Valued at a market cap of $6.7 billion, MarketAxess Holdings Inc. (MKTX) is a financial technology company that operates an electronic trading platform for institutional investors and broker-dealers. The New York-based company primarily focuses on fixed-income securities, including corporate bonds, municipal bonds, U.S. high-grade and high-yield debt, emerging-market debt, and Eurobonds. Companies worth$2 billion or more are typically classified as “mid-cap stocks,” and MKTX fits the label perfectly, wit ...