ETF comparison
MGC vs SPY
Both US Large Cap.
Vanguard Morningstar Mega Cap ETF · State Street SPDR S&P 500 ETF Trust
Holdings overlap
169 positions appear in both funds. Buying equal dollars of MGC and SPY would leave roughly 81.8% of each dollar exposed to the same underlying securities.
Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for why.
Cost difference
MGC is 4 bps cheaper than SPY. On a $100,000 position that's about $44/yr more in fees for SPY.
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with MGC vs SPY.
Top shared holdings
169 shared in total| # | Holding | In MGC | In SPY | Overlap |
|---|---|---|---|---|
| 1 | NVIDIA Corp | 9.10% | 8.50% | 8.50% |
| 2 | Apple Inc | 8.55% | 7.32% | 7.32% |
| 3 | Microsoft Corp | 6.24% | 5.77% | 5.77% |
| 4 | Amazon.com Inc | 4.88% | 3.71% | 3.71% |
| 5 | Alphabet Inc | 4.13% | 3.03% | 3.03% |
| 6 | Broadcom Inc | 3.95% | 2.54% | 2.54% |
| 7 | Alphabet Inc | 3.25% | 2.43% | 2.43% |
| 8 | Meta Platforms Inc | 2.58% | 2.41% | 2.41% |
| 9 | Micron Technology Inc | 2.04% | 1.82% | 1.82% |
| 10 | Tesla Inc | 2.29% | 1.57% | 1.57% |
| 11 | Advanced Micro Devices Inc | 1.57% | 1.55% | 1.55% |
| 12 | Berkshire Hathaway Inc | 1.53% | 1.41% | 1.41% |
Only in MGC
4 total- Exxon Mobil Corp 1.13%
- Honeywell International Inc 0.28%
- Berkshire Hathaway Inc 0.11%
- Snowflake Inc 0.08%
Only in SPY
336 total- EXXONMOBIL HOLDINGS CORP 1.01%
- SEAGATE TECHNOLOGY HOLDINGS 0.29%
- WESTERN DIGITAL CORP 0.22%
- MARATHON PETROLEUM CORP 0.18%
- VALERO ENERGY CORP 0.18%
- PHILLIPS 66 0.16%
- QUANTA SERVICES INC 0.15%
- VERTIV HOLDINGS CO A 0.15%
- LUMENTUM HOLDINGS INC 0.14%
- DATADOG INC CLASS A 0.14%
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- SPY vs ESGV · Vanguard ESG U.S. Stock ETF 81.0%
- SPY vs ESGU · iShares ESG Aware MSCI USA ETF 76.3%
- SPY vs GSLC · Goldman Sachs ActiveBeta U.S. Large Cap Equity ETF 73.1%
- SPY vs OEF · iShares S&P 100 ETF 71.3%
- SPY vs AVUS · Avantis US Equity ETF 69.0%
- SPY vs VOOG · Vanguard S&P 500 Growth Index Fund ETF Shares 66.1%
Percentages are holdings overlap with the named fund.
Open MGC or SPY at a brokerage
Both funds trade commission-free at major US brokerages.
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.
Holdings overlap is the sum of min(weight_a, weight_b) over positions
matched on ISIN (CUSIP fallback). Methodology: see
/methodology/.
Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.