ETF and Mutual Fund Analysis

Holdings as of September 30, 2025 (ITOT) and August 12, 2026 (SPY)

ETF and Mutual Fund Analysis

Overlap, Comparison, and Diversification for Your Portfolio

Home > Compare > ITOT vs SPY Holdings as of September 30, 2025 (ITOT) and August 12, 2026 (SPY)

ITOT vs SPY: Portfolio Overlap

iShares Core S&P Total U.S. Stock Market ETF vs SPDR® S&P 500® ETF Trust

79.3%
Weighted portfolio overlap
Very High Overlap

The two portfolios are structurally near-identical: most of the weight sits in the same stocks, so holding both concentrates rather than spreads capital. The tier describes what the data shows, not what to do about it.

ITOT
2484 equity holdings
as of September 30, 2025
SPY
505 equity holdings
as of August 12, 2026
468 stocks held in common
Overlap View Venn Diagram
79.3% OVERLAP ITOT SPY
Overlapping Holdings
10 Top 10 of 468 shared, by overlap contribution
# Stock ITOT SPY Overlap%
1
NVDA
 7.02% 8.14% 7.02%
2
AAPL
 5.83% 6.66% 5.83%
3
MSFT
 5.94% 5.49% 5.49%
4
AMZN
 3.29% 3.92% 3.29%
5
AVGO
 2.39% 2.95% 2.39%
6
GOOGL
 2.18% 3.02% 2.18%
7
META
 2.46% 1.91% 1.91%
8
GOOG
 1.75% 2.43% 1.75%
9
BRK.B
 1.42% 1.40% 1.40%
10
TSLA
 1.93% 1.38% 1.38%
Most Divergent Holdings Stocks held by one fund but absent from the other
Only in ITOT — iShares Core S&P Total U.S. Stock Market ETF
StockWeight
XOM0.74%
Linde PLC0.34%
Accenture PLC0.24%
Eaton Corp PLC0.22%
HON0.21%
Only in SPY — SPDR® S&P 500® ETF Trust
StockWeight
XOM0.99%
LIN0.33%
STX0.30%
ETN0.27%
CB0.19%

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Frequently Asked Questions (FAQs)
What is the portfolio overlap between ITOT and SPY?

ITOT (iShares Core S&P Total U.S. Stock Market ETF) and SPY (SPDR® S&P 500® ETF Trust) share 79.3% portfolio overlap as of ITOT's September 30, 2025 filing and SPY's August 12, 2026 filing, across 468 common stocks. Overlap is the sum of the smaller weight of each shared stock, so it reads as the share of a dollar that lands on the same companies in both funds.

Do ITOT and SPY invest in the same stocks?

Almost entirely. These funds hold nearly identical portfolios and offer little differentiation between them.

What are the top stocks held by both ITOT and SPY?

The most prominent shared holdings (by combined weight) are: NVDA, AAPL, MSFT. See the full common-holdings table on this page for weights in each fund.

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