The S&P 500^® ESG Leaders Index seeks to provide a measurement of U.S. equities while incorporating ESG (Environment, Social, and Governance) factors.¹ The index maintains similar industry weights to the S&P 500 while implementing stricter ESG eligibility criteria.

A common misconception is that all ESG indices remove or underweight sectors deemed environmentally damaging, such as Energy or Utilities. However, removing entire sectors may result in a shift in weight toward other sectors, potentially creating sector bias and concentration risk. Rather than excluding sectors, the S&P 500 ESG Leaders Index selects companies that perform highest when considering specific ESG metrics.

Exhibit 1 illustrates how the S&P 500 ESG Leaders Index maintains low active share in relation to the benchmark index, in each sector, with the sector active share at 6.41%, highlighting broad sector neutrality. However, using ESG metrics as the criteria to determine index inclusion will naturally result in deviations from the underlying index. This is particularly evident when a sector has several constituents deemed ineligible or a company with a high float market cap (FMC) is excluded. Typically, the more a methodology integrates stricter sustainability criteria, the greater the active share.

The S&P 500 ESG Leaders Index methodology selects constituents on a relative basis¹ within each GICS^® industry group, resulting in low active share within sectors. However, in certain instances, sectors may be over- or underweighted relative to the underlying index, causing deviation. This is illustrated by the active share at the index level reaching 41.15%, which is driven by both disparity in index constituents with the S&P 500, as mentioned previously, as well as weights (see Exhibit 1).

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The index selection process targets 50% of uncapped FMC from each GICS industry group in the S&P 500, selecting companies in decreasing order using S&P Global ESG Scores (see Exhibit 2). However, specific exclusions (such as exclusions based on specified business activities) may prevent an industry group from meeting the 50% target. This could be a result of the industry lacking enough eligible constituents or the FMC weight of eligible constituent weights not reaching the target.

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If this happens, excess industry weight is distributed proportionately among the remaining index constituents. If eligible constituents with higher FMC weighting are selected, any additional weight allocation may result in a sector overweight (see Exhibit 3). To prevent single-stock concentration, a constituent cap¹ is integrated as per the S&P 500 ESG Leaders Indices methodology.

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The S&P 500 ESG Leaders Index has provided a measurement of U.S. equities with an ESG lens and maintained similar industry group weights as the S&P 500. By utilizing index construction to maintain broad sector neutrality, the index historically reduced the impact of sector-driven performance, increased the impact of stock selection and produced low tracking error versus the S&P 500.³ Consequently, the success of the index is not solely measured through its performance but also by how closely its industry group weights—and, by extension, sector weights— remain similar to the S&P 500.

¹ See Rowton, Stephanie and Maria Sanchez, “The S&P 500 ESG Index: 5 Years of Defining Core Through an ESG Lens,” S&P Dow Jones Indices LLC, Aug. 7, 2024.

² A maximum single-company weight cap (5%, company weight in the S&P 500 ESG Index) is applied to the final index constituents.

³ Beyhan, Maya, “Understanding the Outperformance of the S&P 500 ESG Leaders Index through a Sectoral Lens,” S&P Dow Jones Indices’ Indexology^® Blog, Oct. 24, 2024.

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