Have institutional portfolios become over-engineered and too complex?

Institutional investors have spent decades building increasingly sophisticated portfolios in pursuit of better outcomes. Each new asset class, strategy and manager has been added with the intention of improving returns, enhancing diversification or strengthening risk management.

However, has the pursuit of sophistication gone too far? In an era when simple public market portfolios can rival or outperform more complex structures, investors should consider whether every layer of complexity continues to earn its place and whether it remains purposeful. Investors need to strike the right balance between investment sophistication and governance efficiency and avoid the risk of building portfolios that are over-engineered and difficult to govern effectively.

The complexity arms race

Attend almost any investment conference and the spotlight is often on a large, sophisticated investor unveiling its latest portfolio innovation. Their success can make complex strategies appear both compelling and necessary. Yet what works for a sovereign wealth fund or large public pension plan may not translate seamlessly to a $1 billion pension plan with a lean investment team. The challenge is not access to sophisticated investments, but the capacity to govern them effectively.

To be clear, complexity is not inherently bad. Many of the most important innovations in institutional investing have delivered meaningful benefits. Liability-driven investing, for example, shifted the focus of pension investors beyond assets alone to the interaction between assets and liabilities. This helped sponsors better manage funded status risk and create greater stability in contribution requirements and pension expense.

Similarly, commercial real estate, infrastructure, private equity and private credit have expanded the institutional toolkit by offering attractive combinations of return potential, diversification, inflation protection and income generation. Advances in factor analysis and factor-based investing have also deepened investors’ understanding of the drivers of risk and return.

Complexity deserves a place in a portfolio when it solves a problem or creates a measurable advantage. The challenge arises when complexity becomes an objective in itself. At that point, investors must ask whether each additional layer is genuinely improving outcomes or merely adding cost, governance burden and operational demands. In other words, has sophistication enhanced the portfolio’s resilience or has the portfolio become a victim of the complexity arms race?

The law of diminishing diversification

Many large institutional portfolios now contain dozens, and for some of the largest investors, even a greater number of underlying strategies and managers. While each addition may appear justified on its own, the cumulative effect can be a portfolio that is increasingly difficult to understand, oversee, and govern. Exposures begin to overlap, risks become less transparent and decision-making becomes slower and more cumbersome. Rather than enhancing outcomes, resources are increasingly devoted to managing complexity itself.

There comes a point where each new strategy adds more complexity than meaningful diversification. What initially appears to strengthen the portfolio can instead increase governance demands, operational costs and oversight requirements. In some cases, investors may simply be layering multiple strategies that provide similar underlying exposures, creating the illusion of diversification while making the portfolio increasingly difficult to understand and manage.

Every layer of complexity carries a cost. Some costs are visible, such as management fees, operational expenses and oversight requirements. Others are less obvious but potentially more significant: slower decision-making, reduced transparency, behavioural biases and diminished accountability. While these governance costs are rarely measured, they may determine whether complexity enhances or detracts from long-term outcomes.

Portfolio construction is as much a governance exercise as it is an investment exercise. The most effective portfolios are not necessarily the most sophisticated, but those that align investment objectives with an organization’s ability to govern risk, monitor performance and make timely decisions.

Setting a governance budget

Just as investors establish risk budgets and allocate capital thoughtfully, they should also consider a governance budget. Every investment decision consumes governance time, attention and expertise. When complexity exceeds available capacity, the hidden costs can emerge in the form of delayed decisions, oversight challenges, and reduced organizational agility. As a result, the greatest cost of portfolio complexity is often the one that never appears on a fee report. It is therefore key to assess whether the governance capacity can support the portfolio strategy.

A useful exercise for committees is to assess whether their portfolio passes the following four tests:

1. Can the committee explain its sources of return and risk?
2. Can the strategy be implemented efficiently?
3. Can it be monitored and governed effectively?
4. Does each component serve a distinct purpose and role?

When the answer to any of these questions is uncertain, complexity may be adding more burden than benefit. In such cases, the goal should not be simplification for its own sake, but rather the pursuit of smart simplicity where every strategy must demonstrate a clear contribution and earn its place within the portfolio.

Smart simplicity

Smart simplicity is not a rejection of sophisticated investing. Rather, it is the recognition that complexity should be a deliberate choice, not a default outcome. Portfolios are best served where every strategy, manager and allocation can clearly demonstrate why it belongs and how it improves the portfolio as a whole. Smart simplicity is achieving desired outcomes using the fewest portfolio building blocks necessary.

