JOINT FILING AGREEMENT

Exhibit 1

JOINT FILING AGREEMENT

     The undersigned hereby agree that this Amendment No. 4 to the Statement on Schedule 13D, dated May 5, 2010 (the “Schedule 13D”), with respect to the Common Stock, par value $.01 per share, of Interactive Data Corporation is, and any additional amendments executed by us shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and that this Agreement shall be included as an exhibit to the Schedule 13D and each such additional amendment. Each of the undersigned agrees to be responsible for the timely filing of the Schedule 13D and any additional amendments thereto, and for the completeness and accuracy of the information concerning itself contained therein. This agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

     IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the 5th day of May, 2010.

	XXXXXXX PLC
	By:	/s/ Xxxxx Xxxxxxxxx
		Name:	Xxxxx Xxxxxxxxx
		Title:	Chief Financial Officer and Director
	PEARSON OVERSEAS HOLDINGS LTD.
	By:	/s/ Xxxx X. Xxxxxx
		Name:	Xxxx X. Xxxxxx
		Title:	Director
	PEARSON NETHERLANDS B.V.
	By:	/s/ Xxxxxx X. Xxxxxxx
		Name:	Xxxxxx X. Xxxxxxx
		Title:	Director
	PEARSON LUXEMBOURG HOLDINGS NO. 2 LTD.
	By:	/s/ Xxxx X. Xxxxxx
		Name:	Xxxx X. Xxxxxx
		Title:	Director
	XXXXXXX LUXEMBOURG HOLDINGS SARL
	By:	/s/ Xxxx X. Xxxxxx
		Name:	Xxxx X. Xxxxxx
		Title:	Director

	XXXXXXX INC.
	By:	/s/ Xxxxxx X. Xxxxxxx
		Name:	Xxxxxx X. Xxxxxxx
		Title:	Executive Vice President and Director
	XXXXXXX LONGMAN, INC.
	By:	/s/ Xxxxxx X. Xxxxxxx
		Name:	Xxxxxx X. Xxxxxxx
		Title:	Executive Vice President and Director
	PEARSON DBC HOLDINGS, INC.
	By:	/s/ Xxxxxx X. Xxxxxxx
		Name:	Xxxxxx X. Xxxxxxx
		Title:	President