ETF comparison
IVOO vs VB
US Mid Cap vs US Small Cap.
Vanguard S&P Mid-Cap 400 Index Fund ETF Shares · Vanguard Morningstar Small-Cap ETF
Holdings overlap
396 positions appear in both funds. Buying equal dollars of IVOO and VB would leave roughly 43.0% 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 4 bps cheaper than IVOO. On a $100,000 position that's about $40/yr more in fees for IVOO.
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 IVOO vs VB.
Top shared holdings
396 shared in total| # | Holding | In IVOO | In VB | Overlap |
|---|---|---|---|---|
| 1 | Twilio Inc | 0.82% | 0.38% | 0.38% |
| 2 | MKS Instruments Inc | 0.62% | 0.37% | 0.37% |
| 3 | Flex Ltd | 1.58% | 0.36% | 0.36% |
| 4 | Carpenter Technology Corp | 0.67% | 0.35% | 0.35% |
| 5 | Curtiss-Wright Corp | 0.79% | 0.34% | 0.34% |
| 6 | Entegris Inc | 0.60% | 0.33% | 0.33% |
| 7 | nVent Electric PLC | 0.77% | 0.33% | 0.33% |
| 8 | ATI Inc | 0.68% | 0.33% | 0.33% |
| 9 | TechnipFMC PLC | 0.79% | 0.32% | 0.32% |
| 10 | MasTec Inc | 0.66% | 0.32% | 0.32% |
| 11 | MACOM Technology Solutions Holdings Inc | 0.67% | 0.32% | 0.32% |
| 12 | Woodward Inc | 0.59% | 0.31% | 0.31% |
Only in IVOO
4 total- Autoliv Inc 0.25%
- SharkNinja Inc 0.25%
- Masimo Corp 0.23%
- LivaNova PLC 0.11%
Only in VB
913 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%
- Tapestry Inc 0.36%
- Casey's General Stores Inc 0.36%
- Atmos Energy Corp 0.35%
Related comparisons
More comparisons with IVOO
- IVOO vs AVMV · Avantis U.S. Mid Cap Value ETF 26.3%
- IVOO vs IWS · iShares Russell Mid-Cap Value ETF 24.2%
- IVOO vs IWR · iShares Russell Mid-Cap ETF 22.8%
- IVOO vs IWP · iShares Russell Mid-Cap Growth ETF 18.1%
- IVOO vs IWM · iShares Russell 2000 ETF 11.1%
- IVOO vs IWD · iShares Russell 1000 Value ETF 6.9%
More comparisons with VB
- 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%
- VB vs DFAT · U.S. Targeted Value Portfolio-ETF Class Shares 29.9%
- VB vs IJK · iShares S&P Mid-Cap 400 Growth ETF 29.4%
- VB vs IJJ · iShares S&P Mid-Cap 400 Value ETF 28.5%
Percentages are holdings overlap with the named fund.
Open IVOO 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.