IUSG vs SPY: Holdings Overlap
IUSGiShares Core S&P U.S. Growth ETF
iShares · 385 holdings · $33.6B · as of 2026-03-31
SPYState Street® SPDR® S&P 500® ETF Trust
State Street (SPDR) · 504 holdings · $812.0B · as of 2026-08-06
Holdings snapshots are 128 days apart (IUSG: 2026-03-31, SPY: 2026-08-06). 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 IUSG and SPY?
iShares Core S&P U.S. Growth ETF (IUSG, by iShares) holds 385 positions; State Street® SPDR® S&P 500® ETF Trust (SPY, by State Street (SPDR)) holds 504. They have 143 holdings in common, and by portfolio weight the two funds are 64.5% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 64.5%Sum of the smaller weight of each shared holding
- Shared Holdings
- 143IUSG holds 385 · SPY holds 504
- Weight in Shared Holdings
- IUSG 95%·SPY 67%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 SPY. Showing the top 30 by weight.
Sector Breakdown
| Sector | IUSG | SPY |
|---|---|---|
| Information Technology | 46.0% | 37.6% |
| Communication Services | 16.0% | 9.7% |
| Financials | 9.6% | 12.3% |
| Consumer Discretionary | 9.4% | 9.3% |
| Health Care | 7.2% | 8.9% |
| Other Sectors | 11.5% | 22.1% |
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% |
| SPY | +3.4% | +14.0% | +23.7% | +21.2% | +13.3% | +15.3% | 0.97% |
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 SPY →
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% | 8.00% | 8.00% |
|---|---|---|---|
 AAPLApple Inc. COM | 6.08% | 6.92% | 6.08% |
 MSFTMicrosoft Corp. COM | 8.97% | 5.60% | 5.60% |
 AMZNAmazon.com, Inc. COM | 3.52% | 4.02% | 3.52% |
 GOOGLAlphabet Inc. CAP STK CL A | 5.47% | 3.16% | 3.16% |
 AVGOBroadcom Inc COM | 4.79% | 3.00% | 3.00% |
 GOOGAlphabet Inc. CAP STK CL C | 4.38% | 2.54% | 2.54% |
 METAMeta Platforms, Inc., Class A | 4.09% | 1.95% | 1.95% |
 BRK-BBerkshire Hathaway, Inc., Class B | 2.87% | 1.45% | 1.45% |
 JPMJPMorgan Chase & Co. COM | 1.76% | 1.44% | 1.44% |
 LLYEli Lilly & Co. COM | 2.38% | 1.42% | 1.42% |
 TSLATesla Inc COM | 2.12% | 1.36% | 1.36% |
 MUMicron Technology Inc. COM | 1.24% | 1.50% | 1.24% |
 AMDAdvanced Micro Devices Inc. COM | 1.08% | 1.20% | 1.08% |
 JNJJohnson & Johnson COM | 1.13% | 0.93% | 0.93% |
 VVisa, Inc., Class A | 0.91% | 0.93% | 0.91% |
 MAMasterCard Incorporated CL A | 0.89% | 0.70% | 0.70% |
 AMATApplied Materials Inc. COM | 0.89% | 0.63% | 0.63% |
 CATCaterpillar Inc COM | 1.08% | 0.59% | 0.59% |
 ABBVAbbVie Inc. COM | 0.58% | 0.65% | 0.58% |
 LRCXLam Research Corporation COM NEW | 0.87% | 0.58% | 0.58% |
 PLTRPalantir Technologies, Inc., Class A | 1.09% | 0.54% | 0.54% |
 CSCOCisco Systems, Inc. COM | 0.53% | 0.72% | 0.53% |
 GEGE Aerospace COM NEW | 0.51% | 0.59% | 0.51% |
 NFLXNetflix, Inc. COM | 1.33% | 0.47% | 0.47% |
Frequently Asked Questions
How much do IUSG and SPY overlap?
IUSG and SPY overlap by 64.5% of portfolio weight. They share 143 holdings (IUSG holds 385 positions and SPY holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IUSG and SPY?
The two portfolios are 64.5% 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 SPY?
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 SPY doesn't?
242 positions (5.3% of IUSG) are unique to IUSG, led by CCL, FTI and UTHR. In the other direction, 361 positions (32.6% of SPY) are unique to SPY.