Generated September 26, 2026.
Overview
SPMO and SPYM both track S&P 500–derived indexes, but they pursue different strategies. SPMO isolates the highest-momentum names within the S&P 500 via the S&P 500 Momentum Index, tilting toward outperformers. SPYM holds the full S&P 500 in market-weight order, offering vanilla large-cap blend exposure. The key distinction is factor tilt versus broad index replication.
How they differ
SPMO applies a momentum screen to the S&P 500, concentrating holdings in stocks with the strongest recent price and earnings momentum, while SPYM holds all 500 constituents at index weight. That structural difference drives their risk profiles: SPMO carries a 1.35 beta versus SPYM's 1.0, meaning it amplifies market swings. SPYM is also far larger ($176B in assets versus $23.2B), and its expense ratio is 0.02%, nearly 6.5 times cheaper than SPMO's 0.13%.
Who each is best for
SPMO: Fits investors who want exposure to market outperformers and are comfortable with higher volatility and lower near-term income in exchange for potential momentum-driven price appreciation.
SPYM: Fits investors seeking core U.S. equity exposure with minimal cost drag, stable dividend income, and the full S&P 500 portfolio without factor tilts or sector concentration bets.
Key risks to know
- Momentum reversal risk: Momentum factors historically experience drawdowns when market sentiment shifts. SPMO's concentration in recent outperformers may underperform when leadership rotates away from momentum stocks toward value or defensive sectors.
- Beta amplification: SPMO's 1.35 beta means it will decline faster than the broad index in downturns and rally more aggressively in rallies. Investors with lower risk tolerance or shorter time horizons face magnified drawdown exposure compared to SPYM's market-tracking 1.0 beta.
- Concentration within the index: SPMO's momentum screen likely reduces diversification by overweighting a subset of the 500 constituents. Overlapping holdings within that subset introduce sector concentration risk not present in SPYM's market-weight approach.
- Dividend yield gap: SPMO's 0.64% yield is substantially lower than SPYM's 1.07%, reflecting momentum's tilt toward growth. Investors targeting steady income flow will receive less from SPMO, all else equal.
Bottom line
If you value pure market exposure and minimal cost, SPYM's 0.02% expense ratio and $176B asset base make it a straightforward choice. If you're willing to accept higher volatility and lower current yield for a tilt toward recent market winners, SPMO's momentum screen may fit a satellite allocation. The tradeoff is simplicity and income stability against a concentrated factor bet. Past performance does not guarantee future results.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.