Holding(s) in Company

TR-1: Notifications of Major Interests in Shares

1. Identity of the issuer or the underlying issuer Fidessa Group

PLC

of existing shares to which voting rights areattached:

2. Reason for notification (yes/no)

Yes

An acquisition or disposal of voting rights

No

An acquisition or disposal of financial instruments which may resultin the acquisition of shares already issued to which voting rightsare attached

No

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

No

An event changing the breakdown of voting rights

No

Other (please specify):___________________________

3. Full name of person(s) subject to Ameriprise Financial, Inc. and its groupnotification obligation:

4. Full name of shareholder(s) (if See additional information under 13.different from 3):

5. Date of transaction and date on 16 May 2013which the threshold is crossed orreached:

6. Date on which issuer notified: 20 May 2013

7. Threshold(s) that is/are crossed or Above the threshold of 5%reached:

8: Notified Details

A: Voting rights attached to shares

Class/type Situation previous to Resulting situation after the triggeringof shares the triggering transaction

transactionIf possibleuse ISINcode Number of Number of Number of Number of voting Percentage of shares voting shares rights voting rights rights Direct Direct Indirect Direct Indirect GB0007590234 N/A N/A 38,372 38,372 1,894,278 0.103% 5.080%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of Expiration date Exercise/ No. of voting rights Percentagefinancial conversion that may be acquired of votinginstrument period if the instrument is rights exercised/converted.

C: Financial Instruments with similar economic effect to Qualifying FinancialInstruments

Resulting situation after the triggering transaction

Type of Exercise Expiration Exercise / No. of voting Percentage offinancial Price date conversion rights voting rightsinstrument period instrument refers to Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights 1,932,650 5.183%

9. Chain of controlled undertakings through which the voting rights and /orthe financial instruments are effectively held, if applicable:

Ameriprise Financial, Inc., which through intermediate holding companiescontrols the voting rights of Columbia Management Investment Advisers,Columbia Wanger Asset Management, Threadneedle Management Luxembourg S.A. andThreadneedle Asset Management Holdings Ltd, which itself controls the votingrights of Threadneedle Asset Management Ltd, Threadneedle International Ltdand Threadneedle Pensions Ltd. Proxy Voting: 10. Name of proxy holder: N/A 11. Number of voting rights proxy N/Aholder will cease to hold: 12. Date on which proxy holder will N/Acease to hold voting rights: 13. Additional information: Registered Owner Ameriprise Financial Inc A/c 22,389 Columbia Wanger Asset Management LLC A/c 291,983 HSBC Global Custody Nominee (UK) Limited A/c 740190 16,604 HSBC Global Custody Nominee (UK) Limited A/c 739874 77,971 HSBC Global Custody Nominee (UK) Limited A/c 740311 8,360 The Bank Of New York ( Nominees ) Limited A/c PTG 15303 / 09997799 7,363 Nortrust Nominees LTD A/c BBH05 14,743 Littledown Nominees Ltd A/c ZLA05 88,400 Littledown Nominees Ltd A/c ZLA07 800,000 Littledown Nominees Ltd A/c 27642 7,572 Littledown Nominees Ltd A/c 07197 30,800 Littledown Nominees Ltd A/c 10479 872 Littledown Nominees Ltd A/c ZLA12 28,405 Littledown Nominees Ltd A/c ZLA14 7,510 Littledown Nominees Ltd A/c 34789 45,600 Mellon Nominees (UK) Ltd A/c WWSF0004002 71,566 Littledown Nominees Ltd A/c 10491 208,574 Littledown Nominees Ltd A/c 10488 135,058 Littledown Nominees Ltd A/c 10490 68,880 14. Contact name: Stacey Dryburgh, Threadneedle group 15. Contact telephone name: 01793 363751