ESG Fund Name Changes and Their Impact on Investment Flows: ESMA Analysis

Understanding ESG Fund Name Changes in European Markets

ESG fund name changes have become one of the most consequential trends reshaping European asset management over the past decade. A landmark study published by the European Securities and Markets Authority (ESMA) in April 2025 provides the most comprehensive analysis to date of how fund naming conventions influence investment flows across the European Union. The research, authored by Adrien Amzallag, Nils Brouwer, Julien Mazzacurati, and Federico Piazza, examines data spanning from 2009 to mid-2024 covering over 71,000 UCITS and Alternative Investment Funds.

The findings reveal a striking reality: the simple act of adding an ESG-related term to a fund’s name can trigger substantial capital inflows, raising important questions about investor behavior, market efficiency, and the potential for greenwashing. Between 2018 and 2024, approximately 1,834 EU funds—representing around 2.5% of the entire fund universe—changed their names to incorporate ESG-related terminology. This wave of rebranding coincided with growing investor demand for sustainable investment products and an evolving regulatory landscape designed to protect investors from misleading claims.

The proportion of funds carrying ESG-related names has grown dramatically, rising from less than 3% before 2015 to approximately 9% by mid-2024. For UCITS specifically, this figure reached an impressive 15%, underscoring the extent to which sustainability branding has permeated the retail investment landscape. Understanding the dynamics behind these ESG fund name changes is essential for investors, regulators, and asset managers navigating the complex intersection of sustainable finance and sovereign asset management strategies.

ESMA Guidelines on ESG Fund Names Explained

The regulatory framework governing ESG fund name changes centers on ESMA’s Guidelines on funds’ names using ESG or sustainability-related terms. These guidelines were developed to address growing concerns about funds using sustainability-related language that may not accurately reflect their investment strategies or holdings. The core objective is to specify circumstances where fund names using ESG terminology become unfair, unclear, or misleading to investors.

At the heart of the guidelines lies an 80% investment threshold. Funds that use ESG or sustainability-related terms in their names must ensure that at least 80% of their investments are directed toward meeting the ESG characteristics or sustainability objectives they claim to pursue. This quantitative requirement creates a meaningful barrier against superficial greenwashing, forcing fund managers to align their portfolios with the promises embedded in their names.

The guidelines also establish universal exclusions that apply to all funds using ESG or sustainability-related names. These include mandatory exclusion of companies involved in controversial weapons, the cultivation and production of tobacco, and entities found in violation of the UN Global Compact Principles or the OECD Guidelines for Multinational Enterprises. These baseline exclusions ensure a minimum level of responsible investment practice across all ESG-branded funds.

ESMA’s framework categorizes ESG fund names into three distinct groups. Category 1 covers social and governance-related terms such as “social,” “equality,” and “governance,” along with transition-related language requiring demonstration of a clear and measurable path to transition. Category 2 encompasses environmental and impact-related terms including “green,” “environmental,” and “climate,” as well as broader ESG and SRI abbreviations. Funds using impact-related terms must further demonstrate positive and measurable impact. Category 3 targets sustainability-related words directly derived from “sustainable,” which face the most stringent requirements including fossil fuel revenue exclusions and commitments to invest meaningfully in sustainable investments.

How ESG Fund Name Changes Drive Investment Flows

The central finding of ESMA’s research confirms what many in the industry have long suspected: ESG fund name changes have a significant and measurable impact on investment flows. Using a panel event-study framework covering 1,554 instances of ESG term additions to UCITS fund names between 2016 and 2024, the researchers found that adding an ESG-related term triggers substantial net inflows during the five quarters following the name change.

The effect is most pronounced immediately around the event. In both the quarter of the name change (quarter 0) and the following quarter (quarter +1), funds experience an increase in net inflows equivalent to 2.2% of assets under management. This initial surge demonstrates how quickly investors respond to ESG signaling through fund names. The flow effect then stabilizes at a still-significant level of approximately 1.3% to 1.4% of AuM per quarter through quarters +2 to +5.

Cumulatively, the first-year impact amounts to an 8.9% increase in net inflows as a share of AuM—a remarkable figure that underscores the commercial power of ESG branding in fund management. This estimate is slightly below the 10-15% range reported by earlier academic studies, though the broader dataset and more rigorous methodology employed by ESMA lend confidence to these results. Importantly, the researchers found no statistically significant pre-event trends, meaning that funds were not already experiencing unusual inflows before their name changes, which strengthens the causal interpretation of the findings.

