DIA vs SOXX: how much do they really overlap?
DIA (SPDR Dow Jones Industrial Average ETF, tracking the Dow Jones Industrial Average) and SOXX (iShares Semiconductor ETF, tracking the NYSE Semiconductor) overlap by roughly 2% by weight. 0 of DIA's top 10 holdings also appear in SOXX. A 50/50 blend of the two behaves like about 39 equally-weighted bets (diversification grade B). In short, the two funds hold almost none of the same securities — they are complementary, not redundant.
The same companies, in both funds
These 1 holdings appear in both DIA and SOXX. The weight columns show how much of each fund each name represents.
| Holding | in DIA | in SOXX |
|---|---|---|
| NVDA NVIDIA Corporation | 2.22% | 6.81% |
Only in DIA
SPDR Dow Jones Industrial Average ETF — US blue-chip (Dow 30). Its biggest holdings that SOXX doesn’t have:
| CAT Caterpillar Inc. | 11.76% |
| GS The Goldman Sachs Group, Inc. | 11.61% |
| UNH UnitedHealth Group Incorporated | 4.78% |
| MSFT Microsoft Corporation | 4.20% |
| AMGN Amgen Inc. | 4.10% |
| GOOGL Alphabet Inc. | 4.03% |
| HD The Home Depot, Inc. | 3.99% |
| SHW The Sherwin-Williams Company | 3.92% |
Only in SOXX
iShares Semiconductor ETF — semiconductors. Its biggest holdings that DIA doesn’t have:
| MU MICRON TECHNOLOGY INC | 8.54% |
| AMD ADVANCED MICRO DEVICES INC | 8.09% |
| 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% |
| MRVL MARVELL TECHNOLOGY INC | 4.88% |
So — essentially different. Should you hold both?
DIA and SOXX hold almost none of the same securities — they are complementary, not redundant. Held together they genuinely broaden your exposure — a 50/50 blend reaches ~39 effective positions (grade B), because they hold largely different securities.
Holdings as of — DIA: Jun 29, 2026 (State Street Global Advisors); SOXX: Jun 30, 2026 (iShares (BlackRock)). Refreshed monthly. Overlap is measured across each fund’s largest holdings (top 33); the diffuse long tail barely moves the math.
See this for YOUR whole portfolio, free →DIA vs SOXX — FAQ
- How much do DIA and SOXX overlap?
- DIA and SOXX overlap by approximately 2% measured by portfolio weight — that is the share of the smaller fund's holdings (by weight) that also sit inside the other. 0 of DIA's 10 largest holdings are also held by SOXX. They share 1 of their listed top holdings in total.
- Is it redundant to hold both DIA and SOXX?
- Because they hold almost none of the same securities — they are complementary, not redundant, holding both is not redundant — each fund covers largely different holdings, so together they broaden your exposure. A 50/50 blend has an effective 39 positions and a B diversification grade.
- What does SOXX hold that DIA doesn't?
- SOXX's largest holdings that DIA doesn't hold include MU, AMD, INTC, AVGO, AMAT. Its category is semiconductors, versus DIA's US blue-chip (Dow 30).
- Which is more concentrated, DIA or SOXX?
- DIA's top 10 holdings are 59% of its listed weight; SOXX's are 61%. The more concentrated fund leans harder on its largest names.