Generated September 26, 2026.
Overview
SPMO and SPYG are both large-cap equity ETFs tracking S&P 500 subsets, but they use different selection criteria. The key distinction is narrowness: SPMO applies a momentum overlay to a subset of S&P 500 stocks; SPYG captures the full growth segment of the index.
How they differ
SPMO's momentum strategy makes it meaningfully more concentrated. The fund targets only the highest-momentum names, which drives its beta of 1.35—higher volatility than SPYG's 1.22 beta.
The expense ratio difference is stark: SPYG charges 0.04%, while SPMO charges 0.13%. Over 20 years, that 0.09 percentage-point gap compounds significantly. Dividend yield differs as well: SPMO's 0.64% distribution rate reflects the lower payout profile of high-momentum stocks (which tend to reinvest earnings), while SPYG's 0.48% yield is slightly higher. This gap may reflect different sector and company-stage compositions between the two indexes, though the underlying drivers would merit investigation.
Who each is best for
- SPMO: Fits investors seeking concentrated factor exposure who are comfortable with higher volatility and who have a longer time horizon.
- SPYG: Fits investors who want broad S&P 500 growth exposure with minimal fees, lower volatility than momentum-focused alternatives, and a simpler, more diversified holding.
Key risks to know
- Momentum mean reversion. Momentum factors can reverse sharply when market conditions shift. Stocks at the top of the momentum ranking today may face headwinds as their valuations compress or sentiment turns, creating potential drawdown periods where SPMO significantly underperforms the broader market.
- Concentration and style concentration risk. SPMO's focus on the highest-momentum S&P 500 names creates a narrower portfolio than SPYG. If momentum stocks fall out of favor relative to value or lower-volatility equities, SPMO's performance could lag for extended periods.
- Higher beta volatility. SPMO's beta of 1.35 versus SPYG's 1.22 means SPMO typically amplifies market downturns more sharply. In a 20% market correction, SPMO would historically decline more than SPYG in percentage terms.
- Lower yield and price-appreciation dependence. SPMO's 0.64% yield is modest, meaning most returns depend on price appreciation rather than income, leaving investors more exposed to timing risk in a sideways or declining market.
Bottom line
If you want broad growth exposure with minimal cost and lower volatility, SPYG's larger asset base, lower expense ratio, and slightly higher yield offer a straightforward, more stable holding. If you're comfortable with concentrated factor risk and higher volatility in pursuit of momentum-driven returns, SPMO fits a more tactical allocation. Past performance of either factor strategy does not predict future results.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.