Interactive Data 10-Q 2009 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO RULE 13a-14(b) OR RULE 15d-14(b)

OF THE SECURITIES EXCHANGE ACT OF 1934 AND 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report on Form 10-Q of Interactive Data Corporation (the “Company”) for the quarter ended September 30, 2009 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Raymond L. D’Arcy, Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 4, 2009	/s/ Raymond L. D’Arcy
	Raymond L. D’Arcy
	Chief Executive Officer
	(principal executive officer)