Why Most Collective Actions Fail Before They Reach Court

Across the UK, EU, US, and Australia, collective actions are failing at scale. They rarely fail at trial or on the merits. Most collapse long before any court decides who was right.

The conventional narrative blames complex certification rules, aggressive defence tactics, or unpredictable funding laws. These factors matter, but they do not tell the whole story. For the organisations bringing claims, they are also often not the most actionable ones. In the US, dismissals — rather than settlements — accounted for the majority of federal securities class action resolutions in 2024.

124 of 217 federal securities class action resolutions in the US in 2024 ended in dismissal rather than settlement.

Key takeaways

• Collective actions rarely fail on legal merit — most break down at four recurring points: procedural fragility, economic unravelling, proof, and claimant attrition.
• Claimant attrition is cumulative, not a single dramatic event — it builds from missed updates, inconsistent information, and silence.
• A poorly maintained claimant register is a legal liability, not just an administrative one — defendants will use data inconsistency as evidence the class lacks coherence.
• Reform agendas (PACCAR reversal proposals, the EU’s Representative Actions Directive, Victoria’s group costs orders) address funding and procedure, not the operational layer.
• Prevention is operational: treat the claimant register as a legal instrument, segment and personalise communication, and set realistic expectations from day one.

What the data actually shows about collective action failure

Research across multiple jurisdictions identifies four recurring failure clusters.

1. Procedural fragility

Courts and tribunals demand that claims rise or fall on genuinely common answers. In Wal-Mart v Dukes, the US Supreme Court reversed certification of a nationwide employment class. Decentralised managerial discretion could not generate the common answer that the certification requirements of US Federal Rule of Civil Procedure 23 (“Rule 23”) demand.

In the UK, the Competition Appeal Tribunal refused a collective proceedings order in Riefa v Apple [2025] CAT 5 on governance grounds rather than merits. The tribunal found the representative lacked sufficient understanding of the funding and after-the-event (ATE) insurance arrangements. In Canada, the court dismissed Kaplan v Casino Rama¹ at the certification stage. Despite a common hacking event, individual class members had suffered a wide range of losses.

2. Economic unravelling

The UK’s PACCAR ruling cast doubt over numerous existing litigation funding agreements, causing delays, repricing, and abandoned claims. Australia’s BMW v Brewster removed the courts’ ability to make common fund orders — arrangements where all class members share funding costs, win or lose — at the start of proceedings.

In every loser-pays jurisdiction, including the UK, EU, Australia, and Canada, adverse-cost exposure is a constant pressure. Teams must manage it from the outset, not discover it on the eve of trial.

3. Proof

Defendants use pass-on (arguing the claimant passed their loss to someone else, such as a customer), causation, reliance, and individual loss calculations as attack surfaces. The larger and more diverse the class, the more ammunition a defendant has to argue the case requires mini-trials.

4. Claimant attrition, communication, and trust

This cluster receives the least attention in legal commentary. It is often the most preventable.

Claimant attrition is cumulative and compounding

Attrition does not happen in a single dramatic event. It accumulates.

When a firm fails to update a claimant regularly, the claimant disengages. When a claimant receives inconsistent information, they start to doubt. When a claimant feels ignored, they stop responding to data requests. Multiply that across a class of 5,000 people, and a well-defined group dissolves into a patchwork of unverifiable records and uncontactable individuals.

Courts and defendants alike will probe whether the firm has properly defined the class, ensured adequate representation, and backed the claim with reliable individual data. Attrition creates gaps. Gaps create risk.

Communication breakdowns undermine representativeness

A class representative faces both governance and legal challenges if they cannot demonstrate the ongoing, informed consent of class members.

Silence from claimants is not neutral — it creates vulnerability precisely when the case needs to look strongest.

Communication failures compound in predictable ways. Firms fail to follow early-stage enthusiasm with structured updates. Claimants receive generic correspondence they do not understand. Key milestones — funding secured, certification filed, settlement discussions commenced — are communicated inconsistently or not at all.

When adverse events occur, such as delays or funding amendments, the firm lacks an established channel of trust through which to explain the change. Claimants lose confidence. Some withdraw. Others become unreachable.

Data quality problems become legal problems

Poor data hygiene in a claimant register causes more than administrative inconvenience. Duplicate records, missing verification data, outdated contact details, unresolved know-your-customer (KYC) checks, and inconsistent evidence of individual harm all create exposure.

