McLachlan v Australian Stock Exchange Ltd No. Scgrg-98-1507 Judgment No. S284

The appeal in McLachlan v Australian Stock Exchange Ltd [1999] SASC 284 was heard by Olsson, Mullighan, and Nyland JJ. The appellant, Mr. McLachlan, sought an injunction to prevent the respondent, the Australian Stock Exchange (ASX), from pursuing disciplinary charges against him. The case was dismissed by the learned trial judge, and the appellant now appealed that decision. The primary issues before the court were whether the ASX acted unreasonably in refusing to accept Mr. McLachlan's surrender of his status as an affiliate and whether the National Adjudicatory Tribunal (NAT) had jurisdiction to continue to hear the charges laid against him.

The court considered the arguments put forward by both parties, examining the situation before and after the ASX's change of status on October 13, 1998. The court found that the ASX's decision not to accept Mr. McLachlan's surrender of his status as an affiliate was not unreasonable, as it was based on proper considerations related to the proper enforcement of contractual rights and processes. The court also concluded that the transitional provisions in the ASX's Constitution and new Business Rules ensured that the NAT's jurisdiction to hear and determine disciplinary charges continued after the change of status. The appeal was dismissed by all three judges, agreeing with the reasoning provided by Olsson J.