Consent of Deloitte & Touche LLP (eSpeed, Inc.)

EX-23.3 6 dex233.htm CONSENT OF DELOITTE & TOUCHE LLP (ESPEED, INC.) Consent of Deloitte & Touche LLP (eSpeed, Inc.)

Exhibit 23.3

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Amendment No. 2 to Registration Statement No. 333-150308 on Form S-1 of our report dated March 14, 2008, relating to the consolidated financial statements of eSpeed, Inc. and subsidiaries, appearing in the Prospectus, which is part of this Registration Statement.

We also consent to the reference to us under the heading “Experts” in such Prospectus.

/s/ Deloitte & Touche LLP

June 4, 2008

New York, New York