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 33% by weight. 10 of IJH's top 10 holdings also appear in VB. A 50/50 blend of the two behaves like about 1278 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 19 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 | 0.86% | 0.36% |
| CW CURTISS WRIGHT CORP | 0.77% | 0.34% |
| FTI TECHNIPFMC PLC | 0.72% | 0.34% |
| NVT NVENT ELECTRIC PLC | 0.75% | 0.33% |
| STRL STERLING INFRASTRUCTURE INC | 0.71% | 0.31% |
| MTSI MACOM TECHNOLOGY SOLUTIONS INC | 0.68% | 0.31% |
| P EVERPURE INC CLASS A | 0.68% | 0.31% |
| ATI ATI INC | 0.74% | 0.30% |
| MTZ MASTEC INC | 0.70% | 0.30% |
| XPO XPO INC | 0.66% | 0.30% |
| UTHR UNITED THERAPEUTICS CORP | 0.63% | 0.30% |
| ILMN ILLUMINA INC | 0.73% | 0.29% |
| FN FABRINET | 0.55% | 0.29% |
| CRS CARPENTER TECHNOLOGY CORP | 0.84% | 0.28% |
| MKSI MKS | 0.82% | 0.27% |
+ 4 more shared holdings.
Only in IJH
iShares Core S&P Mid-Cap ETF — US mid-cap. Its biggest holdings that VB doesn’t have:
| USFD US FOODS HOLDING CORP | 0.62% |
| RBA RB GLOBAL INC | 0.59% |
| LSCC LATTICE SEMICONDUCTOR CORP | 0.57% |
| RBC RBC BEARINGS INC | 0.56% |
| SNX TD SYNNEX CORP | 0.55% |
| BURL BURLINGTON STORES INC | 0.55% |
| TTMI TTM TECHNOLOGIES INC | 0.53% |
| RS RELIANCE STEEL & ALUMINUM | 0.52% |
Only in VB
Vanguard Small-Cap ETF — US small-cap. Its biggest holdings that IJH doesn’t have:
| FLEX Flex Ltd. | 0.69% |
| ALAB Astera Labs Inc. | 0.62% |
| CIEN Ciena Corp. | 0.51% |
| RKLB Rocket Lab Corp. | 0.50% |
| CRDO Credo Technology Group Holding Ltd. | 0.48% |
| BE Bloom Energy Corp. Class A | 0.47% |
| EME EMCOR Group Inc. | 0.46% |
| JBL Jabil Inc. | 0.45% |
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 ~1278 effective positions (grade A).
Holdings as of — IJH: Jun 30, 2026 (iShares (BlackRock)); VB: May 31, 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 33% 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 19 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 1278 positions and a A diversification grade.
- What does VB hold that IJH doesn't?
- VB's largest holdings that IJH doesn't hold include FLEX, ALAB, CIEN, RKLB, CRDO. 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 29%. The more concentrated fund leans harder on its largest names.