DIA vs IJH: how much do they really overlap?
DIA (SPDR Dow Jones Industrial Average ETF, tracking the Dow Jones Industrial Average) and IJH (iShares Core S&P Mid-Cap ETF, tracking the S&P MidCap 400) overlap by roughly 0% by weight. 0 of DIA's top 10 holdings also appear in IJH. A 50/50 blend of the two behaves like about 75 equally-weighted bets (diversification grade A). In short, the two funds hold almost none of the same securities — they are complementary, not redundant.
The same companies, in both funds
These 0 holdings appear in both DIA and IJH. The weight columns show how much of each fund each name represents.
| Holding | in DIA | in IJH |
|---|
Only in DIA
SPDR Dow Jones Industrial Average ETF — US blue-chip (Dow 30). Its biggest holdings that IJH 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 IJH
iShares Core S&P Mid-Cap ETF — US mid-cap. Its biggest holdings that DIA doesn’t have:
| TWLO TWILIO INC CLASS A | 0.86% |
| CRS CARPENTER TECHNOLOGY CORP | 0.84% |
| MKSI MKS | 0.82% |
| CW CURTISS WRIGHT CORP | 0.77% |
| NVT NVENT ELECTRIC PLC | 0.75% |
| ENTG ENTEGRIS INC | 0.75% |
| ATI ATI INC | 0.74% |
| ILMN ILLUMINA INC | 0.73% |
So — essentially different. Should you hold both?
DIA and IJH hold almost none of the same securities — they are complementary, not redundant. Held together they genuinely broaden your exposure — a 50/50 blend reaches ~75 effective positions (grade A), because they hold largely different securities.
Holdings as of — DIA: Jun 29, 2026 (State Street Global Advisors); IJH: Jun 30, 2026 (iShares (BlackRock)). 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 →DIA vs IJH — FAQ
- How much do DIA and IJH overlap?
- DIA and IJH overlap by approximately 0% 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 IJH. They share 0 of their listed top holdings in total.
- Is it redundant to hold both DIA and IJH?
- 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 75 positions and a A diversification grade.
- What does IJH hold that DIA doesn't?
- IJH's largest holdings that DIA doesn't hold include TWLO, CRS, MKSI, CW, NVT. Its category is US mid-cap, versus DIA's US blue-chip (Dow 30).
- Which is more concentrated, DIA or IJH?
- DIA's top 10 holdings are 59% of its listed weight; IJH's are 27%. The more concentrated fund leans harder on its largest names.