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With the upsurge in the complexity of international commercial transactions, which often involve multiple contracts, parties, jurisdictions and third parties, international arbitration has witnessed a growing pressure by its users for it to develop increasingly appropriate mechanisms in response to the disputes emerging from such transactions.

One of these mechanisms is precisely the joinder of third parties, which is, broadly speaking, triggered when a third party, at its own initiative or at the request of a party to the arbitration, is authorized to participate within a pending arbitration.

In the context of proceedings taking place in national state courts, the existence of joinder mechanisms is common and well defined within the procedural law applicable, whereby the main characterizing features are (i) that the participation of a third party does not require the consent of all the parties involved, and (ii) that the court has significant discretion for ordering joinder of third parties. 

Underlying these mechanisms in the state jurisdiction are reasons of efficiency and procedural economy, but also, above all, these mechanisms aim to avoid the risk of inconsistent or contradictory decisions arising from the existence of two or more separate proceedings discussing the same or related issues involving different parties. Essentially, its purpose is for the state court to be able to hand down a decision that definitively regulates the specific situation of all those interested (parties and/or third parties) relating to the subject matter in dispute.

These reasons would also be welcome to international arbitration. However, in international arbitration the availability and scope of these mechanisms is far more limited, first and foremost, due to the different nature of the powers underlying the state and arbitration jurisdictions.

In fact, in state jurisdiction, the court is vested with ius imperii and it is a sovereign body, previously established and regulated. In contrast, in arbitration the legitimacy of the arbitral tribunal is based on the parties’ consent, expressed within the arbitration agreement, deciding to submit certain disputes to the decision of arbitrators they have chosen or which were chosen following previously agreed rules.

The consensual nature of arbitration is so striking that the idea of having third parties intervening in a pending procedure without their consent and/or without the consent of the parties thereof immediately appears to be in conflict with this structural principle of party autonomy inherent to arbitration.

In addition, the joinder of third parties in arbitration brings to light certain issues that may prove to be difficult to solve, such as those related to confidentiality, arbitrators’ appointment or certain concerns relating to an increase of the complexity, length and costs of the arbitration along with a potential increased risk of the arbitral award being challenged.

Most national legislations on arbitration do not establish mechanisms for joinder of third parties, which is also the case of the UNCITRAL Model Law (contrarily to what occurs with the UNCITRAL Arbitration Rules, applicable to ad hoc arbitrations). However, there are some exceptions, such as the Portuguese Law, the Dutch Law, the Belgian Code Judiciaire and the Italian Law, which expressly regulate joinder of third parties in arbitration proceedings.

In the Portuguese case, the Voluntary Arbitration Law, approved by Law nº 63/2011, of December 14^th, establishes a supplementary regulation of this mechanism, which can be regulated differently by the agreement of the parties, either directly, observing the principle of the equality of participation of all parties when choosing the arbitrators, or by referring to the arbitration rules of an international arbitration institution that foresees joinder of third parties.

The (supplementary) regulation of Portuguese law contains the following main aspects:

• It requires the consent of all parties to the arbitration agreement on the joinder of a third party in pending arbitration proceedings;
• If the joinder takes place after the constitution of the arbitral tribunal, the third party must expressly declare its acceptance of the current composition of the arbitral tribunal;
• The admission of joinder always depends on the decision of the arbitral tribunal, after hearing the initial parties to the arbitration and the third party involved. A joinder may only be allowed if it does not unduly interrupt the normal course of proceedings and there are relevant grounds (which are listed) justifying it;
• Notwithstanding what the parties might have established in this respect, any joinder prior to the constitution of the arbitral tribunal can only take place in institutional arbitration and insofar as the applicable arbitral rules ensures the observance of the principle of equality of participation of all the parties, including members of multi-parties, when appointing the arbitrators.

In an attempt to address the pressure exercised by international arbitration users and to which we referred at the beginning of this article, some leading arbitral institutions have been introducing into their Arbitration Rules mechanisms allowing a joinder, with differing degrees of flexibility amongst them. Such is the case of the International Chamber of Commerce (ICC), the London Court of International Arbitration (LCIA), the Swiss Chambers’ Arbitration Institution (SCAI), the Singapore International Arbitration Centre (SIAC) and the Vienna International Arbitration Centre (VIAC). From a Portuguese perspective, the Arbitration Rules of the Commercial Arbitration Centre of the Portuguese Chamber of Commerce and Industry (CAC) are of note.

Thus, when facing complex multi-contract and multi-party international transactions, as is typically the case of M&A transactions or infrastructure construction projects, particular care must be given to the wording of the dispute resolution clause and to the choice of arbitration rules as it may prove to be useful to include provisions making third-party intervention more flexible.