ESG Fund Rating

The ISS ESG Fund Rating, operated by Institutional Shareholder Services (ISS) since 1978 and headquartered in Norwalk, Connecticut, is a data-feed product that delivers environmental, social, and governance performance assessments for more than 25,000 funds globally. It is designed for institutional investors, asset managers, and wealth advisors who need to screen funds for compliance with ESG mandates, meet client sustainability preferences, or align with frameworks such as the UN Principles for Responsible Investment (PRI) and the EU Sustainable Finance Regulation. The rating derives its core signals from the ISS ESG Corporate and Country Ratings, which have been consistently updated for over 25 years and cover more than 7,300 corporate issuers worldwide, providing a materiality-focused, forward-looking view of sustainability performance.

The platform offers a 1-to-5 Relative Star Rating that compares each fund's ESG performance against a defined peer group, alongside ESG Performance Scores based on the underlying corporate and country ratings. It also awards 'Prime' status to issuers that achieve the best ESG scores among their industry peers, signaling strong management of key ESG risks and opportunities. The data feed includes over 1,000 data factors covering major ESG themes such as Global Norms, Carbon Emissions and Climate Change, UN Sustainable Development Goals, Controversial Weapons, and Proxy Voting. Users can perform in-depth screening and analysis on fund performance using metrics from the report and additional factors available on the platform, with automated data aggregation and email delivery for regular updates.

In the market for ESG fund ratings, ISS ESG competes directly with ISS STOXX (its own index and analytics arm), FactSet Corporate ESG Ratings and Research, and Gartner. A key differentiator is the breadth of coverage: ISS ESG rates over 25,000 funds and 7,300 corporate issuers, while FactSet's corporate ESG ratings cover a smaller universe. However, the industry faces a well-documented challenge: according to a 2022 ESMA report, the correlation between ESG ratings from different providers is only about 60%, meaning that ISS ESG's scores may diverge significantly from those of competitors like MSCI or Sustainalytics. ISS ESG's methodology is sector-specific and materiality-focused, but the lack of standardization across providers means investors cannot simply swap one rating for another without recalibrating their models.

The honest trade-offs include methodological opacity: while ISS ESG provides links to primary sources and company ESG reports, the exact weighting of its 1,000+ data factors into the final star rating is not fully transparent. Scores can vary from one rating provider to another due to different methodologies, and there is limited consistency in sector comparisons. The potential for greenwashing remains a concern, as ratings are based on self-reported corporate data and public disclosures, which may not capture all material risks. Additionally, the subscription-based pricing model requires a custom quote, making it difficult for smaller firms to budget without a sales conversation, and the product is only available as a data feed, not as a standalone web application.

Subscription-based pricing model with costs determined by required level of access, number of users, and scope of data or features selected; custom quotes provided based on client requirements. No public tier pricing is available.