ITOT vs MGC: Holdings Overlap
ITOTiShares Core S&P Total U.S. Stock Market ETF
iShares · 2487 holdings · $97.6B · as of 2026-03-31
MGCVanguard Mega Cap Index Fund
Vanguard · 173 holdings · $10.3B · as of 2026-05-31
Holdings snapshots are 61 days apart (ITOT: 2026-03-31, MGC: 2026-05-31). 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 ITOT and MGC?
iShares Core S&P Total U.S. Stock Market ETF (ITOT, by iShares) holds 2487 positions; Vanguard Mega Cap Index Fund (MGC, by Vanguard) holds 173. They have 172 holdings in common, and by portfolio weight the two funds are 72.7% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 72.7%Sum of the smaller weight of each shared holding
- Shared Holdings
- 172ITOT holds 2487 · MGC holds 173
- Weight in Shared Holdings
- ITOT 73%·MGC 100%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 ITOT
2315 of 2487 positions (26.3% of the fund) are not held by MGC. Showing the top 30 by weight.
Sector Breakdown
| Sector | ITOT | MGC |
|---|---|---|
| Information Technology | 30.8% | 42.4% |
| Financials | 12.9% | 10.7% |
| Communication Services | 9.7% | 12.2% |
| Industrials | 10.2% | 6.4% |
| Health Care | 9.9% | 8.6% |
| Other Sectors | 26.2% | 19.3% |
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 |
|---|---|---|---|---|---|---|---|
| ITOT | +3.3% | +14.6% | +24.1% | +20.9% | +12.3% | +14.9% | 0.97% |
| MGC | +3.6% | +13.6% | +24.3% | +22.7% | +14.0% | +16.2% | 0.89% |
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 ITOT vs MGC →
Shared Holdings(172)
The top 10 shared positions account for 44% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 6.69% | 9.10% | 6.69% |
|---|---|---|---|
 AAPLApple Inc. COM | 5.88% | 8.55% | 5.88% |
 MSFTMicrosoft Corp. COM | 4.34% | 6.24% | 4.34% |
 AMZNAmazon.com, Inc. COM | 3.21% | 4.88% | 3.21% |
 GOOGLAlphabet Inc. CAP STK CL A | 2.64% | 4.13% | 2.64% |
 AVGOBroadcom Inc COM | 2.32% | 3.95% | 2.32% |
 GOOGAlphabet Inc. CAP STK CL C | 2.12% | 3.25% | 2.12% |
 METAMeta Platforms, Inc., Class A | 1.98% | 2.58% | 1.98% |
 TSLATesla Inc COM | 1.65% | 2.29% | 1.65% |
 BRK-BBerkshire Hathaway, Inc., Class B | 1.39% | 1.53% | 1.39% |
 JPMJPMorgan Chase & Co. COM | 1.25% | 1.41% | 1.25% |
 LLYEli Lilly & Co. COM | 1.15% | 1.75% | 1.15% |
 XOMExxon Mobil Corp. COM | 1.12% | 1.13% | 1.12% |
 JNJJohnson & Johnson COM | 0.93% | 1.01% | 0.93% |
 WMTWalmart Inc COM | 0.86% | 0.95% | 0.86% |
 VVisa, Inc., Class A | 0.80% | 1.02% | 0.80% |
 COSTCostco Wholesale Corporation COM | 0.70% | 0.79% | 0.70% |
 MAMasterCard Incorporated CL A | 0.64% | 0.73% | 0.64% |
 NFLXNetflix, Inc. COM | 0.64% | 0.68% | 0.64% |
 CVXChevron Corp. COM | 0.61% | 0.65% | 0.61% |
 ABBVAbbVie Inc. COM | 0.61% | 0.72% | 0.61% |
 MUMicron Technology Inc. COM | 0.60% | 2.04% | 0.60% |
 PGThe Procter & Gamble Co. COM | 0.53% | 0.62% | 0.53% |
 PLTRPalantir Technologies, Inc., Class A | 0.53% | 0.64% | 0.53% |
 AMDAdvanced Micro Devices Inc. COM | 0.52% | 1.57% | 0.52% |
Frequently Asked Questions
How much do ITOT and MGC overlap?
ITOT and MGC overlap by 72.7% of portfolio weight. They share 172 holdings (ITOT holds 2487 positions and MGC holds 173), based on each fund's latest SEC-reported holdings.
Is it redundant to own both ITOT and MGC?
The two portfolios are 72.7% 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 ITOT and MGC?
The largest positions held by both funds are NVDA, AAPL, MSFT, AMZN and GOOGL. Together the top 10 shared positions account for 44% of the total overlap.
What does ITOT own that MGC doesn't?
2315 positions (26.3% of ITOT) are unique to ITOT, led by VRT, HWM and WDC. In the other direction, 1 positions (0.1% of MGC) are unique to MGC.