Sheppard, Mullin, Richter & Hampton LLP

Antitrust Department

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Antitrust law has been a premier practice for decades at Sheppard Mullin, as one of the firm’s name partners co-founded the ABA’s Antitrust Section. That tradition continues today with our highly ranked global antitrust and competition practice, including more than 50 competition lawyers in California, Washington D.C., Brussels, London, Seoul and Shanghai.

The group regularly handles investigations by the U.S. DOJ, the FTC, State AG’s and international enforcement officials. In the U.S., our lawyers counsel clients and handle litigation involving the federal Sherman, Clayton and Robinson-Patman Acts, and state antitrust statutes including California’s Cartwright Act, Unfair Practices Act and Unfair Competition Act. Internationally, we advise on EU competition law and state aid, UK and EU member states’ antitrust and regulatory matters, and China’s Anti-Monopoly law.


  • Top tier international price-fixing cartel expertise, including criminal governmental defense, MDL direct and indirect class cases, and major private opt-out actions
  • ​Cutting edge IP/ patent anti-trust experience relating to standard setting, patent pooling, product distribution and licensing restraints, joint ventures and competitor collaborations
  • Extensive direct and indirect purchaser class action litigation experience, government investigations and merger clearance
  • Merger and structuring issues, joint ventures and other competitor collaborations
  • Antitrust audits and antitrust compliance programs


Derenne, Jacques (Head of Department)

Scarborough, Michael (Head of Department)

Ballard, Dylan

Caseria, Leo

Cohen, Michael P.A.

Dillickrath, Thomas

Garcia, David

Halling, Gary L

Heinisch, Oliver

Klotz, Robert

Magielnicki, Robert

McGinnis, James

Moon, Yookyung

Newman, Bevin


AGI Publishing, Fresno, California

MasterCard, Purchase, New York

Reynolds & Reynolds, Kettering, Ohio

Samsung, Seoul, Korea

TaylorMade, Carlsbad, California


Automobiles and Parts

Food and Drink Producers



Technology, Hardware & Electronics