The Sustainable Fund Boom Is Ending. What Replaces The ESG Label?
European asset managers launched only 13 sustainable funds in the second quarter of 2026 and closed 64. A year earlier, they had introduced 35 new products. The contraction does not show that investors have abandoned climate risk or environmental investment, but it does show that managers can no longer rely on a broad ESG label to make a fund commercially credible.
Performance concerns, investor withdrawals and stricter naming rules have exposed products that combined expansive sustainability claims with conventional portfolios. Managers now have to explain which economic transition they intend to finance, how the strategy selects securities and what role sustainability plays in expected returns.
Many firms have responded by narrowing the proposition. Instead of packaging several environmental, social and governance objectives into one fund, they are building products around energy infrastructure, grid investment, climate adaptation, water security, industrial efficiency and transition finance. The new funds often sound less idealistic because managers describe the exposure through capital expenditure, regulation, supply shortages and corporate cash flows.
Sustainable investing has not disappeared. Fund managers are rebuilding it as a collection of more specific investment strategies.
The Product Pipeline Has Contracted
Asset managers expanded their sustainable ranges rapidly when investors directed large volumes of capital towards ESG funds. Many firms launched active equity strategies, index products and specialist thematic funds within a short period, often using similar exclusions and corporate sustainability ratings.
The market could not support every product. Some funds remained too small to operate economically, while others struggled to distinguish themselves from conventional global equity portfolios. Investors also questioned whether higher fees paid for meaningful portfolio construction or simply for an ESG screen applied to familiar holdings.
Poor performance in several prominent environmental sectors intensified that scrutiny. Renewable-energy companies faced higher financing costs, supply-chain pressure and slower project development, while oil producers and defence companies delivered returns that many sustainable portfolios had deliberately excluded.
The problem did not originate from sustainability itself. Fund managers often placed several different investment ideas under one label and expected investors to treat them as one coherent category. A low-carbon global equity fund, a clean-energy technology fund and a green-bond portfolio may all carry a sustainability classification, but they have different return drivers, valuation risks and roles within a portfolio.
When results diverged, the ESG label offered little help in explaining why.
Regulation Has Made Broad Claims Harder To Maintain
European regulators have tightened the conditions under which funds can use environmental, sustainability, impact and transition-related terms in their names. Managers must now support those words with defined portfolio commitments, exclusions and investment policies rather than treating them as general marketing language.
The rules have prompted hundreds of funds to change their names. Some managers adjusted portfolios, but many removed ESG or sustainability terminology instead because the existing strategy could not meet the required threshold or exclusions without changing its investment universe.
A renamed fund does not necessarily become less sustainable. The manager may continue to integrate environmental risks, engage with companies or apply sector exclusions. The name change often reveals that those practices did not define the portfolio strongly enough to justify the original label.
Investors should therefore avoid reading a rebrand as either proof of greenwashing or evidence that sustainability has ceased to matter. The change may reflect a more accurate description of what the fund has always done.
The rules have nevertheless raised the commercial cost of launching a new sustainable product. Managers need stronger data, clearer documentation and a portfolio that can withstand regulatory and investor scrutiny. They also face the risk that changing political priorities, taxonomies or exclusion standards will force another redesign.
Firms now have less incentive to launch a fund simply because a sustainability theme attracts attention. They need a durable investment mandate.
Passive Funds Have Held Up Better
European passive sustainable funds attracted around $11 billion during the second quarter, while active products recorded approximately $7.8 billion in outflows. Investors did not reject sustainability uniformly; they favoured lower-cost products with more transparent portfolio rules.
An index-based fund usually tells investors which benchmark it follows, which exclusions it applies and how the methodology selects or weights companies. Investors may disagree with those choices, but they can examine them without relying entirely on a manager’s qualitative judgement.
Active sustainable funds have to demonstrate an additional source of value. A manager who charges more must show how research into transition plans, physical climate risks, governance or capital allocation can improve security selection. General statements about integrating ESG factors no longer provide enough differentiation because most large asset managers already claim to consider financially material sustainability risks.
Active management can still play an important role where benchmarks rely on historical data, company reporting remains inconsistent or transition outcomes depend on management decisions. The manager must connect that research to portfolio construction rather than presenting engagement and analysis as separate evidence of virtue.
Investors should be able to see why the fund owns a company, what would cause the manager to sell it and how the sustainability thesis supports the expected return.
Fixed Income Gives Sustainability A Clearer Function
Sustainable fixed-income strategies have also proved more resilient than many active equity funds because bonds allow managers to connect capital with a defined financing purpose.
A green bond may finance renewable-energy capacity, building efficiency, clean transport or water infrastructure. A sustainability-linked bond can alter its coupon when the issuer fails to meet agreed targets. Investors can assess the issuer’s credit quality and then examine whether the financing framework, reporting and targets justify the environmental claim.
