SOXX vs SPLG Overlap
SOXX is a semiconductor-focused equity ETF from IShares, while SPLG is a U.S. large-cap core ETF from SPDR. SOXX and SPLG show limited overlap, with an estimated weighted overlap of 13.65%. They share 16 holdings in the loaded dataset, led by NVDA, AVGO, and AMD.
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Quick Answer
SOXX is a semiconductor-focused equity ETF from IShares, while SPLG is a U.S. large-cap core ETF from SPDR. SOXX and SPLG show limited overlap, with an estimated weighted overlap of 13.65%. They share 16 holdings in the loaded dataset, led by NVDA, AVGO, and AMD.
- 13.65% weighted overlap across 16 shared holdings.
- The top three shared holdings explain 80.37% of the measured overlap.
- SPLG is the broader fund, while SOXX is more targeted.
- The overlap is mostly explained by the top shared positions rather than sector labels alone.
- Holding both can still add materially different exposure.
Data Freshness
- SOXX holdings
- Mar 12, 2026
- SPLG 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
SOXX is a semiconductor-focused equity ETF from IShares, while SPLG is a U.S. large-cap core ETF from SPDR. SOXX and SPLG do not own much of the same portfolio weight. That usually means you are combining different parts of the market, with only a small amount of duplication through names like NVDA, AVGO, and AMD.
How They Differ
SOXX is a semiconductor-focused equity ETF from IShares, while SPLG is a U.S. large-cap core ETF from SPDR. SPLG is the broader fund, while SOXX is the more targeted sleeve. SPLG has the lower expense ratio, while SOXX 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 80.37% 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, SPLG is usually the wider choice. If you want the more focused tilt, SOXX is the narrower expression. SPLG has the lower expense ratio, while SOXX charges more for its exposure.
Overlap Driver Snapshot
Concentration
The top three shared holdings explain 80.37% 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 SOXX and SPLG.
| Holding | Name | SOXX Wt. | SPLG Wt. | Overlap |
|---|---|---|---|---|
| NVDA | NVIDIA CORP | 7.28% | 8.34% | 7.28% |
| AVGO | BROADCOM INC | 5.92% | 2.98% | 2.98% |
| AMD | ADVANCED MICRO DEVICES INC | 6.51% | 0.71% | 0.71% |
| MU | MICRON TECHNOLOGY INC | 8.75% | 0.42% | 0.42% |
| LRCX | LAM RESEARCH CORP | 4.81% | 0.34% | 0.34% |
| QCOM | QUALCOMM INC | 2.80% | 0.33% | 0.33% |
| AMAT | APPLIED MATERIAL INC | 7.04% | 0.31% | 0.31% |
| INTC | INTEL CORPORATION CORP | 4.02% | 0.31% | 0.31% |
| KLAC | KLA CORP | 4.31% | 0.27% | 0.27% |
| TXN | TEXAS INSTRUMENT INC | 4.09% | 0.26% | 0.26% |
Why These ETFs Overlap
SOXX is a semiconductor-focused equity ETF from IShares, while SPLG is a U.S. large-cap core ETF from SPDR. The overlap exists because both funds allocate meaningful weight to the same holdings. In this dataset, the biggest shared drivers are NVDA, AVGO, and AMD, which appear in both portfolios and push the overlap score higher.
Holding both SOXX and SPLG can make sense if you want exposure to different sleeves of the market. The overlap is small enough that both funds may still improve diversification.
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Frequently Asked Questions About SOXX and SPLG
What is the overlap between SOXX and SPLG?+
How many holdings do SOXX and SPLG share?+
Is the SOXX and SPLG overlap high?+
Why do SOXX and SPLG overlap?+
Which ETF is broader, SOXX or SPLG?+
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.