What Are ESG ETFs?
ESG ETFs select and weight their holdings based on Environmental, Social, and Governance criteria alongside traditional financial metrics. They allow investors to align their portfolios with their values — avoiding companies that harm the environment, exploit workers, or demonstrate poor governance — while still pursuing competitive returns.
The "E" covers environmental factors: carbon emissions, resource depletion, pollution, deforestation, and climate risk. The "S" addresses social issues: labor practices, diversity and inclusion, community impact, data privacy, and human rights. The "G" evaluates governance: board composition, executive compensation, shareholder rights, transparency, and anti-corruption policies.
ESG ETFs have grown rapidly, with assets exceeding $300 billion. But the category has also attracted controversy, with debates about whether ESG investing improves returns, whether ESG ratings are meaningful, and whether excluding certain companies actually changes corporate behavior. Explore ESG fund options on our ESG ETF page.
How ESG ETFs Select Their Holdings
ESG ETFs use several different approaches, and understanding them is critical because not all "ESG" funds are equally rigorous:
Exclusionary Screening
The simplest approach: exclude companies involved in controversial industries. Common exclusions include tobacco, weapons, fossil fuels, gambling, and private prisons. This is the lightest form of ESG and results in a portfolio that closely resembles the broad market minus a few sectors.
ESG Integration
Funds that integrate ESG scores into their stock selection process, weighting toward companies with higher ratings. ESGU (iShares ESG Aware MSCI USA ETF) takes this approach, starting with the broad U.S. market and tilting toward companies with favorable ESG profiles while maintaining sector and market-cap exposure similar to the S&P 500.
Best-in-Class
Rather than excluding entire industries, best-in-class funds select the top ESG performers within each sector. This ensures sector diversification while rewarding companies that lead their industry on ESG metrics. Even the energy sector is represented — by its cleanest operators.
Thematic ESG
These funds focus on specific ESG themes like clean energy, water sustainability, or gender diversity. Examples include ICLN (iShares Global Clean Energy ETF) and SHE (SPDR SSGA Gender Diversity Index ETF). These are more concentrated and carry higher tracking error versus broad benchmarks.
Do ESG ETFs Perform Better or Worse?
This is the most asked question about ESG investing, and the honest answer is: it depends on the time period and the specific fund.
The bull case: ESG-screened companies tend to be higher quality. They manage risks better, face fewer regulatory penalties, and attract better talent. Over long periods, these advantages should translate into competitive or superior returns. Several academic studies support this view.
The bear case: Excluding entire sectors (like energy) means missing their rallies. In 2021-2022, traditional energy stocks surged while many ESG funds lagged because they had underweighted or excluded oil and gas companies. ESG constraints limit the investable universe, which theory suggests should reduce risk-adjusted returns.
The practical reality: most broad ESG ETFs have performed within a few percentage points of their conventional counterparts. The tracking error is generally small because ESG funds still hold most of the same large-cap stocks that drive market returns. You are unlikely to sacrifice meaningful performance by choosing an ESG fund, but you are also unlikely to gain a performance advantage.
Greenwashing: The ESG Labeling Problem
Greenwashing — marketing funds as sustainable without applying rigorous standards — is a genuine concern in the ESG ETF space. Some issues to watch for:
Loose screening criteria: Some "ESG" funds exclude very few companies, resulting in portfolios nearly identical to conventional indexes. If your ESG fund holds 490 of the S&P 500's 500 stocks, the ESG label is mostly marketing.
Inconsistent ratings: MSCI, Sustainalytics, and other rating agencies often disagree on the same company's ESG score. A company rated highly by one agency may score poorly with another. This lack of standardization makes it hard for investors to know what they are actually getting.
Sector mislabeling: Some ESG funds include fossil fuel companies that are "transitioning" to clean energy, or defense contractors with good governance scores. Whether this is pragmatic inclusion or greenwashing depends on your perspective.
To avoid greenwashing, read the fund's methodology, check the actual top holdings, and understand what criteria are used for inclusion and exclusion. A fund's name alone tells you very little about its actual ESG rigor.
Top ESG ETFs
ESGU (iShares ESG Aware MSCI USA ETF): Broad U.S. equity exposure with ESG integration. Holds about 300 stocks at 0.15% expense ratio. Closely tracks the S&P 500 with modest ESG tilts. Good for investors who want values alignment with minimal tracking error.
ESGV (Vanguard ESG U.S. Stock ETF): Uses exclusionary screening to remove companies involved in adult entertainment, alcohol, tobacco, weapons, fossil fuels, gambling, and nuclear power. Holds about 1,500 stocks at 0.09%. More aggressive exclusions than ESGU.
SUSA (iShares MSCI USA ESG Select ETF): Selects the top ESG-rated companies from each sector, resulting in about 180 holdings. More concentrated and potentially more differentiated from the broad market. Expense ratio: 0.25%.
VSGX (Vanguard ESG International Stock ETF): Applies Vanguard's exclusionary criteria to international stocks. Expense ratio: 0.12%. Good for investors who want global ESG coverage.
Should You Invest in ESG ETFs?
The decision ultimately comes down to your priorities. If aligning your investments with your values is important to you, ESG ETFs make this possible without significant performance sacrifice. They are not perfect — rating inconsistencies and greenwashing are real issues — but they represent a meaningful step toward values-based investing.
If performance is your sole concern, traditional index ETFs offer slightly lower fees and broader diversification. The performance difference between ESG and conventional funds is typically small in either direction, so neither choice is clearly financially superior.
A practical approach: use an ESG fund for your core U.S. equity allocation (replacing VOO with ESGU or ESGV) and see how it feels. If the holdings and methodology align with your values, keep it. If you find the ESG criteria too loose or too strict for your preferences, you can always switch back to a conventional index ETF. Browse all your options on our ETF directory and use the comparison tool to evaluate ESG funds against their conventional counterparts.
