Caason Investments Pty Ltd v Cao

The case of Caason Investments Pty Ltd v Cao involved an appeal against a decision by the primary judge to refuse the appellants leave to amend their statement of claim in relation to market-based causation claims. The appeal was heard in the Federal Court of Australia, and the respondents conceded that any reliance restriction must be a matter independent of causation. The appellants sought to amend their statement of claim to bring claims based on misleading or deceptive conduct and contravention of certain sections of the Corporations Act, Australian Securities and Investments Commission Act, and Fair Trading Act. The primary judge rejected the proposed amendments, but the Court of Appeal found that the primary judge ought not to have refused to grant leave to make the amendments.

The primary legal issue before the Court of Appeal was whether the primary judge erred in rejecting the proposed amendments to reflect a market-based causation case. The Court of Appeal found that the primary judge had accepted that the market-based causation case had reasonable prospects of success, and that the issue of whether market-based causation was established as a matter of fact would require expert evidence. The Court of Appeal also found that the respondents had conceded that any reliance restriction must be a matter independent of causation, which meant that the market-based causation case should be allowed to proceed to trial.

The Court of Appeal granted leave to appeal, allowed the appeal, and made several orders, including setting aside certain orders of the primary judge, granting leave to the plaintiffs to file and serve an amended consolidated statement of claim, and varying certain orders to include the amended consolidated statement of claim. The Court of Appeal also ordered that certain group members who had become group members by reason of the deletion of a paragraph in the consolidated statement of claim were taken to have become group members from the date of filing of the interlocutory application.

The Court of Appeal found that the primary judge had erred in refusing to grant leave to make the proposed amendments, and that the market-based causation case had reasonable prospects of success. The Court of Appeal also found that the primary judge had misunderstood the appellants' case, and that doubts about the primary judge's decision should have been resolved by the supplementary oral reasons delivered by her Honour. The Court of Appeal concluded that the primary judge ought not to have refused to grant leave to make the proposed amendments, and that the appellants' market-based causation case should be allowed to proceed to trial.