MDY vs SCHB: 5% overlap
SPDR S&P MidCap 400 ETF Trust and Schwab U.S. Broad Market ETF share 4.6% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 2 months apart — SCHB as of 2026-05-31, the rest through 2026-07-23. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
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 SCHB hold 382 of the same securities. The ten contributing most to the overlap figure:
| Holding | in MDY | in SCHB | Δ |
|---|---|---|---|
| TWLO | 0.8% | 0.0% | 0.7% |
| CW | 0.8% | 0.0% | 0.7% |
| STRL | 0.6% | 0.0% | 0.6% |
| XPO | 0.7% | 0.0% | 0.7% |
| P | 0.7% | 0.0% | 0.6% |
| ILMN | 0.8% | 0.0% | 0.8% |
| ATI | 0.8% | 0.0% | 0.7% |
| UTHR | 0.6% | 0.0% | 0.6% |
| MTSI | 0.5% | 0.0% | 0.5% |
| CRS | 0.8% | 0.0% | 0.8% |
Where MDY and SCHB 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 | SCHB | Δ |
|---|---|---|---|
| Information Technology | 13.8% | 35.8% | −22.0pp |
| Industrials | 25.4% | 8.8% | +16.6pp |
| Communication Services | 1.5% | 9.6% | −8.1pp |
| Real Estate | 6.9% | 2.2% | +4.7pp |
| Materials | 5.4% | 1.6% | +3.9pp |
| Financials | 14.8% | 11.1% | +3.7pp |
| Unclassified | 0.0% | 3.5% | −3.5pp |
| Energy | 4.9% | 3.2% | +1.7pp |
Δ is MDY minus SCHB, 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
5.2% of MDY by weight, held in no part of SCHB.
95.5% of SCHB 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 | SCHB | |
|---|---|---|
| Top 10 holdings | 7.6% | 34.9% |
| Positions held | 400 | 2,407 |
| Cost per $10,000 held, per year | $23 | $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 MDY and SCHB overlap?
MDY and SCHB overlap 4.6% by portfolio weight — largely distinct portfolios. They share 382 holdings. The figure comes from current issuer holdings files (MDY as of 2026-07-23, SCHB as of 2026-05-31).
How is the overlap between MDY and SCHB 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 SCHB 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 SCHB?
That depends on your goals — we state facts, not advice. At 4.6% overlap, each fund still contributes meaningfully distinct exposure.
What does MDY own that SCHB doesn't?
MDY holds 400 positions and SCHB holds 2,407; 17 of MDY's positions don't appear in SCHB at all, and they are 5.2% of MDY by weight.
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Related comparisons
Sources: issuer holdings files, MDY as of 2026-07-23, SCHB as of 2026-05-31. Weights are fractions of each fund. Diagnostics, not advice.