By Marcelo Assalin, Head of Emerging Markets Debt, William Blair Investment Management
Emerging markets debt is shedding its old reputation as a high-beta, niche corner of fixed income. With a $44 trillion market, strengthened policy frameworks, and increasingly credible institutions, the asset class has matured into a diversified, resilient and opportunity-rich component of global bond portfolios. As EM central banks ease ahead of developed markets and frontier-market reforms unlock fresh value, investors are finding compelling real yields, improving fundamentals and genuine diversification benefits, conditions that make EMD far too substantial, and far too evolved, to remain under-owned.
Assalin says: Emerging Market Debt (EMD) is often a misunderstood asset class, misclassified as too risky or a small niche segment of fixed income. But as 2025 draws to a close, that narrative is changing. The asset class has matured – not just in size and depth, but in the quality of its fundamentals. The old stereotypes of fragile finances and unreliable policymaking are giving way to a new reality: credible institutions, disciplined fiscal management, and reform-driven resilience. Despite this evolution and strong risk adjusted returns, EMD remains under-owned and under-represented in global portfolios, partly due to lingering historical stereotypes.
Sizable And Growing
The tradable debt stock in emerging markets grew at 13% per year, from $2 trillion in 2000 to about $44 trillion (EM domestic debt has grown to $39tn while external debt reached $5tn) by the end of 2024[1]. The asset class is no longer defined by a handful of distressed sovereigns but encompasses a broad spectrum of investment-grade and high-yield credits, quasi-sovereigns, and corporates across more than 900 issuers in over 80 countries.
Improving Fundamentals and EM Resilience
The transformation began with central banks. When inflation surged globally in 2021–22, many emerging economies were first to respond – and among the most effective. Policymakers from Brazil to the Czech Republic and Indonesia tightened early and aggressively, preserving currency stability and anchoring inflation expectations well before their developed-market counterparts even moved.
Now, those same economies are entering an easing cycle with headroom and credibility, offering investors both carry and capital appreciation potential. In other words, EMs are reaping the rewards of having done the hard work early. That shift marks a profound change in the risk calculus for investors who once viewed EMD as a leveraged bet on the dollar or global liquidity.
Frontier Markets Reform Unlocks Selective Opportunities
Frontier markets continue to evolve. In the past four years, harsh global macroeconomic conditions and policy measures supported by the IMF have led many countries to move away from unsustainable currency pegs and managed exchange rates. This shift has resulted in more competitively valued currencies, as seen in Nigeria and Egypt. At the same time, tighter monetary policy and sharp interest rate hikes have strengthened the investment case for frontier markets debt.
Frontier markets offer strong diversification benefits, as they are not only uncorrelated with other risk asset classes but also with each other- even within the same country, hard and local currency bonds often behave differently. Because these markets are less researched and underrepresented in global benchmarks, active managers can capitalize on inefficiencies to deliver attractive risk-adjusted returns while managing idiosyncratic risks.
Local Markets Are Driving the Story
Local currency markets are a dynamic part of the EMD universe, and investors are noticing. Falling global yields and improving current accounts have boosted returns, while active positioning in local markets and currency management have added significant alpha. Active managers who leaned into high-real-yield markets, such as Mexico and the Philippines, have benefited from appreciating local currencies and disinflation-led bond rallies.
Crucially, these gains have come not from indiscriminate risk-taking, but from granular country-level judgment. That reflects a structural evolution in EMD as a whole: the opportunity is now driven more by idiosyncratic reform and relative value than by simple exposure to risk sentiment.
The Next Phase
As the U.S. Federal Reserve edges toward rate cuts and global liquidity normalises, EMD stands to remain a core component of global fixed income portfolios with allocations rising as investors track the strong performance and pursue to diversify their allocations in FI. Real yields remain compelling, and currency valuations offer a cushion against volatility.
Importantly, this is not a beta trade. With greater differentiation across sovereigns, the outlook favours disciplined, research-led active management – investors willing to back credible policy frameworks and reform momentum, rather than chase yield alone.
Emerging markets debt has, in short, grown up. It has matured into a sizable, diversified, and resilient asset class. EMD offers constructive fundamentals, attractive yields, and strong bi- and multilateral support. No longer just an opportunistic allocation, EM debt can meaningfully enhance portfolio diversification and potentially boost overall yields without a proportional increase in risk. This advantage stems from the gap between perceived and actual risks in EMs, creating opportunities for higher returns relative to other asset classes. In essence, integrating EM debt can deliver volatility levels comparable to developed markets while providing an alternative source of income.
[1] The Emerging Markets Debt Primer, 2025 Edition (21 July, 2025)
