Dual momentum is a systematic ETF strategy that combines relative momentum (comparing assets to pick the strongest) with absolute momentum (checking whether the winner is worth owning at all). Created by Gary Antonacci and formalized in his 2015 book, it uses a simple monthly decision rule across just two or three ETFs. The strategy delivered ~17% annualized returns in its 40-year backtest with roughly one-fifth the drawdown of the S&P 500 — though real-world results since publication have been more mixed, which matters for setting expectations.
The short version
- Dual momentum = relative momentum (which asset is strongest?) + absolute momentum (is it worth owning?)
- The classic implementation is Global Equity Momentum (GEM): compare SPY vs EFA, buy the 12-month winner if it beats T-bills, otherwise buy AGG bonds
- Rebalanced monthly — about 5 minutes of work per month
- Backtest (1974–2013): ~17% annual return, ~10% max drawdown vs S&P 500’s 10% return and 51% drawdown
- Post-publication (2014–2022): underperformed buy-and-hold during the long US bull market — this is expected behavior, not a flaw
- Minimum account size: ~$5,000
- Tax efficiency: moderate — monthly rebalancing can trigger short-term capital gains
What exactly is dual momentum?
Dual momentum is a rules-based tactical asset allocation strategy. It applies two distinct momentum filters before deciding what to buy:
Relative momentum (cross-sectional): Among a defined set of assets, which one has performed best over the lookback period (typically 12 months)? The winner gets the allocation. This is the “which one?” question.
Absolute momentum (time-series): Is the winning asset actually in an uptrend? The strategy compares the winner’s return against a risk-free benchmark (T-bills). If the winner can’t beat T-bills, the strategy moves to defensive bonds. This is the “should I own it at all?” question.
By combining both filters, dual momentum avoids two common pitfalls: buying a weak asset just because it’s the “best of a bad bunch” (relative momentum alone), and buying a strong rising asset without checking whether the broad trend supports it (absolute momentum alone).
Who created dual momentum?
Gary Antonacci, an independent researcher, published the framework in his 2012 SSRN paper “Risk Premia Harvesting Through Dual Momentum” and expanded it into the 2015 book Dual Momentum Investing: An Innovative Strategy for Higher Returns with Lower Risk. Antonacci didn’t discover momentum as a market anomaly — that credit belongs to academics Jegadeesh and Titman (1993) — but he was the first to package relative and absolute momentum into a single executable system for retail investors.
The academic foundation runs deep. Jegadeesh and Titman (1993, confirmed 2001) showed stocks with strong 3–12 month returns continued to outperform. Asness, Moskowitz, and Pedersen (2013) at AQR Capital extended this across global stocks, bonds, commodities, and currencies. Momentum is widely considered the most persistent market anomaly. Antonacci’s contribution was making it practical: two ETFs, one comparison, one decision per month.
How does the Global Equity Momentum (GEM) strategy work?
GEM is the most popular implementation of dual momentum. Here is the exact decision rule:
- Compare the 12-month total return of SPY (US equities) vs EFA (developed international equities).
- If the winner’s 12-month return is higher than the 1-month T-bill rate, buy that winner.
- If both SPY and EFA have negative absolute momentum (below T-bills), buy AGG (US aggregate bonds).
- Rebalance once per month. No adjustments between monthly signals.
That’s the entire strategy. Twelve decisions per year, most taking under a minute. The bond position is the “risk-off” parking spot — it preserves capital until one of the equity ETFs re-establishes positive absolute momentum.
What ETFs do you need for dual momentum?
| ETF | Ticker | Role | Expense Ratio |
|---|---|---|---|
| SPDR S&P 500 Trust | SPY | US large-cap equities | 0.09% |
| iShares MSCI EAFE ETF | EFA | Developed international equities | 0.33% |
| iShares Core US Aggregate Bond ETF | AGG | Defensive bond position | 0.03% |
These are the three ETFs used in the standard GEM model. Some practitioners substitute VTI for SPY (total US market instead of S&P 500) or BND for AGG, but the core selection logic remains identical. Antonacci’s own backtests used index data rather than specific ETFs, so these tickers are practical approximations vetted by the community.
Account minimum: because GEM holds only one ETF at a time and AGG trades at roughly $100/share, the strategy works with accounts as small as $5,000. Larger accounts benefit from lower trading costs as a percentage of position size.
How do you calculate the signals each month?
You need two pieces of data for each ETF: the current price and the price from 12 months ago. Most brokers provide 12-month return figures directly. Alternatively, you can calculate it manually:
- Get the adjusted close price of SPY and EFA from 12 months ago and today.
- Calculate 12-month return = (current price / price 12 months ago) — 1.
- Get the 1-month T-bill rate (available at Treasury.gov or via your broker).
- Apply the GEM decision rule above.
- If the signal changes, place the trade. If it stays the same, do nothing.
For retail traders who don’t want to calculate this manually each month, several services publish the GEM signal: Antonacci’s own Optimal Momentum site, and tools like Reblnc provide automated signal tracking. The Quant Investing ETF Momentum dashboard also ranks ETFs by 12-month return across global markets.
What performance did the backtest show?
Antonacci’s backtest running from 1974 through 2013 showed these results (source: Antonacci, 2012 SSRN paper):
| Metric | GEM (Dual Momentum) | S&P 500 Buy-and-Hold | 60/40 Portfolio |
|---|---|---|---|
| Annualized return | ~17% | ~10% | ~10% |
| Max drawdown | ~10% | ~51% | ~27% |
| Period | 1974–2013 | 1974–2013 | 1974–2013 |
The drawdown comparison is the standout finding. GEM’s worst peak-to-trough loss was roughly 10%, versus 51% for buy-and-hold during the 2000 dot-com crash and 2008 financial crisis. The absolute momentum filter rotated the portfolio to bonds before the worst losses materialized, then rotated back to equities once trends re-established. Independent analyses using ETF data (which are constrained by shorter ETF lifespans) broadly confirm the pattern, though the magnitude of outperformance is smaller over the ETF-only period.
