As sustainability statements become more structured, more visible and more relevant to investor decision-making, the boards of UK listed and/or UK regulated firms should be increasingly treating them as a disclosure governance issue, not simply a reputational one.

For years, boards have discussed ESG (environmental, social and governance) mainly through the lens of strategy, stakeholder expectations and corporate reputation. That is understandable. It is also no longer enough. ESG statements are becoming evidence.

ESG disclosures are becoming more formal, more comparable and more vulnerable to challenge. For CEOs, chairs, non-executive directors and general counsel, that creates a category of risk that sits at the intersection of governance, disclosure and litigation.

In the UK, the risk is no longer theoretical, and the change is not driven by a single reform. It is the result of several developments moving in the same direction. The Financial Conduct Authority’s anti-greenwashing requirements already apply to FCA-authorised firms making sustainability-related claims about products and services. SDR continues to shape disclosure expectations within its perimeter. UK SRS S1 and S2 have also now been published for voluntary use.

Different regimes apply in different ways, and specific obligations may vary by regime and firm type, but the overall direction is consistent—and clear—across the UK. Sustainability disclosure is moving away from broad narrative and towards more evidence-based and potentially more contestable information.

That matters because many ESG statements are inherently exposed to hindsight challenge. Transition plans, financed emissions, scenario analysis and net-zero pathways often depend on assumptions, estimates, proxy data and methodological judgment. They may be reasonable when made, but they should also be capable of support.

Legal changes

At the same time, the litigation landscape in this area has developed. Sections 90 and 90A of the Financial Services and Markets Act 2000 have already shown that securities claims can be brought on a large and well-funded basis. Since 19 January 2026, regulation 30 of the Public Offers and Admissions to Trading Regulations 2024 has also become relevant for new in-scope prospectus-type documents.

The legal routes therefore may differ, including procedural routes across the UK’s jurisdictions (albeit to date claims have typically been brought in the courts of England and Wales). But the practical lesson is similar: public-facing statements that matter to investors may create meaningful exposure.

ESG presents a distinctive challenge for boards because it rarely sits neatly in one category. A single statement may combine current factual assertions, methodological judgment and forward-looking claims about targets, resilience or strategy. Ownership is often spread across legal, finance, sustainability, risk, compliance and investor relations teams. Without a strong control framework, inconsistency and evidential gaps may emerge relatively quickly.

That is why boards should perhaps now focus less on the ambition of the message and more on the governance behind it. It is not a specialist workstream. It belongs within mainstream disclosure governance.

Immediate priorities for boards

Boards should ensure there is a single disclosure control framework across annual reports, investor presentations, transaction documents, websites and all other key public materials.

They should expect a clear protocol for forward-looking sustainability statements, including documented assumptions, internal challenge, identified ownership and properly tailored cautionary language.

They should ask whether the organisation has a defensible audit trail covering data sources, methodologies, changes in approach, committee consideration, approvals and any external assurance.

ESG should be treated as a litigation and disclosure risk, not merely a communications issue. That means reviewing escalation procedures, document retention, insurance alignment and whether existing disclosure committees are properly equipped to oversee this area.

Financial institutions may face a broader set of exposures still. They face risk not only in their own sustainability claims and product disclosures, but also in transactions and client-facing contexts where ESG forms part of the investment or financing story. For banks, insurers and asset managers, the risk can be both direct and indirect.

None of this means that the UK is a US-style class action market. But that is not the right benchmark. The real point is that UK securities litigation— particularly in the courts of England and Wales—is credible, well-funded and increasingly sophisticated. ESG disclosures are an obvious area for future scrutiny because they are becoming more standardised, more visible and more likely to influence investor decision-making.

The key, board-level question is therefore likely a simple one: if an ESG statement were challenged later, could you show what was known, what was assumed, what challenge took place and why the statement was reasonable when published?

Boards of UK listed and/or UK regulated firms who can answer that question are likely to be much better placed than those still treating ESG disclosure principally as a matter of narrative.

Christian Toms is a partner in the Litigation Practice Group of law firm Squire Patton Boggs