The role of ESG ratings in reporting

ESG ratings evaluate companies’ sustainability performance and shape investor decision-making. They influence access to financial capital, pricing of sustainability-linked financing, and overall market confidence. As expectations for credible reporting continue to rise, companies must understand how ESG ratings work and how they interact with reporting frameworks such as the EU’s Corporate Sustainability Reporting Directive (CSRD), the International Sustainability Standards Board’s IFRS S1 and S2 standards, and the Taskforce for Nature-related Financial Disclosures (TNFD) framework. To anchor these disclosures in legally compliant frameworks, corporate teams must first establish a rigorous baseline for what counts as a Material Impact under the CSRD to avoid data gaps. 

What are ESG ratings and why do they matter?

ESG ratings evaluate how well companies manage environmental, social, and governance issues that affect their businesses, influencing business resilience and long-term performance. They reflect a company’s maturity in terms of governance and risk management, climate strategy and environmental stewardship, and social practices. They also benchmark companies against competitors.

Ratings matter. They influence how banks and asset managers assess risk exposure and how credit providers determine ESG maturity when pricing sustainability-linked loans. Companies with stronger ratings have easier access to financing — often receiving better financing conditions.

ESG ratings also shape corporate reputation. They are a gauge of responsible conduct. High ratings enhance supplier and customer trust, while poor ratings undermine credibility and signal potential governance or operational weaknesses.

ESG ratings also support internal decision-making. Ratings assessments can reveal previously unconsidered risks or gaps in governance, processes and practices. 

What ESG ratings measure and how they influence reporting

ESG ratings measure performance across three broad dimensions — environment, social and governance. 

• Environment. Evaluates strategy and performance related to climate change adaptation and mitigation, nature, , resource use and pollution control, across the value chain. 
• Social. Covers employee-related issues including workforce wellbeing, training and development, health and safety and diversity, alongside wider issues of human rights within the supply chain, and customer responsibility. 
• Governance. Focuses on ethics, transparency, control processes and procedures, risk management, and board structure and accountability.
• A focus on clear, structured, and evidence-based reporting supports strong ratings. Aligning reporting with recognised frameworks helps increase transparency around the types of ESG disclosures raters use to assess performance. For example, organisations that strengthen climate disclosures using the principles outlined in IFRS S2 Climate-related Disclosures explained often see improvements against the environmental components within a rating. Similarly, companies that apply the double materiality insights discussed in What counts as a material Impact under CSRD typically strengthen their reporting foundations.

Major ESG ratings providers and what they assess 

Several well-known ratings providers evaluate corporate sustainability performance. While their goals are similar, each uses a different methodology and data sources. Some rely only on publicly available information, while others require companies to file a dedicated submission or send a questionnaire designed to fill in gaps in public disclosures. Ratings also vary in scope, with some covering all aspects of environmental, social and governance performance, while others only assess a single aspect. Combined ratings use different methods to weight the environmental, social and governance elements to create a single score. These differences explain why two providers may produce different scores for the same organisation.

Some of the most common providers are:

• MSCI. Evaluates companies based on their exposure to and ability to manage sector-specific sustainability risks, issuing a rating from CCC (lowest) to AAA (highest). The assessment is based on public information, including  policies, performance history, controversies, and governance systems, supplemented by additional disclosures and data. Companies with consistent, transparent sustainability disclosures often perform well on MSCI’s scoring model.
• Sustainalytics. Focuses on the financial impact of unmanaged material ESG risks  In its evaluation, it emphasises information relating to governance and risk mitigation systems. This approach aligns closely with financial reporting frameworks such as the ISSB Standards and IFRS S2 (see SASB vs ISSB: What companies need to know).
• S&P Global. Uses a dedicated Corporate Sustainability Assessment to evaluate organisations across governance, environmental management and social responsibility. Companies that follow structured frameworks such as GRI or CSRD often perform better because these frameworks provide more consistent, evidence-based disclosures.
• CDP. Assesses companies’ climate, water, and supply chain performance using structured questionnaires. These questionnaires align closely with CSRD and IFRS S2 requirements. Companies that provide detailed descriptions of governance, strategy and climate transition plans often perform well in CDP assessments.
• FTSE Russell. Evaluates companies using a set of indicators across environmental, social and governance topics. These ratings influence investor decisions and inclusion in indexes such as the FTSE 100. Organisations that provide transparent, consistent reporting aligned with recognised frameworks perform well.

How ESG ratings influence sustainability strategy, governance and data 

ESG ratings influence more than reporting. They shape strategy, operations, processes, and financial decision-making. Companies use ratings to identify strengths and where they need to improve.

Strong governance is central to all these areas. As discussed in How to align existing reports with CSRD requirements, it is also central to both mandatory and voluntary reporting frameworks. Ratings can help to identify opportunities to strengthen governance structures , ethical controls and risk management. . They also reinforce the need for clear accountability and transparent decision-making.

