When we wrote about sustainable emerging market bonds in October 2025, our central argument was structural. A widening development finance gap, improving sovereign credit fundamentals across much of the EM universe, and growing green, social, and sustainability bond issuance were collectively changing the risk and return profile of this asset class. That argument has not changed. What has changed is the external environment in which it must be tested.
The first quarter of 2026 brought three simultaneous pressures to EM fixed income exposures. First, the Middle East conflict created commodity price volatility and tighter financial conditions from late 2025 onward. Second, uncertainty from the US tariff escalation cycle of 2025 continued to weigh on trade-exposed markets. Third, the IMF revised its growth forecast for emerging markets downward, to 3.9% for 2026, from 4.2% in January. The IMF's April 2026 Global Financial Stability Report described financial markets as being "challenged by the war in the Middle East," while noting that the system had remained resilient, without the sustained sell-offs or forced deleveraging seen in previous periods of stress. That resilience is real, but it depends on conditions remaining stable.
The question for institutional portfolios is not whether EM sustainable debt remains viable as an asset class. It does. The question is which exposures within that universe are structurally equipped to absorb external shocks, and which are not.
Dispersion Is the Key Condition
The EM sovereign universe is not uniform, and Q1 2026 conditions have sharpened the differences that were already visible in 2025. Commodity-exporting sovereigns with credible fiscal frameworks benefited from higher energy and metals prices driven by geopolitical supply disruption. Commodity-importing, energy-dependent frontier markets faced the opposite: weaker external positions, higher import costs, and limited access to international capital markets at affordable spreads.
Credit rating trends reinforced this picture. The IMF documented that across the 2022 to 2025 period, EM credit quality improved materially, with rating upgrades significantly outnumbering downgrades. In 2025, Azerbaijan and Oman regained investment-grade status. Paraguay, Serbia, and Morocco were tracking toward investment-grade classification for the first time. Further upgrades were expected in 2026 among higher-yield and frontier issuers that had implemented IMF-supported fiscal adjustment and reform programmes. This is not a uniform credit story. It is a dispersed one, in which sovereign trajectory is driven by institutional credibility, external balance position, and policy quality rather than regional or asset class membership.
For portfolio exposures, this dispersion creates concentration risk if portfolios are assembled on the basis of label or region rather than fundamental analysis. The IMF's research on geopolitical fragmentation is relevant here: a one standard deviation increase in geopolitical tensions between an investing country and a recipient country reduces bilateral cross-border portfolio investment and bank lending by approximately 15%. For European institutional portfolios, geopolitical alignment between investor domicile and issuer country is no longer a background consideration. It is a measurable factor affecting expected capital flow stability at the exposure level.
USD and Global Liquidity: A Changed Environment
One of the structural supports for EM hard currency debt through 2025 was US dollar depreciation. BIS global liquidity data confirmed that dollar credit to non-bank borrowers outside the United States grew 8.5% year-on-year by end-2025, the fastest annual rate since Q3 2014, partly reflecting the dollar's steady decline through the first three quarters of that year. A weaker dollar reduces the real debt servicing burden for issuers whose revenues are in local currency while their obligations are in US dollars. It also supports capital inflows to EM by improving the relative attractiveness of non-dollar assets.
Into Q1 2026, this dynamic became less clear. Safe-haven flows associated with Middle East conflict produced episodes of dollar strengthening, which offset the depreciation trend of 2025. The result was a dollar that was rangebound rather than clearly weakening, creating a less supportive external environment for EM hard currency issuers with limited reserve buffers and constrained fiscal space.
The BIS data also documented a structural shift in cross-border credit: the share of EM credit denominated in non-major currencies (that is, currencies other than the US dollar, euro, or yen) increased from 21% at end-2019 to 29% at end-2025. This reflects incremental de-dollarisation at the margins of the credit system. However, the dollar retained approximately 60% of global foreign exchange reserves and dominated FX transactions. For hard currency sovereign exposures, the US dollar remains the primary risk transmission channel, and portfolio-level duration management relative to US Treasury benchmarks remains a first-order consideration.
DFIs as Structural Anchors
Against a backdrop of heightened sensitivity to external shocks, the role of DFI (development finance institution) exposures within EM sustainable debt portfolios deserves specific attention. Issuers such as the World Bank (IBRD), IFC, ADB, AfDB, and EBRD occupy a distinct position in the credit spectrum: AAA-rated, supported by preferred creditor status, and increasingly active in the sustainable bond market at scale.
In fiscal year 2025, IBRD raised approximately $64 billion through Sustainable Development Bonds, maintaining its position as the largest supranational sustainable bond issuer globally. IDA (the World Bank's concessional lending arm) issued approximately $19 billion. The World Bank's inaugural fiscal 2026 US dollar benchmark bond (a five-billion-dollar 10-year transaction) attracted an order book exceeding $13 billion, with participation from central banks, bank treasuries, and asset managers globally. IFC's 2025 social bond (a $2 billion transaction with an $11 billion order book, the largest social bond order book in IFC history) confirmed that investor demand for DFI-issued, use-of-proceeds-verified sustainable paper remained structurally robust even as broader market sentiment became more volatile.
These instruments serve a specific function within SFDR-compliant portfolios. Their frameworks are aligned with the ICMA Green Bond Principles and Social Bond Principles, and their use-of-proceeds structures are verified at the project level, providing the documentation required for sustainable investment classification under current SFDR requirements. In a portfolio context, they also provide liquidity and duration optionality that is not always available in sovereign GSS bonds or EM corporate sustainable instruments.
This distinction matters structurally. DFI bonds do not carry the same refinancing risk, bilateral creditor complexity, or geopolitical alignment sensitivity that applies to EM sovereign exposures. Their inclusion in a sustainable EM fixed income portfolio functions as a quality and liquidity anchor.
Sources: IMF World Economic Outlook (April 2026); IMF Global Financial Stability Report (April 2026); IMF Policy Paper on EMDE Debt Vulnerabilities (February 2025); IMF Working Paper on Geopolitics and Financial Fragmentation (2024); BIS International Banking Statistics and Global Liquidity Indicators (end-December 2025 and end-September 2025); World Bank FY2025 Annual Report and Treasury bond issuance data; ICMA Commentary on the SFDR 2.0 Proposal (February 2026); European Commission SFDR 2.0 Proposal (November 2025).