Executive Summary: Key Legal and Evidentiary Issues

• Interplay between Quebec’s lis pendens rules and national multi-jurisdictional class actions in determining whether to stay a Quebec proceeding.
• Application of article 3137 C.C.Q. and article 3155(4) C.C.Q. to decide if a Quebec class action may be stayed in favour of an earlier-filed British Columbia class action involving the same proposed class and issues.
• Use of the court’s inherent jurisdiction under article 49 C.C.P. to stay a Quebec class action even where strict identity requirements for lis pendens are flexible in the class action context.
• Protection of Quebec class members’ rights, including representation, access to favourable Quebec legislation, and French-language notices and communications when another province leads the national proceeding.
• Consideration of judicial economy and avoidance of conflicting judgments where parallel class actions in different provinces raise the same issues against the same defendant.
• Weight accorded to the consent of the Quebec applicant and inter-provincial cooperation between class counsel in managing overlapping class proceedings.

Background and facts of the case

This case arises from overlapping proposed class actions brought against Nvidia Corporation in Canada. In Quebec, Taras Grescoe filed an Application for Authorization to Institute a Class Action and to Obtain the Status of Representative on July 30, 2025 (the Quebec Class Action), in the Superior Court, Class Action Chamber, Montreal district. At the national level, a prior proposed class action had already been commenced in British Columbia: James Bernard MacKinnon v. Nvidia Corporation, court file S-255561, before the Supreme Court of British Columbia (the B.C. Class Action). The Quebec application sought to proceed on behalf of a putative class of Quebec residents, while the B.C. proceeding was framed as a national class action that also encompassed Quebec members. Although the decision does not describe the underlying substantive allegations (for example, whether they relate to consumer protection, securities, or competition law), it is clear that the Quebec and B.C. proceedings targeted the same defendant, Nvidia Corporation, on behalf of overlapping groups of class members and based on the same alleged facts. In the Quebec proceeding, Nvidia Corporation did not contest the specific motion at issue. Instead, it took no position on the stay application while expressly reserving all rights to defend the Quebec Class Action in the future, including contesting the Superior Court’s jurisdiction.

Procedural posture and the stay application

The decision concerns a procedural motion brought by the Quebec applicant, Taras Grescoe, asking the Superior Court to temporarily stay the Quebec Class Action. The requested stay was to last until final judgment in the B.C. Class Action or until otherwise ordered by the Quebec court on further request by the parties. The central question was whether, in light of a prior-filed and overlapping Canadian class action, the Quebec court should suspend its own authorization proceedings and effectively allow the national B.C. case to take the lead. The court approached this question by examining both the codified private international law rules in the Civil Code of Québec and the court’s own inherent powers under the Code of Civil Procedure, specifically as they operate in the specialized context of class actions.

Legal framework: lis pendens and recognition of foreign judgments

The court first turned to article 3137 of the Civil Code of Québec (C.C.Q.), which allows a Quebec court to stay proceedings if another action, between the same parties, based on the same facts and having the same subject, is already pending before a foreign authority, provided that the foreign proceeding can lead to a judgment that may be recognized in Quebec. Article 3155(4) C.C.Q. complements this by limiting recognition of foreign judgments when a similar action is pending in Quebec and the Quebec court was first seized of the dispute. Read together, these provisions mean that a Quebec action can only be stayed under article 3137 C.C.Q. if the foreign (in this context, extra-provincial) action was commenced earlier in time. The court also referred to Court of Appeal guidance that traditional lis pendens rules “do not apply neatly” to class action authorization motions. For instance, strict identity of parties is relaxed: even where proposed representatives differ, identity can still be found when the proposed classes are materially similar. In this class action context, Quebec courts have developed a working set of criteria for stays in favour of other Canadian class actions. A Quebec motion to authorize a class action will generally be stayed under article 3137 C.C.Q. when four elements are present: the motions are directed against the same defendants, the Quebec proposed class is included within the foreign (here, B.C.) class, both motions rest on the same facts and seek the same object and causes of action, and the foreign certification motion was filed first.

