Finance.yahoo.com reported on July 18, 2026, that two momentum-focused exchange-traded funds from Vanguard have significantly outpaced the S&P 500 this year. The Vanguard U.S. Momentum Factor ETF (VFMO) has delivered a 34% year-to-date return through July 17. The Vanguard S&P 500 Growth ETF (VOOG) has returned 28% over the same period. These results are more than double the S&P 500's 13.8% advance.
Context — why momentum investing matters now
Momentum strategies systematically buy recent winners and sell recent losers based on price performance. The factor has a long-documented historical premium, but its performance is famously cyclical and prone to sharp reversals. The last significant momentum crash occurred in the first quarter of 2020, when the iShares Edge MSCI USA Momentum Factor ETF (MTUM) fell 32% in 23 trading days, underperforming the broader market by over 15 percentage points.
The current macro backdrop of moderating inflation and stable, though elevated, interest rates has created a favorable environment for growth-oriented momentum. The 10-year U.S. Treasury yield has traded in a 4.1% to 4.4% range for the last four months. This stability has reduced discount rate volatility for long-duration assets, a key cohort for momentum strategies.
The primary catalyst for the strategy's 2026 outperformance is the sustained, narrow leadership within the S&P 500. A handful of mega-cap technology stocks, particularly those linked to artificial intelligence infrastructure, have driven a disproportionate share of index returns. Momentum ETFs, by construction, have become increasingly concentrated in these same names, amplifying their gains relative to the cap-weighted benchmark.
Data — what the numbers show
VFMO's 34% year-to-date gain through July 17, 2026, is 20.2 percentage points higher than the S&P 500's return. VOOG's 28% gain represents a 14.2 percentage point outperformance. This outperformance has accelerated in the second quarter; VFMO returned 18.4% from April 1 to July 17, compared to the S&P 500's 7.1%.
| Metric | VFMO | VOOG | S&P 500 |
|---|
| YTD Return | +34.0% | +28.0% | +13.8% |
| 1-Year Return | +42.6% | +36.1% | +22.4% |
| Expense Ratio | 0.13% | 0.10% | N/A |
Both ETFs exhibit much higher concentration than the broad market. As of July 17, VFMO held 296 stocks, but its top 10 holdings constituted 48.3% of the portfolio. VOOG's top 10 holdings represented 61.7% of its assets. This compares to a 34.1% weighting for the top 10 stocks in the S&P 500. The performance is sector-concentrated. The information technology sector makes up 52.8% of VFMO's portfolio and 47.2% of VOOG's, versus 30.1% for the S&P 500.
Analysis — what it means for markets / sectors / tickers
The success of these ETFs directly benefits their largest holdings through forced buying pressure. As the ETFs grow and rebalance to maintain their momentum screens, they must purchase more shares of top performers like NVIDIA (NVDA), Microsoft (MSFT), and Apple (AAPL). This creates a self-reinforcing cycle that can exaggerate both uptrends and eventual reversals.
Sectors with low momentum exposure are seeing relative outflows. The utilities, consumer staples, and real estate sectors, which are largely absent from these momentum portfolios, have returned an average of just 4.2% year-to-date. Their underperformance is compounded by institutional investors rotating capital from defensive value sectors into high-momentum growth.
A key risk is the strategy's extreme concentration. The outperformance is not diversified but relies on continued leadership from a small group of technology stocks. Any fundamental disappointment or sector rotation away from AI-related names would trigger significant underperformance. Historical data shows momentum strategies are vulnerable to rapid mean reversion when market leadership changes.
Positioning data from the Commodity Futures Trading Commission shows asset managers have built record net-long positions in Nasdaq 100 futures, a proxy for the momentum trade. Flow analysis indicates weekly inflows into U.S. growth and momentum ETFs have averaged $2.1 billion over the last month, while value ETFs have seen consistent outflows.
Outlook — what to watch next
The immediate catalyst is the Q2 2026 earnings season, which begins in earnest the week of July 21. Results and guidance from the mega-cap technology leaders—particularly NVIDIA on August 21 and Microsoft on July 29—will determine if the momentum trade has fundamental support or is overheating. Any guidance cuts would likely break the trend.
Investors should monitor the relative strength of the Technology Select Sector SPDR Fund (XLK) against the S&P 500. A break below its 50-day moving average on this ratio could signal the start of a momentum unwind. The 10-year Treasury yield remaining below 4.3% is supportive for growth stocks, but a sustained break above 4.5% would pressure valuations.
The Federal Reserve's next policy meeting on September 17, 2026, will be critical. Markets currently price a 70% probability of a 25-basis-point rate cut. A Fed decision to hold rates steady, coupled with a hawkish press conference, could trigger the volatility that historically punctures extended momentum cycles.
Frequently Asked Questions
What is the difference between VFMO and VOOG?
VFMO, the Vanguard U.S. Momentum Factor ETF, uses a proprietary multi-factor model to select stocks based solely on recent price momentum. It holds 296 stocks and rebalances quarterly. VOOG, the Vanguard S&P 500 Growth ETF, tracks a traditional growth index based on sales and earnings growth, and its performance is highly correlated with momentum during strong growth rallies. VOOG holds 228 stocks from the S&P 500 and is reconstituted annually, making it less dynamic than VFMO.
Are momentum ETFs riskier than the S&P 500?
Yes, momentum ETFs carry higher specific risk due to concentration and the factor's volatility. During the 2020 Q1 crash, VFMO fell 33.5%, underperforming the S&P 500's 19.6% drop by nearly 14 percentage points. Their standard deviation, a measure of volatility, is typically 15-25% higher than the broader market. This higher risk profile justifies the potential for higher returns but requires a greater tolerance for drawdowns.
How do expense ratios impact long-term returns for these ETFs?
VFMO charges a 0.13% annual fee, and VOOG charges 0.10%. On a $10,000 investment, these cost $13 and $10 per year, respectively. While low, compounded over decades, they create a performance drag. Over 20 years, a 0.13% fee on a portfolio returning 8% annually would reduce the ending value by approximately 2.5% compared to an identical zero-fee portfolio. However, these fees are significantly lower than the 0.59% average for tactical strategy ETFs.
Bottom Line
