IUSG vs VOO: Holdings Overlap
IUSGiShares Core S&P U.S. Growth ETF
iShares · 385 holdings · $33.6B · as of 2026-03-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
How similar are IUSG and VOO?
iShares Core S&P U.S. Growth ETF (IUSG, by iShares) holds 385 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. They have 143 holdings in common, and by portfolio weight the two funds are 63.0% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 63.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 143IUSG holds 385 · VOO holds 504
- Weight in Shared Holdings
- IUSG 95%·VOO 64%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 IUSG
242 of 385 positions (5.3% of the fund) are not held by VOO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IUSG | VOO |
|---|---|---|
| Information Technology | 46.0% | 32.7% |
| Communication Services | 16.0% | 10.5% |
| Financials | 9.6% | 12.4% |
| Consumer Discretionary | 9.4% | 9.9% |
| Health Care | 7.2% | 9.5% |
| Other Sectors | 11.5% | 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 |
|---|---|---|---|---|---|---|---|
| IUSG | +4.3% | +15.9% | +25.6% | +26.2% | +13.9% | +17.5% | 0.48% |
| 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 IUSG vs VOO →
Shared Holdings(143)
The top 10 shared positions account for 57% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 13.84% | 7.58% | 7.58% |
|---|---|---|---|
 AAPLApple Inc. COM | 6.08% | 6.66% | 6.08% |
 MSFTMicrosoft Corp. COM | 8.97% | 4.91% | 4.91% |
 AMZNAmazon.com, Inc. COM | 3.52% | 3.64% | 3.52% |
 GOOGLAlphabet Inc. CAP STK CL A | 5.47% | 2.99% | 2.99% |
 AVGOBroadcom Inc COM | 4.79% | 2.62% | 2.62% |
 GOOGAlphabet Inc. CAP STK CL C | 4.38% | 2.40% | 2.40% |
 METAMeta Platforms, Inc., Class A | 4.09% | 2.24% | 2.24% |
 TSLATesla Inc COM | 2.12% | 1.87% | 1.87% |
 BRK-BBerkshire Hathaway, Inc., Class B | 2.87% | 1.57% | 1.57% |
 JPMJPMorgan Chase & Co. COM | 1.76% | 1.34% | 1.34% |
 LLYEli Lilly & Co. COM | 2.38% | 1.30% | 1.30% |
 JNJJohnson & Johnson COM | 1.13% | 1.05% | 1.05% |
 VVisa, Inc., Class A | 0.91% | 0.89% | 0.89% |
 MAMasterCard Incorporated CL A | 0.89% | 0.73% | 0.73% |
 NFLXNetflix, Inc. COM | 1.33% | 0.73% | 0.73% |
 MUMicron Technology Inc. COM | 1.24% | 0.68% | 0.68% |
 PLTRPalantir Technologies, Inc., Class A | 1.09% | 0.60% | 0.60% |
 AMDAdvanced Micro Devices Inc. COM | 1.08% | 0.59% | 0.59% |
 CATCaterpillar Inc COM | 1.08% | 0.59% | 0.59% |
 ABBVAbbVie Inc. COM | 0.58% | 0.69% | 0.58% |
 CSCOCisco Systems, Inc. COM | 0.53% | 0.55% | 0.53% |
 GEGE Aerospace COM NEW | 0.51% | 0.53% | 0.51% |
 AMATApplied Materials Inc. COM | 0.89% | 0.48% | 0.48% |
 LRCXLam Research Corporation COM NEW | 0.87% | 0.48% | 0.48% |
Frequently Asked Questions
How much do IUSG and VOO overlap?
IUSG and VOO overlap by 63.0% of portfolio weight. They share 143 holdings (IUSG holds 385 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IUSG and VOO?
The two portfolios are 63.0% 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 IUSG and VOO?
The largest positions held by both funds are NVDA, AAPL, MSFT, AMZN and GOOGL. Together the top 10 shared positions account for 57% of the total overlap.
What does IUSG own that VOO doesn't?
242 positions (5.3% of IUSG) are unique to IUSG, led by FTI, CASY and UTHR. In the other direction, 361 positions (35.3% of VOO) are unique to VOO.