ETF comparison
MDY vs VB
US Mid Cap vs US Small Cap.
State Street SPDR S&P MIDCAP 400 ETF Trust · Vanguard Morningstar Small-Cap ETF
Holdings overlap
397 positions appear in both funds. Buying equal dollars of MDY and VB would leave roughly 43.6% of each dollar exposed to the same underlying securities.
Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for why.
Cost difference
VB is 20 bps cheaper than MDY. On a $100,000 position that's about $200/yr more in fees for MDY.
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with MDY vs VB.
Top shared holdings
397 shared in total| # | Holding | In MDY | In VB | Overlap |
|---|---|---|---|---|
| 1 | Twilio Inc. Class A | 1.30% | 0.38% | 0.38% |
| 2 | MKS Inc. | 0.54% | 0.37% | 0.37% |
| 3 | Carpenter Technology Corporation | 0.55% | 0.35% | 0.35% |
| 4 | Curtiss-Wright Corporation | 0.58% | 0.34% | 0.34% |
| 5 | Entegris Inc. | 0.73% | 0.33% | 0.33% |
| 6 | nVent Electric plc | 0.79% | 0.33% | 0.33% |
| 7 | ATI Inc | 0.75% | 0.33% | 0.33% |
| 8 | TechnipFMC plc | 0.77% | 0.32% | 0.32% |
| 9 | MasTec Inc. | 0.39% | 0.32% | 0.32% |
| 10 | MACOM Technology Solutions Holdings Inc. | 0.64% | 0.32% | 0.32% |
| 11 | Woodward Inc. | 0.56% | 0.31% | 0.31% |
| 12 | Sterling Infrastructure Inc. | 0.47% | 0.30% | 0.30% |
Only in MDY
4 total- U.S. Dollar 0.89%
- SharkNinja Inc. 0.44%
- Autoliv Inc. 0.21%
- LivaNova Plc 0.12%
Only in VB
912 total- Credo Technology Group Holding Ltd 0.55%
- Jabil Inc 0.49%
- REVOLUTION Medicines Inc 0.46%
- Astera Labs Inc 0.45%
- Natera Inc 0.45%
- EMCOR Group Inc 0.45%
- NRG Energy Inc 0.37%
- Flex Ltd 0.36%
- Tapestry Inc 0.36%
- Casey's General Stores Inc 0.36%
Related comparisons
More comparisons with MDY
More comparisons with VB
- VB vs IJH · iShares Core S&P Mid-Cap ETF 43.5%
- VB vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 43.5%
- VB vs IVOO · Vanguard S&P Mid-Cap 400 Index Fund ETF Shares 43.0%
- VB vs FNDA · Schwab Fundamental U.S. Small Company ETF 36.1%
- VB vs DON · WisdomTree U.S. MidCap Dividend Fund 32.1%
- VB vs VTWO · Vanguard Russell 2000 Index Fund ETF Shares 30.8%
Percentages are holdings overlap with the named fund.
Open MDY or VB at a brokerage
Both funds trade commission-free at major US brokerages.
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.
Holdings overlap is the sum of min(weight_a, weight_b) over positions
matched on ISIN (CUSIP fallback). Methodology: see
/methodology/.
Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.