INTERACTIVE DATA AND PROQUOTE CO-OPERATE ON REAL-TIME DATA BEST EXECUTION PRODUCT

London : 12 November 2007
Interactive Data Corporation (NYSE: IDC), a leading provider of financial market data, analytics and related services, and Proquote, the London Stock Exchange's real-time market data and trading terminal, have signed an agreement whereby Interactive Data will provide level 1 and level 2 real-time data from MiFID-zone European exchanges to Proquote's Transaction Cost Analysis (TCA) system.

To help customers comply with newly introduced MiFID legislation on cost and quality of execution, the Proquote Transaction Cost Analysis (TCA) system provides a full report on what a best transaction could have been, a summary of execution quality and the shortfall. By using data supplied by Interactive Data's low latency, digital datafeed, PlusFeedSM, Proquote compares the details of the specific trade entered with the order book volumes and prices over the period of the execution, from order entry to notice of execution.

Karen Young, Head of Business Development Information Services at the London Stock Exchange said: "Interactive Data offers high quality information which will provide in-depth European exchange data for Proquote customers. As investment firms now may have to submit their order books to several markets to get the best possible execution price, the Proquote Transaction Cost Analysis (TCA) system has helped meet our customer demands for statistics on what the 'best' execution would have been for the order."

David Hann, general manager, EMEA, Interactive Data Real-Time Services, added: "We have been making significant effort to source data from the new pricing venues and existing regulated markets providing MiFID services, and we are delighted to provide this data to Proquote for their best execution product. PlusFeed continues to be a one-stop shop for real-time data requirements, including MiFID-related content."

Interactive Data offers a broad, cohesive range of data and services to help customers comply with the obligations that have been imposed by the Markets in Financial Instruments Directive (MiFID). These include real-time and reference data services to help customers with the requirements of pre- and post-trade transparency, evidencing best execution, trade venue selection and reviews of order execution policy, code of conduct and client classification obligations, transaction reporting, managing conflicts of interest and managing risk.

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, Interactive Data Pricing and Reference Data, Interactive Data Real-Time Services, Interactive Data Fixed Income Analytics, and eSignal, the Company has approximately 2,200 employees in offices located throughout North America, Europe, Asia and Australia. The Company is headquartered in Bedford, Mass. Pearson plc (NYSE: PSO; LSE: PSON), an international media company, whose businesses include the Financial Times Group, Pearson Education, and the Penguin Group, is Interactive Data Corporation's majority stockholder.

Interactive Data Real-Time Services is a leading provider of real-time global market data to financial institutions, redistributors and online financial portals worldwide. Offerings from Interactive Data Real-Time Services include PlusFeed, a consolidated, low latency datafeed. Also managed as part of this business is Interactive Data Managed Solutions, a leading provider and operator of customised financial market information systems.

For more information about Interactive Data Corporation and its businesses, please visit www.interactivedata.com

Interactive Data and the Interactive Data logo are service marks of Interactive Data Corporation.

About Proquote
Owned by the London Stock Exchange, Proquote provides real-time market data coverage of the global markets. Its powerful display and analysis tools deliver the most up to date information on over 100 markets, news and data sources throughout the trading day. Proquote's extensive coverage includes information on futures, options, commodities, metals and OTC derivatives and features comprehensive fundamentals, charting analytical tools. Its software is based on Windows technology which can be installed on individual PCs and eliminates the need for separate terminals. Proquote has over 300 clients and a rapidly growing presence in all areas of the financial sector.

For further information about Interactive Data please contact:

INTERACTIVE DATA CORPORATION:

Investors

Andrew Kramer
Tel: +1 781-687-8306
Email: andrew.kramer@interactivedata.com

Media

Sue Mitchell (European media)
Tel: +44 (0)20 7825 8076 
Email: sue.mitchell@interactivedata.com

John Coffey (US Media)
Tel:  +1 781-687-8148

PROQUOTE:

Fiona Hurst
Tel: +44 (0) 20 7797 1222
Email: newsroom@londonstockexchange.com