Drawing on our lawyers’ broad experience, we offer clients exceptional insight in dealing with competition agencies in the United States, Europe and around the world.

WilmerHale has one of the leading antitrust and competition practices in the United States and Europe, with more than 50 years of experience and more than 70 competition lawyers in the United States, Europe and China. We have secured antitrust clearance for hundreds of complex mergers and joint ventures, helped clients avoid fines and prison terms in many cartel investigations, and won numerous victories for clients in private and government litigation. Many of our partners and senior counsel have served in high levels of government in the United States or Europe, and all have a wealth of experience representing clients across the full range of antitrust issues. Global Competition Review has repeatedly ranked our practice in the “Top 20 Global Elite” and has distinguished the practice for its “ever-impressive antitrust team.”

Mueller, Thomas

Thomas Mueller

Chair, Antitrust and Competition Practice Group

+1 202 663 6766 (t)


Ranked as one of the leading transatlantic antitrust and competition firms, our recent matters include:

  • Representing Apple, Broadcom, Research in Motion and other industry participants in cases in the United States and throughout the world asserting Sherman Act Section 2 and breach of contract claims arising out of a competitor’s refusal to license patents declared essential to industry standards on fair, reasonable and non-discriminatory (FRAND) terms.
  • Advising leading academic publisher Springer Science+Business Media (SSBM) in securing merger control clearance from the US Department of Justice, the European Commission and several further authorities worldwide for the combination of SSBM with the majority of Holtzbrinck-owned Macmillan Science and Education (namely Nature Publishing Group, Palgrave Macmillan and the global businesses of Macmillan Education) in a joint venture with approximately EUR 1.5 billion in annual revenues.  
  • Representing Cephalon in a prominent action brought by the Federal Trade Commission (FTC) in the US District Court for the Eastern District of Pennsylvania and in separate antitrust actions by putative classes of direct and indirect purchasers of Provigil®, as well as by a would-be generic competitor, Apotex, Inc., all of which challenge Cephalon’s settlement of Hatch-Waxman patent litigation.
  • Representing Intel in FTC Part 3 litigation, where the FTC alleged unlawful monopolization of markets for computer microprocessors and graphics processing.
  • Obtaining US clearance for International Paper’s acquisition of Temple-Inland and obtaining US, German and Chinese clearance for its acquisition of Weyerhauser’s containerboard business.
  • Obtaining first-phase EU clearance for Lufthansa’s sale of British Midland to International Airlines Group, marking the first time that the EU cleared a combination of airlines with hubs at the same airport. Also represented Lufthansa AG in its successful acquisitions of three European air carriers—Brussels Airlines, British Midland and Austrian Airlines.
  • Representing clients in the United States and Europe in response to civil and criminal antitrust probes and class action litigations in the automotive, shipping, financial, rail and natural gas industries, among others.
  • Representing clients in a number of US Supreme Court proceedings, including matters involving the Foreign Trade Antitrust Improvements Act, defense against alleged violations of federal antitrust laws, and class arbitration under the Federal Arbitration Act.

Publications & News


October 19, 2016

Department of Justice Obtains Guilty Plea for Obstruction in Merger Investigation

On October 14, the US Department of Justice's Antitrust Division announced that Ralph Groen, a former information technology executive of the bus operator Coach USA Inc., had pleaded guilty to criminally obstructing justice during a civil antitrust investigation and litigation.

October 3, 2016

SEC Drops Centerpiece Of Case Against WilmerHale Clients

WilmerHale recently achieved a major victory after the US Securities and Exchange Commission (SEC) dropped the centerpiece of its lawsuit against two former mortgage executives.

September 29, 2016

Doryx: Third Circuit Affirms Dismissal of Product Hopping Claim

On September 28, 2016, in Mylan Pharmaceuticals Inc. v. Warner Chilcott Public Limited Co. (Doryx), the Third Circuit affirmed the lower court's grant of summary judgment against antitrust claims by generic manufacturer Mylan regarding branded manufacturer Warner Chilcott's alleged “product hopping” activity with respect to its drug Doryx (delayed-release doxycycline hyclate). 

September 16, 2016

WilmerHale Named Industry's Most Impressive Investigations Practice by GIR

WilmerHale has been named the Most Impressive Investigations Practice of the Year by Global Investigations Review for its cross-border work in both high-profile internal and government-led investigations.

September 15, 2016

Brexit and Competition Law: What to Expect

While we wait for the UK to clarify what sort of relationship it will be seeking with the EU after Brexit, it may be useful to highlight what appear to be the main consequences for the enforcement of competition law.

September 7, 2016

Anti-Monopoly Disputes Are Not Arbitrable According to Chinese Court

On August 29, the Jiangsu Provincial Higher People's Court ruled that an arbitration clause did not apply to an anti-monopoly dispute in a 10 million yuan ($1.5 million) case brought by a distributor against a manufacturer.

August 10, 2016

Civil Penalties Set to Increase Significantly, Many Present Retroactivity Concerns

Over the past several months, many federal agencies have adopted rules significantly increasing the maximum civil monetary penalties (CMPs) they can potentially impose. The increased penalty amounts were adopted in response to recent legislation from Congress requiring that federal agencies make adjustments to “catch up” with inflation.

