VO vs VOO ETF holdings comparison
Vanguard Mid-Cap ETF (VO) · Vanguard S&P 500 ETF (VOO)
VO and VOO overlap by 16.4% by portfolio weight. The remaining 83.6 percentage points are not counted as shared holdings weight by this calculation. They share 248 stocks; the largest shared position is Western Digital Corp (WDC), contributing 0.34% to the overlap.
What this means
VO and VOO share a smaller portion of their portfolio weight in the same underlying stocks. OverlapCheck labels this "low holdings overlap" using house ranges of 70% or more, 30% to under 70%, and under 30%. These descriptive ranges are not industry standards or investment guidance. Holdings overlap does not measure correlation, volatility, geographic or factor exposure, fees, or suitability.
Overlap by weight sums the smaller of the two funds' weights for every stock they both hold. It answers "how much of my money is in the same stocks either way?" See methodology.
This comparison covers normalized equity positions represented in the dataset. Cash, derivatives, options, structured notes, and other non-equity assets are not included, so the result is not a complete comparison of every asset or risk in either fund.
Top shared holdings
| Company | Ticker | in VO | in VOO |
|---|---|---|---|
| Western Digital Corp | WDC | 1.06% | 0.34% |
| Seagate Technology Holdings PLC | STX | 1.05% | 0.34% |
| Vertiv Holdings Co | VRT | 1.22% | 0.20% |
| Quanta Services Inc | PWR | 1.04% | 0.17% |
| Howmet Aerospace Inc | HWM | 1.04% | 0.17% |
| Newmont Corp | NEM | 0.48% | 0.15% |
| Cummins Inc | CMI | 0.95% | 0.15% |
| Fortinet Inc | FTNT | 0.46% | 0.15% |
| Williams Cos Inc/The | WMB | 0.44% | 0.14% |
| Johnson Controls International plc | JCI | 0.43% | 0.14% |
Holdings only in VO or VOO
VO has 34 fund-only positions representing approximately 8.6 percentage points of reported exposure; VOO has 256 fund-only positions representing approximately 83.3 percentage points of reported exposure. These are positions whose normalized security identifiers appear in one issuer file but not the other.
Largest positions only in VO
| Company | Ticker | Weight |
|---|---|---|
| Bloom Energy Corp | BE | 0.79% |
| Cloudflare Inc | NET | 0.76% |
| Rocket Lab Corp | RKLB | 0.57% |
| Cheniere Energy Inc | LNG | 0.48% |
| Ferguson Enterprises Inc | FERG | 0.45% |
| Waste Connections Inc | WCN | 0.41% |
| Snowflake Inc | SNOW | 0.41% |
| Alnylam Pharmaceuticals Inc | ALNY | 0.39% |
| Coreweave Inc | CRWV | 0.37% |
| Astera Labs Inc | ALAB | 0.36% |
Largest positions only in VOO
| Company | Ticker | Weight |
|---|---|---|
| NVIDIA Corp | NVDA | 7.51% |
| Apple Inc | AAPL | 6.59% |
| Microsoft Corp | MSFT | 4.30% |
| Amazon.com Inc | AMZN | 3.62% |
| Alphabet Inc | GOOGL | 3.25% |
| Broadcom Inc | AVGO | 2.77% |
| Alphabet Inc | GOOG | 2.59% |
| Micron Technology Inc | MU | 2.02% |
| Meta Platforms Inc | META | 1.92% |
| Tesla Inc | TSLA | 1.84% |
FAQ
How much do VO and VOO overlap?
VO and VOO have 16.4% overlap by weight, sharing 248 equity positions (out of 282 in VO and 504 in VOO). The official holdings files used are dated 2026-06-30 for VO and 2026-06-30 for VOO.
What does 16.4% overlap mean?
VO and VOO share a smaller portion of their portfolio weight in the same underlying stocks. OverlapCheck labels this "low holdings overlap" using house ranges of 70% or more, 30% to under 70%, and under 30%. These descriptive ranges are not industry standards or investment guidance. Holdings overlap does not measure correlation, volatility, geographic or factor exposure, fees, or suitability.
Which stocks do VO and VOO both hold?
The largest shared positions are Western Digital Corp, Seagate Technology Holdings PLC, Vertiv Holdings Co, Quanta Services Inc, Howmet Aerospace Inc. The top shared holdings with weights in each fund are shown on this page.
What holdings are different between VO and VOO?
VO has 34 positions not found in VOO, while VOO has 256 positions not found in VO. The largest fund-only positions and their weights are shown on this page.