Antitrust Litigation 2025

USA Law and Practice Contributed by: Robert Houck, William Lavery, Joseph Ostoyich and Leigh Oliver, Clifford Chance US

Clifford Chance US is recognised for its team of highly skilled professionals who have decades of knowledge advising clients on a broad range of do - mestic and cross-border matters, including mergers, joint ventures, civil and criminal investigations, class action litigation, compliance, and wider antitrust and regulatory issues. The firm’s lawyers draw on exten -

sive insight gained from both leading private practice and senior government roles, positioning them as trusted advisers on complex and innovative matters. Clifford Chance US forms an integral part of a global antitrust practice comprising more than 200 lawyers across the Americas, Europe, the Middle East and Asia Pacific.

Authors

Robert Houck is the head of the US litigation and dispute resolution group at Clifford Chance in New York, NY. Robert represents clients in government investigations and complex commercial litigation, with a

Antitrust Litigation, affirmed by the Seventh Circuit. His track record has earned consistent recognition as a leading antitrust practitioner in prominent national rankings.

Joseph Ostoyich is the head of the US antitrust litigation practice at Clifford Chance in Washington, DC. He has been lead counsel in dozens of “bet-the-company” class action and individual price fixing,

specific focus on cross-border matters. He has experience in antitrust matters in complex trading markets, and has represented corporations and individuals in connection with regulatory investigations before the Commodity Futures Trading Commission, the US Department of Justice, the Securities and Exchange Commission, the New York Stock Exchange, various state attorneys general and numerous non-US regulators. Robert has extensive experience representing companies, underwriters, corporate officers and outside directors in class actions. of the firm’s US antitrust litigation group. An accomplished trial lawyer with 20 years of antitrust litigation experience, Will specialises in high-stakes civil and criminal antitrust matters and government investigations, regularly representing clients before the US Department of Justice, Antitrust Division, the Federal Trade Commission and federal courts nationwide. Many of the world’s largest companies rely on his strategic guidance in complex “bet-the- company” litigation, investigations and merger challenges. Notably, Will secured a rare motion-to- dismiss victory in In re Humira (Adalimumab) William Lavery is the managing partner of Clifford Chance in the Washington, DC office and a member

monopolisation, merger challenges and other antitrust matters, and his trial prowess has earned him recognition for “excellence among American litigation and trial counsel”. Joe is a Fellow of the invitation-only Litigation Counsel of America, a trial lawyer honour society limited to 3,500 lawyers (<0.5%) nationwide. He has repeatedly received high rankings from Chambers and Partners and other publications.

Leigh Oliver is a partner in the antitrust group at Clifford Chance in Washington, DC. She is head of the US antitrust group and co-head of the global healthcare and life sciences sector at Clifford Chance. Leigh

advises on antitrust issues ranging from transformational mergers and acquisitions to state and federal antitrust investigations. She has two decades of experience advising clients in heavily scrutinised industries, including healthcare, life sciences, aerospace and defence, and industrials. Leigh regularly represents clients in merger litigation in federal court.

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