IWR is a mid-cap U.S. equity ETF from IShares, while VOO is a U.S. large-cap core ETF from Vanguard. IWR and VOO show limited overlap, with an estimated weighted overlap of 14.54%. They share 293 holdings in the loaded dataset, led by GLW, VRT, and SNDK.
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IWR is a mid-cap U.S. equity ETF from IShares, while VOO is a U.S. large-cap core ETF from Vanguard. IWR and VOO show limited overlap, with an estimated weighted overlap of 14.54%. They share 293 holdings in the loaded dataset, led by GLW, VRT, and SNDK.
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IWR is a mid-cap U.S. equity ETF from IShares, while VOO is a U.S. large-cap core ETF from Vanguard. IWR and VOO 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 GLW, VRT, and SNDK.
IWR is a mid-cap U.S. equity ETF from IShares, while VOO is a U.S. large-cap core ETF from Vanguard. VOO is the broader fund, while IWR is the more targeted sleeve. VOO has the lower expense ratio, while IWR 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 3.64% 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, VOO is usually the wider choice. If you want the more focused tilt, IWR is the narrower expression. VOO has the lower expense ratio, while IWR charges more for its exposure.
Concentration
The top three shared holdings explain 3.64% 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 VOO.
| Holding | Name | IWR Wt. | VOO Wt. | Overlap |
|---|---|---|---|---|
| GLW | Corning, Inc. | 0.84% | 0.19% | 0.19% |
| VRT | Vertiv Holdings Co. | 0.76% | 0.17% | 0.17% |
| SNDK | Sandisk Corp. | 0.72% | 0.17% | 0.17% |
| HWM | Howmet Aerospace, Inc. | 0.73% | 0.17% | 0.17% |
| WDC | Western Digital Corp. | 0.73% | 0.16% | 0.16% |
| PWR | Quanta Services, Inc. | 0.64% | 0.15% | 0.15% |
| BNY | Bank of New York Mellon Corp. (The) | 0.65% | 0.15% | 0.15% |
| VLO | Valero Energy Corp. | 0.60% | 0.13% | 0.13% |
| CMI | Cummins, Inc. | 0.59% | 0.13% | 0.13% |
| PSX | Phillips 66 | 0.58% | 0.13% | 0.13% |
IWR is a mid-cap U.S. equity ETF from IShares, while VOO is a U.S. large-cap core ETF from Vanguard. The overlap exists because both funds allocate meaningful weight to the same holdings. In this dataset, the biggest shared drivers are GLW, VRT, and SNDK, which appear in both portfolios and push the overlap score higher.
Holding both IWR and VOO 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.
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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.