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Basic Info

The S&P MidCap 400 Index, more commonly known as the S&P 400, is a stock market index from S&P Dow Jones Indices. The index serves as a barometer for the U.S. mid-cap equities sector and is the most widely followed mid-cap index in existence. To be included in the index, a stock must have a total market capitalization that ranges from $1.4 billion to $5.9 billion at the time of addition to the index.
Core Index Name S&P 400
Return Type Price Return
Currency Code USD
Category Hedge Type Not Hedged

Index Varieties

Return Types
Net Total Return S&P 400 Net Total Return
Total Return S&P 400 Total Return

Total Return Performance

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Name
1M
3M
6M
1Y
3Y
5Y
10Y
15Y
-4.71%
3.00%
4.65%
15.97%
14.41%
6.59%
10.82%
10.66%
As of March 17, 2026. Returns for periods of 1 year and above are annualized.
View Periodic Total Returns Versus Peers
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Annual Performance

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Name
2019
2020
2021
2022
2023
2024
2025
YTD
26.20%
13.66%
24.76%
-13.06%
16.44%
13.93%
7.50%
2.98%
As of March 18, 2026.

Basic Info

The S&P MidCap 400 Index, more commonly known as the S&P 400, is a stock market index from S&P Dow Jones Indices. The index serves as a barometer for the U.S. mid-cap equities sector and is the most widely followed mid-cap index in existence. To be included in the index, a stock must have a total market capitalization that ranges from $1.4 billion to $5.9 billion at the time of addition to the index.
Core Index Name S&P 400
Return Type Price Return
Currency Code USD
Category Hedge Type Not Hedged

Index Varieties

Return Types
Net Total Return S&P 400 Net Total Return
Total Return S&P 400 Total Return