Holding(s) in Company

TR-1: notification of major interests in shares

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

Invensys plc

2. Reason for the notification  (please tick the appropriate box or boxes)

An acquisition or disposal of voting rights 

Χ 

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An event changing the breakdown of voting rights

Other (please specify): 

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

Prudential plc group of companies

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

See attached schedule

5. Date of the transaction (and date on which the threshold is crossed or reached if different):

12 May 2009

6. Date on which issuer notified:

13 May 2009

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

11% to 10%

8. Notified details:

A: Voting rights attached to shares

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 viii

Number of shares

Number of voting rights ix

% of voting rights

Direct

Direct x

Indirect xi

Direct

Indirect

GB00B19DVX61

89,257,210

89,257,210

87,986,432

87,986,432

10.97%

B: Financial Instruments

Resulting situation after the triggering transaction xii

Type of financial instrument

Expiration date xiii

Exercise/ Conversion Period/ Date xiv

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

% of voting rights

N/A

N/A

N/A

N/A

N/A

Total (A+B)

Number of voting rights

% of voting rights

87,986,432

10.97%

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

Prudential plc (parent Company)

M&G Group Limited (wholly owned subsidiary of Prudential plc)

M&G Limited (wholly owned subsidiary of M&G Group Limited)

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited)

The Prudential Assurance Company Limited (a wholly owned subsidiary of Prudential plc)

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

12. Date on which proxy holder will cease to hold voting rights:

N/A

13. Additional information:

14. Contact name:

Steve Devany, Head of Corporate Communications

15. Contact telephone number:

020 7821 3758.