IDC Interactive Data Corp.

BT Radianz, one of the leading global providers of financial services connectivity, announced today that ComStock, an Interactive Data business (NYSE: IDC) and a leading provider of real-time global market data, will use BT Radianz's shared market infrastructure to expand access to its market data services to include PlusFeed, ComStock's high-speed digital data feed, in both Europe and North America. Leading banks, brokerages and money management firms use ComStock's high-speed, real-time financial information globally to power their revenue critical market data applications. Distribution through BT Radianz can enable ComStock to reach more than 10,000 financial institution locations around the world. Mark Hepsworth, president, ComStock, said: "BT Radianz's broad connectivity will make it easier and add a compelling reason for institutions to take ComStock's PlusFeed. With the substantial increases in algorithmic trading and data volumes, the BT Radianz offering - low latency, resilient, scalable, fully redundant, external connectivity - becomes even more important. The continuing trend in algorithmic trading to move from directional to event-driven models has reinforced the need for a consolidated feed that offers both contributed and exchange-based low latency quotes, news and reference data. We deliver real-time data from over 350 sources and exchanges worldwide, covering more than 2,300,000 instruments." Kevin Covington, Head of Product Development, BT Radianz, said: "Connectivity continues to be a key factor in the investment process, particularly when access to fast, reliable market data is necessary to maintain a strong position in the market. With the growth of algorithmic trading and the new policies proposed by both MiFID and Reg NMS, achieving the lowest possible latency is a major industry issue our customers need to address. We have constructed a network which is designed to facilitate fast, direct access for the distribution of this vital market information that will assist our customers both in their compliance with new market regulations and in maintaining the competitive edge." At a ComStock-hosted roundtable on the growth of algorithmic trading and its effect on market data feeds, a key issue discussed was the critical challenge surrounding the integration of market data into algorithmic trading applications, which are consistently varied and rewritten. Integration of market data into algorithmic trading applications is vital, and one of the biggest challenges is to manage the rapid growth of data volumes coming from the exchanges and other sources. (More information about the roundtable is available at: www.ftinteractivedata.com/news_events/newsletters/connect/2006/winter/ index.shtml) About Interactive Data 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, dividend, corporate action 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 and managed solutions to financial institutions, redistributors and online financial portals worldwide. ComStock's suite of services ranges from a consolidated, low latency data feed, to tools for building, managing and hosting customized applications. For more information about the ComStock business, please visit www.interactivedata.com. About BT Radianz BT Radianz is one of the leading providers of secure, reliable, and scalable connectivity and hosting to the global financial services community. BT Radianz's shared market infrastructure offers a platform optimized for the time-critical demands unique to financial services. The BT Radianz network connects more than 10,000 financial sites around the world through a single, redundant, fully-managed connection, while also providing access to more than 400 pre-trade, trade, and post-trade applications from nearly 200 of the world's leading content and service providers across the straight-through processing (STP) chain. BT Radianz is part of BT Global Services. One Community One Connection One Focus www.btradianz.com About BT BT is one of the world's leading providers of communications solutions and services operating in 170 countries. Its principal activities include networked IT services, local, national and international telecommunications services, and higher-value broadband and internet products and services. BT consists principally of four lines of business: BT Global Services, Openreach, BT Retail and BT Wholesale. In the year ended 31 March 2006, BT Group's revenue was GBP 19,514 million with profit before taxation of GBP 2,040 million. British Telecommunications plc (BT) is a wholly-owned subsidiary of BT Group and encompasses virtually all businesses and assets of the BT Group. BT Group plc is listed on stock exchanges in London and New York. For more information, visit www.bt.com/aboutbt