SPTM vs VOO Overlap
SPTM is an equity ETF from SPDR, while VOO is a U.S. large-cap core ETF from Vanguard. SPTM and VOO show very heavy overlap, with an estimated weighted overlap of 91.39%. They share 502 holdings in the loaded dataset, led by NVDA, AAPL, and MSFT.
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Quick Answer
SPTM is an equity ETF from SPDR, while VOO is a U.S. large-cap core ETF from Vanguard. SPTM and VOO show very heavy overlap, with an estimated weighted overlap of 91.39%. They share 502 holdings in the loaded dataset, led by NVDA, AAPL, and MSFT.
- 91.39% weighted overlap across 502 shared holdings.
- The top three shared holdings explain 19.75% of the measured overlap.
- VOO 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
- VOO 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
SPTM is an equity ETF from SPDR, while VOO is a U.S. large-cap core ETF from Vanguard. SPTM and VOO 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
SPTM is an equity ETF from SPDR, while VOO is a U.S. large-cap core ETF from Vanguard. VOO is the broader fund, while SPTM is the more targeted sleeve. SPTM and VOO 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 19.75% 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, VOO is usually the wider choice. If you want the more focused tilt, SPTM is the narrower expression. SPTM and VOO are priced very similarly on expense ratio.
Overlap Driver Snapshot
Concentration
The top three shared holdings explain 19.75% 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 VOO.
| Holding | Name | SPTM Wt. | VOO Wt. | Overlap |
|---|---|---|---|---|
| NVDA | NVIDIA CORP | 7.13% | 7.84% | 7.13% |
| AAPL | APPLE INC | 6.12% | 6.47% | 6.12% |
| MSFT | MICROSOFT CORP | 4.79% | 5.40% | 4.79% |
| AMZN | AMAZON.COM INC | 3.31% | 3.93% | 3.31% |
| GOOGL | ALPHABET INC CL A | 2.84% | 3.32% | 2.84% |
| AVGO | BROADCOM INC | 2.56% | 2.64% | 2.56% |
| GOOG | ALPHABET INC CL C | 2.27% | 2.66% | 2.27% |
| META | META PLATFORMS INC CLASS A | 2.26% | 2.63% | 2.26% |
| TSLA | TESLA INC | 1.78% | 2.04% | 1.78% |
| BRK-B | BERKSHIRE HATHAWAY INC CL B | 1.44% | 1.49% | 1.44% |
Why These ETFs Overlap
SPTM is an equity ETF from SPDR, 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 NVDA, AAPL, and MSFT, which appear in both portfolios and push the overlap score higher.
Holding both SPTM and VOO 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 VOO
What is the overlap between SPTM and VOO?+
How many holdings do SPTM and VOO share?+
Is the SPTM and VOO overlap high?+
Why do SPTM and VOO overlap?+
Which ETF is broader, SPTM or VOO?+
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.