Generated September 19, 2026.
Overview
FXAIX is a mutual fund tracking the S&P 500, giving you exposure to 500 large-cap U.S. companies across all sectors. QQQ is an ETF tracking the Nasdaq-100, concentrating on 100 of the largest non-financial stocks, heavily weighted toward technology and growth. The core distinction: FXAIX offers broad large-cap exposure; QQQ tilts sharply toward tech and growth stocks with meaningfully higher volatility.
How they differ
FXAIX holds the entire S&P 500, while QQQ holds only the 100 largest Nasdaq stocks, excluding financials—a much narrower universe skewed toward technology, consumer discretionary, and communication services. This shows up in their betas: FXAIX runs at 1.0 (meaning it moves with the broad market), while QQQ's 1.26 indicates it amplifies market moves by 26%. On yield, FXAIX distributes 1.03%, compared to QQQ's 0.45%, reflecting the growth focus of tech stocks. FXAIX's expense ratio is 0.015%—among the cheapest in the industry—versus 0.18% for QQQ.
Who each is best for
FXAIX: Fits investors seeking core large-cap U.S. equity exposure with minimal cost, broad sector diversification, and a stable income stream from lower-volatility, mature companies.
QQQ: Fits investors comfortable with growth-stock concentration and willing to accept higher volatility in exchange for upside participation in technology and innovation-driven sectors.
Key risks to know
- Sector concentration in QQQ. The Nasdaq-100's heavy technology weighting means performance diverges sharply from the broad market when tech underperforms. FXAIX's diversification across all 11 sectors provides more stable returns during sector rotations.
- QQQ's higher beta amplifies drawdowns. With a beta of 1.26, QQQ can decline 25%+ more sharply than the S&P 500 in downturns, making recovery time longer for buy-and-hold investors.
- Growth-stock valuation sensitivity. QQQ's holdings are more sensitive to interest-rate changes and earnings expectations than the S&P 500. Rising rates or slowing growth can trigger sharper repricing.
- Lower yield on QQQ reflects growth orientation. QQQ's 0.45% yield versus FXAIX's 1.03% signals QQQ's holdings reinvest more earnings into growth rather than dividends, increasing tax drag and reinvestment risk in taxable accounts.
Bottom line
If you want broad U.S. large-cap equity exposure with the lowest possible fees and diversification across all sectors, FXAIX's 0.015% expense ratio and 1.0 beta make it a core-holding choice. If you have higher risk tolerance and believe in concentrated growth exposure to technology leaders, QQQ's higher beta and growth tilt offer that, though at higher volatility and slightly higher cost. Past performance doesn't predict future results, and your time horizon should guide how much volatility you can tolerate.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.