Generated August 15, 2026.
Overview
MGK and QQQ are both large-cap growth ETFs that track different indexes of mega-cap US equities, but they differ substantially in scope and composition. MGK tracks the CRSP US Mega Cap Growth Index, focusing on the largest growth-oriented companies across all sectors. QQQ tracks the Nasdaq-100 Index, which is limited to the 100 largest non-financial stocks listed on Nasdaq, creating a technology-heavy tilt. The key distinction: QQQ's Nasdaq exclusivity makes it narrower and more concentrated in technology and internet names, while MGK offers broader diversification across mega-cap growth across the entire market.
How they differ
QQQ is substantially larger, with $479B in AUM versus MGK's $33.7B, making it far more liquid and lower in spreads for most investors. The biggest structural difference is scope: MGK draws from the entire US mega-cap growth universe, while QQQ is limited to Nasdaq's 100 largest non-financial companies. This means QQQ is inherently more concentrated in technology and internet-related businesses. Both charge minimal fees, but QQQ's expense ratio of 0.18% is 2.5 times MGK's 0.07%, though both remain cheap by industry standards. Distributions are similar in frequency (quarterly) and magnitude—QQQ yields 0.45% and MGK yields 0.37%—so income is not a differentiator; both are total-return vehicles.
Who each is best for
- MGK: Fits investors seeking broad exposure to US mega-cap growth across all sectors—technology, healthcare, industrials, and consumer—without the tech concentration built into Nasdaq-only trackers.
- QQQ: Fits investors who want concentrated exposure to the largest and most liquid Nasdaq-listed companies, particularly those with an existing conviction that technology and internet-focused mega-cap businesses will outperform.
Key risks to know
- Sector concentration in QQQ: The Nasdaq-100's inherent limitation to non-financial stocks and its technology dominance means QQQ carries meaningful concentration risk relative to the broader market. MGK's multi-sector composition reduces this single-sector exposure.
- Narrow universe in QQQ: Restricting to exactly 100 Nasdaq stocks means QQQ's index excludes large growth companies listed on other exchanges. MGK's broader CRSP universe means it can capture mega-cap growth regardless of listing venue.
- Higher beta in both: Both ETFs carry a beta of 1.26, meaning they amplify broad market moves by 26% relative to the overall market. During downturns, both will decline faster than the S&P 500.
- Overlap in holdings: The largest Nasdaq companies likely comprise a significant portion of MGK's holdings as well. Investors holding both should verify the extent of overlap to understand their actual exposure concentration.
Bottom line
If you want mega-cap growth exposure across multiple sectors without Nasdaq's technology tilt, MGK's lower expense ratio and broader index composition align with that strategy. If you're comfortable with—or actively seeking—Nasdaq's technology concentration and prefer the deepest available liquidity, QQQ's $479B in AUM and 25-year track record offer unmatched accessibility. Both charge minimal fees and carry the same amplified market volatility; the choice hinges on whether you prefer index breadth or Nasdaq focus. 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.