INTERACTIVE DATA'S COMSTOCK STRENGTHENS GLOBAL REAL-TIME SALES ORGANIZATION

Experienced Sales Professionals Focused on Expanding ComStock's Growing Institutional Market Share

White Plains, NY and London, December 11, 2006 – ComStock, an Interactive Data (NYSE: IDC) business and a leading provider of real-time global market data and managed solutions, today announced that it has substantially enhanced its global real-time sales organization with a number of new appointments.

The ComStock sales organization is led in North America by Richard O'Dea, who joined the company in April 2006 as vice president of sales, and in Europe, Middle East and Africa by regional sales directors Rob Lane and Herve Ferro.

The new members of ComStock's global team who have joined the company during the past year include the following sales managers:

Mike Cirillo – Mike has 17 years of experience in the market data industry. Before joining ComStock, he managed sales territories in the northeastern United States for Reuters America, with a particular focus on building relationships with top-tier hedge funds.

Julie Chang – Julie comes to ComStock with over 10 years of financial services experience, most recently having spent numerous years in sales at Reuters America. At Reuters, she focused on managing key account relationships, winning new business within the buy side and developing programs with prime brokerages.

Jeff Kenney – Jeff has more than 8 years of experience in the financial services industry, most recently working with FT Interactive Data where he managed relationships with a number of the company's strategic partners.

John Moores – John has more than 10 years of experience in the real-time data industry, including sales positions in the commodities and energy sector at Reuters/MoneylineTelerate, and at FactSet, where he was responsible for institutional sales of market data, history and news.

Jean Baptiste Nouvion – Jean Baptiste has 5 years of experience in the real-time data industry. He previously worked for Reuters as a key account manager.

John Purvis – John has more than 6 years of experience in the financial service industry. Prior to his position at ComStock, he was at SunGard Data Management Solutions, where he managed sales for a suite of services, including real-time datafeeds, web-based data solutions, a historical time series data storage container and analytical tools. Before SunGard, John was an account manager at Reuters where he managed sales for a real-time suite of products.

Finn Schioldan – Finn has worked in the financial services industry for more than 16 years and brings vast knowledge of the various asset classes. He joins Interactive Data from Thomson Financial.

"We have been seeing an accelerated demand for ComStock's real-time offerings from financial institutions over the past year, and have been strengthening our sales teams in the US and Europe to help capitalize on this market opportunity," said Mark Hepsworth, president of ComStock. "Institutional customers are using ComStock to provide real time data to their algorithmic trading applications, or as an alternative global datafeed provider for either primary or back up purposes. We need to ensure that we have the right level of salespeople in place to meet this demand."

About Interactive Data Corporation

Interactive Data Corporation (NYSE: IDC) is a leading global provider of financial market data, analytics and related services to financial institutions, active traders and individual investors. The Company's businesses supply time-sensitive pricing, evaluations and reference data for more than 3.5 million securities traded around the world, including hard-to-value instruments. Many of the world's best-known financial service and software companies subscribe to the Company's services in support of their trading, analysis, portfolio management and valuation activities. Through its businesses, FT Interactive Data, ComStock, CMS BondEdge and eSignal, Interactive Data has approximately 2,200 employees in offices located throughout North America, Europe, Asia and Australia, and is headquartered in Bedford, MA. Pearson plc (NYSE: PSO; LSE: PSON), an international media company, whose businesses include the Financial Times Group, Pearson Education, and the Penguin Group, owns approximately 62 percent of the outstanding common stock of Interactive Data Corporation.

ComStock is a leading provider of real-time global market data to financial institutions, redistributors and online financial portals worldwide. ComStock's suite of services includes PlusFeed, a consolidated, low latency datafeed. Also managed as part of the ComStock group is Interactive Data Managed Solutions, a leading provider and operator of customized financial market information systems. For more information about Interactive Data and its businesses, please visit www.interactivedata.com.

For further information, please contact:

Investors

Andrew Kramer

Tel: +1 781-687-8306

Email: [email protected]

Media

Sue Mitchell (European media)

Tel: +44 (0)20 7825 8076

Email: [email protected]

John Coffey (US Media)

Tel: +1 781-687-8148

Email: [email protected]