In 2019, the United States (‘U.S.’) made six non-disputing Party submissions in investment treaty arbitrations, three of which took place under the NAFTA (Lion Mexico Consol. L.P. v. Mexico; Vento Motorcycles, Inc. v. Mexico; and Tennant Energy, LLC v. Canada), and one each of which took place under U.S. agreements with Korea, Peru and Panama (Jin Hae…

The controversial role of non-disputing parties has been the object of a significant amount of literature. While third party funding was a hot topic hitherto, the so-called amicus curia, and its evolving role, might be back in the spotlight. Since the first ICSID amicus case -the Bechtel case- until today, the rights, interests at stake…