IWB vs MTUM Overlap
Both funds come from IShares. IWB is an equity ETF, while MTUM is an equity ETF. IWB and MTUM show meaningful overlap, with an estimated weighted overlap of 31.44%. They share 117 holdings in the loaded dataset, led by NVDA, GOOGL, and AVGO.
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Quick Answer
Both funds come from IShares. IWB is an equity ETF, while MTUM is an equity ETF. IWB and MTUM show meaningful overlap, with an estimated weighted overlap of 31.44%. They share 117 holdings in the loaded dataset, led by NVDA, GOOGL, and AVGO.
- 31.44% weighted overlap across 117 shared holdings.
- The top three shared holdings explain 32.25% of the measured overlap.
- IWB and MTUM 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
- IWB holdings
- Mar 12, 2026
- MTUM 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
Both funds come from IShares. IWB is an equity ETF, while MTUM is an equity ETF. IWB and MTUM overlap enough to matter, but they still bring different exposures to a portfolio. The overlap is concentrated in holdings such as NVDA, GOOGL, and AVGO, which explains why the score lands at 31.44%.
How They Differ
Both funds come from IShares. IWB is an equity ETF, while MTUM is an equity ETF. Neither fund clearly dominates on breadth, so the practical difference is more about weighting, index construction, and cost. IWB and MTUM are priced very similarly on expense ratio.
What Drives The Overlap
The overlap is driven by a relatively small set of large shared positions. The top three shared holdings account for 32.25% 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 IWB and MTUM are closer in breadth, the better fit usually comes down to index methodology, issuer preference, and cost. IWB and MTUM are priced very similarly on expense ratio.
Overlap Driver Snapshot
Concentration
The top three shared holdings explain 32.25% 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 IWB and MTUM.
| Holding | Name | IWB Wt. | MTUM Wt. | Overlap |
|---|---|---|---|---|
| NVDA | NVIDIA CORP | 6.95% | 4.91% | 4.91% |
| GOOGL | ALPHABET INC CLASS A | 2.87% | 2.69% | 2.69% |
| AVGO | BROADCOM INC | 2.54% | 5.07% | 2.54% |
| GOOG | ALPHABET INC CLASS C | 2.33% | 2.19% | 2.19% |
| JPM | JPMORGAN CHASE & CO | 1.26% | 3.02% | 1.26% |
| XOM | EXXON MOBIL CORP | 1.00% | 3.77% | 1.00% |
| JNJ | JOHNSON & JOHNSON | 0.94% | 4.55% | 0.94% |
| WMT | WALMART INC | 0.87% | 2.99% | 0.87% |
| MU | MICRON TECHNOLOGY INC | 0.72% | 4.96% | 0.72% |
| GE | GE AEROSPACE | 0.55% | 2.45% | 0.55% |
Why These ETFs Overlap
Both funds come from IShares. IWB is an equity ETF, while MTUM is an equity ETF. The overlap exists because both funds allocate meaningful weight to the same holdings. In this dataset, the biggest shared drivers are NVDA, GOOGL, and AVGO, which appear in both portfolios and push the overlap score higher.
Holding both IWB and MTUM 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 IWB and MTUM
What is the overlap between IWB and MTUM?+
How many holdings do IWB and MTUM share?+
Is the IWB and MTUM overlap high?+
Why do IWB and MTUM overlap?+
Which ETF is broader, IWB or MTUM?+
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.