In a certification hearing or admissibility challenge, defendants will use any provable inconsistency in the claimant data as evidence the class lacks coherence, proper definition, or reliable management. A well-run claimant register serves as a legal asset. A poorly maintained one becomes a liability.

What a well-run collective action looks like operationally

Onboarding and communication infrastructure

Structured onboarding means the operations team verifies, documents, and integrates each claimant into a communications framework from day one — confirming identity, eligibility, and consent before the legal team uses the register for any legal purpose.

Regular, clear communication means claimants receive consistent updates at defined intervals, in plain language proportionate to the case’s stage. The operations team tracks and acts on engagement data: open rates, response rates, and opt-outs.

Data governance and trust management

Data governance throughout the lifecycle means treating the claimant register as a living legal document, not a static spreadsheet. The team records and audits changes, withdrawals, updated contact details, and resolved queries, so the register at trial is demonstrably more reliable than the register at filing.

Proactive trust management means that when something changes — funding, timeline, settlement discussions — the team tells claimants promptly, clearly, and with appropriate context. Silence is never the default.

Funder and insurer alignment matters too. Teams should document and disclose ATE cover, adverse-cost exposure, and funder return structures early, so those arrangements can withstand a governance challenge rather than being tested for the first time under one.

What the reform agenda means for claimant operators

Policy is moving, but slowly and unevenly. In the UK, the Civil Justice Council’s June 2025 final report recommended legislative reversal of PACCAR and a broader regulatory framework for litigation funding.

In the EU, the Representative Actions Directive created a minimum framework, though several Member States had still not transposed it as of 2025. In Australia, Victoria introduced group costs orders as a new funding mechanism.² In Canada, Ontario now requires court approval for third-party funding agreements.³

None of these reforms addresses the operational layer. Keeping thousands of claimants engaged, informed, and properly documented across years of uncertainty remains the responsibility of whoever runs the case. That is, increasingly, a specialist function. The organisations that understand this earliest secure the clearest competitive and operational advantage.

Prevention strategies: what changes outcomes

Treat the claimant register as a legal instrument from day one

Every record should be maintained as if it will face scrutiny in court — because it will. Teams must also establish a communications cadence before they need it. Claimants who receive nothing for six months do not suddenly re-engage when confirmation is required; the relationship must be built early and maintained consistently.

Segment, personalise, and read engagement as risk data

Communications should be segmented and personalised. A consumer who registered through a website and a client referred by a professional firm require different treatment, language, and levels of detail. One-size correspondence fails both.

Teams should read engagement metrics — open rates, response rates, withdrawal signals — as risk indicators, not vanity metrics. Falling engagement is an early warning of attrition. It should trigger intervention, not be noted and ignored.

Set realistic expectations and audit data throughout the lifecycle

Firms should prepare claimants for the real timeline from the outset. Litigation takes years. Claimants who understand this at registration are significantly less likely to withdraw during a delay or an adverse interlocutory development.

Setting expectations clearly in writing, and reinforcing them at key milestones, is one of the lowest-cost, highest-return investments a case team can make. Data audits — covering KYC, address verification, and evidence documentation — should run at defined intervals throughout the lifecycle, not only at filing and certification.

Building a collective action that holds together

Mediatasks designs and operates the claimant management infrastructure that law firms, funders, and claims operators need — from verified onboarding through settlement distribution. Our infrastructure covers the full claimant lifecycle: initial acquisition and eligibility screening, verified onboarding, ongoing engagement, data governance, and settlement distribution support. We operate across the UK, EU, and international matters, with CRM and automation architecture built for the compliance and confidentiality requirements of legally sensitive environments.

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¹ Kaplan v Casino Rama, 2019 ONSC 2025 (Ontario Superior Court of Justice). Available at: canlii.org/en/on/onsc/doc/2019/2019onsc2025/2019onsc2025.html
² Supreme Court Act 1986 (Vic), s 33ZDA, inserted by the Justice Legislation Miscellaneous Amendments Act 2023 (Vic). See also Victorian Law Reform Commission, Access to Justice — Litigation Funding and Group Proceedings (2018).
³ Class Proceedings Act, 1992, SO 1992, c 6, s 33.1, as amended by the Protecting People and Property Act, 2021, SO 2021, c 4, Sched 4.