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SHAREHOLDER CLASS ACTIONS IN AUSTRALIA: UNCERTAINTY FOR THE FUTURE OF MARKET-BASED CAUSATION

SHAREHOLDER CLASS ACTIONS IN AUSTRALIA: UNCERTAINTY FOR THE FUTURE OF MARKET-BASED CAUSATION

The following article was contributed by Nikki Stever and Madison Smith of Australia-based commercial law firm, Piper Alderman. In the third decision delivered in a shareholder class action in Australia,[1] Iluka Resources Limited (ASX: ILU), (Iluka) succeeded in its defence of a lawsuit[2] which failed to prove that the shareholders’ direct reliance on Iluka’s conduct caused their losses. However, the decision in favour of Iluka notably lacked any significant consideration of the second causation argument typically pleaded in shareholder class actions – market-based causation. Background of the matter Iluka is a large mining company and global supplier of mineral sand products. On 9 July 2012, Iluka revised its sales guidance for its products, resulting in a 25% drop in share price. The shareholders alleged that Iluka’s sales guidance leading up to its announcement:
  1. was misleading or deceptive; and
  2. breached their continuous disclosure obligations.
The lead applicant purported that reliance on the sales guidance impacted their decision to purchase shares in the company (direct reliance).  It is not clear to the authors if the lead applicant or shareholders pleaded that the market as a whole was impacted by the sales guidance (market-based causation). The Federal Court of Australia (FCA) rejected both claims on the basis that the representations alleged were not actually made, and were merely statements/guidance about Iluka’s expectations and were not guarantees or predictions/forecasts of future performance. The FCA also found that the lead applicant relied on various external stock reports rather than statements made by Iluka, causing the direct reliance case to fail. Direct reliance and market-based causation Direct reliance in a shareholder class action requires the claimant to prove they actually relied on the contravening conduct (i.e. statements) when deciding to acquire shares in the defendant company, and that the subsequent decrease in share price was directly related to the contravening conduct, resulting in loss to the shareholder. Market-based causation is based on establishing that the price that the defendant’s shares traded on the market was inflated by the contravening conduct, such that the claimant prima facie suffered loss by paying an increased price for the shares. The Court has accepted this proposition,[3] however, also suggested that it may still be necessary for individual shareholders to give evidence that, but for the contravention by an entity, they would not have purchased the shares (or not at the price paid) in order to establish loss.[4] Causation and loss in Iluka Because the Court found that no representations were made (and therefore they were not capable of being relied upon, either directly or by the market), the judgment was relatively quiet in relation to causation. While there is reference to the failed direct reliance case, in so far as it was held that the lead applicant did not rely on the sales guidance issued by Iluka when deciding to purchase the shares, unusually the judgment is completely silent on market-based causation. In previous cases where market-based causation has been alleged by the plaintiff, the but for test has been discussed by the FCA in the context of considering misleading or deceptive conduct claims.  For example, the alleged contraventions in Myer and Re HIH were assessed by considering whether the alleged loss would not have occurred but for the contraventions.[5] The High Court in Australia has offered an alternative approach in cases of proving factual causation of misleading and deceptive conduct generally – the ‘a factor’ test.[6] The a factor test is satisfied if the misleading or deceptive conduct was a factor in the occurrence of the plaintiff’s loss, or in other words materially contributed to the plaintiff’s loss. In Iluka, this test for market-based causation would be satisfied if the alleged contraventions materially contributed to the shareholders’ loss, rather than the more stringent test of whether the contraventions were necessary for the loss. The a factor test, if adopted, arguably offers a more appropriate test for market-based causation in cases of misleading or deceptive conduct. Firstly, it is more reliable and intuitive.[7] For example, the but for test requires counterfactual speculation as to how a market would have responded but for a particular event. This can be a difficult exercise for a plaintiff to speculate and quantify the loss. The a factor test shifts the requirements from necessity to contribution and is not as easily defeated by a claim that it was not the only factor relevant to the plaintiff’s loss. Secondly, the test also avoids duplicative causation, as market-based causation often involves multiple factors that could have affected share prices.[8] The court does not need to assess each separate factor and consider its relative relevance to the causal loss overall, as is required when assessing the causal conduct following the but for test. Finally, the a factor test promotes the deterrence of all misleading or deceptive conduct by providing a broad opportunity for the conduct to be considered misleading or deceptive, regardless of whether it was necessary for the loss.[9] Conclusion By failing to address market-based causation, the Iluka decision has created uncertainty around what causal test the court would be willing to accept for shareholders to succeed with a market-based causation claim. It is only a matter of time before there is a substantial decision on this point, however, until this occurs, the law on market-based causation remains unsettled. About the Authors Nikki Stever, Special Counsel  — Nikki specialises in complex litigation and disputes, with an emphasis on class actions and disputes involving corporations, competition and consumer legislation and disputes concerning breaches of trust and fiduciary duties. Nikki frequently works with litigation funders and is experienced in the structuring and conduct of funded litigation, across all Australian jurisdictions. Madison Smith, Lawyer  — Madison is a litigation and dispute resolution lawyer at Piper Alderman with a primary focus on corporate and commercial disputes. Madison is involved in a number of large, complex matters in jurisdictions across Australia. For queries or comments in relation to this article please contact Kat Gieras, Litigation Group Project Coordinator | T: +61 7 3220 7765 | E:  kgieras@piperalderman.com.au — [1] Following Crowley v Worley Limited [2020] FCA 1522 and TPT Patrol Pty Ltd as trustee for Amies Superannuation Fund v Myer Holdings Ltd [2019] FCA 1747. [2] Bonham v Iluka Resources Ltd [2022] FCA 71. [3] In the matter of HIH Insurance Limited (In Liquidation) [2016] NSWSC 482; TPT Patrol Pty Ltd as trustee for Amies Superannuation Fund v Myer Holdings Ltd [2019] FCA 1747. [4] TPT Patrol Pty Ltd as trustee for Amies Superannuation Fund v Myer Holdings Ltd [2019] FCA 1747, [1671]. [5] In the matter of HIH Insurance Limited (In Liquidation) [2016] NSWSC 482; TPT Patrol Pty Ltd as trustee for Amies Superannuation Fund v Myer Holdings Ltd [2019] FCA 1747. [6] Henville v Walker [2001] HCA 52, [61] and [106]. [7] Henry Cooney, Factual causation in cases of market-based causation (2021) 27 Torts Law Journal 51. [8] Ibid. [9] Ibid.
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Merricks Steps into Trains Case Amid Funding Tensions

