DIA vs SPY Overlap
Both funds come from SPDR. DIA is an industrials ETF, while SPY is a U.S. large-cap core ETF. DIA and SPY show meaningful overlap, with an estimated weighted overlap of 26.25%. They share 30 holdings in the loaded dataset, led by MSFT, AAPL, and AMZN.
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Quick Answer
Both funds come from SPDR. DIA is an industrials ETF, while SPY is a U.S. large-cap core ETF. DIA and SPY show meaningful overlap, with an estimated weighted overlap of 26.25%. They share 30 holdings in the loaded dataset, led by MSFT, AAPL, and AMZN.
- 26.25% weighted overlap across 30 shared holdings.
- The top three shared holdings explain 43.1% of the measured overlap.
- SPY is the broader fund, while DIA is more targeted.
- 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
- DIA holdings
- Mar 12, 2026
- SPY holdings
- Mar 12, 2026
- Overlap computed
- Mar 13, 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 SPDR. DIA is an industrials ETF, while SPY is a U.S. large-cap core ETF. DIA and SPY overlap enough to matter, but they still bring different exposures to a portfolio. The overlap is concentrated in holdings such as MSFT, AAPL, and AMZN, which explains why the score lands at 26.25%.
How They Differ
Both funds come from SPDR. DIA is an industrials ETF, while SPY is a U.S. large-cap core ETF. SPY is the broader fund, while DIA is the more targeted sleeve. SPY has the lower expense ratio, while DIA 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 43.1% 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
If you want the broader portfolio building block, SPY is usually the wider choice. If you want the more focused tilt, DIA is the narrower expression. SPY has the lower expense ratio, while DIA charges more for its exposure.
Overlap Driver Snapshot
Concentration
The top three shared holdings explain 43.1% 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 DIA and SPY.
| Holding | Name | DIA Wt. | SPY Wt. | Overlap |
|---|---|---|---|---|
| MSFT | MICROSOFT CORP | 5.23% | 5.19% | 5.19% |
| AAPL | APPLE INC | 3.36% | 6.64% | 3.36% |
| AMZN | AMAZON.COM INC | 2.76% | 3.59% | 2.76% |
| NVDA | NVIDIA CORP | 2.38% | 7.73% | 2.38% |
| JPM | JPMORGAN CHASE + CO | 3.72% | 1.35% | 1.35% |
| JNJ | JOHNSON + JOHNSON | 3.14% | 1.01% | 1.01% |
| WMT | WALMART INC | 1.61% | 0.94% | 0.94% |
| V | VISA INC CLASS A SHARES | 4.05% | 0.91% | 0.91% |
| PG | PROCTER + GAMBLE CO/THE | 2.01% | 0.63% | 0.63% |
| HD | HOME DEPOT INC | 4.60% | 0.61% | 0.61% |
Why These ETFs Overlap
Both funds come from SPDR. DIA is an industrials ETF, while SPY is a U.S. large-cap core ETF. The overlap exists because both funds allocate meaningful weight to the same holdings. In this dataset, the biggest shared drivers are MSFT, AAPL, and AMZN, which appear in both portfolios and push the overlap score higher.
Holding both DIA and SPY 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 DIA and SPY
What is the overlap between DIA and SPY?+
How many holdings do DIA and SPY share?+
Is the DIA and SPY overlap high?+
Why do DIA and SPY overlap?+
Which ETF is broader, DIA or SPY?+
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.