Gary Antonacci's Dual Momentum Strategy

Definition

The Dual Momentum strategy, developed by Gary Antonacci, is a systematic investment approach designed to enhance returns and reduce risk by dynamically allocating capital based on asset performance. It combines two distinct forms of momentum: relative momentum and absolute momentum. This strategy aims to identify assets that are outperforming their peers while simultaneously ensuring that the overall market trend is positive, thereby seeking to participate in upward trends and avoid significant downturns. It is a long-term trend-following methodology, not intended for short-term market timing or speculative trading.

The Dual Momentum strategy is an investment framework that utilizes both relative and absolute momentum signals to select assets, aiming for superior risk-adjusted returns by staying invested in strong trends and moving to safer assets during market weakness.

Key Takeaway

The core principle of Dual Momentum is to leverage the persistent tendency of assets that have performed well recently to continue performing well (relative momentum), while simultaneously employing a protective mechanism to exit the market when overall trends turn negative (absolute momentum). This dual-layered approach seeks to capture market upside efficiently and mitigate substantial drawdowns, offering a robust framework for long-term portfolio management that adapts to changing market conditions rather than predicting them.

Mechanics

The Dual Momentum strategy operates on two primary components: Relative Momentum and Absolute Momentum. These are typically assessed over a 12-month look-back period, with rebalancing often occurring monthly.

Relative Momentum involves comparing the performance of a set of candidate assets against each other. For instance, an investor might compare the 12-month total return of U.S. equities (e.g., represented by the S&P 500) against international equities (e.g., represented by the MSCI All Country World Index ex-U.S.). The strategy dictates investing in the asset that has demonstrated superior performance over the specified look-back period. This component ensures that capital is allocated to the strongest performing segment of the equity market, capitalizing on the "winner keeps winning" phenomenon. If U.S. equities have outperformed international equities over the past year, the strategy would favor U.S. equities.

Absolute Momentum, also known as trend-following or time-series momentum, acts as a crucial risk management filter. After identifying the relatively strongest asset, its performance is then compared against a risk-free benchmark, such as short-term government bonds (e.g., U.S. Treasury bills) or simply a cash equivalent. If the chosen asset's 12-month return is positive and exceeds the return of the risk-free asset, the strategy remains invested in that asset. However, if the chosen asset's return is negative or underperforms the risk-free rate, the strategy dictates moving all capital into a defensive asset, typically an aggregate bond fund (e.g., represented by the Barclays U.S. Aggregate Bond Index) or cash. This mechanism is designed to protect the portfolio from significant market downturns, preventing large losses by exiting equity exposure during bear markets.

The combination of these two momentum filters creates a dynamic allocation process. Each month, or at a predetermined rebalancing interval, the investor evaluates the relative performance of the equity universe (e.g., U.S. vs. International). The top performer is then subjected to the absolute momentum test. If it passes, the portfolio holds that equity asset. If it fails, the portfolio shifts to the defensive bond allocation. This systematic approach removes emotional decision-making and provides a clear set of rules for portfolio adjustments.

Trading Relevance

For traders and long-term investors, the Dual Momentum strategy offers a structured framework for managing portfolios with the potential for enhanced returns and reduced volatility. Its relevance lies in its ability to adapt to varying market regimes. During strong bull markets, the strategy aims to keep investors fully exposed to the leading equity segment, capturing significant gains. In contrast, during bear markets or periods of high uncertainty, the absolute momentum component triggers a shift to less volatile assets like bonds, thereby preserving capital and minimizing drawdowns. This adaptive quality makes it particularly appealing for those seeking a more robust alternative to static buy-and-hold strategies.

The strategy's reliance on a 12-month look-back period and monthly rebalancing positions it as a medium to long-term trend-following approach, rather than a high-frequency trading system. It is not designed to capture every short-term market fluctuation but rather to align with broader, more persistent trends. This makes it suitable for investors who prioritize systematic decision-making over discretionary trading and who are comfortable with periodic portfolio adjustments. Furthermore, by providing clear rules for entry and exit, Dual Momentum can help mitigate behavioral biases that often lead to suboptimal investment decisions, such as panic selling or chasing performance.

