SOXX vs VXF: how much do they really overlap?
SOXX (iShares Semiconductor ETF, tracking the NYSE Semiconductor) and VXF (Vanguard Extended Market ETF, tracking the S&P Completion) overlap by roughly 18% by weight. 1 of SOXX's top 10 holdings also appear in VXF. A 50/50 blend of the two behaves like about 76 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 5 holdings appear in both SOXX and VXF. The weight columns show how much of each fund each name represents.
| Holding | in SOXX | in VXF |
|---|---|---|
| MRVL MARVELL TECHNOLOGY INC | 4.88% | 2.11% |
| ALAB ASTERA LABS INC | 3.02% | 0.54% |
| CRDO CREDO TECHNOLOGY GROUP HOLDING LTD | 2.01% | 0.44% |
| MTSI MACOM TECHNOLOGY SOLUTIONS INC | 1.17% | 0.28% |
| ENTG ENTEGRIS INC | 1.22% | 0.25% |
Only in SOXX
iShares Semiconductor ETF — semiconductors. Its biggest holdings that VXF 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 VXF
Vanguard Extended Market ETF — US mid/small completion. Its biggest holdings that SOXX doesn’t have:
| SNOW Snowflake Inc. | 1.03% |
| NET Cloudflare Inc. Class A | 0.90% |
| BE Bloom Energy Corp. Class A | 0.87% |
| RKLB Rocket Lab Corp. | 0.80% |
| FLEX Flex Ltd. | 0.65% |
| MSTR MicroStrategy Inc. Class A | 0.59% |
| LNG Cheniere Energy Inc. | 0.57% |
| FERG Ferguson Enterprises Inc./DE | 0.52% |
So — mostly different. Should you hold both?
SOXX and VXF 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 ~76 effective positions (grade A), because they hold largely different securities.
Holdings as of — SOXX: Jun 30, 2026 (iShares (BlackRock)); VXF: 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 VXF — FAQ
- How much do SOXX and VXF overlap?
- SOXX and VXF overlap by approximately 18% measured by portfolio weight — that is the share of the smaller fund's holdings (by weight) that also sit inside the other. 1 of SOXX's 10 largest holdings are also held by VXF. They share 5 of their listed top holdings in total.
- Is it redundant to hold both SOXX and VXF?
- 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 76 positions and a A diversification grade.
- What does VXF hold that SOXX doesn't?
- VXF's largest holdings that SOXX doesn't hold include SNOW, NET, BE, RKLB, FLEX. Its category is US mid/small completion, versus SOXX's semiconductors.
- Which is more concentrated, SOXX or VXF?
- SOXX's top 10 holdings are 61% of its listed weight; VXF's are 42%. The more concentrated fund leans harder on its largest names.