The structure does not eliminate greenwashing risk. Issuers may allocate proceeds to projects they would have financed anyway, choose weak performance targets or report impact selectively. Bond investors still need to examine the legal documentation, use of proceeds and financial consequences attached to missed targets.
Fixed income nevertheless offers a more direct relationship between the security and the sustainability objective than a diversified equity fund that owns companies partly because they receive favourable third-party ratings.
The asset class also lets investors address climate risk without making a concentrated bet on high-growth environmental technology companies. A portfolio can hold government, infrastructure, utility and corporate debt across different maturities and credit qualities, giving the manager more tools to control duration and volatility.
Narrower Themes Are Replacing The ESG Umbrella
Fund managers increasingly describe new strategies through the economic problem they address rather than the ESG category they satisfy.
Energy-security funds invest in electricity networks, storage, generation and supporting infrastructure because economies need more reliable power. Climate-adaptation strategies target companies that help cities, businesses and agricultural systems manage heat, flooding, water shortages and other physical risks. Industrial-efficiency funds invest in automation, insulation, cooling, power management and materials that reduce resource consumption.
These themes can appeal to investors who would not choose a broad ESG product. They connect sustainability with infrastructure demand, regulation, national security and corporate spending rather than asking the investor to adopt one set of environmental and social preferences.
The narrower mandate also improves analysis. A grid-infrastructure fund can estimate capital expenditure, permitted returns, equipment demand and project pipelines. A broad ESG fund may hold technology, healthcare and consumer companies that share a favourable sustainability score but respond to entirely different economic conditions.
Specificity does not guarantee good performance. Popular themes can attract capital faster than companies can grow earnings, while specialised portfolios often carry high concentration and valuation risk. A fund labelled climate adaptation may also include businesses with only a small share of revenue linked to the theme.
Managers still need to prove that the holdings provide meaningful exposure rather than a marketable collection of adjacent companies.
Transition Finance Requires More Judgement
Transition strategies create one of the most difficult product-design questions because they may invest in companies that currently produce substantial emissions.
A cement producer, airline or energy group cannot qualify as environmentally advanced simply because management has published a distant net-zero target. At the same time, excluding every high-emitting company prevents investors from financing changes in the sectors that need the most capital.
A credible transition fund needs to distinguish between companies reducing emissions through measurable investment and companies using future commitments to protect their existing business model. Managers should examine current capital expenditure, technology choices, interim targets, governance and the financial assumptions behind the plan.
They should also define what happens when progress falls behind schedule. A fund that continues holding every issuer regardless of delivery turns transition into a permanent classification rather than an investment thesis.
Transition funds will rarely offer the simplicity of a strict exclusion strategy. Their value depends on disciplined research, transparent milestones and a willingness to change the portfolio when evidence changes.
Investors Need To Look Beyond The Fund Name
The next generation of sustainable products may use terms such as resilience, transition, infrastructure, security or resource efficiency. Those names can describe genuine investment exposures, but they can also give an old portfolio a more fashionable presentation.
Investors should begin with the holdings and portfolio rules. A thematic fund should derive a meaningful share of its exposure from the stated theme, while its methodology should explain how the manager measures that connection. Broad revenue thresholds can admit diversified companies whose involvement remains peripheral.
Concentration also matters. A narrow environmental theme may depend on a small number of equipment manufacturers, utilities or industrial companies. Investors need to understand whether they are buying a diversified structural trend or a volatile sector position.
Fees deserve the same scrutiny. A thematic label does not justify active-management pricing when the strategy follows a simple, replicable screen. An active manager should show how research, engagement and security selection change the portfolio and support better risk-adjusted returns.
Investors should also decide what they expect the fund to achieve. A portfolio designed to reduce financed emissions may not deliver measurable environmental impact. An impact fund may accept higher tracking error or invest in less liquid markets. A transition strategy may hold companies that appear unsuitable under a static ESG screen.
Clear objectives make those trade-offs easier to evaluate.
Sustainable Investing Is Becoming Part Of Mainstream Analysis
Climate risk will continue to affect insurance costs, agricultural output, infrastructure spending, energy systems and government finances even when fund managers stop using ESG in product names. Companies will still face carbon prices, physical disruption, changing regulation and pressure to replace inefficient assets.
Portfolio managers increasingly treat those developments as financial variables rather than as a separate ethical overlay. They analyse whether a utility can finance grid upgrades, whether an industrial company can protect margins during its transition and whether a property portfolio can remain insurable under more extreme weather conditions.
This integration may reduce the number of funds marketed explicitly as sustainable. It could also make sustainability analysis more economically relevant because managers must connect each claim to earnings, balance sheets and asset values.
The sustainable-fund boom encouraged asset managers to launch too many products before the market had agreed on what the category should contain. Closures and rebrands now mark a period of consolidation rather than a clean retreat.
Managers that continue to compete in the sector will need to offer funds with a clear exposure, credible portfolio rules and an investment case that survives beyond the label. Investors may see fewer launches, but the products that remain should become easier to understand—and harder to market without substance.