The UK’s Financial Conduct Authority has released a major package of proposed rules designed to regulate how ESG ratings providers operate, disclose information and manage conflicts of interest. The initiative marks one of the most ambitious attempts yet by a major global regulator to bring structure and accountability to a rapidly expanding industry that plays a central role in sustainable finance. The FCA’s proposals follow new legislation passed in October that officially places ESG ratings providers under regulatory supervision. Once implemented, the rules will govern both domestic firms and international providers offering ratings within the UK market. The reforms seek to address long-standing concerns about opaque methodologies, inconsistent data quality and potential conflicts that could erode market trust in sustainability assessments.

A Push for Transparency Amid Growing Concerns Over Data Quality and Methodology

The FCA said its decision to advance regulatory oversight was influenced by survey findings showing widespread dissatisfaction among users of ESG ratings. Market participants reported that data sources were often outdated, methodologies were not clearly explained and ratings frequently relied on opaque estimates. Nearly half of respondents indicated that transparency was lacking across critical areas such as how environmental or social indicators were selected, how governance practices were measured and how specific rating scales should be interpreted. The regulator explained that while investors increasingly rely on ESG ratings to guide capital allocation, the lack of clarity about how ratings are produced undermines confidence and increases the risk of greenwashing. The FCA’s proposals therefore place heavy emphasis on minimum disclosure requirements that explain what a rating aims to capture, how various ESG dimensions are weighted and whether the rating assesses risk exposure, impact performance or both. Providers will also be required to disclose whether their assessments compare issuers against absolute sustainability benchmarks or relative peer groups.

Building on International Efforts to Standardise ESG Ratings

The proposals reflect broader international momentum to strengthen oversight of ESG ratings and data providers. In 2021, the International Organization of Securities Commissions issued a call for regulators worldwide to improve transparency, mitigate conflicts of interest and adopt supervisory frameworks for the ESG ratings industry. The FCA has worked closely with IOSCO and referenced the International Capital Market Association’s Code of Conduct as a guiding framework. ICMA’s code, developed with input from global regulators including the FCA, sets expectations for methodological rigour, governance structures and independence. By aligning its proposals with these international standards, the FCA aims to create regulatory consistency that can support the UK’s competitiveness as a sustainable finance hub. A globally aligned framework is expected to reduce friction for international providers and enable cross-border investors to interpret ESG ratings more confidently.

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Governance, Systems and Controls: Setting a New Benchmark for Ratings Quality

The FCA’s proposals outline a detailed package of governance and operational requirements that reflect the growing importance of ESG ratings in the investment landscape. Providers will be expected to implement governance arrangements that are proportionate to their size but robust enough to ensure oversight of methodologies, data sources and quality assurance processes. The regulator is requiring ratings firms to operate systems that ensure analyses are based on relevant, timely and verified information. Methodologies must be applied consistently, with clear processes for periodic review and adjustment as market conditions, reporting standards or sustainability expectations evolve. The proposals also introduce specific rules requiring providers to maintain detailed internal records that support the rationale behind each rating. This would allow the FCA to review how assessments were made and ensure that a provider’s internal controls meet regulatory standards. Additionally, the FCA is requiring firms to maintain a meaningful UK presence that enables effective supervision, reflects their scale of operations and supports local market accountability.

Addressing Conflicts of Interest in a Market Under Pressure

Another key pillar of the proposals focuses on conflicts of interest. The FCA has highlighted concerns that providers who sell both ratings and consultancy services, or who generate commercial revenue from rated entities, may face structural incentives that could compromise impartiality. Under the proposed rules, providers will be required to identify both actual and potential conflicts, maintain processes to manage and mitigate those conflicts and publish a transparent conflict-of-interest policy. Firms must also keep detailed records of conflicts encountered throughout the rating process and demonstrate how they were handled. The FCA noted that building trust in ESG ratings depends not only on methodological rigour but also on independence from commercial pressures that could distort assessments.

Strengthening Stakeholder Engagement and the Rights of Rated Companies

The new rules introduce several requirements aimed at improving communication between ratings providers, rated entities and rating users. Providers will be required to notify companies before issuing an ESG rating for the first time, giving them an opportunity to correct factual errors. Rated firms will also be allowed to request the underlying data used to produce their rating. The FCA has also proposed a formal process for handling complaints and feedback from stakeholders. Providers must maintain channels for receiving concerns, documenting responses and resolving disputes. These requirements reflect the regulator’s objective of building a more transparent and accountable relationship between ESG ratings firms and the companies they evaluate.

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A Long-Term Transition Toward Full Regulatory Oversight

Commenting on the proposals, Sacha Sadan, Director of Sustainable Finance at the FCA, said that the rules are designed to increase trust and transparency in the sustainable finance sector. He added that credible ratings frameworks can strengthen the UK’s position as a global hub for green and responsible investment. The FCA has opened a consultation period that will run until the end of March 2026. The regulator plans to finalise its rules in the fourth quarter of 2026, with implementation scheduled to begin in June 2028. The multi-year rollout reflects the extensive changes required across the industry, including new governance systems, data processes and operational standards that providers will need to build from the ground up.

A Turning Point for ESG Ratings in the UK and Beyond

The FCA’s proposals represent one of the most far-reaching regulatory efforts aimed at transforming how ESG ratings are generated and used. With stronger governance, clearer disclosures and more stringent conflict management rules, market participants are expected to gain greater clarity about what ESG ratings represent and how they should be interpreted. The new framework also sets a precedent that may influence regulators in Europe, Asia and North America, many of whom are closely monitoring the rapid expansion of ESG data and analytics industries. As sustainable finance continues to grow, the FCA’s initiative signals the beginning of a new era in which ESG ratings must meet the same standards of transparency and reliability as other financial information used to guide global capital flows.

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