Generated April 2026 from current fund data.
Overview
SPMO and VOO are both S&P 500–focused equity ETFs, but they take different approaches to the index. VOO holds all 500 companies in the S&P 500, tracking the broad market. SPMO holds a subset—those 500 names ranked highest by momentum, a factor that favors stocks with the strongest recent price trends. This single strategic difference drives everything else: return potential, volatility, yield, and fee structure.
How they differ
The biggest difference is strategy. SPMO concentrates on momentum leaders within the S&P 500, meaning it overweights stocks rallying fastest and underweights laggards. VOO holds every stock in equal weight relative to market cap, making it a pure market-cap tracker. This shows in beta: SPMO's 1.16 beta means it's 16% more volatile than the broader market, while VOO's 1.0 beta moves in lockstep with the S&P 500.
Yield is the second key divergence. VOO distributes 1.09% annually; SPMO yields just 0.79%. This gap reflects momentum stocks' tendency to be growth-oriented and lighter on dividends than the S&P 500 as a whole. Finally, fees tell a story about scale. VOO charges 0.03% annually with $1.42 trillion in AUM—Vanguard's largest ETF. SPMO costs 0.13% and holds $12.3 billion, a hundred times smaller.
Who each is best for
VOO: Buy-and-hold investors seeking full S&P 500 exposure with minimal fees and predictable tax-efficient dividends. Ideal for long-term retirement accounts and core portfolio holdings where broad market diversification matters more than outperformance.
SPMO: Investors comfortable with higher volatility who want tilted exposure to faster-growing, trending stocks within large caps. Better suited for those who can tolerate larger drawdowns and have conviction that momentum-driven selection will outpace the broad market over their holding period.
Key risks to know
- Momentum reversal. Momentum factors have extended periods of underperformance when the market style rotates away from growth to value. SPMO's overweight to the highest-flying stocks can amplify losses in those regimes.
- Concentration drag. By design, SPMO omits the slowest-momentum names, which sometimes lead recoveries. This exclusion can cost performance if the market rebounds through laggards rather than leaders.
- Volatility and drawdown. SPMO's 1.16 beta means a 20% market decline becomes roughly 23% for the fund. Investors impatient during downturns may exit at losses.
- Scale disadvantage. SPMO's smaller AUM ($12.3B vs. $1.4T for VOO) may face tighter spreads and liquidity constraints in heavy trading, though this is not a major concern for most retail investors.
Bottom line
VOO works for investors who want the full market with institutional-grade efficiency. SPMO suits those willing to chase momentum and accept higher volatility in exchange for potential outperformance and a tighter factor bet. The fee difference is negligible; the strategic choice is what matters. Past performance doesn't predict future returns—momentum can persist or evaporate depending on market regime.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.