Sustainable Funds Outperformed Traditional Peers in First Half 2026: Morgan Stanley

Sustainable funds outperformed traditional peers with a median return of 4.9 percent versus 4.0 percent in the first half of 2026, according to Morgan Stanley Institute for Sustainable Investing's Sustainable Reality report, which tracks nearly 99,000 global funds using Morningstar data. Assets under management in sustainable funds reached a new high of $4.24 trillion at the end of June 2026, up 4.8 percent from December 2025, though sustainable funds' share of total AUM fell to 6.1 percent, down from a peak of 7.2 percent in June 2023.

 

Why Asset Allocation, Not Sustainability Screening, Explains Most of the Outperformance

 

The report attributes sustainable funds' return advantage substantially to their portfolio composition rather than to sustainability criteria themselves improving stock selection. Sustainable funds hold a considerably higher weighting to equities, 56 percent of the universe versus 41 percent for traditional funds, and equities were the strongest-performing asset class in the period. Within equities specifically, sustainable funds' median return of 9.0 percent only modestly exceeded traditional equity funds' 8.6 percent, a gap of 40 basis points, while sustainable fixed income funds returned -1.3 percent, more than 250 basis points behind traditional fixed income funds at +1.3 percent.

That breakdown matters for interpreting the headline outperformance figure accurately: since sustainable funds are simply weighted more heavily toward the asset class that happened to perform best this period, much of their overall return advantage reflects that allocation difference rather than sustainability-focused stock or bond selection outperforming comparable non-sustainable holdings within the same asset class. The report's own data shows the equity-specific outperformance was modest, and fixed income sustainable funds notably underperformed their traditional counterparts, a detail that qualifies the "outperformance" headline considerably once broken down by asset class.

 

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Why the Widening AUM-Versus-Inflow Gap Signals a Specific Market Dynamic

 

Sustainable funds' AUM share of the total market has declined from 7.2 percent to 6.1 percent since December 2023, despite absolute AUM continuing to grow, reaching a new high in dollar terms. The report explains this apparent contradiction directly: sustainable fund growth "has grown steadily in absolute terms since 2022... driven by both inflows and returns in 2022–2024 but more recently driven mostly by returns, with outflows in 2025 and small inflows in 1H 2026," while traditional funds have "consistently recorded stronger net inflows over that period."

That distinction between growth driven by investment returns versus growth driven by genuine new capital inflows matters considerably for assessing investor sentiment toward sustainable investing specifically, since a fund category growing primarily because its existing holdings appreciated in value, while simultaneously losing relative market share to more strongly growing traditional funds, indicates existing sustainable fund investors are broadly staying invested and benefiting from returns, but relatively few new investors are choosing to allocate additional new capital specifically into sustainable funds compared with traditional alternatives.

 

Why the Article 8 Versus Article 9 Flow Divergence Reveals Different Investor Conviction Levels

 

Under the EU's Sustainable Finance Disclosure Regulation, Article 8 funds "promote environmental or social characteristics" while Article 9 funds have "sustainable investment as their primary objective," representing a meaningfully stronger sustainability commitment. The report shows Article 8 funds received $242.2 billion in inflows during the first half of 2026, while Article 9 funds recorded flows of essentially zero, following what the report describes as "a ten-quarter run of outflows stretching back to 4Q 2023."

That stark divergence, strong inflows into the less stringent Article 8 category against a decade-plus of net outflows only just stabilising for the more stringent Article 9 category, suggests investors have grown considerably more cautious about committing capital to funds making the strongest, most binding sustainability commitments specifically, a pattern that could reflect several factors including regulatory scrutiny of Article 9 fund classifications following earlier controversies over sustainability claim accuracy, or genuine investor preference shifting toward funds offering sustainability considerations alongside more flexible, less restrictive investment approaches.

 

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Why Regional Performance Patterns Reversed a Previously Identified Underperformance Driver

 

The report specifically notes that sustainable funds' historically heavier allocation to Global and Europe investment areas, 69 percent of sustainable funds compared with 39 percent for traditional funds, "was a key driver of relative underperformance" in prior periods, but that in 1H 2026, "sustainable funds still outperformed traditional funds in both regions" despite those regions posting comparatively weaker median returns than Americas and APAC. That shift matters for understanding this period's specific outperformance drivers: rather than sustainable funds succeeding by having shifted their regional allocation toward better-performing regions, they instead achieved genuine outperformance within their existing heavy Europe and Global allocation, with additional outperformance in the Americas and APAC regions compounding that base advantage rather than driving it entirely alone.

 

What the Restriction Screening Data Reveals About European Versus Other Regional Approaches

 

The report's restriction screening data shows European-domiciled funds apply exclusionary screens, such as controversial weapons, thermal coal or tobacco, at rates dramatically higher than North American or Asian-domiciled funds. Controversial weapons exclusions apply to 68.8 percent of European AUM compared with just 0.9 percent of North American AUM and 3.5 percent of Asian AUM, with thermal coal exclusions showing a similarly stark gap at 55.7 percent of European AUM versus 0.5 percent in North America. That regional disparity illustrates that "sustainable" fund classification and restriction screening practices vary enormously by domicile region, meaning a sustainable fund's actual investment restrictions and exclusions can differ substantially depending on where it is domiciled, independent of its underlying sustainability classification alone.

 

Source: Morgan Stanley