Print PDF


Our antitrust roots run deep. One of our name partners, Gordon Hampton, was a founder of the American Bar Association’s Antitrust Section in the 1950s and he helped forge a premier California antitrust practice that continues more than sixty years later. From there, we expanded our practice in parallel with the expansion of antitrust law itself—first into a national presence with the addition of our antitrust teams in Washington, D.C. and New York and then into a global force with established competition practices in Brussels, London and Seoul. The result is a practice that is international in every sense of the word, specifically designed to meet the realities of modern antitrust and competition enforcement, where a competition issue in one jurisdiction often cascades into other jurisdictions around the globe.

Today, our group is composed of lawyers who do nothing but practice antitrust and competition law. The team, part of the firm’s Governmental Practice, includes former high-ranking officials and trial lawyers from the U.S. Department of Justice, U.S. Federal Trade Commission, and the European Commission’s Directorate General for Competition. Together under one umbrella, we all work together seamlessly, handling matters on behalf of a diverse array of clients throughout the United States, Europe, and Asia.

Regardless of where we call home, we share a common ethic: we are practical lawyers who believe we should do the things that actually make a difference in achieving our client’s goals. That ethic, combined with the breadth and depth of our experience, has enabled us to successfully resolve extremely complicated antitrust matters with teams that are lean and efficient.

Some highlights of our antitrust and competition practice include:


We regularly litigate some of the largest and most complex antitrust cases in the U.S., from federal multi-district class actions to civil litigation between competitors, suppliers, and purchasers. Our attorneys have taken antitrust cases to trial and appeal. We have successfully resolved antitrust litigation matters for clients in a broad range of industries, including consumer electronics, software, cement and concrete, and grocery. We also have deep experience with litigation arising under state antitrust and competition laws, including below-cost pricing, consumer protection, and unfair competition statutes. In the EU, our lawyers have an impressive track record of pleading competition cases before EU courts and the national courts of the Member States, challenging decisions taken by the European Commission and national competition authorities. They also regularly appear before national courts when EU law issues are at stake (in competition matters and beyond) and before the Court of Justice of the European Union in procedures referred by national courts.

Merger Clearance

Our lawyers have experience with all phases of U.S. merger review, including HSR filings, pull-and-refiles, second requests, as well as litigation and trial. We also navigate the merger review and approval process in other countries around the globe, and our merger clearance team assists multinational clients in crafting strategies and coordinating merger proceedings across multiple jurisdictions. Our lawyers have successfully represented clients in numerous high-stakes mergers, including General Electric’s $10 billion acquisition of Alstom’s energy business in the EU and U.S. to VillageMD’s $8.9 billion acquisition of Summit Health-CityMD, among many others. In recent years, healthcare-related transactions have become a core component of our U.S. merger practice, and we routinely represent hospitals, doctors, insurance companies, and strategic venture capital and private equity buyers and sellers in such transactions.


Cartel defense work has been a pillar of our practice for decades. We were at the forefront of the explosion in international cartel cases beginning in the 1990s and have remained a leading cartel practice ever since. Today our group is at the forefront of new and emerging trends in criminal antitrust enforcement, including representation of clients in no-poach or wage-fixing matters.  Our group includes some of the most experienced and accomplished cartel defense lawyers in the world, working in every phase of cartel defense, from government investigations, to criminal prosecutions and enforcement actions against businesses and individuals, through the resolution of civil class actions and other private litigation. In the U.S., we have successfully represented key defendants in government investigations, criminal prosecutions, and private class actions involving LCD panels, DRAM and SRAM memory chips, auto parts, cathode ray tubes, and Lithium ion batteries, among other products. In the EU, we have successfully represented clients in cartel investigations involving air cargo services, gas-insulated switchgear, power transformers, and many other areas. Compliance is also at the forefront of our client offerings.

EU State Aid

We have an elite EU State aid practice, headed by lawyers with more than three decades of experience. We assist Member States, beneficiaries, and competitors with every type of State aid issue. We also tailor aid measures to ensure clearance from the European Commission and have authored innovative legal analyses that have led the European Commission to adjust its formal State aid enforcement policies. The Alstom restructuring case is one of our landmark cases before the European Commission. Our lawyers have also been involved in landmark State aid litigation, both before national and EU courts, that has helped shape the development of applicable EU law, including the Chronopost case on behalf of DHL and FedEx—the first action against a beneficiary of unlawful State aid—and the GB capacity mechanism case on behalf of Tempus Energy—the first annulment of an EU ’s approval of a capacity mechanism.

Standard-Essential Patents (SEPs)/FRAND

We have a renowned practice in the area of increasing overlap between antitrust and intellectual property laws, and our lawyers are on the cutting-edge of antitrust issues arising from the use and licensing of standard-essential patents (SEPs). We recently achieved a complete dismissal of all claims in an antitrust case challenging the legal viability of one of the world’s largest defensive patent aggregators and we recently represented Samsung Electronics in global patent and standards-related governmental and private antitrust actions involving Qualcomm, Apple, and Ericsson.

Big Tech and Antitrust

With ever-increasing focus on Big Tech by U.S. federal and state antitrust enforcement agencies, Sheppard Mullin’s antitrust team is well positioned to help our clients—whether as an interested third-party or an investigatory target—respond to inquiries from these agencies and, if necessary, manage involvement in related litigation. The rise and alleged dominance of Big Tech companies has led to unprecedented concerns about whether antitrust laws and enforcement policies address modern competitive issues, or whether significant changes are required. The DOJ, FTC, State AG’s and private enforcers have taken aim, pursuing novel and aggressive strategies against Big Tech companies. Because interacting with these tech giants is a practical and existential necessity for most companies, many may find themselves caught in the cross-fire. We can help companies navigate this new frontier of antitrust enforcement and scrutiny.

EU Regulatory

Our EU lawyers guide clients navigating EU legislation in a number of sectors, including energy, transportation (rail, aviation, road, maritime), telecommunications and satellite, food and beverage, postal services and logistics, life sciences and pharmaceuticals, electronic devices, medical devices, construction, tax, financial services, retail, and consumer products, among others. Our team also develops advocacy opinions on proposed EU legislation in many sectors before the European Parliament or other EU institutions, including the European Commission and the Council of Ministers.



Podcasts & Webinars








Jump to Page

By scrolling this page, clicking a link or continuing to browse our website, you consent to our use of cookies as described in our Cookie and Advertising Policy. If you do not wish to accept cookies from our website, or would like to stop cookies being stored on your device in the future, you can find out more and adjust your preferences here.