Below is a list of companies having stocks that are included in the S&P MidCap 400 stock market index. The index, maintained by S&P Dow Jones Indices, comprises the common stocks of 400 mid-cap, mostly American, companies. Although called the S&P 400, the index sometimes contains more than 400 stocks when it includes two or more share classes of stock from one of its component companies.
S&P MidCap 400 component stocks
==Selected past and announced changes to the list of S&P 400 components==
Selected past and announced changes to the list of S&P 400 components
S&P Dow Jones Indices updates the components of the S&P 400 periodically, typically in response to acquisitions, or to keep the index up to date as various companies grow or shrink in value.{{cite web|url=http://us.spindices.com/search/?query=s%26p+midcap+400&Search=GO&sortType=Date&resultsPerPage=25&ContentType=Announcement&Region=region-americas ==See also==