ITOT vs VOO ETF holdings comparison
iShares Core S&P Total U.S. Stock Market ETF (ITOT) · Vanguard S&P 500 ETF (VOO)
ITOT and VOO overlap by 82.5% by portfolio weight. The remaining 17.5 percentage points are not counted as shared holdings weight by this calculation. They share 498 stocks; the largest shared position is NVIDIA Corp. (NVDA), contributing 6.63% to the overlap.
The holdings dates differ. This can slightly understate overlap for funds tracking similar indexes.
What this means
ITOT and VOO share most of their portfolio weight in the same underlying stocks. OverlapCheck labels this "high 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 ITOT | in VOO |
|---|---|---|---|
| NVIDIA Corp. | NVDA | 6.63% | 7.58% |
| Apple, Inc. | AAPL | 5.81% | 6.66% |
| Microsoft Corp. | MSFT | 3.79% | 4.91% |
| Amazon.com, Inc. | AMZN | 3.19% | 3.64% |
| Alphabet, Inc. | GOOGL | 2.86% | 2.99% |
| Broadcom, Inc. | AVGO | 2.45% | 2.62% |
| Alphabet, Inc. | GOOG | 2.29% | 2.40% |
| Meta Platforms, Inc. | META | 1.69% | 2.24% |
| Tesla, Inc. | TSLA | 1.62% | 1.87% |
| Eli Lilly & Co. | LLY | 1.30% | 1.30% |
Holdings only in ITOT or VOO
ITOT has 1952 fund-only positions representing approximately 12.4 percentage points of reported exposure; VOO has 5 fund-only positions representing approximately 0.4 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 ITOT
| Company | Ticker | Weight |
|---|---|---|
| Marvell Technology, Inc. | MRVL | 0.36% |
| Space Exploration Technologies Corp. | SPCX | 0.14% |
| Snowflake, Inc. | SNOW | 0.12% |
| Bloom Energy Corp. | BE | 0.11% |
| Cloudflare, Inc. | NET | 0.11% |
| Honeywell International, Inc. | HON | 0.10% |
| Honeywell Aerospace, Inc. | HONA | 0.10% |
| Astera Labs, Inc. | ALAB | 0.09% |
| Flex Ltd. | FLEX | 0.08% |
| Rocket Lab Corp. | RKLB | 0.07% |
Largest positions only in VOO
| Company | Ticker | Weight |
|---|---|---|
| Honeywell International Inc | HON | 0.26% |
| Carnival Corp | CCL1EUR | 0.05% |
| Coterra Energy Inc | CTRA | 0.05% |
| DuPont de Nemours Inc | DD | 0.03% |
| Hologic Inc | HO1 | 0.03% |
FAQ
How much do ITOT and VOO overlap?
ITOT and VOO have 82.5% overlap by weight, sharing 498 equity positions (out of 2450 in ITOT and 503 in VOO). The official holdings files used are dated 2026-06-30 for ITOT and 2026-03-31 for VOO.
What does 82.5% overlap mean?
ITOT and VOO share most of their portfolio weight in the same underlying stocks. OverlapCheck labels this "high 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 ITOT and VOO both hold?
The largest shared positions are NVIDIA Corp., Apple, Inc., Microsoft Corp., Amazon.com, Inc., Alphabet, Inc.. The top shared holdings with weights in each fund are shown on this page.
What holdings are different between ITOT and VOO?
ITOT has 1952 positions not found in VOO, while VOO has 5 positions not found in ITOT. The largest fund-only positions and their weights are shown on this page.