July 13, 2016

Civil Fines Jump Across Agencies Under Inflation Adjustment Act

Civil fines across federal agencies have recently been increased dramatically under the Federal Civil Penalties Inflation Adjustment Act Improvements Act of 2015 (2015 Act) (Sec. 701 of Public Law 114-74), with some more than doubling. Companies violating the Hart-Scott-Rodino (HSR) Improvements Act, the Securities and Exchange Act, or the Occupational Safety and Health Act (OSHA), among others, could soon face civil monetary penalties that are up to 150% higher than the existing levels. According to the Congressional Budget Office, the 2015 Act would increase the federal government's revenue by $1.3 billion over the next ten years.

July 13, 2016

Kleptocrats in the Crosshairs

In this NYU Law Compliance & Enforcement blog post, Sharon Cohen Levin discusses the US government's crackdown on foreign corrupt money in the United States.

July 12, 2016

WilmerHale Attorneys Fend Off SEC Claims in Fraud Trial

The Recorder discusses the first SEC defeat in 2016, detailing the case led by Heather Tewksbury and Randall Lee.


WilmerHale's Antitrust and Competition Practice has received significant recognition around the globe.

  • Global Competition Review (GCR) ranked WilmerHale among its list of "Top 20 GCR Global Elite" firms for 2015. In addition, the firm was recognized in the 2015 edition of GCR 100,  with "elite" first tier rankings in the Massachusetts and US Government Antitrust categories, and "highly recommended" rankings in the Brussels and Germany categories. In 2014, the practice was recognized by GCR and announced as winner of the "Litigation of the Year Award." Also in 2014, Partner Heather Tewksbury was named Global Competition Review's USA Litigator of the Week.
  • Chambers Global: The World's Leading Lawyers for Business recognized our antitrust practice in Belgium, the United States and globally in 2014, 2015 and 2016. In addition, Steven CherryChristian Duvernoy, Claus-Dieter Ehlermann, Frédéric Louis, Thomas MuellerJohn Ratliff and Heather Tewksbury received individual honors for their work in the field.
  • Chambers USA: America's Leading Lawyers in Business consistently ranks our Antitrust and Cartel Enforcement practices in Massachusetts, Washington DC and nationally. In recent publications, clients have praised the practice's "solid and strategic" work and "responsive, wise and creative" approach, and placed us "at the very top for US law firms in cartel work." Nine of our partners are individually recognized for their work in the field, including Molly Boast, James Burling, Steve Cherry, Mark FordLeon Greenfield, James Lowe, Michelle Miller, Thomas Mueller and Heather Tewksbury.
  • Chambers Europe has recognized our practice as a "well-established practice [that] handles top-end work," including "cartel and private damages litigation, merger control and Article 102 investigations."
  • China Business Law Journal ranks the top law firms in numerous practices and in 2014 ranked WilmerHale under the Competition & Antitrust category. In Beijing, we are recognized specifically for our work advising healthcare providers and payers on the full spectrum of antitrust jurisdictions where they do business.
  • Handelsblatt Best Lawyers named several WilmerHale lawyers from the Berlin and Frankfurt offices as "Best Lawyers" in Germany in the 2013-2016 editions.
  • The Daily Journal selected Partner Heather Tewksbury to its 2014 list of California's "Top Women Lawyers," an annual list compiled to honor and profile exceptional women lawyers who are industry leaders.
  • In the Best Law Firm rankings by U.S. News and Best Lawyers, our antitrust and competition practice was praised as "top notch" and ranked in the first tier nationally and in Boston and Washington DC in 2014, and in the first tier nationally and in Boston, New York and Washington DC in 2015.
  • The annual edition of the Washington DC Super Lawyers magazine, published by The Washington Post Magazine, released its 2014 listing which includes five of our antitrust attorneys.
  • Partners James Burling, James Lowe, Michelle Miller and Thomas Mueller were recognized for their work in the antitrust field, and selected by their peers for inclusion in the 2013 edition of The Best Lawyers in America
  • WilmerHale's German team is consistently ranked among the Top 50 law firms in Berlin and Frankfurt by JUVE Handbook, including the latest 2015/2016 edition
  • In 2014, the Legal 500 launched its new edition of Legal 500 Deutschland, Germany's guide to outstanding lawyers, and recognized WilmerHale in seven categories. In The Legal 500 United States 2013 the firm's antitrust practice was recognized. Clients cited us as a "top-notch" team that is "excellent at driving clients' desired outcomes." Further, the guide individually recommends co-chairs Thomas Mueller and "outstanding adviser" Michelle Miller, as well as Partner Eric Mahr whom clients praise for his "practical advice and knowledge of the 'ins and outs' of government agencies."  
  • In 2013, our group was recognized by Acquisition International as "Antitrust Litigation Law Firm of the Year" in California and "Antitrust Litigation Legal Practice of the Year" in Washington DC.
  • In 2012, Practical Law Company (PLC) ranked WilmerHale as a leading law firm in the area of antitrust and competition in Boston, and recommended the firm nationally and in Washington DC. Internationally, the firm was recommended in Belgium and Germany. In addition, 13 WilmerHale partners were selected as "Leading Lawyers."
  • In 2012, WilmerHale was also recognized in PLC's Competition Super League, a directory highlighting "the best global competition teams from around the world."
  • WilmerHale is a multi-year recipient of the Law360 "Competition Groups of the Year." In 2011, the practice was noted for "steering controversial transactions through merger reviews" and "recording big wins for major corporations in civil antitrust suits."