ETF and Mutual Fund Analysis

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

ETF and Mutual Fund Analysis

Overlap, Comparison, and Diversification for Your Portfolio

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

ITOT vs SPYM: Portfolio Overlap

iShares Core S&P Total U.S. Stock Market ETF vs State Street(R) SPDR(R) Portfolio S&P 500(R) ETF

84.9%
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
SPYM
503 equity holdings
as of March 31, 2026
501 stocks held in common
Overlap View Venn Diagram
84.9% OVERLAP ITOT SPYM
Overlapping Holdings
10 Top 10 of 501 shared, by overlap contribution
# Stock ITOT SPYM Overlap%
1
NVDA
 7.02% 7.58% 7.02%
2
AAPL
 5.83% 6.67% 5.83%
3
MSFT
 5.94% 4.92% 4.92%
4
AMZN
 3.29% 3.64% 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
RBLX0.14%
MSTR0.13%
SNOW0.12%
MRVL0.11%
NET0.10%
Only in SPYM — State Street(R) SPDR(R) Portfolio S&P 500(R) ETF
StockWeight
Q0.04%
Amcor PLC0.03%

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

ITOT (iShares Core S&P Total U.S. Stock Market ETF) and SPYM (State Street(R) SPDR(R) Portfolio S&P 500(R) ETF) share 84.9% portfolio overlap as of ITOT's September 30, 2025 filing and SPYM's March 31, 2026 filing, across 501 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 SPYM 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 SPYM?

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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