ETF and Mutual Fund Analysis

Holdings as of September 30, 2025 (ITOT) and March 31, 2026 (VOO)

ETF and Mutual Fund Analysis

Overlap, Comparison, and Diversification for Your Portfolio

Home > Compare > ITOT vs VOO Holdings as of September 30, 2025 (ITOT) and March 31, 2026 (VOO)

ITOT vs VOO: Portfolio Overlap

iShares Core S&P Total U.S. Stock Market ETF vs Vanguard 500 Index Fund

82.5%
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
VOO
504 equity holdings
as of March 31, 2026
475 stocks held in common
Overlap View Venn Diagram
82.5% OVERLAP ITOT VOO
Overlapping Holdings
10 Top 10 of 475 shared, by overlap contribution
# Stock ITOT VOO Overlap%
1
NVDA
 7.02% 7.59% 7.02%
2
AAPL
 5.83% 6.68% 5.83%
3
MSFT
 5.94% 4.93% 4.93%
4
AMZN
 3.29% 3.65% 3.29%
5
AVGO
 2.39% 2.63% 2.39%
6
META
 2.46% 2.24% 2.24%
7
GOOGL
 2.18% 3.00% 2.18%
8
TSLA
 1.93% 1.87% 1.87%
9
GOOG
 1.75% 2.40% 1.75%
10
BRK.B
 1.42% 1.57% 1.42%
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
Linde PLC0.34%
Accenture PLC0.24%
Eaton Corp PLC0.22%
Medtronic PLC0.19%
Chubb Ltd0.16%
Only in VOO — VANGUARD 500 INDEX FUND
StockWeight
LIN0.41%
ETN0.25%
ACN0.22%
CB0.21%
MDT0.20%

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

ITOT (iShares Core S&P Total U.S. Stock Market ETF) and VOO (Vanguard 500 Index Fund) share 82.5% portfolio overlap as of ITOT's September 30, 2025 filing and VOO's March 31, 2026 filing, across 475 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 VOO 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 VOO?

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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