Based in Washington, DC, Clifford Chance has defended clients across a broad range of high-stakes antitrust matters, achieving strong outcomes at every stage of proceedings, including early dismissals, summary judgment wins, opt-out federal litigation, and trial-level victories. The practice is led by William Lavery, a trial lawyer with two decades of focus on antitrust litigation and government investigations, particularly in the pharmaceutical and healthcare sectors. Joseph Ostoyich heads the US antitrust litigation practice and the firm’s global class actions group, bringing more than 30 years' experience of advising major corporations in antitrust disputes.
Legal 500 Editorial commentary

Key clients

  • Caterpillar
  • Energy Transfer LP
  • Paccar Inc.
  • Mount Nittany Health System
  • Merck & Co., Inc.
  • ICBC Standard Bank Plc
  • Weill Cornell
  • Global Disinformation Index

Work highlights

Obtained defense jury verdict as lead trial counsel in favor of Caterpillar Inc., the world’s leading manufacturer of construction and mining equipment, off-highway diesel and natural gas engines, industrial gas turbines and diesel-electric locomotives, in a lawsuit alleging the company conspired with a competitor and its own dealers to boycott the distributor of a foreign supplier seeking to enter the United States.
Obtained dismissal of case against Energy Transfer L.P., one of North America's largest and most diversified midstream energy companies, alleging company conspired with major U.S. oil producers, refiners and industry-wide trade association to reduce the supply of crude oil and raise gasoline prices, which was affirmed on appeal by the Ninth Circuit.
Representation of PACCAR Inc. in multiple related litigation and investigation matters that center around allegations the company conspired with its primary competitors and the Truck and Engine Manufacturers Association to reduce the output of, and ultimately phase out, traditional internal combustion engine trucks and to force customers to buy electric trucks in compliance with zero-emissions standards set by the California Air Resources Board.
Practice head

Joseph Ostoyich; William Lavery