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 third quarter results on Wednesday, October 31, 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, October 31, 2012, at 10:00 a.m. Eastern time. To access the conference call, please dial 877-299-4454 (U.S.) or +1-617-597-5447 (international). The passcode for all callers is 42452936. 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 +1-617-801-6888 (international) for one week after the announcement. The passcode for replay callers is 41146492. 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 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 www.marketaxess.com.