What Is Morningstar Sustainability Ratings?

The Morningstar Sustainability Rating is a system designed to evaluate the environmental, social, and governance (ESG) risks within mutual funds and exchange-traded funds (ETFs). It provides investors with a way to assess how well a fund's holdings manage financially material ESG risks. This rating is widely used by financial professionals and individual investors who want to integrate sustainability considerations into their investment decisions.

How Morningstar Sustainability Ratings Work

The rating is based on the Sustainalytics ESG Risk Ratings, which measure the degree to which a company's economic value is at risk due to ESG factors. Sustainalytics, a subsidiary of Morningstar, assesses individual companies and assigns ESG risk scores. These scores are then aggregated at the fund level to determine the Morningstar Sustainability Rating.

To qualify for a rating, a fund must meet certain criteria, including a minimum level of ESG coverage across its holdings. The process follows these steps:

1. Company-Level ESG Risk Ratings: Sustainalytics assigns ESG risk scores to individual companies based on their exposure to ESG issues and how well they manage them. These scores reflect the likelihood of ESG-related risks affecting a company’s financial performance.
2. Portfolio ESG Risk Score Calculation: Morningstar aggregates the ESG risk scores of a fund’s holdings, weighting them according to their portfolio allocation. This results in a portfolio-level ESG risk score.
3. Peer Group Comparison: The fund's ESG risk score is compared to those of similar funds within a Morningstar Global Category. This step ensures that funds are rated relative to their industry peers rather than being assessed against an arbitrary standard.
4. Rating Assignment: Funds receive a sustainability rating based on a five-globe scale, with one globe indicating the highest ESG risk and five globes representing the lowest risk. The ratings are distributed based on percentile rankings within each peer group:
5. • 5 Globes: Lowest ESG risk (top 10%)
   • 4 Globes: Below-average risk (next 22.5%)
   • 3 Globes: Average risk (middle 35%)
   • 2 Globes: Above-average risk (next 22.5%)
   • 1 Globe: Highest ESG risk (bottom 10%)

Morningstar updates these ratings monthly to reflect changes in portfolio composition, individual company ESG risk scores, and market conditions.

What the Rating Represents

The Morningstar Sustainability Rating is designed to measure the level of ESG-related financial risk within a fund’s holdings rather than its positive impact on sustainability. This distinction is important—funds that receive high sustainability ratings are those with lower ESG risk, not necessarily those that actively contribute to solving environmental or social challenges.

For example, a fund invested in large, well-managed technology firms with minimal ESG controversies may receive a strong sustainability rating, even if it does not explicitly focus on ESG or sustainability-themed investments. Conversely, a fund that holds renewable energy stocks may receive a lower rating if those companies face high ESG-related risks, such as regulatory uncertainty or supply chain vulnerabilities.

Limitations of the Rating

While the Morningstar Sustainability Rating provides valuable insights, it has several limitations:

• Backward-Looking Assessment: The rating is based on historical data and does not account for future ESG improvements or risks that companies may encounter.
• Sector Bias: Some industries naturally have lower ESG risks than others. For instance, a technology-focused fund may score better than an energy-sector fund, even if the latter invests in companies that are making significant sustainability advancements.
• No Active ESG Strategy Indicator: The rating does not indicate whether a fund is actively pursuing sustainability goals or if it is simply composed of low-ESG-risk companies.
• Fund Composition Changes: Since ratings are updated monthly, a fund’s sustainability rating can fluctuate based on changes in portfolio holdings, making it necessary for investors to monitor updates.

How Investors Use the Rating

Investors and financial advisors use the Morningstar Sustainability Rating to compare funds and integrate ESG risk analysis into their investment process. Some common applications include:

• Screening for Low ESG Risk Funds: Investors seeking to minimize ESG-related financial risks can use the rating to identify funds with low ESG risk exposure.
• Aligning Investments with Sustainability Goals: While the rating does not measure a fund’s positive ESG impact, investors may use it alongside other ESG data to find funds that align with their values.
• Portfolio Risk Management: By incorporating sustainability ratings, investors can gain a broader understanding of potential risks that may affect long-term investment performance.

The Bottom Line

The Morningstar Sustainability Rating serves as a tool for assessing ESG-related financial risks in mutual funds and ETFs. It provides investors with a standardized way to compare funds based on their exposure to ESG issues but does not indicate whether a fund actively seeks to make a positive impact. While the rating offers useful insights, investors should consider it alongside other ESG factors and financial metrics to make well-informed investment decisions.