Holding(s) in Company

For filings with the FSA include the annexFor filings with the issuer exclude the annex

TR-1: Notification of Major Interests in Shares

1. Identity of the issuer or the Fidessa Group plcunderlying issuer of existing sharesto which voting rights are attached: 2. Reason for the notification (please tick the appropriate box or boxes): An acquisition or disposal of voting rights X

An acquisition or disposal of qualifying financial instrumentswhich may result in the acquisition of shares already issued towhich voting rights are attached

An acquisition or disposal of instruments with similar economiceffect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (pleasespecify): 3) Full name of person(s) subject to the The Capital Group Companies, Inc. notification obligation: 4) Full name of shareholder(s) (if See Schedule A different from 3.): 5) Date of the transaction and date on 19 March 2013 which the threshold is crossed reached: 6) Date on which the issuer notified: 20 March 2013 7) Threshold(s) that is/are crossed or Below 5% reached: 8. Notified details:

A: Voting rights attached to shares

Class/type of Situation previous to Resulting situation after the triggering transactionshares If the Triggeringpossible using transactionthe ISIN CODE Number of Number of Number of shares Number of voting % of voting rights shares voting rights rights Direct Indirect Direct Indirect Direct Indirect Ordinary 2,006,652 2,006,652 1,779,783 1,779,783 4.779% Shares (GB0007590234)

B: Qualifying Financial Instruments

Resulting situation after the triggering transactionType of Expiration date Exercise/Conversion Number of voting % of voting financial Period rights that may be rightsinstrument acquired if the instrument is exercised/converted N/A

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of Exercise Expiration Exercise/ Number of voting % of voting rightsfinancial price date Conversion rights instrumentinstrument period refers to xviii N/A Nominal Delta Total (A+B+C) Number of voting rights % of voting rights 1,779,783 4.779%

9) Chain of controlled undertakings through which the voting rights and/or the

financial instruments are effectively held, if applicable:

See Schedule AProxy Voting: 10) Name of the proxy holder: 11) Number of voting rights proxy holder will cease to hold: 12) Date on which proxy holder will cease to hold voting rights: 13) Additional information: 14) Contact Name: 15) Contact telephone number: Schedule A Number of shares Percent of outstanding

The Capital Group Companies, Inc. ("CG") holdings 1,779,783 4.779%

Holdings by CG Management Companies and Funds:Capital Research and Management CompanyThe Income Fund of America 1,779,783

4.779%