MGC vs VOO: Holdings Overlap
MGCVanguard Mega Cap Index Fund
Vanguard · 173 holdings · $10.3B · as of 2026-05-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
Holdings snapshots are 61 days apart (MGC: 2026-05-31, VOO: 2026-03-31). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are MGC and VOO?
Vanguard Mega Cap Index Fund (MGC, by Vanguard) holds 173 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. They have 170 holdings in common, and by portfolio weight the two funds are 81.0% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 81.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 170MGC holds 173 · VOO holds 504
- Weight in Shared Holdings
- MGC 99%·VOO 83%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in MGC
3 of 173 positions (0.3% of the fund) are not held by VOO.
Only in VOO
334 of 504 positions (17.0% of the fund) are not held by MGC. Showing the top 30 by weight.
Sector Breakdown
| Sector | MGC | VOO |
|---|---|---|
| Information Technology | 42.4% | 32.7% |
| Financials | 10.7% | 12.4% |
| Communication Services | 12.2% | 10.5% |
| Consumer Discretionary | 9.7% | 9.9% |
| Health Care | 8.6% | 9.5% |
| Other Sectors | 16.0% | 24.9% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| MGC | +3.6% | +13.6% | +24.3% | +22.7% | +14.0% | +16.2% | 0.89% |
| VOO | +3.4% | +14.0% | +23.7% | +21.3% | +13.4% | +15.4% | 1.03% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in MGC vs VOO →
Shared Holdings(170)
The top 10 shared positions account for 45% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 9.10% | 7.58% | 7.58% |
|---|---|---|---|
 AAPLApple Inc. COM | 8.55% | 6.66% | 6.66% |
 MSFTMicrosoft Corp. COM | 6.24% | 4.91% | 4.91% |
 AMZNAmazon.com, Inc. COM | 4.88% | 3.64% | 3.64% |
 GOOGLAlphabet Inc. CAP STK CL A | 4.13% | 2.99% | 2.99% |
 AVGOBroadcom Inc COM | 3.95% | 2.62% | 2.62% |
 GOOGAlphabet Inc. CAP STK CL C | 3.25% | 2.40% | 2.40% |
 METAMeta Platforms, Inc., Class A | 2.58% | 2.24% | 2.24% |
 TSLATesla Inc COM | 2.29% | 1.87% | 1.87% |
 BRK-BBerkshire Hathaway, Inc., Class B | 1.53% | 1.57% | 1.53% |
 JPMJPMorgan Chase & Co. COM | 1.41% | 1.34% | 1.34% |
 LLYEli Lilly & Co. COM | 1.75% | 1.30% | 1.30% |
 XOMExxon Mobil Corp. COM | 1.13% | 1.27% | 1.13% |
 JNJJohnson & Johnson COM | 1.01% | 1.05% | 1.01% |
 WMTWalmart Inc COM | 0.95% | 0.97% | 0.95% |
 VVisa, Inc., Class A | 1.02% | 0.89% | 0.89% |
 COSTCostco Wholesale Corporation COM | 0.79% | 0.79% | 0.79% |
 MAMasterCard Incorporated CL A | 0.73% | 0.73% | 0.73% |
 ABBVAbbVie Inc. COM | 0.72% | 0.69% | 0.69% |
 MUMicron Technology Inc. COM | 2.04% | 0.68% | 0.68% |
 NFLXNetflix, Inc. COM | 0.68% | 0.73% | 0.68% |
 CVXChevron Corp. COM | 0.65% | 0.69% | 0.65% |
 PGThe Procter & Gamble Co. COM | 0.62% | 0.60% | 0.60% |
 PLTRPalantir Technologies, Inc., Class A | 0.64% | 0.60% | 0.60% |
 AMDAdvanced Micro Devices Inc. COM | 1.57% | 0.59% | 0.59% |
Frequently Asked Questions
How much do MGC and VOO overlap?
MGC and VOO overlap by 81.0% of portfolio weight. They share 170 holdings (MGC holds 173 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both MGC and VOO?
The two portfolios are 81.0% identical by weight. Owning both mostly doubles down on the shared core rather than diversifying: the same large positions drive both funds.
What are the biggest shared holdings of MGC and VOO?
The largest positions held by both funds are NVDA, AAPL, MSFT, AMZN and GOOGL. Together the top 10 shared positions account for 45% of the total overlap.
What does MGC own that VOO doesn't?
3 positions (0.3% of MGC) are unique to MGC, led by MRVL, BRK-A and SNOW. In the other direction, 334 positions (17.0% of VOO) are unique to VOO.