Extraterritoriality refers to the application of a nation’s law to persons, conduct, or property outside its own territory. Customary international law allows nations to regulate extraterritorially on a number of different bases, including effects, nationality, and universal jurisdiction. Nations generally limit the extraterritorial application of their laws to a greater extent than customary international law requires. For example, the United States applies a presumption against extraterritoriality to federal law and sometimes imposes additional limitations as a matter of prescriptive comity. Some U.S. states have their own presumptions against extraterritoriality, which may differ from the federal presumption.
A Primer on Extraterritoriality
[Updated September 1, 2025] Extraterritoriality refers to the application of a state’s law beyond the state’s borders. Although the word “extraterritorial” often has negative connotations, international law permits a great deal of extraterritorial regulation. In a world where trade, information, crime, and lots of other things regularly cross borders, states often have an interest in…
Continue ReadingEnforcing U.S. Judgments Against “Foreign” Assets of Foreign Sovereigns: a Rejoinder
On June 30, 2025, in Petersen Energia Inversora, S.A.U. v. Argentine Republic, a federal district court in New York ordered the Republic of Argentina to “(i) transfer its Class D shares of YPF to a global custody account at BNYM in New York within 14 days from the date of this order; and (ii) instruct…
Continue ReadingNinth Circuit Validates a Theory of Extraterritorial Antitrust Regulation in Global Price-Fixing Case
It is not easy for the foreign victims of global price-fixing schemes to assert viable claims under U.S. antitrust law, even when the conspiracy in question also affects U.S. markets. In a recent case, though, the Ninth Circuit vacated an order of summary judgment against the foreign purchasers of price-fixed goods, concluding that they had…
Continue ReadingExtraterritoriality in Flux
Earlier this month, at the annual meeting of the Association of American Law Schools, TLB Editors Maggie Gardner, Bill Dodge, and Hannah Buxbaum participated in a panel organized by the Section on Conflicts of Law entitled “Extraterritoriality in Flux.” This post summarizes their remarks. Maggie Gardner: It’s Time to Look Beyond the Presumption Against Extraterritoriality…
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