S&P 400

S&P 400
FoundationJune 19, 1991 (1991-06-19)
OperatorS&P Dow Jones Indices
Exchanges
Trading symbol
  • MID
  • ^MID
  • SP400
  • ^SP400
Constituents401
TypeMid-cap
Market capUS$3.1 trillion
(as of December 31, 2024)
Weighting methodFree-float capitalization-weighted
Related indices
List
Websitespglobal.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.