Weir Group Regulatory News (WEIR)

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached:

Weir Group Plc

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 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 thenotification 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 onwhich the threshold is crossed orreached:

04 July 2011

6. Date on which issuer notified:

05 July 2011

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

See item 13

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

GB0009465807

10,642,618

10,642,618

10,604,101

10,604,101

5.01%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/Conversion Period

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date

Exercise/Conversion period

Number of voting rights instrument refers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

10,604,101

5.01%

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

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 (wholly owned subsidiary of Prudential plc)

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will ceaseto hold:

N/A

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

N/A

13. Additional information:

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited) has gone below a 5% notifiable interest, triggering this notification.

14. Contact name:

Ajay Patel / Mark Thomas

M&G Investment Management Limited

15. Contact telephone number:

020 7548 3261 / 020 7548 3266

PRUDENTIAL PLC

Registered Holder

Holding

% Voting Rights

NORTRUST NOMINEE LTD A/C MHE01

150,000

NORTRUST NOMINEE LTD A/C MHF01

46,477

NORTRUST NOMINEE LTD A/C MHJ01

215,922

NORTRUST NOMINEE LTD A/C MKB01

47,386

NORTRUST NOMINEE LTD A/C MKD01

200,000

NORTRUST NOMS LTD

4,144

NORTRUST NOMS LTD A/C PUS01

8,546

PRUCLT HSBC GIS NOM(UK) PAC AC

9,764,486

PRUCLT HSBC GIS NOM(UK) PPL AC

167,140

Total

10,604,101

5.01

M&G GROUP LIMITED

Registered Holder

Holding

% Voting Rights

NORTRUST NOMINEE LTD A/C MHE01

150,000

NORTRUST NOMINEE LTD A/C MHF01

46,477

NORTRUST NOMINEE LTD A/C MHJ01

215,922

NORTRUST NOMINEE LTD A/C MKB01

47,386

NORTRUST NOMINEE LTD A/C MKD01

200,000

NORTRUST NOMS LTD

4,144

NORTRUST NOMS LTD A/C PUS01

8,546

PRUCLT HSBC GIS NOM(UK) PAC AC

9,764,486

PRUCLT HSBC GIS NOM(UK) PPL AC

167,140

Total

10,604,101

5.01

M&G LIMITED

Registered Holder

Holding

% Voting Rights

NORTRUST NOMINEE LTD A/C MHE01

150,000

NORTRUST NOMINEE LTD A/C MHF01

46,477

NORTRUST NOMINEE LTD A/C MHJ01

215,922

NORTRUST NOMINEE LTD A/C MKB01

47,386

NORTRUST NOMINEE LTD A/C MKD01

200,000

NORTRUST NOMS LTD

4,144

NORTRUST NOMS LTD A/C PUS01

8,546

PRUCLT HSBC GIS NOM(UK) PAC AC

9,764,486

PRUCLT HSBC GIS NOM(UK) PPL AC

167,140

Total

10,604,101

5.01

THE PRUDENTIAL ASSURANCE COMPANY LIMITED

Registered Holder

Holding

% Voting Rights

PRUCLT HSBC GIS NOM(UK) PAC AC

9,764,486

PRUCLT HSBC GIS NOM(UK) PPL AC

167,140

Total

9,931,626

4.69

Percentage holdings are calculated using 211,317,552 Total Voting Rights