These results carry profound implications for the asset management industry. Fund managers face strong financial incentives to incorporate ESG terminology into their products, as the rebranding alone can attract nearly 9% in additional capital within a single year. This dynamic creates a competitive pressure that, without proper regulatory guardrails, could encourage cosmetic sustainability claims rather than genuine portfolio changes. For investors seeking to understand how digital financial innovation intersects with regulatory policy, these findings highlight the critical role that naming conventions play in capital allocation.

The 8.9% Inflow Effect: Measuring ESG Fund Name Impact

To quantify the impact of ESG fund name changes on investment flows, ESMA employed a rigorous econometric approach using Ordinary Least Squares estimation with robust standard errors clustered at the fund level. The dependent variable was cumulative net flows during each quarter, expressed as a percentage of total assets under management. Positive values indicate net inflows while negative values represent net outflows.

The event-study design centered on a binary variable that equals one when a fund includes an ESG term in its name for the first time in a given quarter. The temporal analysis window spans eleven dummy variables: five for quarters preceding the name change, one for the quarter of the change itself, and five for subsequent quarters. The quarter immediately before the name change serves as the reference period, with its coefficient normalized to zero by construction.

The model incorporates a comprehensive set of control variables to isolate the ESG naming effect from other factors that influence fund flows. These include fund performance measured by percentage returns over the trailing 12 months, fund size captured through the natural logarithm of total assets under management, and fund age represented by a binary variable indicating whether the fund launched before January 2015. Additional controls for portfolio carbon intensity and ESG risk ratings from Morningstar-Sustainalytics further enhance the model’s ability to distinguish naming effects from genuine sustainability characteristics.

Fund fixed effects capture unobservable time-invariant characteristics specific to each fund, while time fixed effects account for market-wide shocks affecting all funds simultaneously. This dual fixed-effect structure ensures that the estimated naming effect is not confounded by persistent fund-level traits or broad market trends. The robustness of these findings was confirmed through multiple sensitivity analyses, including separate estimation for the 2016-2020 and 2020-2024 periods and exclusion of particularly popular keywords like “ESG” and “Sustainability.”

Environmental Terms Lead ESG Fund Name Adoption

When ESMA disaggregated the analysis by ESG category, a striking pattern emerged: environmental terms dominate both the adoption trend and the investment flow impact. Funds adding environmental-related terms to their names experienced a cumulative inflow increase of approximately 16% of AuM over the first year—nearly double the aggregate effect of 8.9%. The impact was statistically significant at the 1% level across most post-event quarters, with the strongest effects of 3.66% and 3.67% observed in the quarter of the change and two quarters afterward, respectively.

The dominance of environmental terminology reflects broader market dynamics. Since 2012, the term “ESG” itself has risen consistently, representing about 40% of all ESG-related words added to fund names after 2021. Meanwhile, the landscape of ESG terminology has consolidated significantly. Before 2012, a diverse “others” category containing approximately 30 unique terms—including “earth,” “solidarity,” “diversity,” and “ecology”—accounted for over 50% of ESG-related terms added to fund names. By 2021, this category had declined to just 13%, reflecting a standardization around a smaller set of widely recognized environmental and ESG terms.

The research based on 585 instances of environmental term additions reveals that investor appetite for environmentally branded products significantly outstrips demand for other ESG categories. Terms such as “green,” “climate,” “transition,” and “impact” were rarely used before 2015 but collectively grew to account for approximately 5% of all ESG-related name changes between 2018 and 2021. The environmental focus aligns with growing public awareness of climate change and regulatory initiatives like the European Green Deal that have placed environmental sustainability at the center of the investment discourse. These trends are reshaping how investors evaluate opportunities across global investment landscapes.

Social and Governance ESG Fund Name Changes Show Limited Impact

In contrast to the powerful effect of environmental terms, social and governance ESG fund name changes show no consistent evidence of driving meaningful investment flows. Across 426 instances of social or governance term additions analyzed in the study, none of the post-event quarterly coefficients achieved conventional levels of statistical significance. The quarter-of-change coefficient was just 0.99%, and subsequent quarters showed mixed results including negative coefficients in quarters +2 and +3.

