Holding(s) in Company

For filings with the FCA include the annex For filings with issuer exclude the annex TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi 1. Identity of the issuer or the underlying issuer of existing Fidessa Group plcshares to which voting rights are attached:ii 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 instruments which may resultin the acquisition of shares already issued to which voting rights are attached An acquisition or disposal of instruments with similar economic effect toqualifying financial instruments An event changing the breakdown of voting rights Other (please specify): 3. Full name of person(s) subject to the notification The Capital Group Companies,obligation:iii Inc. 4. Full name of shareholder(s) See Schedule A (if different from 3.):iv 5. Date of the transaction and date on which the threshold 16 April 2014is crossed or reached: v 6. Date on which issuer notified: 17 April 2014 7. Threshold(s) that is/are crossed or reached: vi, vii Above 7% 8. Notified details: A: Voting rights attached to shares viii, ix Class/type of Situation previous Resulting situation after the triggering transactionshares to the triggering transaction if possible Number Number Number Number of voting % of voting rightsusing of of of rights xthe ISIN CODE Shares Voting shares Rights Direct Direct xi Indirect xii Direct Indirect Ordinary Shares 2,332,200 2,332,200 2,898,200 7.6382% (GB0007590234) B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of Expiration Exercise/ Number of voting % of votingfinancial date xiii Conversion Period xiv rights that may be rightsinstrument acquired if the instrument is exercised/ converted. C: Financial Instruments with similar economic effect to Qualifying FinancialInstruments xv, xvi Resulting situation after the triggering transaction Type of Exercise price Expiration Exercise/ Number of voting rights % of votingfinancial date xvii Conversion instrument refers to rights xix, xxinstrument period xviii Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights 2,898,200 7.6382% 9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxi See Schedule A Proxy Voting: 10. Name of the proxy holder: 11. Number of voting rights proxy holder will ceaseto hold: 12. Date on which proxy holder will cease to holdvoting rights: 13. Additional information: 14. Contact name: 15. Contact telephone number: Schedule A Number of Percent of Shares Outstanding The Capital Group Companies, Inc. ("CG") 2,898,200 7.638%holdings Holdings by CG Management Companies and Funds: • Capital Guardian Trust Company 1,293,858 3.410% • Capital International Limited 307,042 0.809% • Capital International SÁrl 57,300 0.151% • Capital Research and Management Company 1,240,000 3.268% • The Income Fund of America