ETF comparison
MGC vs SPYM
Both US Large Cap.
Vanguard Morningstar Mega Cap ETF · State Street SPDR Portfolio S&P 500 ETF
Holdings overlap
170 positions appear in both funds. Buying equal dollars of MGC and SPYM would leave roughly 81.4% 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
SPYM is 3 bps cheaper than MGC. On a $100,000 position that's about $30/yr more in fees for MGC.
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 SPYM.
Top shared holdings
170 shared in total| # | Holding | In MGC | In SPYM | Overlap |
|---|---|---|---|---|
| 1 | NVIDIA Corp | 9.10% | 7.51% | 7.51% |
| 2 | Apple Inc | 8.55% | 6.59% | 6.59% |
| 3 | Microsoft Corp | 6.24% | 4.29% | 4.29% |
| 4 | Amazon.com Inc | 4.88% | 3.62% | 3.62% |
| 5 | Alphabet Inc | 4.13% | 3.25% | 3.25% |
| 6 | Broadcom Inc | 3.95% | 2.77% | 2.77% |
| 7 | Alphabet Inc | 3.25% | 2.59% | 2.59% |
| 8 | Micron Technology Inc | 2.04% | 2.02% | 2.02% |
| 9 | Meta Platforms Inc | 2.58% | 1.92% | 1.92% |
| 10 | Tesla Inc | 2.29% | 1.83% | 1.83% |
| 11 | Eli Lilly & Co | 1.75% | 1.47% | 1.47% |
| 12 | Advanced Micro Devices Inc | 1.57% | 1.47% | 1.47% |
Only in MGC
3 total- Honeywell International Inc 0.28%
- Berkshire Hathaway Inc 0.11%
- Snowflake Inc 0.08%
Only in SPYM
336 total- Western Digital Corp 0.34%
- Seagate Technology Holdings PLC 0.34%
- Vertiv Holdings Co 0.20%
- Quanta Services Inc 0.17%
- Howmet Aerospace Inc 0.17%
- Cummins Inc 0.15%
- Datadog Inc 0.13%
- Constellation Energy Corp 0.12%
- Robinhood Markets Inc 0.12%
- Royal Caribbean Cruises Ltd 0.12%
Related comparisons
More comparisons with MGC
More comparisons with SPYM
- SPYM vs ESGV · Vanguard ESG U.S. Stock ETF 80.1%
- SPYM vs ESGU · iShares ESG Aware MSCI USA ETF 77.7%
- SPYM vs GSLC · Goldman Sachs ActiveBeta U.S. Large Cap Equity ETF 75.0%
- SPYM vs OEF · iShares S&P 100 ETF 71.6%
- SPYM vs AVUS · Avantis US Equity ETF 71.4%
- SPYM vs FELC · Fidelity Enhanced Large Cap Core ETF 67.4%
Percentages are holdings overlap with the named fund.
Open MGC or SPYM 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.