IGM vs SPY: Holdings Overlap
IGMiShares Expanded Tech Sector ETF
iShares · 288 holdings · $10.7B · 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 (IGM: 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 IGM and SPY?
iShares Expanded Tech Sector ETF (IGM, by iShares) holds 288 positions; State Street® SPDR® S&P 500® ETF Trust (SPY, by State Street (SPDR)) holds 504. They have 79 holdings in common, and by portfolio weight the two funds are 45.9% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 45.9%Sum of the smaller weight of each shared holding
- Shared Holdings
- 79IGM holds 288 · SPY holds 504
- Weight in Shared Holdings
- IGM 91%·SPY 46%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 IGM
209 of 288 positions (9.2% of the fund) are not held by SPY. Showing the top 30 by weight.
Sector Breakdown
| Sector | IGM | SPY |
|---|---|---|
| Information Technology | 82.6% | 37.6% |
| Communication Services | 17.1% | 9.7% |
| Financials | 0.0% | 12.3% |
| Consumer Discretionary | 0.0% | 9.3% |
| Health Care | 0.0% | 8.9% |
| Other Sectors | 0.0% | 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 |
|---|---|---|---|---|---|---|---|
| IGM | +4.5% | +26.9% | +40.7% | +35.3% | +19.1% | +23.9% | 0.13% |
| 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 IGM vs SPY →
Shared Holdings(79)
The top 10 shared positions account for 75% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 8.44% | 8.00% | 8.00% |
|---|---|---|---|
 AAPLApple Inc. COM | 8.76% | 6.92% | 6.92% |
 MSFTMicrosoft Corp. COM | 8.23% | 5.60% | 5.60% |
 GOOGLAlphabet Inc. CAP STK CL A | 4.65% | 3.16% | 3.16% |
 AVGOBroadcom Inc COM | 8.16% | 3.00% | 3.00% |
 GOOGAlphabet Inc. CAP STK CL C | 3.73% | 2.54% | 2.54% |
 METAMeta Platforms, Inc., Class A | 4.17% | 1.95% | 1.95% |
 MUMicron Technology Inc. COM | 2.51% | 1.50% | 1.50% |
 AMDAdvanced Micro Devices Inc. COM | 2.19% | 1.20% | 1.20% |
 CSCOCisco Systems, Inc. COM | 2.02% | 0.72% | 0.72% |
 INTCIntel Corporation COM | 1.37% | 0.71% | 0.71% |
 AMATApplied Materials Inc. COM | 1.79% | 0.63% | 0.63% |
 LRCXLam Research Corporation COM NEW | 1.76% | 0.58% | 0.58% |
 PLTRPalantir Technologies, Inc., Class A | 2.20% | 0.54% | 0.54% |
 NFLXNetflix, Inc. COM | 2.68% | 0.47% | 0.47% |
 PANWPalo Alto Networks Inc COM | 0.85% | 0.44% | 0.44% |
 TXNTexas Instruments Inc. COM | 1.16% | 0.38% | 0.38% |
 KLACKLA Corp. COM NEW | 1.27% | 0.38% | 0.38% |
 ORCLOracle Corp. COM | 1.65% | 0.37% | 0.37% |
 IBMInternational Business Machines Corp. COM | 1.49% | 0.33% | 0.33% |
 CRWDCrowdstrike Holdings, Inc., Class A | 0.65% | 0.32% | 0.32% |
 APHAmphenol Corporation CL A | 1.02% | 0.32% | 0.32% |
 ANETArista Networks Inc COM SHS | 0.84% | 0.30% | 0.30% |
 STXSeagate Technology Holdings PLC ORD SHS | 0.56% | 0.29% | 0.29% |
 SNDKSandisk Corporation COM | 0.62% | 0.28% | 0.28% |
Frequently Asked Questions
How much do IGM and SPY overlap?
IGM and SPY overlap by 45.9% of portfolio weight. They share 79 holdings (IGM holds 288 positions and SPY holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IGM and SPY?
The two portfolios are 45.9% identical by weight. Owning both is defensible: they share a meaningful core, but each fund adds exposure the other lacks.
What are the biggest shared holdings of IGM and SPY?
The largest positions held by both funds are NVDA, AAPL, MSFT, GOOGL and AVGO. Together the top 10 shared positions account for 75% of the total overlap.
What does IGM own that SPY doesn't?
209 positions (9.2% of IGM) are unique to IGM, led by SHOP, NET and SNOW. In the other direction, 425 positions (54.0% of SPY) are unique to SPY.