ITOT vs SPY ETF holdings comparison
iShares Core S&P Total U.S. Stock Market ETF (ITOT) · SPDR S&P 500 ETF Trust (SPY)
ITOT and SPY overlap by 85.2% by portfolio weight. The remaining 14.8 percentage points are not counted as shared holdings weight by this calculation. They share 501 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 SPY 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 SPY |
|---|---|---|---|
| NVIDIA Corp. | NVDA | 6.63% | 7.80% |
| Apple, Inc. | AAPL | 5.81% | 6.88% |
| Microsoft Corp. | MSFT | 3.79% | 5.52% |
| Amazon.com, Inc. | AMZN | 3.19% | 3.86% |
| Alphabet, Inc. | GOOGL | 2.86% | 3.08% |
| Broadcom, Inc. | AVGO | 2.45% | 2.55% |
| Alphabet, Inc. | GOOG | 2.29% | 2.45% |
| Meta Platforms, Inc. | META | 1.69% | 1.89% |
| Micron Technology, Inc. | MU | 1.78% | 1.59% |
| Tesla, Inc. | TSLA | 1.62% | 1.49% |
Holdings only in ITOT or SPY
ITOT has 1949 fund-only positions representing approximately 12.5 percentage points of reported exposure; SPY has 2 fund-only positions representing approximately 1.0 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 |
|---|---|---|
| Exxon Mobil Corp. | XOM | 0.77% |
| Space Exploration Technologies Corp. | SPCX | 0.14% |
| Snowflake, Inc. | SNOW | 0.12% |
| Bloom Energy Corp. | BE | 0.11% |
| Cloudflare, Inc. | NET | 0.11% |
| Astera Labs, Inc. | ALAB | 0.09% |
| Rocket Lab Corp. | RKLB | 0.07% |
| Cheniere Energy, Inc. | LNG | 0.07% |
| Electronic Arts, Inc. | EA | 0.06% |
| Credo Technology Group Holding Ltd. | CRDO | 0.06% |
Largest positions only in SPY
| Company | Ticker | Weight |
|---|---|---|
| Exxonmobil Holdings Corp | XOM | 1.01% |
| Amcor Plc | AMCR | 0.03% |
FAQ
How much do ITOT and SPY overlap?
ITOT and SPY have 85.2% overlap by weight, sharing 501 equity positions (out of 2450 in ITOT and 503 in SPY). The official holdings files used are dated 2026-06-30 for ITOT and 2026-08-25 for SPY.
What does 85.2% overlap mean?
ITOT and SPY 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 SPY 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 SPY?
ITOT has 1949 positions not found in SPY, while SPY has 2 positions not found in ITOT. The largest fund-only positions and their weights are shown on this page.