S&P 400
| Foundation | June 19, 1991 |
|---|---|
| Operator | S&P Dow Jones Indices |
| Exchanges | |
| Trading symbol |
|
| Constituents | 401 |
| Type | Mid-cap |
| Market cap | US$3.1 trillion (as of December 31, 2024) |
| Weighting method | Free-float capitalization-weighted |
| Related indices | List |
| Website | spglobal.com/sp-400 |
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.