Antitrust Litigation_2026

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

The Clayton Act allows litigants to pursue damages claims that follow on from parallel scrutiny by federal law enforcement and standalone claims. Standalone claims brought by private litigants in the absence of any governmental action against the defendants are common in US practice. News that antitrust authori - ties are investigating potential anti-competitive con - duct commonly prompts private litigants to quickly initiate parallel damages actions, usually while the underlying investigation remains pending. 2.2 Courts Most federal competition matters are resolved in the US federal courts, which have exclusive jurisdiction over federal antitrust claims. An exception is the administrative adjudicatory process carried out by the FTC (see 2.3 Impact of Competition Authorities ). The Clayton Act accords plaintiffs wide latitude in choos - ing a venue (that is, the US federal district court in which they file suit). Venue is proper under the Clay - ton Act in any federal district where the defendant “resides or is found or has an agent”, or “transacts business” (15 USC Sections 15[a], 22). The parties may request, or the court may on its own decide, “for the convenience of parties and witness - es” or “in the interest of justice”, to transfer a federal antitrust litigation to a different federal district where the case “might have been brought” or to any district to which “all parties have consented” (28 USC Sec - tion 1404[a]). Different claimants may file parallel antitrust com - plaints in differing federal districts. When this occurs, the parties may request that the Judicial Panel on Multidistrict Litigation consolidate claims involving “common questions of fact” into a single federal dis - trict for co-ordinated pretrial proceedings (28 USC Section 1407[a]). Antitrust claims made under state law may also be heard in federal court if: • they supplement a federal claim (28 USC Section 1367); • the parties reside in different jurisdictions (28 USC Section 1332[a]); or

• they meet the requirements of the Class Action Fairness Act of 2005, which significantly expanded the federal courts’ authority to resolve large class actions even if pursued under state law (28 USC Section 1332[d]). 2.3 Impact of Competition Authorities The federal antitrust enforcement agencies exer - cise independent judgement over which matters to litigate, but their enforcement actions are subject to judicial review in some form. The FTC, as an inde - pendent administrative agency, possesses the statu - tory authority to adjudicate civil claims of “unfair com - petition” before the agency’s own administrative law judges in trial-type proceedings. Decisions by FTC administrative judges are automatically reviewed by the FTC commissioners, and a losing defendant may appeal the Commission’s decision to the federal appellate courts. By contrast, the US Department of Justice, Antitrust Division (the “Division”), as a law enforcement agency, lacks the authority to adjudicate its own disputes, and instead must pursue enforcement actions exclusively in the federal courts. The courts likewise retain over - sight of Division settlements of these cases before tri - al. When the Division concludes a civil antitrust inves - tigation or litigation by settlement (known as a consent decree), the Antitrust Procedures and Penalties Act obliges the Division to file a complaint and proposed settlement materials in federal court and to seek judi - cial approval of the settlement’s terms. However, the court’s review is limited to ensuring that the settlement is in the “public interest” (15 USC Section 16). In comparison, a criminal antitrust prosecution – which, as a matter of policy, the Division uses to tar - get only “hardcore” per se competition offences – is overseen in its initial stages by a federal grand jury, which decides whether there is “probable cause” to believe a crime was committed, justifying the issuance of an indictment. In general, criminal antitrust defend - ants often plead guilty rather than stand trial. In that circumstance, the trial court has discretion to accept or reject the Division’s recommended sentence.

246 A NTITRUST LI T IGATI O N 2026

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