Interactive Data's ComStock Delivers Comprehensive Tick Data Service for Global Securities

Assists Clients in Meeting Compliance Mandates and Analysing Market Activity for Algorithmic Trading Applications

ComStock, an Interactive Data (NYSE: IDC) business and a leading provider of real-time global market data and managed solutions, today announced PlusTick, a new service that will provide financial institutions with access to high-quality tick and trade data for global securities.

By offering comprehensive securities information in an easy-to-use format, PlusTick can help clients to more effectively comply with 'best trade execution' and other government mandates, and back-test and analyse algorithmic trading applications designed to improve investment performance.

PlusTick, which is currently available, unites ComStock's vast resource of real-time, low latency data with a robust database. With this new fully managed service, clients can identify a list of covered financial instruments, and PlusTick can deliver full tick and trade data for these securities on an intra-day or daily basis. PlusTick is designed to be seamlessly integrated into a broad range of financial applications and existing quote and trade databases, which can enable clients to access a comprehensive source of financial information without altering their workflow.

The new service offers comprehensive Level I and Level II information from over 60 markets around the world, including major US and European exchanges. Clients can receive information for a range of data elements, including trade, bid, ask, volume, open, high, low and close.

"In light of developing compliance mandates in both the United States and Europe for ‘best trade execution' of securities trades and the continued emergence of algorithmic trading applications, it is critical for global firms to have access to high-quality information that can be delivered when they need it and in a format that easily integrates into their current systems and processes," said Mark Hepsworth, president of ComStock. "By offering a fully managed service, PlusTick can enable clients to focus on their core business instead of data management, helping them to more effectively utilise the massive volume of data that flows through the financial markets."

Additional information on PlusTick, including a full list of all supported markets, is available at http://www.comstock-interactivedata.com/PlusTick.shtml.

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 data feed. Also managed as part of the ComStock group is Interactive Data Managed Solutions, a leading provider and operator of customised 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: +1 781-687-8148Email: [email protected]