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10-Q - FORM 10-Q - MARKETAXESS HOLDINGS INCc23532e10vq.htm
EX-32.2 - EX-32.2: CERTIFICATION - MARKETAXESS HOLDINGS INCc23532exv32w2.htm
EX-31.1 - EX-31.1: CERTIFICATION - MARKETAXESS HOLDINGS INCc23532exv31w1.htm
EX-31.2 - EX-31.2: CERTIFICATION - MARKETAXESS HOLDINGS INCc23532exv31w2.htm
EXCEL - IDEA: XBRL DOCUMENT - MARKETAXESS HOLDINGS INCFinancial_Report.xls
Exhibit 32.1
Certification Under Section 906 of the Sarbanes-Oxley Act of 2002
(United States Code, Title 18, Chapter 63, Section 1350)
Accompanying Quarterly Report on Form 10-Q of
MarketAxess Holdings Inc. for the Quarter Ended September 30, 2011
In connection with the Quarterly Report on Form 10-Q of MarketAxess Holdings Inc. (the “Company”) for the quarter ended September 30, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Richard M. McVey, Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, that:
(1)  
The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and
(2)  
The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
         
  /s/ RICHARD M. MCVEY    
  Richard M. McVey   
  Chief Executive Officer   
October 26, 2011
This certification shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that section, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, except to the extent the Company specifically incorporates it by reference.