| Foundation | June 19, 1991; 34 years ago (1991-06-19) |
|---|---|
| Operator | S&P Dow Jones Indices[1] |
| Exchanges | |
| Trading symbol |
|
| Constituents | 400 |
| Type | Mid-cap[1] |
| Market cap | US$3.5 trillion (as of January 30, 2026)[2] |
| Weighting method | Free-float capitalization-weighted[3] |
| Related indices | List |
| Website | spglobal.com/sp-400 |
TheS&P MidCap 400 Index, more commonly known as theS&P 400, is astock market index fromS&P Dow Jones Indices.
The S&P 400 index serves as a gauge for the U.S.mid-cap equities sector and is the most widely followed mid-cap index. It is part of theS&P 1500, which also includes theS&P 500 for larger U.S.-based companies, and theS&P 600 for smaller companies, although all three indices include a handful of foreign stocks that trade on the U.S. stock exchanges.
To be included in the index, a stock must have a total market capitalization that ranges from $8 billion to $22.7 billion.[4] These market cap eligibility criteria are for addition to an index, not for continued membership. As a result, an index constituent that appears to violate criteria for addition to that index is not removed unless ongoing conditions warrant an index change.[4]
Additionally, as with theS&P 500 and theS&P 600, there is a financial viability requirement. Companies must have positive as-reported earnings from the most recent quarter, as well as over the most recent four quarters (summed together).
As of January 2026, the median market cap was $7.5 billion, with the market cap of the largest company in the index at $35.5 billion and the smallest company at $1.79 billion. The index's total market cap covers about five percent of the total U.S. stock market.
| Category | All-Time Highs | |
|---|---|---|
| Closing | 3,592.93 | Monday, February 9, 2026 |
| Intraday | 3,620.99 | Wednesday, February 11, 2026 |
The followingexchange-traded funds (ETFs) attempt to track the index and sub-indexes:
Index Fund
Growth Index Fund
Value Index Fund
The SPDR fund was first, but the iShares fund is larger; they also have different structures.[8]
The "S&P 400" is generally quoted as aprice return index; there are also "total return" and "net total return" versions of the index. These versions differ in howdividends are accounted. The price return version does not account for dividends; it only captures the changes in the prices of the index components. Thetotal return version reflects the effects of dividend reinvestment. Finally, the net total return version reflects the effects of dividend reinvestment after the deduction ofwithholding tax.
| Year | Price return | Total return | Net total return |
|---|---|---|---|
| 2025 | 5.90% | 7.50% | 7.02% |
| 2024 | 12.20% | 13.93% | 13.41% |
| 2023 | 14.45% | 16.44% | 15.84% |
| 2022 | −14.48% | −13.06% | −13.49% |
| 2021 | 23.21% | 24.76% | 24.29% |
| 2020 | 11.81% | 13.66% | 13.10% |
| 2019 | 24.05% | 26.20% | 25.55% |
| 2018 | −12.50% | −11.08% | −11.51% |
| 2017 | 14.45% | 16.24% | 15.70% |
| 2016 | 18.73% | 20.74% | 20.13% |
| 2015 | −3.71% | −2.18% | −2.64% |
| 2014 | 8.19% | 9.77% | 9.29% |
| 2013 | 31.57% | 33.50% | 32.92% |
| 2012 | 16.07% | 17.88% | 17.33% |
| 2011 | −3.10% | −1.73% | −2.14% |
| 2010 | 24.85% | 26.64% | 26.10% |
| 2009 | 35.00% | 37.38% | 36.66% |
| 2008 | −37.28% | −36.23% | −36.55% |
| 2007 | 6.69% | 7.98% | N/A |
| 2006 | 8.99% | 10.32% | N/A |
| 2005 | 11.27% | 12.56% | N/A |
| 2004 | 15.16% | 16.48% | N/A |
| Sources:[9][10] | |||
As of January 30, 2026:[11]