The parties involved did not challenge the Tribunal's personal jurisdiction but focused on the lack of subject matter jurisdiction by the Commission regarding the fourth respondent. This respondent contended that the Commission failed to present facts establishing that its involvement in a collusive conduct was linked to its Johannesburg branch or its role as an authorized dealer in South Africa. Specifically, the Commission cited two individuals, Akshay Aiyer and Paul Simister, as evidence of the fourth respondent's participation in the alleged collusion, yet did not demonstrate that they worked for the Johannesburg branch or were acting on its behalf.
In contrast, for the third respondent, the Commission was able to establish both personal and subject matter jurisdiction. Aiyer, employed by the third respondent, was convicted in the U.S. for price-fixing, and there was ample evidence of his active participation in chatrooms related to the alleged collusion, especially with other traders. His frequent involvement provides a prima facie basis that suggests the third respondent participated in the alleged collusive conduct, whereas the same cannot be established for the fourth respondent.