John D. Carroll is a partner in the Antitrust & Competition Practice Group in the Washington, D.C. office.

Areas of Practice

John’s practice focuses on civil and criminal antitrust matters, including mergers & acquisitions, strategic counseling and compliance, and global cartel investigations, where he represents clients before the Department of Justice Antitrust Division, Federal Trade Commission, and international and state antitrust enforcement authorities.

Prior to private practice, John was in the Mergers I Division of the Federal Trade Commission’s Bureau of Competition for several years.  While with the FTC, he investigated, challenged, and negotiated settlements in a number of potentially anti-competitive business combinations in the aerospace, technology, consumer products, defense, healthcare, and pharmaceutical industries and received an Award for Meritorious Service for work on merger litigation.

John frequently speaks and writes on antitrust issues.  He was the lead editor on the American Bar Association, Section of Antitrust Law’s Energy Antitrust Handbook, and has held leadership positions in that organization.



John has substantial experience representing large public and private companies in a variety of industries, private equity firms, and healthcare providers in antitrust matters.  Recent representative matters are described below

Healthcare & Life Sciences

  • Lead antitrust counsel for VillageMD in achieving antitrust clearance for its $8.9 billion acquisition of Summit Health.
  • Represented St. Luke’s University Health Network on antitrust aspects of in its entry into Civica Rx, a not-for-profit generic drug company, as a founding member.
  • Represented St. Luke's University Health Network on antitrust aspects of its acquisition of Easton Hospital.
  • Represented Ohio State University Wexner Medical Center and Mercy Health on antitrust aspects of the formation of a statewide affiliation to address Ohio’s critical health needs.
  • Represented Atrium Health on antitrust aspects of the formation of its Musculoskeletal Institute and entry into a co-management arrangement with physician groups.
  • Represented Ochsner Health System it its formation of JOA with Slidell Memorial Hospital.
  • Represented Owens and Minor on antitrust aspects of it acquisition of Byram Healthcare from Mediq.
  • Currently advising health systems and physician groups on variety of antitrust issues, including network formation and potential transactions.
  • Currently advising pharmaceutical and medical device companies on all aspects of competitor collaborations, including mergers, acquisitions, and joint ventures.


  • Currently representing a Fortune 500 public company in the energy industry on antitrust aspects of a joint venture with a competitor
  • Currently advising a number of energy companies on a range of antitrust issues related to pricing and distribution
  • Successfully represented leading gasoline retailer on achieving FTC clearance for its strategic transaction
  • Devised and implemented antitrust compliance strategies for coalitions of energy industry competitors

Consumer Products & Entertainment

  • Represented Energizer Holdings, Inc. on antitrust aspects of it $2 billion acquisition of Spectrum Brands.
  • Represented Carmike Cinemas in the Department of Justice investigation of their sale to AMC theatres, creating the nation’s largest movie theatre chain.
  • Representation of Hanesbrands Inc. in antitrust aspects of its acquisition of Maidenform Brands, Inc., a leading consumer goods company.
  • Represented Bass Pro Group in its successful defense of an FTC investigation of its acquisition of Fishing Holdings LLC, a manufacturer of fishing boats that include Ranger Boats and the Stratos and Triton boat brands.


  • Represented WestRock Company on antitrust aspects of its $4.9 billion acquisition of KapStone Paper & Packaging.
  • Represented Forterra Building Products, a portfolio company of LoneStar Funds, in the formation of a joint venture with a competitor.

Technology & FinTech

  • Represented Xerox Holdings Corporation in its unsolicited offer and proxy contest for HP Inc.
  • Represented Total System Services on antitrust aspects of its $54 billion merger of equals with Global Payments.
  • Advised leading technology companies on range of antitrust issues regarding investigations and transactions.

Global Cartel Investigations

  • Defended multinational companies in criminal investigations alleging antitrust conspiracies.
  • Represented an executive of international auto parts company in connection with a cartel investigation in that industry.



Best Lawyers: Ones to Watch, Best Lawyers, 2023-2024

Recommended Lawyers - Antitrust, Legal 500, 2022-2024

Leading Lawyer – Antitrust, Legal 500, 2020

GCR 100, 2018-2020

Rising Star – Antitrust, Washington Super Lawyers, 2016

  • Legal 500 Recommended Lawyer 2024



Antitrust Law Blog

Energy Law Blog

Government Contracts & Investigations Law Blog

Healthcare Law Blog Posts

Speaking Engagements

  • Panelist, "Antitrust Hot Topics: Spot the Antitrust Issues," American Health Law Association, October 27, 2021
  • Panelist, "2020's Biggest Antitrust Developments and What to Expect in 2021," AHLA's Speaking of Health Law Podcast, February 1, 2021
  • Moderator, “Recent Developments in Health Care & Pharmaceuticals," American Bar Association, Section of Antitrust Law, May 18, 2020 
  • Panelist, "Federal Antitrust Enforcement of the FinTech Industry," Electronic Transactions Association, April 10, 2019
  • Panelist, "Healthcare Antitrust Educational Call," American Health Lawyers Association, December 11, 2018
  • Panelist, "Exclusionary Practices: An Overview," American Health Lawyers Association Annual Meeting, June 27, 2018
  • Panelist, "Recent Developments in Healthcare & Pharmaceuticals," American Bar Association, Antitrust Section, January 24, 2018




ABA Antitrust Section, Vice Chair of Federal Civil Enforcement, 2024-2025

ABA Antitrust Section, Vice-Chair of the Media & Technologies Committee (2021-2022, 2022-2023)

Digital Media


J.D., George Washington University, 2004

B.A., University of Michigan, 2001


  • District of Columbia
  • Maryland
  • Supreme Court of the United States
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