Risks

Despite its historical outperformance and risk-reduction capabilities, the Dual Momentum strategy is not without risks. One significant risk is whipsaws, where the market experiences frequent, short-lived reversals. In such scenarios, the strategy might repeatedly switch between equities and bonds, incurring transaction costs and potentially missing out on brief rallies or being caught in short-term declines before the trend re-establishes itself. While the 12-month look-back period helps to filter out some noise, it cannot eliminate all whipsaw events.

Another risk is tracking error relative to a pure equity benchmark. While the strategy aims for higher risk-adjusted returns, there may be periods where a simple buy-and-hold equity portfolio outperforms Dual Momentum, especially during strong, uninterrupted bull markets where the absolute momentum signal might trigger a premature exit from equities. Furthermore, the strategy's effectiveness is dependent on the continued validity of momentum as an investment factor, which, while historically robust, is not guaranteed to persist indefinitely. The choice of the risk-free asset and the specific bond fund for the defensive allocation can also impact performance, introducing an element of selection risk. Finally, for individual investors, implementing the strategy requires discipline and consistent rebalancing, which can be challenging without automated tools, and transaction costs, though typically low for ETFs, can accumulate over time.

History and Examples

The Dual Momentum strategy was popularized by Gary Antonacci in his influential 2015 book, "Dual Momentum Investing: An Innovative Strategy for Higher Returns with Lower Risk." Antonacci built upon decades of academic research into momentum investing, synthesizing the concepts of relative strength and trend-following into a practical, rules-based framework. His work demonstrated through extensive backtesting that this combined approach could significantly outperform traditional diversified portfolios, such as a 60/40 stock-bond allocation, with lower drawdowns over long periods.

Historically, simulations of the Dual Momentum strategy have shown compelling results. For instance, over a 39-year period, Antonacci's Global Equity Momentum (GEM) strategy, a form of Dual Momentum, reportedly generated an average annual return of 17.43%, compared to 8.85% for a global market index. This outperformance was often accompanied by reduced volatility and smaller maximum drawdowns. A practical example might involve an investor comparing the S&P 500 (U.S. equities) with the MSCI EAFE (international equities). If the S&P 500 has a 12-month return of +15% and the MSCI EAFE has +10%, the strategy would select the S&P 500. Then, if the S&P 500's +15% return is greater than the return of a 3-month U.S. Treasury bill (e.g., +1%), the investor remains invested in the S&P 500. Conversely, if the S&P 500's return was -5%, the strategy would dictate moving into an aggregate bond fund, regardless of international equity performance, until equity momentum turns positive again.

Common Misunderstandings

One common misunderstanding is that Dual Momentum is a short-term trading strategy designed for frequent, rapid profit-taking. In reality, it is a long-term, trend-following investment strategy that typically uses a 12-month look-back period and monthly rebalancing. Its objective is to capture sustained market trends and avoid major bear markets, not to capitalize on daily or weekly price fluctuations. Investors seeking quick gains from intraday or swing trading will find this strategy unsuitable for their objectives.

Another misconception is that Dual Momentum eliminates all investment risk or guarantees positive returns. While the strategy has historically demonstrated lower drawdowns and improved risk-adjusted returns compared to passive benchmarks, it is not immune to market downturns or periods of underperformance. It can still experience losses, especially during whipsaw markets where trends are unclear or rapidly reversing. Furthermore, some believe it is a predictive strategy, attempting to forecast future market movements. Instead, Dual Momentum is a reactive strategy; it responds to observed past performance and current trends, making no explicit predictions about the future. It simply follows the path of least resistance based on predefined rules.

Summary

The Dual Momentum strategy by Gary Antonacci offers a sophisticated yet accessible framework for long-term investors seeking to enhance returns while simultaneously managing risk. By systematically combining relative momentum to identify leading assets and absolute momentum to protect against market downturns, it provides a rules-based approach to portfolio allocation. This strategy, rooted in robust academic research and demonstrated through historical backtesting, aims to keep investors aligned with strong market trends and defensive during periods of weakness. While not without its own set of risks, particularly during volatile, trendless markets, Dual Momentum stands as a powerful tool for disciplined investors looking to navigate the complexities of financial markets with a clear, systematic methodology.