Weir Group Regulatory News (WEIR)

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

Weir Group plc, The

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

An acquisition or disposal of voting rights

Yes

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:

Baillie Gifford & Co

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

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

3 Aug 2010

6. Date on which issuer notified:

12 Aug 2010

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

5%

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

Number of shares

Number of voting rights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

Ordinary

Share

GB0009465807

12173278

12173278

Below 5%

Below 5%

Below 5%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ Conversion Period

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

% of voting rights

 N/A

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

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date

Exercise/ Conversion period

Number of voting rights instrument refers to

% of voting rights

N/A

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

Below 5%

Below 5%

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

In the narrative below, the figures in [ ] indicate the amount of voting rights and the percentage held by each controlled undertaking where relevant.

Baillie Gifford & Co, a discretionary investment manager, is the parent undertaking of an investment management group.

 Its wholly-owned subsidiary undertaking Baillie Gifford Overseas Limited [1315300; 0.6%] is also a discretionary investment manager.

Its wholly-owned subsidiary undertaking Baillie Gifford & Co Limited [626762; 0.3%] is an OEIC Authorised Corporate Director and Unit Trust Manager which has delegated its discretionary investment management role to Baillie Gifford & Co.

Its wholly-owned subsidiary undertaking Baillie Gifford Life Limited [3056503; 1.5%] is a life assurance company which procures discretionary investment management services from Baillie Gifford & Co in respect of its own account shareholdings.

Proxy Voting:

10. Name of the proxy holder:

N/A

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:

Gillian Wright

15. Contact telephone number:

0131 275 3041