DIA vs VOOG: how much do they really overlap?
DIA (SPDR Dow Jones Industrial Average ETF, tracking the Dow Jones Industrial Average) and VOOG (Vanguard S&P 500 Growth ETF, tracking the S&P 500 Growth) overlap by roughly 25% by weight. 7 of DIA's top 10 holdings also appear in VOOG. A 50/50 blend of the two behaves like about 30 equally-weighted bets (diversification grade C). In short, the two funds share a meaningful core of the same megacaps, but each also brings real exposure the other lacks.
The same companies, in both funds
These 13 holdings appear in both DIA and VOOG. The weight columns show how much of each fund each name represents.
| Holding | in DIA | in VOOG |
|---|---|---|
| MSFT Microsoft Corporation | 4.20% | 9.29% |
| GOOGL Alphabet Inc. | 4.03% | 6.15% |
| AAPL Apple Inc. | 3.21% | 6.37% |
| AMZN Amazon.com, Inc. | 2.73% | 3.89% |
| NVDA NVIDIA Corporation | 2.22% | 14.26% |
| JPM JPMorgan Chase & Co. | 3.75% | 1.43% |
| CAT Caterpillar Inc. | 11.76% | 1.13% |
| JNJ Johnson & Johnson | 2.94% | 0.89% |
| V Visa Inc. | 3.89% | 0.84% |
| GS The Goldman Sachs Group, Inc. | 11.61% | 0.53% |
| IBM International Business Machines Corporation | 3.16% | 0.40% |
| AMGN Amgen Inc. | 4.10% | 0.34% |
| AXP American Express Company | 3.88% | 0.32% |
Only in DIA
SPDR Dow Jones Industrial Average ETF — US blue-chip (Dow 30). Its biggest holdings that VOOG doesn’t have:
| UNH UnitedHealth Group Incorporated | 4.78% |
| HD The Home Depot, Inc. | 3.99% |
| SHW The Sherwin-Williams Company | 3.92% |
| TRV The Travelers Companies, Inc. | 3.78% |
| MCD McDonald's Corporation | 3.04% |
| HON Honeywell International Inc. | 2.59% |
| BA The Boeing Company | 2.44% |
| CVX Chevron Corporation | 1.92% |
Only in VOOG
Vanguard S&P 500 Growth ETF — US large-cap growth. Its biggest holdings that DIA doesn’t have:
| AVGO Broadcom Inc. | 5.89% |
| GOOG Alphabet Inc. Class C | 4.89% |
| META Facebook Inc. Class A | 3.84% |
| MU Micron Technology Inc. | 3.04% |
| LLY Eli Lilly & Co. | 2.43% |
| BRK.B Berkshire Hathaway Inc. Class B | 2.42% |
| AMD Advanced Micro Devices Inc. | 2.34% |
| TSLA Tesla Inc. | 2.11% |
So — partly overlapping. Should you hold both?
DIA and VOOG share a meaningful core of the same megacaps, but each also brings real exposure the other lacks. Held together they keep a shared megacap core but each still pulls in exposure the other lacks, so a 50/50 blend spreads to ~30 effective positions (grade C).
Holdings as of — DIA: Jun 29, 2026 (State Street Global Advisors); VOOG: 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 →DIA vs VOOG — FAQ
- How much do DIA and VOOG overlap?
- DIA and VOOG overlap by approximately 25% measured by portfolio weight — that is the share of the smaller fund's holdings (by weight) that also sit inside the other. 7 of DIA's 10 largest holdings are also held by VOOG. They share 13 of their listed top holdings in total.
- Is it redundant to hold both DIA and VOOG?
- Because they share a meaningful core of the same megacaps, but each also brings real exposure the other lacks, holding both is partly redundant: you double up on a shared core (MSFT) while each fund still adds distinct exposure. A 50/50 blend has an effective 30 positions and a C diversification grade.
- What does VOOG hold that DIA doesn't?
- VOOG's largest holdings that DIA doesn't hold include AVGO, GOOG, META, MU, LLY. Its category is US large-cap growth, versus DIA's US blue-chip (Dow 30).
- Which is more concentrated, DIA or VOOG?
- DIA's top 10 holdings are 59% of its listed weight; VOOG's are 67%. The more concentrated fund leans harder on its largest names.