.D. with honors 1973; Law Review; Moot Court National Team; B.A. 1969).

United States: Antitrust

Merger control

Within: Merger control

Jones Day, which is a major force in multibillion-dollar transactions, handles the entire ambit of antitrust issues for US and global companies. In 2017, a team led by Phillip Proger, John Majoras and San Francisco-based Margaret Ward acted as antitrust and trial counsel to Aetna in its $37bn acquisition of fellow health insurer Humana. Another matter saw Majoras, Julia McEvoy and others advise Parker Hannifin on a lawsuit filed by the DOJ challenging the client’s $4.3bn acquisition of Clarcor Inc; this matter represented the first DOJ challenge of a consummated merger under the Trump administration. Other practitioners are Michael Knight, recently promoted partner Aimee DeFilippo, Kenneth Field, Michael Gleason and Chicago-based Erin Shencopp. Named individuals are located in Washington DC, except where otherwise stated. David Wales departed the firm.

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    The Hiring Incentives to Restore Employment Act 2010, enacted on 18 March 2010, imposes a new US withholding tax and reporting regime, known as the Foreign Account Tax Compliance Act (FATCA). The FATCA regime applies generally to payments made after 31 December 2012, except on obligations (to be defined in future guidance) outstanding on 18 March 2012. Substantial effort is required by foreign entities to bring their worldwide operations and policies into compliance with the FATCA rules as of the effective date.

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