Guardfolio Research · ETF Overlap
FXAIX vs VOO: 93.4% Overlap by Weight
FXAIX (Fidelity 500 Index Fund) and VOO (Vanguard S&P 500 ETF) track the same index and overlap by 93.4% across licensed full holdings. Searching FXAIX vs VOO or VOO vs FXAIX? Holding both adds little diversification. The real choice is mutual fund vs ETF structure, fees, and where you buy.
Overlap Summary
Bottom line
FXAIX and VOO track the same underlying index, so their licensed full-holdings overlap is 93.4%. Holding both adds little diversification.
The Data
Exactly which securities FXAIX and VOO share
The table below shows the largest contributors to overlap across the licensed full holdings, with each fund's normalized weight and the lesser weight that counts toward overlap.
| Data basis | Licensed full holdings |
|---|---|
| Fund dates | FXAIX 2026-08-19; VOO 2026-08-24 |
| Coverage gate | At least 97% retained per fund |
| Holding | FXAIX weight | VOO weight | Shared (min) |
|---|---|---|---|
| NVIDIA Corp (NVDA) | 7.51% | 7.56% | 7.51% |
| Apple Inc (AAPL) | 6.59% | 7.05% | 6.59% |
| Microsoft Corp (MSFT) | 4.30% | 5.37% | 4.30% |
| Amazon.com Inc (AMZN) | 3.62% | 4.13% | 3.62% |
| Alphabet Inc Class A (GOOGL) | 3.25% | 3.25% | 3.25% |
| Broadcom Inc (AVGO) | 2.77% | 2.87% | 2.77% |
| Alphabet Inc Class C (GOOG) | 2.59% | 2.62% | 2.59% |
| Meta Platforms Inc Class A (META) | 1.92% | 1.90% | 1.90% |
| Micron Technology Inc (MU) | 2.02% | 1.44% | 1.44% |
| Berkshire Hathaway Inc Class B (BRK-B) | 1.42% | 1.46% | 1.42% |
| Eli Lilly & Co (LLY) | 1.47% | 1.41% | 1.41% |
| Tesla Inc (TSLA) | 1.84% | 1.36% | 1.36% |
| JPMorgan Chase & Co (JPM) | 1.36% | 1.47% | 1.36% |
| Advanced Micro Devices Inc (AMD) | 1.47% | 1.21% | 1.21% |
| Johnson & Johnson (JNJ) | 0.95% | 0.96% | 0.95% |
| Visa Inc Class A (V) | 0.88% | 0.93% | 0.88% |
| Walmart Inc (WMT) | 0.77% | 0.76% | 0.76% |
| Cisco Systems Inc (CSCO) | 0.72% | 0.71% | 0.71% |
| AbbVie Inc (ABBV) | 0.69% | 0.69% | 0.69% |
| Intel Corp (INTC) | 1.02% | 0.66% | 0.66% |
| Total full-holdings overlap | 98.0% | 98.1% | 93.4% |
Showing the 20 largest contributors of 499 shared securities. The total uses every shared security.
The 93.4% figure uses all reported non-cash holdings and sums the lesser normalized weight for each shared security. FXAIX is dated 2026-08-19 with 99.983% retained coverage; VOO is dated 2026-08-24 with 99.945% retained coverage.
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Sector Picture
FXAIX vs VOO: sector exposure side by side
Two funds can share few holdings yet still concentrate the same sectors. Here is how the top sectors compare (97.0% combined sector overlap).
| Sector | FXAIX | VOO |
|---|---|---|
| Technology | 33.1% | 33.1% |
| Financial Services | 12.2% | 12.2% |
| Consumer Discretionary | 10.4% | 10.4% |
| Healthcare | 9.3% | 9.3% |
| Industrials | 8.6% | 8.6% |
| Communication Services | 8.2% | 8.2% |
The Verdict
Should you hold both FXAIX and VOO?
FXAIX and VOO track the same underlying index, so their licensed full-holdings overlap is 93.4%. Holding both adds little diversification. The main differences are the expense ratio (0.01% vs 0.03%), issuer, structure, and trading liquidity.
FAQ
FXAIX vs VOO overlap: common questions
How much do FXAIX and VOO overlap?
FXAIX (Fidelity 500 Index) and VOO (Vanguard S&P 500) overlap by approximately 93.4% of normalized weight across their licensed full holdings. They share 499 securities; the largest contributors include NVDA, AAPL, MSFT, AMZN, GOOGL, AVGO, GOOG, META. The separately dated sector reference shows 97.0% overlap.
What stocks do FXAIX and VOO both hold?
Both FXAIX and VOO hold NVIDIA Corp (NVDA), Apple Inc (AAPL), Microsoft Corp (MSFT), Amazon (AMZN), Alphabet Inc Class A (GOOGL), Broadcom Inc (AVGO), Alphabet Inc Class C (GOOG), Meta Platforms Inc Class A (META) among their top positions. These shared names account for the 93.4% weight overlap.
Is it worth holding both FXAIX and VOO?
FXAIX and VOO track the same underlying index, so their licensed full-holdings overlap is 93.4%. Holding both adds little diversification. The main differences are the expense ratio (0.01% vs 0.03%), issuer, structure, and trading liquidity.
What is the difference between FXAIX and VOO?
FXAIX is an S&P 500 fund (US Large-Cap Blend, 0.01% expense ratio) and VOO is an S&P 500 fund (US Large-Cap Blend, 0.03% expense ratio). The dataset includes 505 FXAIX holdings as of 2026-08-19 and 506 VOO holdings as of 2026-08-24.
VOO vs FXAIX: which should I choose?
For exposure, VOO vs FXAIX is nearly the same bet: 93.4% full-holdings weight overlap. Choose based on account type and trading needs. FXAIX is a Fidelity mutual fund (0.01% ER) that fits well inside Fidelity accounts. VOO is a Vanguard ETF (0.03% ER) that trades like a stock on any brokerage. Holding both usually adds fees and complexity without meaningful diversification.
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