This asymmetry between environmental and social/governance naming effects carries important implications for the asset management industry. Fund managers seeking to attract capital through ESG rebranding appear to face significantly different incentive structures depending on which dimension of ESG they emphasize. While environmental branding yields substantial and persistent inflows, social and governance language offers no measurable commercial advantage in terms of capital attraction.

Sustainability-related terms—those directly derived from “sustainable”—also showed limited impact on investment flows. Based on 380 instances of sustainability term additions, only one post-event quarter (quarter +4) achieved statistical significance, and only at the 10% level. The lack of a consistent pattern suggests that investors may perceive “sustainability” as a broader, less actionable label compared to specific environmental commitments like climate or green investing.

These findings raise important questions about the effectiveness of the three-category framework established in ESMA’s guidelines. While the regulatory structure treats all three categories with similar rigor, the market response varies dramatically. This disconnect suggests that greenwashing risks may be concentrated primarily in environmental branding, where the financial incentives to mislead investors are strongest. Regulators may need to consider whether additional scrutiny of environmental claims is warranted given the disproportionate capital flows these terms attract.

ESG Fund Name Changes Across UCITS and AIFs

The adoption of ESG fund name changes varies significantly between UCITS and Alternative Investment Funds, reflecting fundamental differences in these fund categories’ investor bases, regulatory frameworks, and market positioning. UCITS, which primarily serve retail investors, have embraced ESG terminology far more aggressively than AIFs. By mid-2024, approximately 15% of all UCITS carried ESG-related names, compared to a lower proportion among AIFs.

The EU fund landscape has grown substantially over the study period. Total UCITS expanded from 24,973 funds in 2009 to 27,512 by mid-2024, while AIFs experienced even more dramatic growth from 19,889 to 44,142 over the same period. The combined fund universe reached 71,654 funds by mid-2024, providing a vast dataset for analysis. Equity UCITS represented the largest subcategory at 10,837 funds, followed by mixed-asset UCITS at 7,712 and bond UCITS at 6,971.

The sharp growth in ESG-named UCITS that began around 2015 was curtailed in mid-2021, coinciding with the application of the Sustainable Finance Disclosure Regulation and heightened regulatory scrutiny of sustainability claims. A similar but more muted pattern was observed among AIFs. Notably, a small but growing number of funds began removing ESG words from their names starting in mid-2022, a trend that may reflect increased compliance costs under the new guidelines or a strategic retreat from sustainability claims that funds cannot substantiate.

The emergence of funds replacing one ESG term with another has also increased in recent quarters. This substitution effect suggests that fund managers are refining their sustainability branding in response to regulatory guidance, perhaps moving from broad ESG labels toward more specific environmental or impact-focused terminology. The evolution of naming strategies within the broader capital markets landscape demonstrates how regulatory pressure can reshape product positioning while maintaining investor interest.

Greenwashing Risks and ESG Fund Name Regulation

The substantial inflow effects documented by ESMA highlight a fundamental tension in sustainable finance: the stronger the commercial incentive to adopt ESG branding, the greater the risk of greenwashing. When adding an environmental term to a fund name can attract 16% in additional capital within a year, the temptation to engage in superficial rebranding without meaningful portfolio changes becomes significant. This is precisely the concern that ESMA’s guidelines seek to address.

ESMA’s Sustainable Finance Roadmap 2022-2024 identified greenwashing as a top priority, and the authority’s subsequent Progress Report on Greenwashing in May 2023 further documented the extent of misleading sustainability claims across European financial markets. The fund naming guidelines represent one of the most concrete regulatory responses to these concerns, establishing clear quantitative and qualitative criteria that funds must meet to use ESG terminology.

The universal exclusion requirements create a baseline standard that reduces the most egregious forms of greenwashing. By requiring all ESG-named funds to exclude controversial weapons manufacturers, tobacco producers, and companies violating international norms, the guidelines ensure that even the most loosely defined ESG label carries some substantive meaning. However, critics argue that these exclusions represent a relatively low bar that most mainstream funds would meet regardless of their sustainability credentials.

The additional requirements for sustainability-specific terms—including fossil fuel revenue thresholds and meaningful sustainable investment commitments—add further protection. Yet the effectiveness of these measures depends heavily on enforcement and the ability of supervisory authorities to verify compliance across thousands of funds. The Austrian Financial Market Authority’s December 2024 market study on sustainability aspects of retail funds provides one example of national-level scrutiny that complements ESMA’s EU-wide framework.

