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 types of fixed-income securities, will announce its 2012 first quarter results on Wednesday, April 25, 2012. Richard M. McVey, chairman and chief executive officer, and Antonio L. DeLise, chief financial officer, will host a conference call to discuss the Company’s financial results and outlook on Wednesday, April 25, 2012, at 10:00 a.m. Eastern time. To access the conference call, please dial 866.761.0748 (U.S.) or 617.614.2706 (international). The passcode for all callers is 21617969. The Company will also host a live audio Webcast of the conference call on the Investor Relations section of the Company's website at http://www.marketaxess.com. A replay of the call will be made available by dialing 888.286.8010 (U.S.) or 617.801.6888 (international) for one week after the announcement. The passcode for replay callers is 73799204. The Webcast will also be archived on http://www.marketaxess.com for 90 days following the announcement. About MarketAxess MarketAxess operates a leading electronic trading platform that enables investment industry professionals to efficiently trade corporate bonds and other types of fixed-income instruments. MarketAxess’ patented trading technology allows institutional investor clients to request competitive, executable bids or offers from multiple broker-dealers simultaneously, and to execute trades with the broker-dealer of their choice. Over 850 institutional investors are active users of the MarketAxess trading platform, accessing the global liquidity provided by MarketAxess’ 87 broker-dealer clients 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.