IJH vs VB: how much do they really overlap?
IJH (iShares Core S&P Mid-Cap ETF, tracking the S&P MidCap 400) and VB (Vanguard Small-Cap ETF, tracking the CRSP US Small Cap) overlap by roughly 45% by weight. 10 of IJH's top 10 holdings also appear in VB. A 50/50 blend of the two behaves like about 1372 equally-weighted bets (diversification grade A). In short, the two funds share a meaningful core of the same megacaps, but each also brings real exposure the other lacks.
The same companies, in both funds
These 24 holdings appear in both IJH and VB. The weight columns show how much of each fund each name represents.
| Holding | in IJH | in VB |
|---|---|---|
| TWLO TWILIO INC CLASS A | 0.81% | 0.37% |
| MKSI MKS | 0.56% | 0.36% |
| CRS CARPENTER TECHNOLOGY CORP | 0.70% | 0.35% |
| CW CURTISS WRIGHT CORP | 0.74% | 0.33% |
| NVT NVENT ELECTRIC PLC | 0.66% | 0.33% |
| ENTG ENTEGRIS INC | 0.50% | 0.33% |
| FTI TECHNIPFMC PLC | 0.77% | 0.32% |
| ATI ATI INC | 0.70% | 0.32% |
| MTZ MASTEC INC | 0.56% | 0.31% |
| MTSI MACOM TECHNOLOGY SOLUTIONS INC | 0.46% | 0.31% |
| ILMN ILLUMINA INC | 0.87% | 0.30% |
| P EVERPURE INC CLASS A | 0.66% | 0.30% |
| WWD WOODWARD INC | 0.59% | 0.30% |
| STRL STERLING INFRASTRUCTURE INC | 0.50% | 0.29% |
| OKTA OKTA INC CLASS A | 0.66% | 0.27% |
+ 9 more shared holdings.
Only in IJH
iShares Core S&P Mid-Cap ETF — US mid-cap. Its biggest holdings that VB doesn’t have:
| BURL BURLINGTON STORES INC | 0.66% |
| THC TENET HEALTHCARE CORP | 0.61% |
| ROKU ROKU INC CLASS A | 0.53% |
| NBIX NEUROCRINE BIOSCIENCES INC | 0.52% |
| PFGC PERFORMANCE FOOD GROUP | 0.51% |
| EWBC EAST WEST BANCORP INC | 0.50% |
| ITT ITT INC | 0.48% |
| OVV OVINTIV INC | 0.48% |
Only in VB
Vanguard Small-Cap ETF — US small-cap. Its biggest holdings that IJH doesn’t have:
| CRDO Credo Technology Group Holding Ltd. | 0.54% |
| JBL Jabil Inc. | 0.49% |
| RVMD Revolution Medicines Inc. | 0.45% |
| ALAB Astera Labs Inc. | 0.45% |
| NTRA Natera Inc. | 0.44% |
| EME EMCOR Group Inc. | 0.44% |
| NRG NRG Energy Inc. | 0.37% |
| FLEX Flex Ltd. | 0.35% |
So — partly overlapping. Should you hold both?
IJH and VB share a meaningful core of the same megacaps, but each also brings real exposure the other lacks. Held together they keep a shared megacap core but each still pulls in exposure the other lacks, so a 50/50 blend spreads to ~1372 effective positions (grade A).
Holdings as of — IJH: Jul 30, 2026 (iShares (BlackRock)); VB: Jun 30, 2026 (Vanguard). Refreshed monthly. Overlap is measured across each fund’s largest holdings (top 50); the diffuse long tail barely moves the math.
See this for YOUR whole portfolio, free →IJH vs VB — FAQ
- How much do IJH and VB overlap?
- IJH and VB overlap by approximately 45% measured by portfolio weight — that is the share of the smaller fund's holdings (by weight) that also sit inside the other. 10 of IJH's 10 largest holdings are also held by VB. They share 24 of their listed top holdings in total.
- Is it redundant to hold both IJH and VB?
- Because they share a meaningful core of the same megacaps, but each also brings real exposure the other lacks, holding both is partly redundant: you double up on a shared core (TWLO) while each fund still adds distinct exposure. A 50/50 blend has an effective 1372 positions and a A diversification grade.
- What does VB hold that IJH doesn't?
- VB's largest holdings that IJH doesn't hold include CRDO, JBL, RVMD, ALAB, NTRA. Its category is US small-cap, versus IJH's US mid-cap.
- Which is more concentrated, IJH or VB?
- IJH's top 10 holdings are 27% of its listed weight; VB's are 27%. The more concentrated fund leans harder on its largest names.