ETF Overlap Checker
Compare holdings between two ETFs to identify overlap and avoid redundant exposure. Build a diversified portfolio.
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Check ETF Holdings Overlap
Analyze the overlap between two ETFs to avoid over-concentration and build a more diversified portfolio. High overlap means you're essentially buying the same stocks twice.
Select ETFs to Compare
27.4%
Weighted Holdings Overlap
Low overlap - Excellent diversification. These ETFs provide complementary exposure with minimal redundancy.
Common Holdings
10
100% of top holdings match
Diversification Score
73
Out of 100 (higher is better)
New Exposure
72.6%
ETF 2 adds this much new exposure
Price Correlation Analysis
Very High Correlation
These ETFs move together almost perfectly. Limited diversification benefit.
Sector Concentration Analysis
Combined sector exposure assuming 50/50 allocation between these ETFs
| Sector | VOO | VTI | Combined | Status |
|---|---|---|---|---|
| Technology | 16.2% | 15.0% | 15.6% | OK |
| Communication | 5.7% | 5.4% | 5.6% | OK |
| Consumer Cyclical | 4.6% | 4.3% | 4.4% | OK |
| Financial | 1.6% | 1.5% | 1.6% | OK |
| Healthcare | 1.3% | 1.2% | 1.3% | OK |
Common Holdings (Top 10)
| Company | Ticker | VOO Weight | VTI Weight | Overlap |
|---|---|---|---|---|
| Apple Inc. | AAPL | 7.2% | 6.5% | 6.5% |
| Microsoft Corp. | MSFT | 6.1% | 5.8% | 5.8% |
| Amazon.com Inc. | AMZN | 3.1% | 2.9% | 2.9% |
| NVIDIA Corp. | NVDA | 2.9% | 2.7% | 2.7% |
| Alphabet Inc. Class A | GOOGL | 2.0% | 1.9% | 1.9% |
| Meta Platforms Inc. | META | 1.9% | 1.8% | 1.8% |
| Alphabet Inc. Class C | GOOG | 1.8% | 1.7% | 1.7% |
| Berkshire Hathaway Inc. | BRK.B | 1.6% | 1.5% | 1.5% |
| Tesla Inc. | TSLA | 1.5% | 1.4% | 1.4% |
| UnitedHealth Group Inc. | UNH | 1.3% | 1.2% | 1.2% |
| Total Weighted Overlap | 27.4% | |||
Understanding ETF Overlap
What is ETF Overlap?
ETF overlap occurs when two funds hold the same stocks. High overlap reduces diversification and increases concentration risk. If those common stocks decline, both ETFs will be affected similarly.
Why Does Overlap Matter?
Holding VOO (S&P 500) and VTI (Total Market) together provides little additional diversification since VOO's holdings make up ~85% of VTI. You're essentially paying fees twice for the same exposure.
Overlap Guidelines
- <30% overlap: Good diversification - complementary holdings
- 30-70% overlap: Moderate redundancy - some benefit but overlap exists
- >70% overlap: High redundancy - choose one or diversify differently
Building a Diversified Portfolio
Good combinations include:
- VTI (US Total Market) + VXUS (International) = ~0% overlap
- VOO (S&P 500) + QQQ (Nasdaq-100) = ~65% overlap (moderate)
- VTI (Broad Market) + VGT (Tech sector) = ~45% overlap (moderate)
💡 Pro Tip
For a simple, well-diversified portfolio, consider just two ETFs: VTI (US stocks) and VXUS (International stocks). This gives you exposure to thousands of companies worldwide with zero overlap.
⚠️ Important Data Limitations
This tool uses TOP-10 HOLDINGS ONLY: The overlap calculation is based on each ETF's top 10 holdings by weight. Complete ETFs may have 500+ holdings (SPY, VOO) or 3,000+ holdings (VTI).
Why this matters: The top 10 holdings typically represent only 20-30% of total ETF assets. The remaining 70-80% of holdings are not analyzed, which may significantly underestimate or overestimate true overlap.
Data freshness: Holdings data reflects snapshots from 2024-2025 and may not reflect current fund compositions. ETF holdings change quarterly. Always verify with official fund documentation.
For professional portfolio analysis with complete holdings data, consult a financial advisor or use institutional-grade tools.
Key Financial Terms
Understand the essential concepts behind this calculator
Frequently Asked Questions
Common questions about the ETF Overlap Checker
📊 Historical Market Data Sources
• Average annual return (1926-2024): ~10% nominal, ~7% inflation-adjusted
• Standard deviation: ~20% (indicating significant year-to-year volatility)
→ Source: NYU Stern - Historical Returns on Stocks, Bonds and Bills
• S&P 500 average dividend yield: 1.5-2.0% (as of 2024-2025)
• Historical dividend growth rate: ~5.9% annually (1960-2024)
→ Source: S&P Dow Jones Indices
• 10-Year Treasury bonds: ~5% average annual return (1926-2024)
• Corporate bonds (investment grade): ~6% average annual return
→ Source: NYU Stern - Corporate Finance Data
• Long-term average: ~3% annually (1926-2024)
• Recent (2020-2024): 2-8% range with 2022 peak at 8%
→ Source: Bureau of Labor Statistics - Consumer Price Index
Important: Past performance does not guarantee future results. Market returns vary significantly year-to-year. These are long-term historical averages.
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⚠️ Important Disclaimer
This ETF Overlap Checker provides estimates for educational and informational purposes only. Actual results may vary significantly based on individual circumstances, market conditions, regulatory changes, and other factors beyond the scope of this calculator.
The calculations and projections provided are based on assumptions and historical data that may not reflect future performance.Past performance does not guarantee future results.
This tool is not financial advice, tax advice, legal advice, or investment advice. For personalized guidance tailored to your specific situation, please consult with qualified professionals including:
- Certified Financial Planner (CFP)
- Certified Public Accountant (CPA) for tax matters
- Licensed attorney for legal matters
- Registered Investment Advisor (RIA) for investment decisions
Data Accuracy: All data sources, statistics, and rates were verified as accurate as of October 2025. Tax rates, market conditions, and other financial data change over time. Always verify current rates and consult official sources.
No Warranties: While we strive for accuracy, we make no warranties or guarantees regarding the accuracy, completeness, or reliability of any information provided. Use this tool at your own risk.