MDY vs VWO: 0% overlap
SPDR S&P MidCap 400 ETF Trust and Vanguard FTSE Emerging Markets ETF share 0.4% 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
MDY and VWO hold 10 of the same securities. The ten contributing most to the overlap figure:
| Holding | in MDY | in VWO | Δ |
|---|---|---|---|
| MTN | 0.1% | 0.2% | 0.1% |
| VAL | 0.1% | 0.1% | 0.0% |
| SLM | 0.1% | 0.1% | 0.1% |
| PPC | 0.0% | 0.1% | 0.0% |
| MOH | 0.3% | 0.0% | 0.3% |
| TRU | 0.4% | 0.0% | 0.4% |
| M | 0.2% | 0.0% | 0.2% |
| SCI | 0.3% | 0.0% | 0.3% |
| RBA | 0.6% | 0.0% | 0.6% |
| ACI | 0.1% | 0.0% | 0.1% |
Where MDY and VWO 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 | MDY | VWO | Δ |
|---|---|---|---|
| Industrials | 25.4% | 5.9% | +19.5pp |
| Information Technology | 13.8% | 31.6% | −17.7pp |
| Unclassified | 0.0% | 9.3% | −9.3pp |
| Health Care | 9.7% | 2.8% | +6.8pp |
| Real Estate | 6.9% | 1.6% | +5.3pp |
| Cash and/or Derivatives | 0.0% | 4.2% | −4.2pp |
| Communication Services | 1.5% | 5.4% | −3.9pp |
| Financials | 14.8% | 17.2% | −2.4pp |
Δ is MDY minus VWO, 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
96.6% of MDY by weight, held in no part of VWO.
99.5% of VWO by weight, held in no part of MDY.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| MDY | VWO | |
|---|---|---|
| Top 10 holdings | 7.6% | 30.3% |
| Positions held | 400 | 5,003 |
| Cost per $10,000 held, per year | $23 | $6 |
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 MDY and VWO overlap?
MDY and VWO overlap 0.4% by portfolio weight — largely distinct portfolios. They share 10 holdings. The figure comes from current issuer holdings files (MDY as of 2026-07-23, VWO as of 2026-06-30).
How is the overlap between MDY and VWO calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If MDY holds a stock at 6% and VWO 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 MDY and VWO?
That depends on your goals — we state facts, not advice. At 0.4% overlap, each fund still contributes meaningfully distinct exposure.
What does MDY own that VWO doesn't?
MDY holds 400 positions and VWO holds 5,003; 389 of MDY's positions don't appear in VWO at all, and they are 96.6% of MDY by weight.
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Related comparisons
Sources: issuer holdings files, MDY as of 2026-07-23, VWO as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.