DIA vs SMH: how much do they really overlap?
DIA (SPDR Dow Jones Industrial Average ETF, tracking the Dow Jones Industrial Average) and SMH (VanEck Semiconductor ETF, tracking the MVIS US Listed Semiconductor 25) overlap by roughly 2% by weight. 0 of DIA's top 10 holdings also appear in SMH. A 50/50 blend of the two behaves like about 30 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 SMH. The weight columns show how much of each fund each name represents.
| Holding | in DIA | in SMH |
|---|---|---|
| NVDA NVIDIA Corporation | 2.22% | 18.16% |
Only in DIA
SPDR Dow Jones Industrial Average ETF — US blue-chip (Dow 30). Its biggest holdings that SMH 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 SMH
VanEck Semiconductor ETF — semiconductors. Its biggest holdings that DIA doesn’t have:
| TSM Taiwan Semiconductor Manufacturing Company Limited | 9.04% |
| MU Micron Technology, Inc. | 5.99% |
| AVGO Broadcom Inc. | 5.49% |
| AMD Advanced Micro Devices, Inc. | 5.44% |
| AMAT Applied Materials, Inc. | 5.35% |
| INTC Intel Corporation | 5.09% |
| LRCX Lam Research Corporation | 5.00% |
| KLAC KLA Corporation | 4.94% |
So — essentially different. Should you hold both?
DIA and SMH hold almost none of the same securities — they are complementary, not redundant. Held together they genuinely broaden your exposure — a 50/50 blend reaches ~30 effective positions (grade B), because they hold largely different securities.
Holdings as of — DIA: Jun 29, 2026 (State Street Global Advisors); SMH: Jun 27, 2026 (VanEck). Refreshed monthly. Overlap is measured across each fund’s largest holdings (top 25); the diffuse long tail barely moves the math.
See this for YOUR whole portfolio, free →DIA vs SMH — FAQ
- How much do DIA and SMH overlap?
- DIA and SMH 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 SMH. They share 1 of their listed top holdings in total.
- Is it redundant to hold both DIA and SMH?
- 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 30 positions and a B diversification grade.
- What does SMH hold that DIA doesn't?
- SMH's largest holdings that DIA doesn't hold include TSM, MU, AVGO, AMD, AMAT. Its category is semiconductors, versus DIA's US blue-chip (Dow 30).
- Which is more concentrated, DIA or SMH?
- DIA's top 10 holdings are 59% of its listed weight; SMH's are 69%. The more concentrated fund leans harder on its largest names.