Looking ahead, the interaction between fund naming rules and the broader fintech and regulatory innovation landscape will likely determine whether these guidelines successfully curb greenwashing or merely shift it to more sophisticated forms.

Methodology Behind ESMA’s ESG Fund Name Research

The methodological rigor of ESMA’s research distinguishes it from earlier academic studies on ESG fund name changes and investment flows. The study drew on a comprehensive ECB dataset covering all EU-domiciled UCITS and AIFs from 2009 to mid-2024, providing quarterly records with fund names, domicile information, and legal status for approximately 71,000 funds after excluding roughly 4,000 with missing legal status data.

A key methodological innovation was the ESG term identification approach, based on the framework developed by Amzallag et al. (2023). Unlike many academic studies that rely solely on English-language keyword detection, this methodology includes ESG-related keywords across all major EU languages. Terms such as “durable” in French, “nachhaltig” in German, “duurzaam” in Dutch, “sostenibile” in Italian, “sostenible” in Spanish, and “vastuullinen” in Finnish are captured alongside their English equivalents. This multilingual approach is critical given the diversity of European fund markets and avoids systematic undercounting of ESG-named funds in non-English-speaking jurisdictions.

The flow data used in the econometric analysis was sourced from Morningstar Direct, providing quarterly net flow figures for UCITS funds. Additional data from Morningstar-Sustainalytics supplied portfolio carbon intensity scores and ESG risk ratings used as control variables. The combination of regulatory datasets (ECB), commercial flow data (Morningstar Direct), and sustainability metrics (Sustainalytics) creates a uniquely comprehensive analytical foundation.

The panel event-study design addresses several common identification challenges. Fund fixed effects control for time-invariant characteristics that might correlate with both ESG naming decisions and flow patterns. Time fixed effects absorb aggregate market conditions. The inclusion of performance, size, age, carbon intensity, and ESG risk controls further isolates the naming effect. The absence of significant pre-event dummies strongly supports a causal interpretation, suggesting that funds were not experiencing unusual flow patterns before their name changes.

Future Implications for ESG Fund Names and Investor Protection

The ESMA research on ESG fund name changes and their impact on investment flows carries far-reaching implications for the future of sustainable finance in Europe and beyond. As the regulatory framework continues to evolve, several key developments are likely to shape how fund naming conventions interact with investor behavior and capital allocation.

First, the documented 8.9% inflow effect confirms that fund names serve as powerful marketing tools in the ESG space. This finding reinforces the importance of ESMA’s guidelines as a proportionate regulatory response to a genuine market dynamic. Without naming rules, the financial incentives to adopt ESG branding would continue to grow, potentially outpacing the ability of investors to verify underlying sustainability credentials.

Second, the stark difference between environmental and social/governance naming effects suggests that regulatory attention may need to be calibrated accordingly. While the guidelines apply broadly across all ESG categories, the greenwashing risk is clearly concentrated in environmental branding, where investor appetite—and thus the incentive to mislead—is strongest. Future regulatory refinements might introduce differentiated scrutiny levels based on the magnitude of demonstrated investor response to different ESG categories.

Third, the emerging trend of funds removing ESG terms from their names signals a potential market correction as compliance costs rise under the new guidelines. This “de-ESG-ification” trend may actually serve investor protection by eliminating funds that cannot substantiate their sustainability claims. However, it also risks creating confusion if investors interpret name removals as a rejection of sustainability principles rather than a regulatory compliance adjustment.

The study’s temporal findings—showing consistent effects across both the 2016-2020 and 2020-2024 periods—suggest that investor sensitivity to ESG branding is not a passing trend but a structural feature of European capital markets. As climate concerns intensify and regulatory frameworks mature, the relationship between fund names, investment flows, and genuine sustainability outcomes will remain at the center of European financial policy.

For asset managers, the message is clear: ESG fund names carry real commercial value, but that value comes with increasing regulatory obligations and reputational risks. For investors, the research underscores the importance of looking beyond fund names to understand the actual investment strategies and holdings that determine whether a fund’s sustainability credentials are genuine. And for regulators, the ESMA findings provide an empirical foundation for continued refinement of the rules governing how funds communicate their ESG commitments to the market.