MarketAxess (MKTX) had the highest return in March 2023 by a mid-cap US stock in the S&P 500 (GSPC), returning 15%.
![money illustration](https://cdn.statmuse.com/finance/asset_img/kanedama-cyborg-01-min--fc2wcyxt.png)
MarketAxess (MKTX) had the highest return in March 2023 by a mid-cap US stock in the S&P 500 (GSPC), returning 15%.
Mid-cap stocks are treated as having a market cap between $2B and $10B.