EFA vs VOO: 1% overlap
iShares MSCI EAFE ETF and Vanguard S&P 500 ETF share 0.8% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
You would hold two tickers and get the diversification of 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
EFA and VOO hold 18 of the same securities. The ten contributing most to the overlap figure:
| Holding | in EFA | in VOO | Δ |
|---|---|---|---|
| ALL | 0.1% | 0.1% | 0.0% |
| MRK | 0.1% | 0.5% | 0.4% |
| PRU | 0.2% | 0.1% | 0.1% |
| HBAN | 0.1% | 0.1% | 0.0% |
| ADM | 0.1% | 0.1% | 0.0% |
| ROP | 1.4% | 0.1% | 1.3% |
| EQT | 0.1% | 0.1% | 0.0% |
| DTE | 0.5% | 0.0% | 0.4% |
| DG | 0.3% | 0.0% | 0.2% |
| TEL | 0.0% | 0.1% | 0.1% |
Where EFA and VOO differ
Sector weights as a share of each fund, ordered by the size of the gap rather than the size of the sector — two funds that overlap heavily still usually diverge somewhere.
| Sector | EFA | VOO | Δ |
|---|---|---|---|
| Information Technology | 12.0% | 38.0% | −26.0pp |
| Financials | 25.8% | 11.6% | +14.2pp |
| Industrials | 19.0% | 8.9% | +10.1pp |
| Communication Services | 3.1% | 9.7% | −6.5pp |
| Materials | 5.8% | 1.8% | +3.9pp |
| Consumer Staples | 7.0% | 4.6% | +2.5pp |
| Utilities | 4.5% | 2.2% | +2.3pp |
| Consumer Discretionary | 8.3% | 9.3% | −1.0pp |
Δ is EFA minus VOO, in percentage points. Sector data is not published by every issuer, so “Unclassified” is a real category rather than a gap in the table.
What each fund holds alone
96.1% of EFA by weight, held in no part of VOO.
98.3% of VOO by weight, held in no part of EFA.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| EFA | VOO | |
|---|---|---|
| Top 10 holdings | 14.5% | 36.4% |
| Positions held | 678 | 505 |
| Cost per $10,000 held, per year | $33 | $3 |
Cost is the expense ratio applied to $10,000; it excludes any brokerage commission, bid-ask spread or tax consequence. Figures are facts about the funds, not a suggestion about which to hold.
Frequently asked
How much do EFA and VOO overlap?
EFA and VOO overlap 0.8% by portfolio weight — largely distinct portfolios. They share 18 holdings. The figure comes from current issuer holdings files (EFA as of 2026-07-23, VOO as of 2026-06-30).
How is the overlap between EFA and VOO calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If EFA holds a stock at 6% and VOO holds the same stock at 4%, 4% counts as shared. The result is bounded between 0% and 100%, and it is computed after looking through any fund-of-funds to the underlying holdings.
Is it redundant to hold both EFA and VOO?
That depends on your goals — we state facts, not advice. At 0.8% overlap, each fund still contributes meaningfully distinct exposure.
What does EFA own that VOO doesn't?
EFA holds 678 positions and VOO holds 505; 659 of EFA's positions don't appear in VOO at all, and they are 96.1% of EFA by weight.
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Related comparisons
Sources: issuer holdings files, EFA as of 2026-07-23, VOO as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.