For decades, portfolio construction rested on a relatively simple premise: combining stocks and bonds could balance risk and return. However, events in recent years have put that logic to the test.
Persistent inflation, geopolitical tensions, shifts in monetary policy, and growing market concentration have led many managers to reconsider a fundamental question: what does it really mean to be diversified in 2026?
This was precisely one of the main conclusions recently addressed by Morningstar in its research on diversification. The firm maintains that diversification remains one of the most effective tools for managing risk, but warns that relationships between different asset classes have evolved, forcing managers to revisit some of the traditional premises of portfolio construction.
The challenge of correlations
One of the most relevant aspects highlighted by recent Morningstar studies is that true diversification does not depend solely on the number of assets in a portfolio, but on how they behave in relation to each other.
In other words, holding more assets does not necessarily result in a more resilient portfolio if they all react in a similar way to the same macroeconomic factors.
The evolution of the correlation between stocks and bonds provides a particularly relevant insight for managers. While many market participants consider a negative correlation between these two asset classes to be the norm, the data reveals a more complex reality. Over the last 51 years, stocks and bonds recorded positive correlation in 67% of calendar years.
Annual correlation between stocks and bonds (1975-2025)
Source: Bloomberg. Equities represented by the S&P 500 and bonds by the Bloomberg US Treasury Total Return Index. Chart presented by Maricarmen de Mateo, Head of Alternatives Distribution at Vinci Compass, during the webinar “Tendencias, desafíos y herramientas que están redefiniendo la gestión de activos en 2026”, organized by FlexFunds and Funds Society.
The prolonged period of negative correlation observed from the early 2000s through 2021 coincided with an environment characterized by moderate inflation, globalization, and declining interest rates. However, the return of inflationary pressures, combined with a more complex geopolitical landscape and rates that could remain higher for longer, has once again driven positive correlations between both asset classes.
For managers, the message is clear: asset relationships are not permanent. The effectiveness of a diversification strategy depends, to a large extent, on the prevailing economic regime and the ability to identify risk and return sources that respond to different dynamics.
This reality has led many managers to reassess the composition of their portfolios and seek new exposure sources to complement traditional equity and fixed income strategies.
From asset diversification to risk-source diversification
Historically, diversification was understood as an allocation across different traditional asset classes: equities, fixed income, cash, and even international exposure.
Today, an increasing number of professionals are adopting a different approach: diversifying by risk sources.
Under this approach, the goal is no longer simply to add more positions, but to incorporate exposures that respond to different economic dynamics, whether through specialized fixed income strategies, private credit, infrastructure, trade finance, real estate assets, commodities, or certain alternative strategies.
The Nuveen EQuilibrium Global Institutional Investor Survey 2026, based on responses from 800 institutional investors managing USD 16.6 trillion in assets, shows that private markets continue to gain prominence within global portfolios.
One of the most revealing data points is that the percentage of institutions with more than 20% allocation to private markets is projected to rise from 29% currently to 51% over the next five years.
Expected evolution of allocations to private markets
Source: Nuveen EQuilibrium Global Institutional Investor Survey 2026.
While the search for returns remains a relevant factor, this evolution also reflects institutional investors’ interest in incorporating assets with differentiated behavior relative to traditional public markets.
Securitization as a bridge to new exposures
As managers expand the universe of exposures used to diversify their portfolios, the need for efficient structures to access, package, and distribute those strategies also grows. In this context, securitization is taking on renewed relevance.
Beyond its traditional role as a financing tool, securitization makes it possible to transform different strategies and assets into structured, distributable investment vehicles within the international financial infrastructure.
Its value lies in expanding the universe of exposures that managers, advisors, and institutions can efficiently incorporate into their portfolios.
This encompasses both liquid and illiquid assets: from global equity, fixed income, active management, thematic, or multi-asset strategies, to exposures tied to infrastructure, real estate projects, or specialized financing.
The ability to structure these strategies under investment vehicles with institutional operational and distribution standards facilitates access to return sources that, in many cases, would be more complex to implement through traditional structures.
In an environment where managers seek to combine operational efficiency, global access, and greater risk diversification, securitization is establishing itself as a tool capable of connecting an increasingly broad range of assets and strategies with institutional investors and international distribution platforms.
Diversify better, not necessarily more
The current evolution of markets seems to be driving a transition from quantitative diversification toward qualitative diversification.
The goal is not to add more assets to a portfolio, but to identify those that genuinely contribute differentiated behavior across different economic cycles.
The diversification discussion no longer revolves exclusively around how many assets to include, but around understanding which risks are present in a portfolio and which remain uncovered.
In that context, securitization should not be understood solely as a financial structuring tool, but as a mechanism that enables access to new exposure sources, expanding the available set of opportunities and building portfolios that are potentially more robust in an increasingly complex environment.
Because if anything seems to have changed in recent years, it is not the importance of diversification. What is changing is the environment in which it must be built.
In a world where correlations among traditional assets can vary significantly depending on the economic regime, the ability to access a broader range of exposures, liquid and illiquid, public and private, is becoming an increasingly relevant element for building resilient portfolios.
The question for managers is no longer whether to diversify, but how to build portfolios capable of adapting to an environment where asset relationships are constantly evolving. In that challenge, expanding the available universe of exposures can be just as important as asset selection itself.
At FlexFunds we help managers, advisors, and institutions transform a wide variety of strategies and assets into internationally distributable investment vehicles. To explore how securitization can contribute to your diversification objectives, contact our specialists at info@flexfunds.com
