MarketAxess Holdings Inc. (Nasdaq: MKTX), the operator of a leading electronic trading platform for U.S. and European high-grade corporate bonds, emerging markets bonds and other fixed income securities, will be added to the S&P SmallCap 600 Index after close of trading on Friday, September 28. The S&P SmallCap 600 is maintained by S&P Dow Jones Indices as a measure of small companies, reflecting the risk and return characteristics of the broad small cap universe of firms. The Index consists of 600 stocks selected according to a range of criteria including corporate structure, exchange listings, market capitalization, financial viability, liquidity, sector representation and company type. MarketAxess will be added to the S&P SmallCap 600 Specialized Finance Sub-Industry index. This month MarketAxess was also ranked one of Fortune’s Fastest-Growing Companies for the second consecutive year, rising to #33 from #36 in 2011. About MarketAxess MarketAxess operates a leading electronic trading platform that enables fixed-income market participants to efficiently trade corporate bonds and other types of fixed-income instruments using MarketAxess' patented trading technology. Over 1,000 investor and broker-dealer firms are active users of the MarketAxess trading platform, accessing global liquidity in U.S. high-grade corporate bonds, European bonds, high yield and emerging markets bonds, agency bonds, asset-backed and preferred securities and credit default swaps. MarketAxess also offers a number of trading-related products and services, including: market data to assist clients with trading decisions; connectivity solutions that facilitate straight-through processing; technology services to optimize trading environments; and execution services for exchange-traded fund managers and other clients. MarketAxess maintains its headquarters in New York and has offices in London, Chicago, Salt Lake City, Hong Kong, Singapore and São Paulo. For more information, please visit http://www.marketaxess.com.