MDY vs VB: Holdings Overlap
MDYState Street® SPDR® S&P MIDCAP 400® ETF Trust
State Street (SPDR) · 399 holdings · $27.1B · as of 2026-08-06
VBVanguard Small-cap Index Fund
Vanguard · 1312 holdings · $82.5B · as of 2026-03-31
Holdings snapshots are 128 days apart (MDY: 2026-08-06, VB: 2026-03-31). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are MDY and VB?
State Street® SPDR® S&P MIDCAP 400® ETF Trust (MDY, by State Street (SPDR)) holds 399 positions; Vanguard Small-cap Index Fund (VB, by Vanguard) holds 1312. They have 396 holdings in common, and by portfolio weight the two funds are 44.0% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 44.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 396MDY holds 399 · VB holds 1312
- Weight in Shared Holdings
- MDY 104%·VB 44%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in MDY
3 of 399 positions (1.0% of the fund) are not held by VB.
Sector Breakdown
| Sector | MDY | VB |
|---|---|---|
| Industrials | 25.9% | 21.2% |
| Financials | 16.0% | 13.4% |
| Information Technology | 15.6% | 13.8% |
| Health Care | 10.3% | 11.6% |
| Consumer Discretionary | 11.6% | 10.5% |
| Other Sectors | 25.7% | 28.5% |
| Unclassified | 0.0% | 0.7% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts. “Unclassified” is weight we could not classify (0% of MDY, 1% of VB).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| MDY | +3.1% | +18.1% | +25.6% | +14.2% | +8.8% | +10.9% | 0.99% |
| VB | +2.5% | +19.5% | +29.1% | +15.9% | +8.1% | +11.3% | 1.18% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in MDY vs VB →
Shared Holdings(396)
The top 10 shared positions account for 7% of the overlap, led by FTI, UTHR and CW.
 FTITechnipFMC PLC USD1 | 0.76% | 0.39% | 0.39% |
|---|---|---|---|
 UTHRUnited Therapeutics Corporation COM | 0.62% | 0.36% | 0.36% |
 CWCurtiss-Wright Corporation | 0.72% | 0.35% | 0.35% |
 XPOXPO Inc COM | 0.63% | 0.30% | 0.30% |
 RGLDRoyal Gold, Inc. COM | 0.49% | 0.30% | 0.30% |
 WWDWoodward Inc. COM | 0.60% | 0.30% | 0.30% |
 USFDUS Foods Holding Corp COM | 0.64% | 0.28% | 0.28% |
 MTZMastec, Inc. COM | 0.44% | 0.28% | 0.28% |
 ATIATI Inc COM | 0.83% | 0.28% | 0.28% |
 NVTNVent Electric PLC COM USD0.01 | 0.72% | 0.27% | 0.27% |
 TWLOTwilio, Inc., Class A | 0.80% | 0.27% | 0.27% |
 BWXTBWX Technologies Inc. COM | 0.42% | 0.26% | 0.26% |
 FNFabrinet COM USD0.01 | 0.53% | 0.26% | 0.26% |
 CRSCarpenter Technology Corporation COM | 0.76% | 0.26% | 0.26% |
 PEverpure, Inc., Class A | 0.75% | 0.26% | 0.26% |
 ILMNIllumina Inc COM | 0.80% | 0.25% | 0.25% |
 RBARB Global Inc COM | 0.47% | 0.25% | 0.25% |
 ENTGEntegris Inc COM | 0.59% | 0.25% | 0.25% |
 AAAlcoa Corporation COM | 0.68% | 0.25% | 0.25% |
 RBCRBC Bearings Incorporated | 0.49% | 0.24% | 0.24% |
 NXTNextpower Inc. CLASS A COM | 0.40% | 0.24% | 0.24% |
 OVVOvintiv Inc COM | 0.45% | 0.24% | 0.24% |
 PRPermian Resources Corporation Class A | 0.44% | 0.23% | 0.23% |
 THCTenet Healthcare Corporation COM NEW | 0.60% | 0.23% | 0.23% |
 ITTITT Inc COM | 0.52% | 0.23% | 0.23% |
Showing the top 250 of 396 shared holdings by overlap weight.
Frequently Asked Questions
How much do MDY and VB overlap?
MDY and VB overlap by 44.0% of portfolio weight. They share 396 holdings (MDY holds 399 positions and VB holds 1312), based on each fund's latest SEC-reported holdings.
Is it redundant to own both MDY and VB?
The two portfolios are 44.0% identical by weight. Owning both is defensible: they share a meaningful core, but each fund adds exposure the other lacks.
What are the biggest shared holdings of MDY and VB?
The largest positions held by both funds are FTI, UTHR, CW, XPO and RGLD. Together the top 10 shared positions account for 7% of the total overlap.
What does MDY own that VB doesn't?
3 positions (1.0% of MDY) are unique to MDY, led by SN, ALV and LIVN. In the other direction, 916 positions (55.7% of VB) are unique to VB.