Instantly analyze ETF holdings, detect hidden overlap, and optimize your portfolio diversification strategy — powered by real-time holdings data.
Everything you need to understand ETF overlap and concentration risk
Compare two ETFs side-by-side and instantly see which stocks appear in multiple funds and their combined weights.
See exactly how much of your portfolio is allocated to each overlapping stock, weighted by your actual ETF holdings.
Analyze overlap across your entire portfolio — not just pairs. See how three, four, or more ETFs interact together.
ETF overlap occurs when two or more exchange-traded funds hold many of the same underlying stocks. While ETFs are designed to provide diversification, combining funds without analyzing their holdings can unintentionally increase concentration risk — meaning you may have far more exposure to certain companies than you realize.
For instance, both VOO (Vanguard S&P 500) and QQQ (Invesco Nasdaq-100) hold significant positions in Apple, Microsoft, Amazon, and Nvidia. An investor holding both funds might believe they have broad diversification, but in reality, a large portion of their portfolio is concentrated in the same mega-cap technology stocks.
High overlap between ETFs reduces the true diversification benefits you're paying for. Each ETF charges an expense ratio, and if two ETFs hold largely the same stocks, you're effectively paying twice for the same exposure. Beyond cost, excessive overlap amplifies sector-specific and stock-specific risk — when those concentrated positions decline, a larger portion of your portfolio is affected.
This is especially relevant for dividend-focused investors who may hold multiple high-yield ETFs like SCHD, VYM, and DGRO, which can share significant overlap in dividend-paying large-cap stocks. Understanding these overlaps helps you make intentional allocation decisions rather than duplicating exposure accidentally.
ETFs target meaningfully different segments of the market
Some shared holdings — review whether overlap is intentional
Consider consolidating into fewer funds to reduce fees
When comparing VOO and QQQ, investors often discover significant overlap in mega-cap technology holdings such as Apple, Microsoft, and Nvidia. While QQQ is Nasdaq-focused and more tech-heavy, both ETFs allocate meaningful weight to the same large-cap companies.
This results in moderate to high overlap depending on weighting. Investors seeking broader diversification may consider pairing VOO with small-cap or international ETFs instead.
Our ETF overlap calculator uses real holdings data updated regularly to give you accurate, actionable insights into your portfolio's true diversification.
Type in two or more ETF ticker symbols to begin your overlap analysis.
We analyze the full holdings data for each ETF and identify every shared position.
See the overlap percentage, shared holdings list, sector breakdown, and concentration alerts.
Use the insights to reduce redundancy, lower fees, and improve your true diversification.
These popular ETF pairs are frequently analyzed for overlap. Knowing which funds share significant holdings can help you build a more efficient portfolio.
| ETF Pair | Overlap Level | Key Insight |
|---|---|---|
| VOO vs VTI Overlap | Very High | VTI includes all of VOO's holdings plus small/mid-caps |
| SPY vs VOO Overlap | ~100% | Both track the S&P 500 — nearly identical holdings |
| VOO vs QQQ Overlap | High | Significant duplication in mega-cap tech holdings like Apple, Microsoft, and Nvidia |
| SCHD vs VYM Overlap | Low | Different dividend methodologies with relatively limited shared holdings |
| QQQ vs SMH Overlap | Moderate | Overlap driven primarily by shared semiconductor giants like Nvidia and Broadcom, though SMH remains more concentrated in the chip sector. |
| SCHD vs JEPQ Overlap | Low | Different income strategies — dividends vs covered calls on Nasdaq |
If your analysis reveals high overlap, consider these strategies to improve portfolio efficiency. Start by identifying which ETFs provide unique exposure versus which are largely redundant. Consolidating into fewer, more targeted funds can lower your total expense ratio while maintaining — or even improving — diversification.
Diversify across asset classes (bonds, international, real estate), market capitalizations (small-cap, mid-cap), and investment styles (growth vs. value). Using a core-satellite approach — with a broad market ETF as the core and specialized ETFs as satellites — can help maintain diversification while allowing you to express specific investment convictions.
While many ETF comparison tools show performance and expense ratios, our ETF Overlap Calculator focuses specifically on holdings duplication and weighted concentration risk. This allows investors to identify hidden redundancy across multiple funds and improve portfolio diversification.
If you're building a diversified ETF portfolio, combining both performance comparison and overlap analysis gives you a more complete view of risk and exposure.
Common questions about ETF overlap and portfolio diversification
ETF overlap occurs when multiple ETFs hold many of the same underlying stocks. This reduces diversification because your actual exposure is more concentrated than it appears. For example, owning both VOO and QQQ means heavy duplication in mega-cap tech names like Apple, Microsoft, and Amazon.
High ETF overlap can reduce diversification and increase concentration risk. Some overlap is normal and expected, but excessive overlap means you're paying multiple expense ratios for largely the same exposure. The key is whether the overlap is intentional and aligned with your investment thesis.
Generally, 0–20% overlap indicates strong diversification, 20–40% is moderate, and above 40% signals high concentration risk. However, context matters — intentionally overweighting a sector you're bullish on is different from accidental overlap.
ETF overlap is calculated by comparing the underlying holdings of two or more ETFs. For each stock that appears in multiple funds, the overlap contribution is the minimum weight across the funds. The total overlap percentage is the sum of these minimum weights for all shared holdings.
To reduce overlap, first identify which ETFs are redundant using an overlap analysis tool. Then consider consolidating into fewer funds, diversifying across asset classes and market caps, and using a core-satellite portfolio approach with a broad market ETF as your base.
ETF Navigator Pro provides advanced portfolio analytics tools for individual investors and advisors. Our platform specializes in ETF overlap analysis, diversification modeling, and portfolio optimization strategies based on real holdings data.
Last updated: February 2026
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