Generated August 8, 2026.
Overview
SPYG and SPYM are both State Street ETFs tracking S&P 500 variants, but they split the market into fundamentally different slices. SPYG targets S&P 500 Growth companies—those with higher price-to-earnings and price-to-book ratios—while SPYM holds the entire S&P 500 Index in a market-cap-weighted blend. The key distinction is style exposure: growth versus broad-market.
How they differ
SPYG isolates fast-growing companies by design, while SPYM delivers the full 500 in one basket. That style split shows up immediately in their market sensitivity: SPYG carries a beta of 1.2, meaning it swings 20% more than the market, whereas SPYM's beta of 1.0 tracks the broad index precisely. SPYG yields 0.48% to SPYM's 1.05%—the lower yield reflects growth stocks' tendency to reinvest profits rather than pay dividends. SPYG costs 0.04% annually versus SPYM's 0.02%, a negligible difference, but SPYM's $157B in AUM dwarfs SPYG's $54.7B, giving SPYM deeper trading liquidity and tighter bid-ask spreads in practice.
Who each is best for
SPYG: Fits investors who want concentrated upside to faster-growing companies and can tolerate above-market volatility; works for growth-focused portfolios or those overweighting equities in longer time horizons.
SPYM: Designed for investors seeking core U.S. large-cap exposure with minimal style tilt; suits broad-market allocations and serves as a portfolio foundation where style-specific bets belong elsewhere.
Key risks to know
- Style concentration in SPYG. Growth stocks as a group can underperform value and dividends for extended periods; a market rotation away from growth would magnify SPYG's losses relative to the full market. SPYM avoids this by holding both styles.
- Higher beta amplifies SPYG volatility. At a beta of 1.2, SPYG's drawdowns will exceed the market's—a 20% market decline means roughly 24% for SPYG. This magnification works both ways but raises sequence-of-returns risk for investors near or in drawdown periods.
- Dividend yield gap signals different return composition. SPYG's lower 0.48% yield suggests future returns depend more on price appreciation; SPYM's 1.05% yield means dividends cushion volatility. Growth stocks historically trade higher valuations, which can compress future returns if multiples compress.
- AUM disparity creates practical liquidity differences. SPYM's $157B versus SPYG's $54.7B means SPYM will have tighter spreads and faster execution on large orders; SPYG's smaller fund is still liquid but less ideal for very large positions.
Bottom line
If your investment thesis centers on long-term U.S. growth and you can stomach equity-market volatility amplified by 20%, SPYG offers concentrated access to the S&P 500's fastest-growing names; if you want a core U.S. equity holding that balances growth and value without active style decisions, SPYM delivers the full market at a fractionally lower cost and higher income. Your choice depends on whether you're building a satellite growth bet or a foundational broad-market position. Past performance in either style does not predict which will lead going forward.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.