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Host states are not the only sovereign parties that an investment dispute can impact. The sovereign interests of an investor’s home state are also potentially affected by an investment claim initiated by a national against an investment treaty partner, and more mechanisms should be put in place to ensure that the home state has access to the arbitration proceedings. This chapter argues for non-disputing state party participation as a matter of right in investment treaty arbitration cases. Whether or not the home state of the investor is informed of and allowed to participate in an investment dispute has largely been left to the discretion of arbitral tribunals; arbitration rules and jurisprudence have regarded the home state no differently than non-governmental third parties seeking to participate in the arbitration as  amici curiae . From the perspective of increased transparency in the investor-state dispute settlement system, this chapter posits that non-disputing state parties must be accorded an elevated status in investor-state arbitration, with the following rights: first, to be formally notified at the outset about an investment treaty dispute; second, to have access to the documents of the arbitration case; and, third, to make written submissions with respect to the interpretation of the international investment agreement invoked in the claim. The analysis begins by identifying the sovereign interests of the home state that come into play in an investment treaty arbitration. The perils of diplomatic protection are examined in this chapter, to provide the perspective from which to delimit the parameters for non-disputing state party participation. A survey of arbitration rules and jurisprudence outlines the level of participation thus far accorded to home states in investment treaty arbitration.

Not a Third Party: Home State Participation As a Matter of Right in Investment Treaty Arbitration