Simpler portfolio structures encourage investors to focus on the decisions that matter most. Instead of spending governance time selecting between dozens of managers, committees can devote more attention to tasks such as strategic asset mix, risk budgeting and scenario analysis, which can often provide a higher return on governance effort than incremental manager selection decisions.

Every component of a portfolio should contribute meaningfully to total portfolio outcomes and justify the governance burden it creates. This principle is at the heart of the trending total portfolio approach (TPA) amongst the largest global investors, where investments are assessed according to their contribution to total portfolio objectives. While the full adoption of the TPA requires significant organizational change, its underlying discipline is universally applicable.

Investors can begin by periodically reassessing every strategy, manager and allocation with fresh eyes. If a holding would not be selected for inclusion in a newly constructed portfolio today, its continued presence deserves scrutiny. Complexity that cannot be justified through current merit may simply be a legacy of past decisions.

Considerations for smart simplicity

By reducing unnecessary complexity, rationalizing manager structures and aligning portfolio design with total fund objectives, investors can create portfolios that are easier to understand, easier to oversee and more effective.

However, embracing smart simplicity does not lessen fiduciary responsibility or diminish the importance of ongoing education. Effective oversight still requires continuous education, disciplined decision-making and a deep understanding of the risks and opportunities that shape long-term outcomes.

1. Consolidate similar exposures
   Over time, portfolios can accumulate layers of investments that appear different on the surface but rely on the same underlying economic drivers. This can occur across public and private markets, or through multiple active managers pursuing similar styles. A closer examination of the portfolio’s true sources of return may reveal that diversification is more limited than the number of mandates suggests, creating opportunities to simplify without sacrificing outcomes.

2. Reduce manager count
   More managers do not always create a better portfolio. In many cases, a streamlined roster can provide clearer insight into portfolio risks, strengthen manager accountability, simplify oversight and improve cost efficiency. Consolidating mandates can allow investors to focus on their highest-conviction relationships while maintaining broad market exposure. For example, separate US, international and emerging market mandates may be effectively managed through a smaller number of global equity mandates.

3. Focus on outcomes, not asset classes
   Institutional portfolios are often organized around asset classes. But when viewed through the lens of outcomes, such as growth, income, inflation protection and resilience, many different asset classes may be serving the same purpose. Infrastructure, real estate, inflation-linked bonds and private credit may all contribute to income generation and inflation protection.When portfolios are viewed through this outcome-oriented lens, investors often discover that multiple strategies are solving the same problem, creating opportunities to simplify without compromising results.

4. Adopt a complexity budget
   Just as investors operate within a risk budget, they should also consider establishing a complexity budget. Before introducing any new strategy, ask four critical questions:
   • What distinct value does it bring to the portfolio?
   • What existing allocation could it replace?
   • How will success be defined and measured?
   • Do we have the governance capacity to oversee it effectively?

   A complexity budget shifts the conversation from simply adding latest ideas to making deliberate, high-conviction choices, helping ensure portfolios evolve thoughtfully rather than accumulate layers of unnecessary complexity.

5. Prioritize understandability
   A useful governance rule of thumb is that committee members should be able to confidently articulate where returns are expected to come from, what risks are being taken and how the portfolio is likely to perform under different market conditions. When that becomes difficult, it may be a sign that complexity has overtaken clarity. The goal is not simplicity for its own sake, but a portfolio in which every component serves a distinct and understandable purpose. The result is often more efficient oversight, sharper conviction and a portfolio that is easier to defend when markets become challenging.

Re-engineering through smart simplicity

Governance is often the hidden determinant of investment success. While institutional investors devote significant attention to performance, risk and costs, far fewer examine whether their governance model strengthens or constrains decision-making. Portfolio design should reflect not only investment opportunity but also governance capacity. A well-engineered portfolio is one that an organization can confidently understand, oversee and sustain through changing market environments.

Smart simplicity requires evaluating portfolios through two equally important lenses: investment efficiency and governance efficiency. The goal is not to eliminate complexity, but to ensure complexity earns its place. Strategies that meaningfully enhance outcomes and can be effectively governed deserve inclusion. Those that consume disproportionate attention, resources or oversight for limited benefit should be reconsidered. An optimal portfolio is not necessarily the most sophisticated, but the one that delivers its objectives with the greatest clarity, conviction and governance effectiveness.