SOXX vs VB: how much do they really overlap?
SOXX (iShares Semiconductor ETF, tracking the NYSE Semiconductor) and VB (Vanguard Small-Cap ETF, tracking the CRSP US Small Cap) overlap by roughly 10% by weight. 0 of SOXX's top 10 holdings also appear in VB. A 50/50 blend of the two behaves like about 80 equally-weighted bets (diversification grade A). In short, the two funds have only a small shared core — they mostly hold different things and are largely complementary.
The same companies, in both funds
These 4 holdings appear in both SOXX and VB. The weight columns show how much of each fund each name represents.
| Holding | in SOXX | in VB |
|---|---|---|
| ALAB ASTERA LABS INC | 3.02% | 0.62% |
| CRDO CREDO TECHNOLOGY GROUP HOLDING LTD | 2.01% | 0.48% |
| MTSI MACOM TECHNOLOGY SOLUTIONS INC | 1.17% | 0.31% |
| ENTG ENTEGRIS INC | 1.22% | 0.26% |
Only in SOXX
iShares Semiconductor ETF — semiconductors. Its biggest holdings that VB doesn’t have:
| MU MICRON TECHNOLOGY INC | 8.54% |
| AMD ADVANCED MICRO DEVICES INC | 8.09% |
| NVDA NVIDIA CORP | 6.81% |
| INTC INTEL CORPORATION | 6.33% |
| AVGO BROADCOM INC | 6.08% |
| AMAT APPLIED MATERIAL INC | 5.77% |
| KLAC KLA CORP | 5.64% |
| LRCX LAM RESEARCH CORP | 4.89% |
Only in VB
Vanguard Small-Cap ETF — US small-cap. Its biggest holdings that SOXX doesn’t have:
| FLEX Flex Ltd. | 0.69% |
| CIEN Ciena Corp. | 0.51% |
| RKLB Rocket Lab Corp. | 0.50% |
| BE Bloom Energy Corp. Class A | 0.47% |
| EME EMCOR Group Inc. | 0.46% |
| JBL Jabil Inc. | 0.45% |
| COHR Coherent Corp. | 0.42% |
| FIX Comfort Systems USA Inc. | 0.40% |
So — mostly different. Should you hold both?
SOXX and VB have only a small shared core — they mostly hold different things and are largely complementary. Held together they genuinely broaden your exposure — a 50/50 blend reaches ~80 effective positions (grade A), because they hold largely different securities.
Holdings as of — SOXX: 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 →SOXX vs VB — FAQ
- How much do SOXX and VB overlap?
- SOXX and VB overlap by approximately 10% measured by portfolio weight — that is the share of the smaller fund's holdings (by weight) that also sit inside the other. 0 of SOXX's 10 largest holdings are also held by VB. They share 4 of their listed top holdings in total.
- Is it redundant to hold both SOXX and VB?
- Because they have only a small shared core — they mostly hold different things and are largely complementary, holding both is not redundant — each fund covers largely different holdings, so together they broaden your exposure. A 50/50 blend has an effective 80 positions and a A diversification grade.
- What does VB hold that SOXX doesn't?
- VB's largest holdings that SOXX doesn't hold include FLEX, CIEN, RKLB, BE, EME. Its category is US small-cap, versus SOXX's semiconductors.
- Which is more concentrated, SOXX or VB?
- SOXX's top 10 holdings are 61% of its listed weight; VB's are 29%. The more concentrated fund leans harder on its largest names.