MDY vs VBK: Holdings Overlap
MDYState Street® SPDR® S&P MIDCAP 400® ETF Trust
State Street (SPDR) · 399 holdings · $27.1B · as of 2026-08-06
VBKVanguard Small-cap Growth Index Fund
Vanguard · 551 holdings · $24.3B · as of 2026-03-31
Holdings snapshots are 128 days apart (MDY: 2026-08-06, VBK: 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 VBK?
State Street® SPDR® S&P MIDCAP 400® ETF Trust (MDY, by State Street (SPDR)) holds 399 positions; Vanguard Small-cap Growth Index Fund (VBK, by Vanguard) holds 551. They have 160 holdings in common, and by portfolio weight the two funds are 39.7% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 39.7%Sum of the smaller weight of each shared holding
- Shared Holdings
- 160MDY holds 399 · VBK holds 551
- Weight in Shared Holdings
- MDY 48%·VBK 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
239 of 399 positions (57.5% of the fund) are not held by VBK. Showing the top 30 by weight.
Only in VBK
391 of 551 positions (55.6% of the fund) are not held by MDY. Showing the top 30 by weight.
Sector Breakdown
| Sector | MDY | VBK |
|---|---|---|
| Industrials | 25.9% | 24.6% |
| Information Technology | 15.6% | 21.6% |
| Health Care | 10.3% | 16.1% |
| Financials | 16.0% | 6.1% |
| Consumer Discretionary | 11.6% | 9.9% |
| Other Sectors | 25.7% | 20.6% |
| Unclassified | 0.0% | 0.9% |
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 VBK).
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% |
| VBK | +1.8% | +19.6% | +29.4% | +16.6% | +5.3% | +11.4% | 0.42% |
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 VBK →
Shared Holdings(160)
The top 10 shared positions account for 16% of the overlap, led by FTI, CW and ATI.
 FTITechnipFMC PLC USD1 | 0.76% | 0.92% | 0.76% |
|---|---|---|---|
 CWCurtiss-Wright Corporation | 0.72% | 0.84% | 0.72% |
 ATIATI Inc COM | 0.83% | 0.66% | 0.66% |
 NVTNVent Electric PLC COM USD0.01 | 0.72% | 0.64% | 0.64% |
 TWLOTwilio, Inc., Class A | 0.80% | 0.64% | 0.64% |
 CRSCarpenter Technology Corporation COM | 0.76% | 0.62% | 0.62% |
 PEverpure, Inc., Class A | 0.75% | 0.62% | 0.62% |
 WWDWoodward Inc. COM | 0.60% | 0.71% | 0.60% |
 ENTGEntegris Inc COM | 0.59% | 0.59% | 0.59% |
 FNFabrinet COM USD0.01 | 0.53% | 0.62% | 0.53% |
 MTSIMACOM Technology Solutions Holdings Inc. COM | 0.54% | 0.50% | 0.50% |
 RBCRBC Bearings Incorporated | 0.49% | 0.57% | 0.49% |
 RGLDRoyal Gold, Inc. COM | 0.49% | 0.72% | 0.49% |
 RBARB Global Inc COM | 0.47% | 0.59% | 0.47% |
 OKTAOkta Inc. Class A | 0.66% | 0.44% | 0.44% |
 TOSTToast, Inc., Class A | 0.45% | 0.44% | 0.44% |
 NBIXNeurocrine Biosciences Inc COM | 0.44% | 0.44% | 0.44% |
 MTZMastec, Inc. COM | 0.44% | 0.68% | 0.44% |
 ROIVRoivant Sciences Ltd SHS | 0.43% | 0.43% | 0.43% |
 WSOWatsco Inc COM | 0.63% | 0.42% | 0.42% |
 LSCCLattice Semiconductor Corporation COM | 0.48% | 0.42% | 0.42% |
 FIVEFive Below Inc COM | 0.68% | 0.42% | 0.42% |
 TLNTalen Energy Corporation COM | 0.42% | 0.49% | 0.42% |
 CLHClean Harbors, Inc. COM | 0.42% | 0.46% | 0.42% |
 LECOLincoln Electric Holdings Inc. COM | 0.42% | 0.46% | 0.42% |
Frequently Asked Questions
How much do MDY and VBK overlap?
MDY and VBK overlap by 39.7% of portfolio weight. They share 160 holdings (MDY holds 399 positions and VBK holds 551), based on each fund's latest SEC-reported holdings.
Is it redundant to own both MDY and VBK?
The two portfolios are 39.7% 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 VBK?
The largest positions held by both funds are FTI, CW, ATI, NVT and TWLO. Together the top 10 shared positions account for 16% of the total overlap.
What does MDY own that VBK doesn't?
239 positions (57.5% of MDY) are unique to MDY, led by ILMN, AA and BJ. In the other direction, 391 positions (55.6% of VBK) are unique to VBK.