Which Is the Better Large-Cap ETF, Vanguard's MGK or State Street's SPY?

The State Street SPDR S&P 500 ETF Trust (NYSEMKT:SPY) and Vanguard Mega Cap Growth ETF (NYSEMKT:MGK) both provide access to large-cap U.S. stocks, but MGK features a much heavier technology tilt, higher recent returns, and a notably lower yield compared to SPY.

Both SPY and MGK aim to capture the performance of leading U.S. equities, but their approaches differ. SPY tracks the broad S&P 500 Index, offering wide sector exposure, while MGK targets the largest growth-oriented names, resulting in a more concentrated and tech-heavy portfolio. This comparison highlights how those differences play out in cost, performance, risk, and portfolio makeup.

Snapshot (cost & size)

Beta measures price volatility relative to the S&P 500; beta is calculated from five-year monthly returns. The 1-yr return represents total return over the trailing 12 months.

MGK is slightly more affordable on fees, with an expense ratio of 0.05% versus SPY’s 0.09%, but investors give up a significant amount of dividend income: MGK yields just 0.4%, while SPY yields 1.1%.

Performance & risk comparison

What's inside

MGK tracks a mega-cap growth index, resulting in a concentrated portfolio of 69 stocks, with technology accounting for 54% of assets and heavy weights in communication services and consumer cyclicals. Its three largest holdings — Nvidia (NASDAQ:NVDA), Apple (NASDAQ:AAPL), and Microsoft (NASDAQ:MSFT) — make up over a third of the fund, and its 18.3-year track record underscores its staying power. Investors looking for targeted exposure to large-cap growth, especially in tech, may find MGK’s approach appealing.

SPY, by contrast, holds over 500 companies and provides broader diversification across sectors, including substantial allocations to financial services and communication services alongside technology. Its largest positions — Nvidia, Apple, and Microsoft — are similar to MGK’s, but the overall portfolio is more balanced, reducing single-sector risk compared to MGK’s tech-heavy tilt.

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What this means for investors

The State Street SPDR S&P 500 ETF Trust (SPY) and Vanguard Mega Cap Growth ETF (MGK) offer different approaches for investors seeking exposure to large-cap stocks. Choosing between this pair of funds depends on the goals and considerations that are important to you.

MGK is ideal for those who want to invest in the largest growth stocks in the U.S. market. The low expense ratio and strong one-year return provide compelling reasons to consider this ETF. However, because the fund contains only 69 stocks that are heavily weighted towards its top three holdings, your fortunes depend quite a bit on how Nvidia, Apple, and Microsoft are doing.

SPY is for investors who desire exposure to the entire S&P 500, which provides a great foundation for an investment portfolio. The ETF avoids MGK’s shortcomings by offering robust diversification across sectors thanks to the number of companies in the fund. SPY’s expense ratio is higher than MGK’s, but it delivers a far bigger dividend yield to offset this cost.

If your priority is mega-cap growth stocks and a low cost, MGK is the ETF for you. If you want a fund that provides a mix of growth and income, and is representative of the S&P 500, SPY is the clear choice.

Robert Izquierdo has positions in Apple, Microsoft, and Nvidia. The Motley Fool has positions in and recommends Apple, Microsoft, and Nvidia and is short shares of Apple. The Motley Fool has a disclosure policy.