On June 3, 2025, STOXX and Intercontinental Exchange (ICE) introduced the STOXX ICE Fixed Income Sustainability Indices, a suite of benchmarks designed to align bond investments with Paris Agreement climate goals. Responding to rising demand for climate-focused fixed income solutions, the indices cover investment-grade bonds in USD, EUR, and GBP, as well as high-yield bonds in USD and EUR. Compliant with EU Paris-Aligned Benchmarks (PAB) and Climate Transition Benchmarks (CTB), they achieve at least 50% and 30% reductions in GHG emissions intensity, respectively, with 7% annual decarbonization. By prioritizing SBTi-validated firms and green revenues, can these indices drive sustainable capital flows, or will market adoption face hurdles?

Index Features and Methodology

• Scope: Includes investment-grade and high-yield bonds, tracking $10T in global fixed income assets, per ICE estimates.

• Climate Alignment:

• PAB: ≥50% GHG intensity reduction vs. parent indices, 7% annual decarbonization, per EU regulations.

• CTB: ≥30% GHG intensity reduction, with similar decarbonization targets.

• Construction:

• Overweights companies with SBTi-approved GHG targets (covering 40% of index constituents).

• Targets a 2:1 green-to-brown revenue ratio, favoring renewable energy over fossil fuels.

• Excludes firms violating UN Global Compact, SDGs, or involved in controversial weapons, tobacco, or coal (10% of market excluded).

• Optimizes turnover (5-10% annually) to mirror parent index performance, per STOXX.

• Roles: STOXX provides sustainability data and administration; ICE handles pricing, reference data, and calculations.

“These indices meet growing demand for sustainable bonds,” said STOXX’s Axel Lomholt.

ICE’s Chris Edmonds added, “Our combined expertise creates powerful benchmarks.”

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Strategic Context

Aligns with climate finance trends:

• Swiss Glacier Collapse: 1.5°C warming underscores urgent decarbonization needs.

• IFC’s $100M TPG Investment: Climate solutions in emerging markets complement fixed income strategies.

• Energize Capital’s $430M Fund: Digital climate tech parallels indices’ focus on green innovation.

• IFRS S2 Disclosures: GHG intensity metrics support transparent emissions reporting.

Challenges and Risks

• Market Adoption: Only 5% of $100T global bond assets are sustainability-focused, per Bloomberg, limiting initial uptake.

• Data Gaps: 30% of bond issuers lack SBTi targets or green revenue data, risking index accuracy, per STOXX.

• Performance Trade-offs: Exclusions and optimization may underperform broader indices by 0.5-1% annually, per ICE simulations.

• Policy Risks: U.S. deregulation, like $1.5B Army Corps cuts, may weaken ESG incentives, affecting 10% of global bond flows.

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What’s Next?

STOXX and ICE plan to expand the suite to cover $15T in assets by 2027, adding emerging market and corporate bond indices. A $5M data partnership with MSCI will enhance SBTi and green revenue metrics in 2026. Global sustainable bond markets could reach $5T by 2030, per BloombergNEF. The indices aim to redirect $500B to low-carbon assets by 2030, per STOXX projections.

“This collaboration scales sustainable investing,” said Lomholt.

With 36 Gt CO2 emitted in 2024, these indices could cut 0.2 Gt annually via capital reallocation. Will they reshape fixed income markets, or face adoption barriers?

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