How did dual momentum perform after publication?
This matters because backtests are not reality. From roughly 2014 through 2022, GEM underperformed a simple S&P 500 buy-and-hold. The reasons are straightforward and honest:
- The US bull market ran for years with shallow corrections — GEM’s defensive trigger rarely activated
- When GEM rotated to international equities (EFA), it significantly underperformed SPY due to US market dominance
- Whipsaw trades — brief signals that reversed quickly — generated transaction costs and caused the strategy to miss parts of rallies
This is not a sign the strategy is broken. Long bull markets with shallow drawdowns are the worst-case scenario for any trend-following approach. GEM is designed to protect against crashes, not to maximize returns when the market goes up almost every year. The strategy did what it was supposed to do in March 2020 — rotated to bonds ahead of the COVID crash, then back to equities in April — but the crash and recovery were so fast that some investors missed the rotation entirely.
GEM remains the benchmark that tactical ETF strategies are measured against precisely because its rules are fully transparent and independently verifiable. No black box, no proprietary indicators, no data mining.
What are the limitations of dual momentum?
Every strategy has weaknesses. Dual momentum’s are well-documented:
- Underperforms in long bull markets. As noted above, the defensive mechanism is a drag when drawdowns are shallow and brief.
- Tax inefficiency. Monthly rebalancing means holdings rarely qualify for long-term capital gains treatment. Best used in tax-advantaged accounts (IRA, 401k).
- Bond correlation risk. In a rising-rate environment, AGG can fall alongside equities, reducing the defensive benefit.
- Whipsaw in choppy markets. When the 12-month return oscillates around the T-bill threshold, the strategy can trigger multiple round-trip trades in short succession.
- US-centric. GEM only considers US and developed international equities. It misses emerging markets, sector rotation, and other diversifiers that some modified dual momentum strategies include.
These limitations have directly shaped the next generation of tactical strategies — HAA (Heritage Asset Allocation) and DAA (Defensive Asset Allocation) were designed specifically to address GEM’s weaknesses while preserving its core logic.
How is dual momentum different from simple momentum?
“Simple momentum” strategies typically use only relative momentum: rank assets by recent performance and buy the top one (or top few). The problem is that during a broad market crash, the “best” asset might still be down 20%. You’re buying the least bad option in a bad market.
Dual momentum’s second filter — absolute momentum — solves this. It checks whether the winner is in an actual uptrend. If no asset passes the absolute momentum test, the strategy exits to bonds or cash. This is what protected the 1974–2013 backtest from large drawdowns: during the 2008 financial crisis, both SPY and EFA had negative 12-month returns, so GEM sat in AGG and avoided the worst of the crash.
This makes dual momentum more conservative than pure momentum. You sacrifice some upside during strong bull markets in exchange for crash protection. Whether that trade-off suits you depends on your personal risk tolerance.
Quick self-check
Test your understanding of dual momentum with these three questions.
What are the two types of momentum in dual momentum?
Relative momentum (cross-sectional — comparing assets to find the strongest) and absolute momentum (time-series — checking if the winning asset is in an uptrend relative to T-bills). Both must be applied together; using only one misses the strategy’s core protection.
When does GEM rotate to bonds instead of holding equities?
When the winner of the SPY vs EFA comparison fails the absolute momentum test — meaning its 12-month return is lower than the 1-month T-bill rate. In that case, the strategy buys AGG (US aggregate bonds) until one of the equity ETFs re-establishes positive absolute momentum.
Why did GEM underperform buy-and-hold from 2014 to 2022?
The US bull market had very shallow drawdowns, so GEM’s defensive trigger rarely activated. When it did rotate to international equities (EFA), those significantly underperformed US stocks, and brief whipsaw signals caused the strategy to miss parts of rallies. This is expected for any crash-protection strategy during a long, low-volatility bull run.
Frequently asked questions
Can I run dual momentum in a small account?
Yes. Since GEM holds only one ETF at a time and the cheapest option (AGG) trades around $100/share, accounts of $5,000 or more can implement it efficiently. Some brokers offer fractional shares, further lowering the barrier.
What lookback period does dual momentum use?
The standard is 12 months, based on Jegadeesh and Titman’s academic research showing the 3–12 month window produces the strongest momentum effect. Antonacci tested various periods and settled on 12 months as the best balance of responsiveness and signal reliability for the GEM model.
Does dual momentum work in bear markets?
That’s where it performs best. During extended downturns, the absolute momentum filter rotates to bonds before the worst losses hit. In the 2008 financial crisis, GEM avoided most of the ~50% S&P 500 drawdown by holding bonds. The strategy is specifically designed for crash protection, not bull market maximization.
Can I add more ETFs to the dual momentum universe?
Yes. Many practitioners create expanded versions that include emerging markets (EEM), REITs (VNQ), gold (GLD), or sector ETFs. This is sometimes called “sector rotation dual momentum.” The trade-off is more possible signals to track and potentially more whipsaw trades. Start with the classic three-ETF GEM before experimenting.
Is dual momentum suitable for retirement accounts?
Yes — in fact, retirement accounts are the natural home for this strategy. Since monthly rebalancing triggers mostly short-term capital gains, holding GEM in a tax-advantaged account (IRA, 401k, SIPP) avoids the tax drag. The lower drawdown risk also suits investors who cannot afford a 50% portfolio loss near retirement.
Educational content only — not financial advice. Past performance does not guarantee future results. Trading involves risk of loss. Disclaimer · Affiliate disclosure
