Fidessa Group Regulatory News (FDSA)

For filings with the FSA include the annex

For filings with the issuer exclude the annex

TR-1: Notification of Major Interests in Shares

Identity of the issuer or the underlying issuer of existing Fidessa Group plcshares to 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 instruments which may

result in the acquisition of shares already issued to which voting rights areattached

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: Inc.

4. Full name of shareholder(s) (if different from 3.): See Schedule A

5. Date of the transaction and date on which the 13 March 2013 threshold is crossed reached: 6. Date on which the issuer notified: 14 March 2013 7. Threshold(s) that is/are crossed or reached: Below 6% 8. Notified details: A: Voting rights attached to shares Situation previous to the Resulting situation after the triggeringClass/type of Triggering transaction transactionshares Ifpossible Number of shares Number of voting % of votingusing the Number of Number of rights rightsISIN CODE shares voting rights Direct Indirect Direct Indirect Direct Indirect Ordinary Shares 2,244,900 2,244,900 2,225,571 2,225,571 5.976% (ISIN:GB00B24CT194) B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of Expiration Exercise/ Number of voting rights that may be % offinancial date Conversion acquired if the instrument is votinginstrument Period exercised/converted rights C: Financial Instruments with similar economic effect to Qualifying FinancialInstruments Resulting situation after the triggering transaction Type of Exercise Expiration Exercise/ Number of voting rights % of votingfinancial price date Conversion instrument refers to rightsinstrument period xviii Nominal Delta Total (A+B+C)

Number of voting rights % of voting rights

2,225,571 5.976%

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

financial instruments are effectively held, if applicable: See Schedule A Proxy 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:

Note: Annex should only be submitted to the FSA not the issuer

Annex Notification of Major Interests in Shares

A: Identity of the person or legal entity subject to the notificationobligation

The Capital Group

Full name (including legal form for legal entities) Companies, Inc.

333 South Hope Street, 55th FloorContact address (registered office for legal entities) Los Angeles, California 90071 (213) 615-0469Phone number & email GRGroup@capgroup.com Other useful information (at least legalrepresentative for legal persons) B: Identity of the notifier, if applicable Christopher AquinoFull name 333 South Hope Street, 55thContact address Floor Los Angeles, California 90071 (213) 615-0469Phone number

Other useful information (e.g. functional relationship with Fax: (213)the person or legal entity subject to the notification

615-4056obligation) C: Additional Information

Due to a company reorganization, Capital Group International, Inc. ("CGII") andCapital Research and Management Company ("CRMC") will no longer report relevantholdings separately. With effect from 1 September 2012, the holdings undermanagement will be reported in aggregate by the group's parent company, TheCapital Group Companies, Inc.

Schedule A Number of Percent of shares outstanding The Capital Group Companies, Inc. ("CG") 2,225,571 5.976%holdings Holdings by CG Management Companies andFunds: Capital Research and Management Company The Income Fund of America 2,225,571 5.976%