iShares U.S. Technology ETF (IYW) and State Street® SPDR® S&P 500® ETF Trust (SPY) share 66 holdings, with roughly 44.4% of their portfolio weight overlapping.
Weight overlap
44.4%
Shared portfolio weight
Shared holdings
66
Securities in both funds
Funds
IYW · SPY
Compared side by side
Interactive charts, sector exposure, combined allocation, and the full overlap heatmap.
Every holding both funds own, ranked by shared exposure (how much of the position they hold in common). The weight gap shows which fund tilts more heavily into it.
| Holding | In IYW | In SPY | Weight gap |
|---|---|---|---|
| NVDANVIDIA | 16.77% | 8.19% | 8.58%IYW |
| AAPLApple | 15.55% | 7.38% | 8.17%IYW |
| MSFTMicrosoft | 11.85% | 5.57% | 6.28%IYW |
| METAMETA PLATFORMS CLASS A | 3.67% | 2.58% | 1.09%IYW |
| AVGOBROADCOM | 3.11% | 2.51% | 0.60%IYW |
| GOOGLAlphabet | 2.46% | 3.03% | 0.57%SPY |
| GOOGALPHABET CL C | 1.99% | 2.43% | 0.44%SPY |
| MUMICRON TECHNOLOGY | 3.07% | 1.84% | 1.23%IYW |
| AMDADVANCED MICRO DEVICES | 3.31% | 1.55% | 1.76%IYW |
| INTCINTEL | 2.78% | 0.95% | 1.83%IYW |
| PLTRPALANTIR TECHNOLOGIES A | 2.05% | 0.67% | 1.38%IYW |
| LRCXLAM RESEARCH | 1.84% | 0.58% | 1.26%IYW |
| AMATAPPLIED MATERIALS | 1.80% | 0.57% | 1.23%IYW |
| PANWPALO ALTO NETWORKS | 1.50% | 0.48% | 1.02%IYW |
| CRWDCROWDSTRIKE HOLDINGS A | 1.25% | 0.40% | 0.85%IYW |
| SNDKSANDISK | 1.22% | 0.39% | 0.83%IYW |
| KLACKLA | 1.17% | 0.37% | 0.80%IYW |
| TXNTEXAS INSTRUMENTS | 1.18% | 0.37% | 0.81%IYW |
| ORCLORACLE | 1.14% | 0.36% | 0.78%IYW |
| MRVLMARVELL TECHNOLOGY | 1.08% | 0.34% | 0.74%IYW |
| IBMInternational Business Machines | 1.02% | 0.32% | 0.70%IYW |
| APHAMPHENOL CL A | 0.97% | 0.31% | 0.66%IYW |
| QCOMQUALCOMM | 0.98% | 0.31% | 0.67%IYW |
| CRMSALESFORCE | 0.91% | 0.29% | 0.62%IYW |
| ADIANALOG DEVICES | 0.89% | 0.28% | 0.61%IYW |
| DELLDELL TECHNOLOGIES C | 0.77% | 0.24% | 0.53%IYW |
| WDCWESTERN DIGITAL | 0.74% | 0.24% | 0.50%IYW |
| NOWSERVICENOW | 0.68% | 0.21% | 0.47%IYW |
| GLWCORNING | 0.58% | 0.18% | 0.40%IYW |
| FTNTFORTINET | 0.52% | 0.17% | 0.35%IYW |
| ADBEADOBE | 0.45% | 0.14% | 0.31%IYW |
| APPAPPLOVIN CLASS A | 0.36% | 0.13% | 0.23%IYW |
| CDNSCADENCE DESIGN SYS | 0.42% | 0.13% | 0.29%IYW |
| DDOGDATADOG CLASS A | 0.40% | 0.13% | 0.27%IYW |
| HPEHEWLETT PACKARD ENTERPRISE | 0.40% | 0.13% | 0.27%IYW |
| SNPSSYNOPSYS | 0.38% | 0.12% | 0.26%IYW |
| DASHDOORDASH A | 0.34% | 0.11% | 0.23%IYW |
| INTUINTUIT | 0.35% | 0.11% | 0.24%IYW |
