BlackRock | Rethink the rules: how TAA and ETFs are reshaping portfolio construction

September 18 2026

As global markets fragment into distinct regional poles, tactical asset allocation – powered by precise index data and ETF implementation – has become essential for navigating regime shifts and enhancing portfolio resilience.

  • Daniel Caderas, Portfolio Manager, Global Tactical Asset Allocation APAC Lead, BlackRock
  • Raman Aylur Subramanian, Managing Director, Index Research & Development, MSCI

Part 1: Introducing TAA

Q: Why is TAA important?

Daniel: For many years, investors could rely on structural market tailwinds and static strategic allocations to deliver attractive outcomes. Today, the investment landscape is fundamentally different. Growth and inflation regimes have become less stable, monetary and fiscal policy cycles have diverged across regions, and traditional diversification relationships, such as the negative correlation between equities and bonds, can no longer be taken for granted. As recent years have demonstrated, even a classic 60/40 equity/bond portfolio can experience significant drawdowns when both asset classes reprice simultaneously.

Today’s investment environment also demands a more active approach. Markets evolve faster, asset class relationships have become increasingly regime dependent, and the volume of available data has expanded dramatically. The challenge is no longer obtaining information, but distinguishing meaningful signals from noise and understanding what is already reflected in prices. Converting macro, market, positioning, valuation and alternative datasets into actionable investment insights has become an increasingly important source of investment edge.

Against this backdrop, tactical asset allocation (TAA) has become an increasingly important complement to strategic asset allocation. Rather than replacing long-term portfolio construction, TAA dynamically adjusts exposures as macroeconomic conditions, market expectations and pricing evolve. A disciplined, data-driven process helps identify pricing dislocations, adapts portfolios as conditions change, and improves portfolio resilience.

Q: What does MSCI data tell us about how market dynamics have shifted in recent years, and what does this mean for how investors think about portfolio construction?

Raman: For much of the post-financial-crisis era, global allocation could be reduced to a deceptively simple instruction: stay long America. Between 2009 and 2024, US equities outperformed the rest of the developed world by roughly seven percentage points a year, while developed-market currencies outside the US declined by about 15% cumulatively against the US dollar.1

But regimes rarely end with formal announcements. In the first half of 2025, the pattern reversed sharply. Fiscal expansion in Europe, rising long-term yields across Germany, the UK and Japan, and a weaker US dollar helped redirect capital toward markets outside the US.

Our correlation analysis suggests this may be more than a temporary rotation. Global markets increasingly appear to be organising around three distinct poles — the US, Europe and emerging markets — rather than moving together as a single globalised bloc. The implication is important: cross-regional diversification may now offer greater value than it did in the years immediately following the financial crisis.

Institutional investors seem to recognise the change. When we asked how they planned to respond, broader geographic diversification was the clear priority — and that intention is already becoming visible in capital flows.

For insurers in Asia, the question is therefore not simply where to invest, but whether the old allocation architecture still fits the new regime. Do static regional weights adequately reflect the world as it now stands? Or should strategic allocations be complemented by a more dynamic, tactical layer — one capable of responding as the balance among the world’s three market poles continues to shift?

Part 2: How do we approach TAA

Q: What does TAA mean to BlackRock?

Daniel: At BlackRock, tactical asset allocation is rooted in the belief that markets continuously evolve and investment opportunities emerge as macroeconomic regimes, policy dynamics and investor expectations change. Our process combines top-down macro analysis with systematic and discretionary research to identify where market pricing has diverged from our assessment of fundamentals. We continuously incorporate a broad and evolving set of macro, market, positioning and alternative datasets, allowing our process to remain data-driven and flexible as new information becomes available.

While broad macro views remain important, much of the value generated through TAA comes from identifying temporary pricing anomalies across granular investment opportunities rather than relying on a small number of binary market calls. As dispersion increases across regions, sectors and asset classes, we seek to capture multiple independent sources of alpha through a disciplined framework integrating investment insight with rigorous risk management.