Ratings influence strategy. Companies need to understand where sustainability risks create operational vulnerabilities or financial exposure. This helps shape investment plans, supply chain strategies and climate transition plans. 

Reporting on greenhouse gas emissions directly influences environmental rating components. Effective data systems and processes are the foundation of effective emissions reporting, as noted in Understanding scope 3 emissions for reporting. Investment is data and systems often goes hand in hand with company efforts to strengthen ratings. This supports both reporting quality and operational resilience.

The link between ESG ratings and key reporting frameworks

ESG ratings do not replace reporting frameworks. They depend heavily on the quality of disclosures produced under them. Companies that use recognised frameworks build stronger foundations for ratings assessments.

GRI Standards provide detailed requirements for impact-based reporting. Companies that apply these standards often demonstrate stronger transparency across environmental and social topics, supporting ESG ratings. Our article GRI Standards: What’s changing in 2026 provides an update on the changes affecting reporting scope and practice.

CSRD and the accompanying European Sustainability Reporting Standards (ESRS) introduce structured, mandatory sustainability reporting that includes governance, double materiality, due diligence, and performance indicators. Companies aligned with the CSRD often provide the depth and clarity of disclosure that ratings providers expect.

ISSB Standards and SASB metrics focus on financially relevant sustainability information. These frameworks help companies explain how sustainability matters influence enterprise value. Ratings providers use this information to assess long-term risk exposure.

IFRS S2 strengthens climate reporting through precise requirements for governance, strategy, risk management and emissions disclosures. This directly influences climate components of ESG ratings.

TNFD supports organisations seeking to evaluate nature-related risks. Ratings providers increasingly assess biodiversity, land use and ecosystem impacts, which makes TNFD guidance valuable.

How companies can improve their ESG ratings

Companies seeking stronger ESG ratings should start by reviewing their existing ratings to identify opportunities for improvement — for example a need for stronger governance or better data, or increased focus on a specific sustainability issue.

1. Priority should be given to the most material issues, so that work to improve ratings does not detract from core efforts to reduce negative impacts and increase positive impacts. Sustainability topics are more or less relevant depending on the sector. A rating provider could mark a company down for their failure to report on an issue, e.g. water stewardship, even if the company does not consume much water. Strengthen foundations. Organisations should update their core processes, including  data quality and accuracy, governance controls and materiality assessment. Structured frameworks such as CSRD, GRI, ISSB, and IFRS S2 support this improvement. Aligned reporting provides the evidence raters rely on when evaluating performance.
2. Update systems. Data systems must produce traceable, verifiable information. Companies should build systems that allocate clear responsibilities, maintain documentation and ensure consistency across reporting cycles. This supports both ratings and independent assurance.
3. Engage stakeholders. Engagement improves ESG performance because it identifies risks, supports more credible materiality assessments and informs better policies, processes and procedures.
4. Supplement disclosures. Companies should also respond to rating feedback. Most ESG rating agencies publish analyses that highlight opportunities for improvement. Targeting these areas will support stronger performance in future reporting cycles.

How Context Sustainability supports ESG ratings improvement

Context Sustainability helps organisations strengthen their reporting systems, governance structures, and data quality to improve ESG ratings. We support companies in aligning their disclosures with CSRD, ESRS, GRI, IFRS S1 and S2, SASB, ISSB, and TNFD. Our advisory services help clients complete gap analyses, update reporting processes, improve evidence systems and create clear sustainability narratives that reflect long-term resilience.

Companies seeking stronger ESG ratings can work with us to build a structured reporting pathway that integrates best practices across impact, financial relevance, governance, due diligence, and performance measurement.

Frequently Asked Questions

Why do major ESG ratings providers frequently issue conflicting scores for the same company?

Ratings providers have distinct methodologies, data weightings, and risk boundaries. For example, certain agencies focus primarily on industry-specific financial risks, while others evaluate broader stakeholder impact or unmanaged operational risk. If a company is particularly strong in one area but weaker in another, this would result in varying scores across different ratings.

How can an organisation systematically improve the environmental component of its ESG rating?

Improving an environmental rating requires verified, evidence-based disclosures backed by granular data. Organisations can achieve this by aligning climate reporting with internationally recognised reporting frameworks, setting science-based targets, and providing clear documentation on calculation methodologies.

What is the relationship between ESG ratings and corporate financing?

Many financial institutions use ESG ratings to assess corporate risk before investing. Companies with strong ESG ratings frequently secure more favourable borrowing terms and lower interest rates from institutional lenders. 

How do upcoming mandatory disclosure regulations impact voluntary ESG ratings?

Mandatory frameworks force companies to publish more standardised sustainability reports and metrics. This influx of publicly available and often audited data reduces the reliance of rating agencies on estimated figures or qualitative questionnaires, leading to more accurate, reliable, and consistent ratings across sectors.