In the last decadeamicusintervention has become increasingly prevalentin investor-state arbitration. As part of a generalized drive towards transparency,amicusbriefs are now routinely submitted in high-profile investor-state arbitrations,which are closely related to public interest issues.Philip Morris v. Uruguayis anotable example of such arbitrations. However, it is often argued thatamicussubmissions are hardly relevant to investor-state tribunals’ analyses. By firstshedding light on the conditions governing the acceptance ofamicusbriefs, thisarticle looks at how thePhilip Morristribunal admitted such briefs and whether theywere at all relevant to the tribunal’s analysis. It thereafter questions the extent towhich such relevance may be linked to the tribunal’s find

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• AmicusAcceptance and Relevance: The DistinctiveExample ofPhilip Morris v. Urugua