Equally important is how individual ideas interact within the overall portfolio. Rather than evaluating opportunities in isolation, we apply a portfolio engineering approach that combines complementary building blocks with differentiated return drivers. By constructing portfolios from alpha streams that are both additive and as uncorrelated as possible – to traditional market beta and to each other – we seek to build greater robustness and resilience across market environments. TAA is therefore not simply an exercise in forecasting, but in designing portfolios that deliver diversified outcomes across changing regimes.

Q: How does MSCI index data help investors move from identifying a market opportunity to understanding which index exposure best captures it?

Raman: A market view is not yet an investment strategy. An institution may conclude, for example, that European cyclicals or selected emerging-market currencies offer better risk-adjusted opportunities than US mega-cap technology. But the more difficult task is identifying the building block that expresses that conviction cleanly, without smuggling in risks the investor never intended to own.

This is where granularity becomes essential. Frameworks, such as MSCI IndexMetrics, allow investors to look beneath the index label and decompose active exposures — by country, sector, factor or theme — relative to a parent index. The objective is straightforward but important: to establish whether an index’s excess return and risk are genuinely driven by the intended thesis, rather than by an incidental concentration in a particular sector, market or handful of securities.

Combined with factor and thematic index suites designed to isolate specific structural trends, that transparency can enable institutional investors to turn a broad directional judgment into a more precise and investable exposure. For insurers operating a formal tactical asset-allocation process, it serves a second purpose as well. Clear attribution strengthens governance, supports the audit trail and helps explain tactical positions not as merely intuitive bets, but deliberate exposures with an identifiable rationale.

The distinction matters. In tactical allocation, being right about the regime is only half the task; the other half is ensuring the instrument expresses the view — and little else.

Part 3: ETFs as an efficient implementation tool for TAA

Q: In a TAA context where speed and precision matter, why does the choice of the underlying index become particularly important?

Raman: In tactical asset allocation, speed without precision is merely a faster route to the wrong exposure. An index that rebalances too slowly, defines its universe too loosely or proves costly to replicate can surrender precisely the advantage that a tactical tilt was intended to capture.

An ETF, after all, is only as reliable as the index architecture beneath it. The construction methodology — how clearly and consistently the index defines its investable universe, rebalances its constituents and treats corporate actions — contributes to whether the vehicle can deliver the intended exposure when the opportunity arises, rather than after it has begun to fade.

For insurers, this discipline has additional importance. Transparent, rules-based and replicable index construction allows positions to be independently verified and more readily reconciled with internal risk, capital and governance frameworks — all areas likely to attract scrutiny in a regulatory review.

The quality of the underlying index is what allows a tactical judgment to travel cleanly from investment thesis to portfolio position: swiftly enough to matter, precisely enough to express the view and transparently enough to withstand audit.

Q: What role can ETFs play within an insurer’s broader TAA implementation toolkit?

Daniel: Successful TAA to us is a three-step process: transforming data into investment insights, translating those insights into the right market expression, and implementing them efficiently. Identifying a pricing dislocation is only the beginning. Capturing alpha requires selecting the right exposure and implementing it before markets adjust. In a zero-sum game where alpha is competed away, both investment insight and implementation efficiency drive returns.

ETFs have become an important implementation tool because they combine liquidity, transparency and precision within a single instrument. They enable investors to gain or adjust exposures rapidly, replicate benchmark allocations, and implement tactical tilts without the operational complexity of trading large baskets of securities or derivatives. Their breadth across asset classes, regions and investment styles enables precise market expression.

Today’s ETF ecosystem also enables highly targeted implementation. Rather than expressing broad global equity views, investors can allocate across countries, sectors and styles where relative opportunities are most compelling. For example, when return dispersion between equity markets widens, country ETFs covering the MSCI ACWI universe allow investors to capture country rotation opportunities by increasing exposure to expected outperformers while reducing allocations elsewhere. ETFs help translate investment insights into portfolio returns.

1Source: MSCI Research, “Investment Trends in Focus: Keeping Pace with the First-Half Market Reshuffle”, data as of 7 July 2025.

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