Holding(s) in Company

Financial Services Authority

+------------------------------------------------------------------------------+
|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 |        Weir Group Plc         |
|attached:                                     |                               |
|                                              |                               |
+----------------------------------------------+-------------------------------+
|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  |   Legal & General Group Plc (Group)   |
|the                                   |                                       |
|notification obligation:              | Legal & General Investment Management |
|                                      |            Limited (LGIM)             |
+--------------------------------------+---------------------------------------+
|                                      |                                       |
|4. Full name of shareholder(s)        |    Legal & General Group Plc (L&G)    |
|(if different from 3.):               |                                       |
|                                      |                                       |
+--------------------------------------+---------------------------------------+
|                                      |                                       |
|5. Date of the transaction and date on|                                       |
|which the threshold is crossed or     |              20 May 2011              |
|reached:                              |                                       |
|                                      |                                       |
+--------------------------------------+---------------------------------------+
|6. Date on which issuer notified:     |              23 May 2011              |
+--------------------------------------+---------------------------------------+
|7. Threshold(s) that is/are crossed or|         Group LGIM (Above 5%)         |
|reached:                              |                                       |
|                                      |            LGIM (Above 5%)            |
+--------------------------------------+---------------------------------------+

+------------------------------------------------------------------------------+
|8. Notified details:                                                          |
|                                                                              |
+------------------------------------------------------------------------------+
|A: Voting rights attached to shares                                           |
+-----------+--------------+---------------------------------------------------+
|Class/type |  Situation   |     Resulting situation after the triggering      |
|of         |   previous   |                    transaction                    |
|shares     |    to the    |                                                   |
|           |  triggering  |                                                   |
|if possible| transaction  |                                                   |
|using      +------+-------+------------+----------------------+---------------+
|the ISIN   |Number|Number |            |   Number of voting   | % of  voting  |
|CODE       |  of  |  of   |   Number   |        rights        |    rights     |
|           |  ares|Vot ng | of sha  s  +-----------+----------+------+--------+
|           |      |Rights |            |  Direct   | Indirect |Direct|Indirect|
+-----------+------+-------+------------+-----------+----------+------+--------+
|           |   Below 5%   |            |           |          |      |        |
|Ordinary   |              | 10,582,148 | 8,870,969 | 1,711,179|4.197%| 0.809% |
|12.5p      |    As of     |            |           |          |      |        |
|           |  01/04/2011  |            |           |          |      |        |
+-----------+--------------+------------+-----------+----------+------+--------+

+------------------------------------------------------------------------------+
|B: Qualifying Financial Instruments                                           |
+------------------------------------------------------------------------------+
|Resulting situation after the triggering transaction                          |
+-------------+-----------+---------------------+---------------+--------------+
|             |           |                     |Number of      |              |
|Type of      |Expiration |Exercise/            |voting         |% of voting   |
|financial    |date       |Conversion Period    |rights that may|rights        |
|instrument   |           |                     |be             |              |
|             |           |                     |acquired if the|              |
|             |           |                     |instrument is  |              |
|             |           |                     |exercised/     |              |
|             |           |                     |converted.     |              |
+-------------+-----------+---------------------+---------------+--------------+
|             |           |                     |               |              |
+-------------+-----------+---------------------+---------------+--------------+

+------------------------------------------------------------------------------+
|C: Financial Instruments with similar economic effect to Qualifying Financial |
|Instruments                                                                   |
+------------------------------------------------------------------------------+
|Resulting situation after the triggering transaction                          |
+------------+---------+-----------+-----------+----------+--------------------+
|            |         |           |           |          |                    |
|Type      of|Exercise |Expiration |Exercise/  |Number  of|% of voting rights  |
|financial   |price    |date       |Conversion |voting    |                    |
|instrument  |         |           |period     |rights    |                    |
|            |         |           |           |instrument|                    |
|            |         |           |           |refers to |                    |
|            |         |           |           |          |                    |
+------------+---------+-----------+-----------+----------+------------+-------+
|            |         |           |           |          |  Nominal   | Delta |
|            |         |           |           |          +------------+-------+
|            |         |           |           |          |            |       |
+------------+---------+-----------+-----------+----------+------------+-------+

+------------------------------------------------------------------------------+
|Total (A+B+C)                                                                 |
+-----------------------------------+------------------------------------------+
|Number of voting rights            |Percentage of voting rights               |
+-----------------------------------+------------------------------------------+
|             10,582,148            |                  5.00%                   |
+-----------------------------------+------------------------------------------+

+------------------------------------------------------------------------------+
|9. Chain of controlled undertakings through which the voting rights and/or the|
|financial instruments are effectively held, if applicable:                    |
+------------------------------------------------------------------------------+
|                                                                              |
|Legal & General Group Plc (Direct and Indirect) (Group) (                     |
|10,582,148 -5.00% = Total Position)                                           |
|                                                                              |
|Legal & General Investment Management (Holdings) Limited                      |
|(LGIMH) (Direct and Indirect)  ( 10,582,148 -5.00% = Total                    |
|Position)                                                                     |
|                                                                              |
|Legal & General Investment Management Limited (Indirect) (LGIM)               |
|( 10,582,148 -5.00% = Total Position)                                         |
|                                                                              |
|  Legal & General Group Plc (Direct) (L&G) ( 8,870,969 -4.19% = LGAS, LGPL &  |
|                                     PMC)                                     |
|                                                                              |
|Legal & General Investment Management Legal & General Insurance Holdings      |
|(Holdings) Limited (Direct) (LGIMHD)  Limited (Direct) (LGIH)                 |
|(PMC)                                                                         |
|                                                                              |
|Legal & General Assurance (Pensions   Legal & General Assurance Society       |
|Management) Limited  (PMC) (PMC)      Limited  (LGAS & LGPL)                  |
|                                                                              |
|                                      Legal & General Pensions Limited        |
|                                      (Direct)  (LGPL)                        |
|                                                                              |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Proxy Voting:                                                                 |
+------------------------------------------------+-----------------------------+
|10. Name of the proxy holder:                   |             N/A             |
+------------------------------------------------+-----------------------------+
|11. Number of voting rights proxy holder will   |             N/A             |
|cease                                           |                             |
|to hold:                                        |                             |
+------------------------------------------------+-----------------------------+
|12. Date on which proxy holder will cease to    |             N/A             |
|hold                                            |                             |
|voting rights:                                  |                             |
+------------------------------------------------+-----------------------------+

+-----------------------------+------------------------------------------------+
|                             |   Notification using the total voting rights   |
|13. Additional information:  |             figure of  211,317,552             |
+-----------------------------+------------------------------------------------+
|14. Contact name:            |                Paul Toon (LGIM)                |
+-----------------------------+------------------------------------------------+
|15. Contact telephone number:|                 020 3124 3854                  |
+-----------------------------+------------------------------------------------+







This announcement is distributed by Thomson Reuters on behalf of 
Thomson Reuters clients. The owner of this announcement warrants that: 
(i) the releases contained herein are protected by copyright and 
    other applicable laws; and 
(ii) they are solely responsible for the content, accuracy and 
     originality of the information contained therein. 
    
Source: The Weir Group PLC via Thomson Reuters ONE

[HUG#1518048]