TR1 Announcement

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: ii

AVEVA GROUP PLC

2. Reason for the notification:

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 are attached ( )

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments ( )

An event changing the breakdown of voting rights ( )

Other (please specify): ( )

3. Full name of person(s) subject to the notification obligation: iii

BlackRock, Inc.

4. Full name of shareholder(s) (if different from 3.):iv

N/A

5. Date of the transaction and date on which the threshold is crossed or reached: v

18th December 2009

6. Date on which issuer notified:

22nd December 2009

7. Threshold(s) that is/are crossed or reached: vi, vii

Holding has gone below 20%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type of shares

if possible using the ISIN CODE

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB00B15CMQ74

11,705,631

11,705,631

N/A

N/A

11,290,764

N/A

16.64%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date xiii

Exercise/  Conversion Period xiv

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date xvii

Exercise/ Conversion period xviii

Number of voting rights instrument refers to

% of voting 

rights xix, xx

CFD

N/A

N/A

N/A

Nominal

Delta

2,256,747

3.33%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

13,547,511

19.97%

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

BlackRock Investment Management (UK) Limited - 13,547,511 (19.97%)

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:

BlackRock Compliance Disclosures Team

14. Contact name:

James Kidd

15. Contact telephone number:

01223 556 738