| MPWRMONOLITHIC POWER SYSTEMS | 0.30% | 0.10% | 0.20%IYW |
| COHRCOHERENT | 0.26% | 0.09% | 0.17%IYW |
| TERTERADYNE | 0.29% | 0.09% | 0.20%IYW |
| ADSKAUTODESK | 0.21% | 0.07% | 0.14%IYW |
| FLEXFLEX LTD | 0.20% | 0.06% | 0.14%IYW |
| MCHPMICROCHIP TECHNOLOGY | 0.19% | 0.06% | 0.13%IYW |
| NTAPNETAPP | 0.19% | 0.06% | 0.13%IYW |
| WDAYWORKDAY CLASS A | 0.18% | 0.06% | 0.12%IYW |
| PPure Storage Class A | 0.18% | 0.06% | 0.12%IYW |
| JBLJABIL | 0.15% | 0.05% | 0.10%IYW |
| ROPROPER TECHNOLOGIES | 0.17% | 0.05% | 0.12%IYW |
| CTSHCOGNIZANT TECH SOLUTIONS A | 0.12% | 0.04% | 0.08%IYW |
| FFIVF5 | 0.12% | 0.04% | 0.08%IYW |
| HPQHP | 0.14% | 0.04% | 0.10%IYW |
| ONON SEMICONDUCTOR | 0.14% | 0.04% | 0.10%IYW |
| QQNITY ELECTRONICS | 0.12% | 0.04% | 0.08%IYW |
| SMCISUPER MICRO COMPUTER | 0.11% | 0.04% | 0.07%IYW |
| VRSNVERISIGN | 0.11% | 0.04% | 0.07%IYW |
| CDWCDW CORP/DE | 0.09% | 0.03% | 0.06%IYW |
| RDDTReddit Class A | 0.10% | 0.03% | 0.07%IYW |
| AKAMAKAMAI TECHNOLOGIES | 0.07% | 0.02% | 0.05%IYW |
| GDDYGODADDY CLASS A | 0.06% | 0.02% | 0.04%IYW |
| GENGEN DIGITAL | 0.06% | 0.02% | 0.04%IYW |
| ITGARTNER | 0.06% | 0.02% | 0.04%IYW |
| LDOSLEIDOS HOLDINGS | 0.07% | 0.02% | 0.05%IYW |
| PTC | 0.07% | 0.02% | 0.05%IYW |
| SWKSSKYWORKS SOLUTIONS | 0.06% | 0.02% | 0.04%IYW |
| TYLTYLER TECHNOLOGIES | 0.06% | 0.02% | 0.04%IYW |
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How each fund's equity holdings break down by sector, side by side — the clearest read on where the two funds tilt differently.
| Sector | In IYW | In SPY |
|---|---|---|
Technology | 90.6% | 40.0% |
Communication Services | 8.7% | 10.1% |
Financial Services | 0.2% | 11.3% |
Healthcare | 0.0% | 9.3% |
Consumer Cyclical | 0.4% | 8.8% |
Industrials | 0.1% | 7.6% |
Consumer Defensive | 0.0% | 4.4% |
Energy | 0.0% | 3.3% |
Utilities | 0.0% | 1.9% |
Real Estate | 0.0% | 1.7% |
Basic Materials | 0.0% | 1.6% |
Weights are of each fund’s classified equity holdings.
IYW
SPY
Two ETFs overlap when they hold the same underlying securities. Holding both funds can leave you more concentrated than you think — you may own the same large companies twice, at a combined weight neither fund shows on its own. The weight overlap above is the share of portfolio weight the two funds hold in common: for every security both own, it counts only the smaller of the two weights (the slice you genuinely double up on). 0% means completely different books; 100% means effectively identical funds.