Interactive Data plans to integrate the acquired OFS assets into its U.S. Managed Solutions group, which is part of Interactive Data Real-Time Services. The Company expects to retain a number of employees currently affiliated with the OFS business, which has operations in Minneapolis, New York City and San Francisco. As part of the plans to migrate the OFS customers into Interactive Data's technical infrastructure, Interactive Data and Dow Jones have entered into a transition services agreement for hosting and other related services for up to two years.

Interactive Data is a leading global provider of customizable, Web-based hosted solutions through its Managed Solutions group. More than 470 customers worldwide utilize the Company's Web-based solutions to help address the information needs of their clients and internal users, differentiate their offerings, optimize workflows and reduce operating and capital costs. Acquiring the data and tools assets of the OFS business will substantially expand Interactive Data's growing Web-based solutions business in North America. This acquisition will also create opportunities for Interactive Data to expand OFS's existing relationships with major U.S.-based financial institutions by offering them a broader range of sophisticated Web-based offerings, real-time market data services and other desktop solutions.

"We believe that acquiring these OFS assets will further accelerate the progress we've made over the past several years to rapidly grow our Web-based solutions business in North America," stated Ray D'Arcy, Interactive Data's president and chief executive officer. "We see attractive opportunities for us to further expand OFS's business with its institutional customers by offering them a much broader range of services and solutions. In addition, this acquisition will bring us valuable development and support resources that can help us further scale this part of our business."

Assuming the transaction closes within the next several weeks, Interactive Data anticipates that the transaction will be cash flow positive and earnings neutral in 2009 and 2010, and, through a combination of planned revenue growth and operational synergies, accretive to earnings by 2011.

Interactive Data Corporation Forward-looking and Cautionary Statements

This press release contains certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and Federal securities laws, and is subject to the safe-harbor created by such Act and laws. Forward-looking statements include our statements discussing future financial conditions, results or projections, including statements relating to (i) the anticipated impact of the OFS acquisition on our business, including any impact on our earnings and cash flow, (ii) the anticipated timing of the closing, (iii) our plans to broaden the OFS customer relationships by marketing additional products and services to OFS customers, (iv) our plans to migrate OFS into the Interactive Data Managed Solutions technical infrastructure, and (v) our plans to combine OFS and Interactive Data Managed Solutions to achieve operational synergies and revenue growth, including the acquisition being accretive to earnings by 2011. These statements are subject to known and unknown risks, uncertainties, assumptions, and other factors that may cause actual results to be materially different from those contemplated by the forward-looking statements. Such factors include: the acquisition may not close on a timely basis or at all; we may not be successful in our efforts to integrate the OFS assets into our business, including that we may not be able to obtain the consent of all OFS customers to the assignment of their OFS contacts by the Seller to us; and we may not be able to retain key employees of OFS. Other factors include, but are not limited to: (i) the presence of competitors with greater financial resources than ours and their strategic response to our services and products; (ii) a possible decline in activity levels in the global securities markets; (iii) new offerings by competitors or new technologies that could cause our products or services to become less competitive or obsolete; and (iv) other factors identified in our most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission. We undertake no obligation to update these forward-looking statements.

About Interactive Data Corporation

Interactive Data Corporation (NYSE: IDC) is a leading global provider of financial market data, analytics and related solutions to financial institutions, active traders and individual investors. The Company's businesses supply real-time market data, time-sensitive pricing, evaluations and reference data for millions of 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. Interactive Data, headquartered in Bedford, Mass., has approximately 2,400 employees in offices located throughout North America, Europe, Asia and Australia. 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's Managed Solutions business is a leading provider and operator of customized financial information systems. The group builds and manages Web-based financial market data portals and terminals for a range of organizations worldwide, from retail and investment banks to asset managers, online brokers, stock exchanges and media portals. By aggregating a broad set of financial data and client-proprietary content and offering visually stunning features such as charts, sophisticated search functions, decision-support tools and analytics, these intuitive applications can help customers optimize their business processes and realize efficiencies. This group is managed as part of the Interactive Data's Real-Time Services business, which provides a comprehensive suite of offerings that includes PlusFeed (SM), a consolidated, low-latency digital datafeed.

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

SOURCE: Interactive Data Corporation

Interactive Data Corporation 
Investors 
Andrew Kramer, +1-781-687-8306 
andrew.kramer@interactivedata.com 
or 
Media 
Sue Mitchell (European media), +44 (0)20 7825 8076 
sue.mitchell@interactivedata.com 
or 
John Coffey (U.S. media), +1-781-687-8148 
john.coffey@interactivedata.com

    <<
    -   Consolidated Data Feed from the TMX Information Processor suite of
        products;
    -   Toronto Stock Exchange and TSX Venture Exchange Level 1 and 2 data;
    -   Montreal Exchange data;
    -   S&P/TSX index data;
    -   Corporate and reference information, including CDS data licensed from
        TMX;
    -   TSX/CP Equities News, a news service developed jointly by TMX
        Datalinx and The Canadian Press (CP), which delivers comprehensive
        coverage of Canadian capital markets; and
    -   CanDeal data, a marketplace for Canadian fixed income securities
    >>

"Interactive Data is a leading global financial information services company and TMX Datalinx is very pleased that they provide a variety of TMX's robust Canadian market data to their clients," said Eric Sinclair.