Inherent jurisdiction and the interests of justice

The court emphasized that even if the technical conditions of article 3137 C.C.Q. are not fully satisfied—for example, if the Quebec application were filed before the foreign action—the Superior Court retains the power under article 49 of the Code of Civil Procedure (C.C.P.) to stay a class action. This inherent jurisdiction can be exercised whenever the interests of Quebec members and the proper administration of justice support a suspension. In multi-jurisdictional class action settings, Quebec courts have recognized that it will generally not serve justice, the parties, or judicial efficiency to allow two overlapping class actions to proceed in parallel before different courts. Running parallel actions creates a real risk of inconsistent or conflicting judgments, increases costs for parties on all sides, and strains limited judicial resources. The court also noted that another relevant consideration is whether one of the class actions covers issues, remedies, or groups of class members that are not captured in the other. If the foreign proceeding is broader or otherwise better suited to resolve the shared dispute, that weighs in favour of a temporary stay of the Quebec file.

Protection of Quebec class members’ rights

A crucial theme in the court’s reasoning is that when a Quebec application to authorize a class action is stayed in favour of another Canadian proceeding, the Quebec court must still safeguard the substantive and procedural rights of Quebec residents in the putative class. Among other obligations, the court must ensure that the proposed representative in the other jurisdiction is genuinely positioned to represent Quebec members’ interests. It must also be satisfied that Quebec residents will enjoy the benefits of any favourable Quebec legislation that may apply to their claims. In addition, formal requirements around language and communication must be respected: notices, important communications, and significant documents must be disseminated in Quebec and in French so that Quebec members can meaningfully participate in or respond to developments in the national class proceeding.

Application of the criteria to the Nvidia class actions

Against this legal and policy background, the court found that the conditions to grant a stay were satisfied in this case. The B.C. Class Action was filed on July 24, 2025, several days before the Quebec Class Action was instituted on July 30, 2025, meaning the foreign proceeding was first in time. The B.C. case raises the same issues and includes the same group of members as the Quebec application. There was no indication that the Quebec filing captured distinct issues, remedies, or members that fell outside the scope of the B.C. proceeding. The purpose of the requested suspension was to avoid the risk of contradictory judgments and to promote sound and efficient use of judicial resources while still protecting the interests of Quebec residents in the putative class. The court found that this objective aligned with both the codified lis pendens framework and the broader principles governing multi-jurisdictional class actions. The rights and interests of Quebec members were, in the court’s view, adequately protected for several reasons. First, the causes of action pleaded in the B.C. Class Action include all the causes advanced in the Quebec Class Action, so proceeding in B.C. does not leave Quebec residents without any avenue for the claims brought on their behalf. Second, counsel involved for the applicant in both provinces had agreed to cooperate to ensure efficient conduct and proper coordination between the Quebec and B.C. class actions. Third, class counsel in the B.C. proceeding confirmed that they have bilingual (French/English) lawyers and paralegals available to respond to questions from Quebec putative class members, and that they will see to it that all notices and important communications or documents are made available in French. Fourth, the Quebec action itself had not progressed substantively since its filing; no procedural steps had been taken apart from the present stay application, which reduced the risk that any work or rulings in Quebec would be wasted by the suspension.

Ongoing reporting obligations to the Quebec court

Another safeguard imposed by the court was an ongoing reporting obligation. The applicant undertook to provide the Quebec Superior Court with semi-annual status updates on the B.C. Class Action. In addition, the applicant must notify the Quebec court within 30 days of any significant development in the B.C. proceeding that may affect the path of the Quebec Class Action. This includes providing copies of any judgments rendered in the B.C. Class Action. The court accepted this undertaking and ordered the parties to comply. In doing so, the Quebec court preserved oversight over the implications of the B.C. litigation for Quebec residents and retained the ability to revisit or adjust the stay if circumstances changed.

Decision, successful party, and absence of monetary award

In its operative conclusion, the Superior Court granted the Application to Temporarily Stay the Quebec Class Action and formally stayed the Quebec proceeding until final judgment is rendered in the B.C. Class Action or until an earlier time if later requested by the parties or ordered by the court. The court also recorded (“prays act”) the commitment of B.C. class counsel to provide French-language notices and communications to Quebec class members and the applicant’s undertaking to furnish regular updates on the British Columbia litigation. The judgment was rendered without a hearing and expressly without legal costs. As a result, the successful party on this motion is the applicant, Taras Grescoe, whose request for a stay was fully granted. The court did not order any damages, costs, or other monetary relief; no compensation or cost award was quantified or granted in favour of any party in this decision, and therefore the total monetary amount ordered is nil or cannot be otherwise determined from this judgment.