By John Freund |

Veteran solicitor-campaigner Walter Merricks is poised to assume the role of class representative in a major collective action against rail operator Govia Thameslink Railway, following the death of the previous lead claimant. The case — brought under the opt-out regime before the Competition Appeal Tribunal (CAT) — alleges anticompetitive fare charging that harmed passengers traveling without a London Travelcard.

An article in the Law Society Gazette states that Merricks has formally applied to take over from former class representative David Boyle, who passed away earlier this year. The transition raises “a number of complex and difficult issues,” given the opt-out nature of the proceeding and the procedural demands of the UK’s evolving collective redress framework.

The move comes amid broader tensions between Merricks and his former litigation funder, Innsworth Capital. That dispute centers on the earlier £200 million settlement of Merricks’ landmark claim against Mastercard. Though the CAT approved the settlement, Innsworth launched a judicial review and initiated arbitration proceedings to challenge the allocation of proceeds, arguing its entitlement to a larger portion of the award. Merricks has been openly critical of the funder’s conduct, calling its approach an “embarrassment” and warning it could undermine public trust in third-party funding.

For the rail case, Merricks has retained Wilkie Farr & Gallagher as counsel. His application to replace Boyle as class representative is currently before the tribunal and will be considered at a hearing in January 2026.

Pogust Goodhead Secures Landmark Win Against BHP in Brazil Dam Case

By John Freund |

In a major breakthrough for cross-border group litigation, Pogust Goodhead has secured a resounding victory in its long-running claim against mining giant BHP over the 2015 collapse of the Fundão tailings dam in Mariana, Brazil. The UK High Court has ruled BHP liable for the disaster, which killed 19 people and unleashed a wave of toxic sludge through the Rio Doce basin, displacing entire communities and leaving lasting environmental damage.

According to Non-Billable, the ruling confirms BHP’s liability under both Brazilian environmental law and the Brazilian Civil Code. In rejecting the company’s jurisdictional and limitation defenses, the court made clear that English law recognizes the right of over 600,000 Brazilian claimants to pursue redress in UK courts. The judgment underscores BHP’s operational and strategic control over the Samarco joint venture and found that the company was aware of critical dam defects more than a year before the collapse. The attempt to distance itself through the argument of being an indirect polluter was also dismissed.

This outcome is a critical milestone in one of the largest group actions ever brought in the UK. A trial on damages is now scheduled for October 2026, with case management proceedings set to resume in December.

The win comes amid internal turbulence at Pogust Goodhead, including recent leadership changes and reported tensions with its litigation finance backers, but the firm remains on course to press forward with what could be a multibillion-dollar compensation phase.

Incentive Payments Not Essential for Named Plaintiffs, Study Finds

By John Freund |

A new empirical study by Brian Fitzpatrick of Vanderbilt Law School challenges a widely held assumption in class action litigation: that incentive payments are necessary to recruit named plaintiffs. The research, published in the Journal of Empirical Legal Studies, analyzed federal class-action filings from January 2017 through May 2024, using data drawn from the legal-tech platform Lex Machina. It leveraged a natural experiment created by the United States Court of Appeals for the Eleventh Circuit’s 2020 ruling that barred incentive payments in the 11th Circuit (Florida, Georgia, Alabama) while other circuits continued permitting them.

An article in Reuters states that according to the analysis, the volume of class-actions filed in the 11th Circuit did not meaningfully decline relative to other circuits after the ban on incentive payments. In other words, the absence of such payments did not appear to impair the ability of plaintiffs’ counsel to find willing named plaintiffs.

Fitzpatrick and his co-author, graduate student Colton Cronin, observed that although courts routinely approve modest incentive awards (averaging about $7,500 in non-securities class actions) to compensate the named plaintiff’s extra effort post-settlement, the data suggest that payments may not be a driving factor in recruitment.

Fitzpatrick emphasizes that this is not to say incentive payments have no role. He notes that there remains a moral argument for compensating named plaintiffs who shoulder additional burdens. These include depositions, discovery responses, trial participation, and public exposure. Yet the study’s finding is notable. Motivation for class-representation may be rooted more in altruism, reputation or justice-seeking than in straightforward financial gain.

For the legal-funding industry and class-action litigators, the findings are significant. They suggest that reliance on incentive payments to secure named plaintiffs may be less critical than previously assumed, potentially lowering a transactional cost input in structuring class settlements. On the other hand, third-party funders and litigation financiers should consider how the supply of willing named plaintiffs might remain stable even in jurisdictions restricting such payments.