Preference vs. Performance: Investing in ESG With RAFI Indices

In a wide-ranging conversation on Treussard Talks, host Jonathan Treussard sat down with Ari Polychronopoulos, head of RAFI™ Indices at TMX VettaFi, to dissect the evolution of index strategies. Among the topics discussed was environmental, social, and governance (ESG) investing. It’s an investment theme that surged in popularity before facing widespread investor skepticism and political backlash.Driven by rapid institutional capital inflows in the late 2010s and early 2020s, ESG investing grew into a multi-trillion-dollar industry. Asset managers promised that ESG screening would deliver both societal impact and market outperformance. However, critics accused fund managers of “greenwashing” by placing ESG labels on traditional funds without driving real change. In effect, this breached their fiduciary duty to prioritize risk-adjusted financial returns while using client capital to force corporate social policies outside of the proper political channels. The friction ultimately triggered significant capital divestments from certain pension funds. This led major financial institutions to scale back public commitments to climate coalitions.Key Takeaways: ESG strategies are best understood as preference-based investment frameworks. They are not empirical return drivers that systematically generate excess market returns. By evaluating companies based on qualitative and quantitative sustainability, ESG overlays allow investors to align capital with specific values. The performance of an ESG allocation remains fundamentally tied to its underlying portfolio construction methodology. See More: Head of RAFI Indices Discusses 20 Years of Fundamental IndexingESG as Preference, Not Performance DriverDespite recent history, ESG investing remains an important part of many investors’ portfolios. There are still a number of investors who want to merge ESG initiatives with investment goals. ESG Today noted a survey of institutional and wholesale investors (a combined $35 trillion in assets under management among survey respondents) from Robeco. Sixty-six percent of respondents indicated that physical climate risks will have a tangible impact on assets prices over the next five years. 82% expect the impact will occur over the next 10 years. Additionally, Morgan Stanley noted that global individual investor interest in sustainable investing reached 92% in 2026, which is up from 88% in 2025. Firms have been rebranding their ESG initiatives, but there are varying ways to define ESG investing today. Ari offered a candid assessment of ESG’s core function: it is a preference-based investment strategy rather than an empirical factor designed to generate excess returns. “ESG is what I call a preference-based investment strategy,” Ari explained. “ESG, in and of itself, isn’t something that is going to provide you outperformance versus the standard market.” “I don’t subscribe to the fact that ESG is a factor, like value, or low volatility, or quality, where if you just buy companies that rate well based on ESG metrics that you’re gonna outperform," he added.Values vs. Alpha in ESG StrategyDuring the ESG boom of 2019–2020, investors were frequently sold on the narrative that they could “do well by doing good” in their investment portfolios. As Ari noted, expecting systematic alpha simply by screening for high ESG ratings conflates personal values with return drivers. When returns lagged expectations, many retail investors grew disillusioned. However, as the Robeco survey proved, ESG remains vital for large institutional allocators like public pension funds in the U.S. and Europe. These large funds require customized frameworks to align capital with specific mandate preferences.Rating Complexity & Index MechanicsGiven the previous backlash, how should investors approach ESG moving forward? A primary source of investor frustration stems from a lack of transparency regarding how ESG strategies are built. “Part of the backlash, too, I think, is the fact that people don’t understand what it is they’re buying,” Ari observed. “Really digging into an ESG rating is a lot of work, and there’s a lot of different companies that provide ESG ratings, which basically are a composite measure looking at hundreds of qualitative and quantitative metrics.” Additionally, Ari emphasized that an ESG overlay’s financial performance remains tied to its underlying portfolio construction methodology. Essentially, a closer look under the hood is a prerequisite when considering ESG exposure such as through ETFs. For example, investors who are seeking ESG principles through a fund that decouples price from stock selection and weighting, the PIMCO RAFI ESG U.S. ETF (RAFE B) can provide this exposure. By tracking the RAFI ESG U.S. Index, RAFI supplements traditional sustainability metrics with quantitative expected return drivers like financial discipline and workforce diversity. RAFI provides a rules-based strategy that pursues both social responsibility and outperformance over the long-term investment horizon. “You need to also look at the underlying investment methodology,” he added. “If you buy an ESG ETF that is cap weighted, you should probably expect your return to be about the same as the market. If you’re buying an ESG ETF that is based on the RAFI approach, you should expect your outperformance to be similar to RAFI.”Realism & Trade-Offs in Capital MarketsTreussard and Ari agreed that financial markets are increasingly being asked to resolve societal issues that extends beyond their primary function. This includes tackling topics such as climate change and economic inequality. Treussard noted that capital markets serve as powerful engines for compounding enterprise value, but attempting to use investment portfolios as a surrogate for public policy often leads to disappointment. “We are asking capital markets to solve for, fill in the blank, climate change, inequalities in our society,” Treussard remarked. “That’s just asking a lot.” For more news, information, and strategy, visit the Smart Beta Content Hub. VettaFi LLC (“VettaFi”) is the index provider for RAFE, for which it receives an index licensing fee. However, RAFE is not issued, sponsored, endorsed, or sold by VettaFi, and VettaFi has no obligation or liability in connection with the issuance, administration, marketing, or trading of RAFE.