Holding(s) in Company

Weir Group PLC
18 October 2007


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:

The Weir Group PLC


2. Reason for the notification (please state Yes/No):

An acquisition or disposal of voting rights: (Yes)

An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached: (No)

An event changing the breakdown of voting rights: (No)

Other (please specify): Initial notification due to change of threshold for
non-material interest (No)


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

Ameriprise Financial, Inc. and its group


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

See additional information under 13.


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

17 October 2007


6. Date on which issuer notified:

18 October 2007


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

Below 5%


8. Notified details:

A: Voting rights attached to shares

Situation previous to the triggering transaction

Class/type of shares if possible using the   Number of      Number of voting
ISIN CODE                                    shares         Rights

GB0009465807                                 19,676,315     19,676,315



Resulting situation after the triggering transaction

Class/type of shares if Number of     Number of voting rights  % of voting
possible using the ISIN shares                                 rights
CODE
                        Direct        Direct     Indirect      Direct   Indirect

GB0009465807            10,450,300    285,571    10,164,729    0.137%   4.859%


B: Financial Instruments

Resulting situation after the triggering transaction

Type of     Expiration Exercise/     Number of voting rights that may   % of
financial   Date       Conversion    be acquired if the instrument is   voting
instrument             Period/ Date  exercised/ converted.              rights

N/A         N/A        N/A           N/A                                N/A


Total (A+B)
Number of voting rights                  % of voting rights

10,450,300                               4.996%


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


Ameriprise Financial, Inc., which controls the voting rights of Threadneedle
Asset Management Holdings Ltd, which controls the voting rights of Threadneedle
Asset Management Ltd, Threadneedle International Ltd and Threadneedle Pensions
Ltd.


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:


Registered Owner

Williams & Glyn (Isle of Man) Nominees Ltd    A/c 301780                62,500
Littledown Nominees Ltd                       A/c 3449                 640,000
Littledown Nominees Ltd                       A/c 27642                285,571
Littledown Nominees Ltd                       A/c 35822                 16,200
Littledown Nominees Ltd                       A/c 11121                 11,400
Littledown Nominees Ltd                       A/c 10479                  6,800
Littledown Nominees Ltd                       A/c 07205                341,262
Littledown Nominees Ltd                       A/c 21688                133,543
Littledown Nominees Ltd                       A/c 07207                369,999
Littledown Nominees Ltd                       A/c 07196                 34,000
Littledown Nominees Ltd                       A/c 07199                 29,042
Roy Nominees                                  A/c 104450               102,226
Mellon Nominees (UK) Ltd                      A/c WWSF00040002         290,079
Bank of Ireland Nominees                      A/c 4270483              319,071
Bank of Ireland Nominees                      A/c 4239914              202,681
Littledown Nominees Ltd                       A/c 18667                128,000
Littledown Nominees Ltd                       A/c 10469                197,000
Littledown Nominees Ltd                       A/c 39364                167,222
Littledown Nominees Ltd                       A/c 10496                772,989
Littledown Nominees Ltd                       A/c 10493                450,000
Littledown Nominees Ltd                       A/c 10491                666,614
Littledown Nominees Ltd                       A/c 10488              2,773,068
Littledown Nominees Ltd                       A/c 10495              1,350,000
Littledown Nominees Ltd                       A/c 31348                 45,000
Littledown Nominees Ltd                       A/c 02642                964,210
BNY (OSC) Nominees Ltd                        A/c 219064                91,823



14. Contact name:

Company Secretary, Threadneedle Group


15. Contact telephone number:

0207 464 5000




                      This information is provided by RNS
            The company news service from the London Stock Exchange