Holding(s) in Company

Weir Group PLC
16 March 2006


                               The Weir Group PLC
                                                                   16 March 2006

The Weir Group PLC (the 'Company') received notice from Threadneedle Asset
Management Holdings Limited on 15 March 2006 that, for the purposes of Section
198 of the Companies Act 1985, Ameriprise Financial, Inc hold the following
notifiable interest in the Ordinary shares of the Company.

Registered Owner                                         Ordinary 12.5p shares
------------------                                       -----------------------

Bank of Ireland Nominees                A/c 4261416                    217,036
Bank of Ireland Nominees                A/c 4239914                    319,832
BNY (OCS) Nominees Ltd                  A/c 219064                     209,152
Littledown Nominees Ltd                 A/c 11121                       14,000
Littledown Nominees Ltd                 A/c 10479                        9,000
Littledown Nominees Ltd                 A/c 07197                      224,075
Littledown Nominees Ltd                 A/c 07203                       84,928
Littledown Nominees Ltd                 A/c 21667                       73,196
Littledown Nominees Ltd                 A/c 34789                      173,858
Littledown Nominees Ltd                 A/c 07207                      400,969
Littledown Nominees Ltd                 A/c 07196                       59,341
Littledown Nominees Ltd                 A/c 27642                      385,142
Littledown Nominees Ltd                 A/c 05576                    1,259,834
Littledown Nominees Ltd                 A/c 35822                       21,000
Littledown Nominees Ltd                 A/c 03449                    1,410,402
Littledown Nominees Ltd                 A/c 18667                      360,000
Littledown Nominees Ltd                 A/c 10469                      520,370
Littledown Nominees Ltd                 A/c 10496                    1,460,864
Littledown Nominees Ltd                 A/c 10492                      918,796
Littledown Nominees Ltd                 A/c 10491                    3,060,932
Littledown Nominees Ltd                 A/c 10488                    3,090,680
Littledown Nominees Ltd                 A/c 10495                    3,290,000
Littledown Nominees Ltd                 A/c 10489                      627,588
Littledown Nominees Ltd                 A/c 10490                      305,341
Littledown Nominees Ltd                 A/c 31348                       65,000
Littledown Nominees Ltd                 A/c 02642                      556,139
Littledown Nominees Ltd                 A/c 05577                       82,655
Mellon Nominees (UK) Ltd                A/c WWSF0004002                452,079
Mellon Nominees (UK) Ltd                A/c AVOF0003002                886,742
Morgan Stanley Nominees Limited         A/c 04F607404                  217,000
Roy Nominees                            A/c 104450                     133,623
State Street Nominees Limited           A/c JY17                     1,502,016
State Street Nominees Limited           A/c JTAV                       124,598
William & Glyns (Isle of Man) Nominees  A/c 301780                     125,000
Ltd

                                TOTAL                               22,641,188





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