MGK vs SPY ETF holdings comparison
Vanguard Mega Cap Growth ETF (MGK) · SPDR S&P 500 ETF Trust (SPY)
MGK and SPY overlap by 52.6% by portfolio weight. The remaining 47.4 percentage points are not counted as shared holdings weight by this calculation. They share 54 stocks; the largest shared position is NVIDIA Corp (NVDA), contributing 8.34% to the overlap.
The holdings dates differ. This can slightly understate overlap for funds tracking similar indexes.
What this means
MGK and SPY share a material portion of their portfolio weight in the same underlying stocks. OverlapCheck labels this "moderate holdings overlap" using house ranges of 70% or more, 30% to under 70%, and under 30%. These descriptive ranges are not industry standards or investment guidance. Holdings overlap does not measure correlation, volatility, geographic or factor exposure, fees, or suitability.
Overlap by weight sums the smaller of the two funds' weights for every stock they both hold. It answers "how much of my money is in the same stocks either way?" See methodology.
This comparison covers normalized equity positions represented in the dataset. Cash, derivatives, options, structured notes, and other non-equity assets are not included, so the result is not a complete comparison of every asset or risk in either fund.
Top shared holdings
| Company | Ticker | in MGK | in SPY |
|---|---|---|---|
| NVIDIA Corp | NVDA | 13.27% | 8.34% |
| Apple Inc | AAPL | 12.17% | 7.43% |
| Microsoft Corp | MSFT | 7.50% | 5.80% |
| Amazon.com Inc | AMZN | 4.46% | 3.73% |
| Alphabet Inc | GOOGL | 5.92% | 3.05% |
| Broadcom Inc | AVGO | 4.27% | 2.56% |
| Alphabet Inc | GOOG | 4.66% | 2.45% |
| Meta Platforms Inc | META | 4.08% | 2.38% |
| Tesla Inc | TSLA | 3.93% | 1.58% |
| Advanced Micro Devices Inc | AMD | 3.19% | 1.51% |
Holdings only in MGK or SPY
MGK has 2 fund-only positions representing approximately 0.8 percentage points of reported exposure; SPY has 449 fund-only positions representing approximately 47.4 percentage points of reported exposure. These are positions whose normalized security identifiers appear in one issuer file but not the other.
Largest positions only in MGK
| Company | Ticker | Weight |
|---|---|---|
| Space Exploration Technologies Corp | SPCX | 0.48% |
| Snowflake Inc | SNOW | 0.33% |
Largest positions only in SPY
| Company | Ticker | Weight |
|---|---|---|
| Micron Technology Inc | MU | 1.75% |
| Berkshire Hathaway Inc Cl B | BRK.B | 1.42% |
| Jpmorgan Chase + Co | JPM | 1.32% |
| Exxonmobil Holdings Corp | XOM | 1.04% |
| Johnson + Johnson | JNJ | 0.92% |
| Walmart Inc | WMT | 0.74% |
| Abbvie Inc | ABBV | 0.72% |
| Cisco Systems Inc | CSCO | 0.68% |
| Costco Wholesale Corp | COST | 0.63% |
| Chevron Corp | CVX | 0.62% |
FAQ
How much do MGK and SPY overlap?
MGK and SPY have 52.6% overlap by weight, sharing 54 equity positions (out of 56 in MGK and 503 in SPY). The official holdings files used are dated 2026-06-30 for MGK and 2026-10-08 for SPY.
What does 52.6% overlap mean?
MGK and SPY share a material portion of their portfolio weight in the same underlying stocks. OverlapCheck labels this "moderate holdings overlap" using house ranges of 70% or more, 30% to under 70%, and under 30%. These descriptive ranges are not industry standards or investment guidance. Holdings overlap does not measure correlation, volatility, geographic or factor exposure, fees, or suitability.
Which stocks do MGK and SPY both hold?
The largest shared positions are NVIDIA Corp, Apple Inc, Microsoft Corp, Amazon.com Inc, Alphabet Inc. The top shared holdings with weights in each fund are shown on this page.
What holdings are different between MGK and SPY?
MGK has 2 positions not found in SPY, while SPY has 449 positions not found in MGK. The largest fund-only positions and their weights are shown on this page.