IWD vs VO Overlap
IWD is a U.S. value equity ETF from IShares, while VO is a mid-cap U.S. equity ETF from Vanguard. IWD and VO show meaningful overlap, with an estimated weighted overlap of 22.97%. They share 224 holdings in the loaded dataset, led by NEM, GLW, and CEG.
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Quick Answer
IWD is a U.S. value equity ETF from IShares, while VO is a mid-cap U.S. equity ETF from Vanguard. IWD and VO show meaningful overlap, with an estimated weighted overlap of 22.97%. They share 224 holdings in the loaded dataset, led by NEM, GLW, and CEG.
- 22.97% weighted overlap across 224 shared holdings.
- The top three shared holdings explain 4.73% of the measured overlap.
- IWD and VO are closer in breadth than a broad-vs-niche ETF pair.
- The overlap is mostly explained by the top shared positions rather than sector labels alone.
- Holding both may add less diversification than the fund names imply.
Data Freshness
- IWD holdings
- Mar 12, 2026
- VO holdings
- Mar 12, 2026
- Overlap computed
- Mar 15, 2026
- Data source
- Financial Modeling Prep
Review the methodology for the overlap formula and refresh policy.
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About These ETFs
What Stands Out In This Comparison
What This Means
IWD is a U.S. value equity ETF from IShares, while VO is a mid-cap U.S. equity ETF from Vanguard. IWD and VO overlap enough to matter, but they still bring different exposures to a portfolio. The overlap is concentrated in holdings such as NEM, GLW, and CEG, which explains why the score lands at 22.97%.
How They Differ
IWD is a U.S. value equity ETF from IShares, while VO is a mid-cap U.S. equity ETF from Vanguard. Neither fund clearly dominates on breadth, so the practical difference is more about weighting, index construction, and cost. VO has the lower expense ratio, while IWD charges more for its exposure.
What Drives The Overlap
The overlap is driven by a relatively small set of large shared positions. The top three shared holdings account for 4.73% of the score, which means the result is heavily influenced by the biggest common weights rather than a long tail of tiny positions.
When One May Fit Better
Because IWD and VO are closer in breadth, the better fit usually comes down to index methodology, issuer preference, and cost. VO has the lower expense ratio, while IWD charges more for its exposure.
Overlap Driver Snapshot
Concentration
The top three shared holdings explain 4.73% 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.
Top Shared Holdings
These are the holdings contributing the most to the overlap score between IWD and VO.
| Holding | Name | IWD Wt. | VO Wt. | Overlap |
|---|---|---|---|---|
| NEM | NEWMONT | 0.42% | 1.31% | 0.42% |
| GLW | CORNING INC | 0.34% | 0.85% | 0.34% |
| CEG | CONSTELLATION ENERGY CORP | 0.32% | 0.94% | 0.32% |
| WDC | WESTERN DIGITAL CORP | 0.29% | 0.91% | 0.29% |
| WMB | WILLIAMS INC | 0.28% | 0.44% | 0.28% |
| FDX | FEDEX CORP | 0.25% | 0.36% | 0.25% |
| CMI | CUMMINS INC | 0.25% | 0.85% | 0.25% |
| MRVL | MARVELL TECHNOLOGY INC | 0.24% | 0.36% | 0.24% |
| GM | GENERAL MOTORS | 0.23% | 0.84% | 0.23% |
| LHX | L3HARRIS TECHNOLOGIES INC | 0.22% | 0.68% | 0.22% |
Why These ETFs Overlap
IWD is a U.S. value equity ETF from IShares, while VO is a mid-cap U.S. equity ETF from Vanguard. The overlap exists because both funds allocate meaningful weight to the same holdings. In this dataset, the biggest shared drivers are NEM, GLW, and CEG, which appear in both portfolios and push the overlap score higher.
Holding both IWD and VO can still be reasonable, but you should expect some duplication. The decision comes down to whether the non-overlapping parts of each ETF are important enough for your strategy.
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Frequently Asked Questions About IWD and VO
What is the overlap between IWD and VO?+
How many holdings do IWD and VO share?+
Is the IWD and VO overlap high?+
Why do IWD and VO overlap?+
Which ETF is broader, IWD or VO?+
How Overlap Is Calculated
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.