SPTM vs SPY Overlap
Both funds come from SPDR. SPTM is an equity ETF, while SPY is a U.S. large-cap core ETF. SPTM and SPY show very heavy overlap, with an estimated weighted overlap of 92.11%. They share 503 holdings in the loaded dataset, led by NVDA, AAPL, and MSFT.
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Quick Answer
Both funds come from SPDR. SPTM is an equity ETF, while SPY is a U.S. large-cap core ETF. SPTM and SPY show very heavy overlap, with an estimated weighted overlap of 92.11%. They share 503 holdings in the loaded dataset, led by NVDA, AAPL, and MSFT.
- 92.11% weighted overlap across 503 shared holdings.
- The top three shared holdings explain 19.6% of the measured overlap.
- SPY is the broader fund, while SPTM 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
- SPTM 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. SPTM is an equity ETF, while SPY is a U.S. large-cap core ETF. SPTM and SPY are closely aligned. A large share of their portfolio weight is invested in the same companies, especially NVDA, AAPL, and MSFT, which means holding both is likely to feel similar to increasing the size of one core position.
How They Differ
Both funds come from SPDR. SPTM is an equity ETF, while SPY is a U.S. large-cap core ETF. SPY is the broader fund, while SPTM is the more targeted sleeve. SPTM has the lower expense ratio, while SPY 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 19.6% 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, SPTM is the narrower expression. SPTM has the lower expense ratio, while SPY charges more for its exposure.
Overlap Driver Snapshot
Concentration
The top three shared holdings explain 19.6% 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 SPTM and SPY.
| Holding | Name | SPTM Wt. | SPY Wt. | Overlap |
|---|---|---|---|---|
| NVDA | NVIDIA CORP | 7.13% | 7.73% | 7.13% |
| AAPL | APPLE INC | 6.12% | 6.64% | 6.12% |
| MSFT | MICROSOFT CORP | 4.79% | 5.19% | 4.79% |
| AMZN | AMAZON.COM INC | 3.31% | 3.59% | 3.31% |
| GOOGL | ALPHABET INC CL A | 2.84% | 3.08% | 2.84% |
| AVGO | BROADCOM INC | 2.56% | 2.79% | 2.56% |
| GOOG | ALPHABET INC CL C | 2.27% | 2.46% | 2.27% |
| META | META PLATFORMS INC CLASS A | 2.26% | 2.45% | 2.26% |
| TSLA | TESLA INC | 1.78% | 1.93% | 1.78% |
| BRK-B | BERKSHIRE HATHAWAY INC CL B | 1.44% | 1.56% | 1.44% |
Why These ETFs Overlap
Both funds come from SPDR. SPTM is an equity 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 NVDA, AAPL, and MSFT, which appear in both portfolios and push the overlap score higher.
Holding both SPTM and SPY is usually redundant unless you have a very specific reason to tilt toward their shared holdings. In most cases, one ETF is enough.
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Frequently Asked Questions About SPTM and SPY
What is the overlap between SPTM and SPY?+
How many holdings do SPTM and SPY share?+
Is the SPTM and SPY overlap high?+
Why do SPTM and SPY overlap?+
Which ETF is broader, SPTM 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.