"We are excited to participate in today's market opening. We enjoy an extensive relationship with TMX Group, redistributing a broad range of its content to our clients worldwide through our desktop solutions and low latency real-time data feeds," said Ray D'Arcy.

For Market Openings: Media may pick up a feed from the TOC (television operations centre) for all market open ceremonies. The feed is named TSX Transmit 2 and is produced at the TMX Broadcast Centre and sent live to the TOC. Those featured in the market opening move into position for the market open ceremony at approximately 9:27 a.m. and the markets will open with the sound of a siren (the traditional market open on Toronto Stock Exchange) at 9:30 a.m.

    <<
    About TMX Group (TSX-X)
    -----------------------
    >>

TMX Group's key subsidiaries operate cash and derivative markets for multiple asset classes including equities, fixed income and energy. Toronto Stock Exchange, TSX Venture Exchange, Montreal Exchange, Natural Gas Exchange, Boston Options Exchange (BOX), Shorcan, Equicom and other TMX Group companies provide trading markets, clearing facilities, data products and other services to the global financial community. TMX Group is headquartered in Toronto with offices in Montreal, Calgary and Vancouver. For more information about TMX Group, visit our website at www.tmx.com.

    <<
    About Interactive Data Corporation
    ----------------------------------
    >>

Interactive Data Corporation (NYSE: IDC) is a leading global provider of financial market data, analytics and related solutions to financial institutions, active traders and individual investors. The Company's businesses supply real-time market data, time-sensitive pricing, evaluations and reference data for millions of 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. Interactive Data, headquartered in Bedford, Mass., has approximately 2,400 employees in offices located throughout North America, Europe, Asia and Australia. 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. For more information about Interactive Data Corporation and its businesses, please visit www.interactivedata.com

SOURCE: TSX Group Inc.

SOURCE: TMX Group Inc.

SOURCE: Toronto Stock Exchange

SOURCE: TSX Corporate Announcements

Carolyn Quick, Director, Corporate Communications, TMX Group, (416) 947-4597,
carolyn.quick@tsx.com; Brian Willinsky, Public Relations Manager, North America,
Interactive Data Corporation, (339) 203-0769, brian.willinsky@interactivedata.com

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"Regional and alternative exchanges represent a growing element of our customers' trading strategies and we aim to ensure that they can have access to the venues they need," said Hilary London, general manager, EMEA, Interactive Data Real-Time Services. "By delivering such depth and breadth of coverage, PlusFeed can provide a wide range of data to trading applications at financial institutions worldwide."

PlusFeed's coverage of new alternative European markets also continues to grow with the addition of two multilateral trading facilities (MTFs), NASDAQ OMX and BATS Europe. PlusFeed continues to further increase its broad coverage of MTFs, as well as electronic communication networks (ECNs).

In addition, Interactive Data recently signed an agreement with XData, a market data solutions provider for the Middle East and Africa (MEA) region, to supply financial market data from exchanges in the Gulf Cooperation Countries (GCC) via PlusFeed. The exchanges covered are: Abu Dhabi Securities Exchange (United Arab Emirates), Bahrain Stock Exchange (Bahrain), Doha Securities Market (Qatar), Dubai Financial Market (United Arab Emirates), Muscat Securities Market (Oman), NASDAQ Dubai (United Arab Emirates) and Tadawul (Saudi Arabia).

Since PlusFeed's launch in 2005, Interactive Data has continuously expanded and enhanced its real-time market data coverage. Today, PlusFeed delivers low-latency data on over six million securities from more than 450 sources around the world, including multi-asset class instrument coverage and extensive Level 2 data. The feed is used by financial institutions globally to power algorithmic and electronic trading applications.

About Interactive Data Corporation

Interactive Data Corporation (NYSE: IDC) is a leading global provider of financial market data, analytics and related solutions to financial institutions, active traders and individual investors. The Company's businesses supply real-time market data, time-sensitive pricing, evaluations and reference data for millions of 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. Interactive Data, headquartered in Bedford, Mass., has approximately 2,400 employees in offices located throughout North America, Europe, Asia and Australia. 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's Real-Time Services business is a leading provider of real-time global market data to financial institutions, redistributors and online financial portals worldwide. Offerings from Interactive Data include PlusFeed(SM), a consolidated, low-latency datafeed. Also managed as part of this group is Interactive Data's Managed Solutions business, 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(SM) and the Interactive Data logo are service marks of Interactive Data Corporation. PlusFeed(SM) is a service mark of Interactive Data Real-Time Services.

SOURCE: Interactive Data Corporation

Interactive Data Corporation 
Investors 
Andrew Kramer, +1 781-687-8306 
andrew.kramer@interactivedata.com 
or 
Media 
US media 
Brian Willinsky, +1 781-687-8291 
brian.willinsky@interactivedata.com 
or 
European media 
Eoin Bedford, +44 (0)20 7825 8353 
eoin.bedford@interactivedata.com