Both funds come from IShares. IWR is a mid-cap U.S. equity ETF, while SOXX is a semiconductor-focused equity ETF. IWR and SOXX show limited overlap, with an estimated weighted overlap of 1.63%. They share 8 holdings in the loaded dataset, led by MPWR, TER, and MCHP.
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Quick Answer
Both funds come from IShares. IWR is a mid-cap U.S. equity ETF, while SOXX is a semiconductor-focused equity ETF. IWR and SOXX show limited overlap, with an estimated weighted overlap of 1.63%. They share 8 holdings in the loaded dataset, led by MPWR, TER, and MCHP.
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Both funds come from IShares. IWR is a mid-cap U.S. equity ETF, while SOXX is a semiconductor-focused equity ETF. IWR and SOXX do not own much of the same portfolio weight. That usually means you are combining different parts of the market, with only a small amount of duplication through names like MPWR, TER, and MCHP.
Both funds come from IShares. IWR is a mid-cap U.S. equity ETF, while SOXX is a semiconductor-focused equity ETF. IWR is the broader fund, while SOXX is the more targeted sleeve. IWR has the lower expense ratio, while SOXX charges more for its exposure.
The overlap is driven by a relatively small set of large shared positions. The top three shared holdings account for 62.27% of the score, which means the result is heavily influenced by the biggest common weights rather than a long tail of tiny positions.
If you want the broader portfolio building block, IWR is usually the wider choice. If you want the more focused tilt, SOXX is the narrower expression. IWR has the lower expense ratio, while SOXX charges more for its exposure.
Concentration
The top three shared holdings explain 62.27% of the full overlap score.
That helps show whether the score comes from a handful of giant shared positions or from a broader mix of common holdings.
Shared Sector Tilt
Sector tags are not consistently available for the biggest shared positions in this dataset, so this comparison leans more on the specific holdings than on sector labels.
These are the holdings contributing the most to the overlap score between IWR and SOXX.
| Holding | Name | IWR Wt. | SOXX Wt. | Overlap |
|---|---|---|---|---|
| MPWR | MONOLITHIC POWER SYSTEMS INC | 0.38% | 3.96% | 0.38% |
| TER | TERADYNE INC | 0.37% | 4.20% | 0.37% |
| MCHP | MICROCHIP TECHNOLOGY INC | 0.27% | 3.08% | 0.27% |
| ON | ON SEMICONDUCTOR CORP | 0.19% | 2.13% | 0.19% |
| ENTG | ENTEGRIS INC | 0.14% | 1.57% | 0.14% |
| ALAB | ASTERA LABS INC | 0.11% | 1.39% | 0.11% |
| MTSI | MACOM TECHNOLOGY SOLUTIONS INC | 0.11% | 1.30% | 0.11% |
| SWKS | SKYWORKS SOLUTIONS INC | 0.06% | 0.73% | 0.06% |
Both funds come from IShares. IWR is a mid-cap U.S. equity ETF, while SOXX is a semiconductor-focused equity ETF. The overlap exists because both funds allocate meaningful weight to the same holdings. In this dataset, the biggest shared drivers are MPWR, TER, and MCHP, which appear in both portfolios and push the overlap score higher.
Holding both IWR and SOXX can make sense if you want exposure to different sleeves of the market. The overlap is small enough that both funds may still improve diversification.
A straightforward approach used by portfolio analysts.
For every stock that appears in both ETFs, we take the smaller of the two weights. Adding up all those minimums gives the total overlap percentage. A score of 100% means the two ETFs hold the exact same stocks in the same proportions.
Want the full explanation? Read the methodology page.