Holding(s) in Company

+------------------------------------------------------------------------------+
|TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES                                |
+------------------------------------------------------------------------------+

+-------------------------------------------+----------------------------------+
|1. Identity of the issuer or the underlying|                                  |
|issuer                                     |                                  |
|of existing shares to which voting rights  |          Weir Group PLC          |
|are                                        |                                  |
|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  |AXA S.A., 25 Avenue Matignon, 75008 Paris |
|to the                             |                 and its                  |
|notification obligation:           |              group of companies.         |
+-----------------------------------+------------------------------------------+
|4. Full name of shareholder(s)     |                                          |
|(if different from 3.):            |                                          |
+-----------------------------------+------------------------------------------+
|5. Date of the transaction and date|                                          |
|on                                 |                        15 September 2011 |
|which the threshold is crossed or  |                                          |
|reached:                           |                                          |
+-----------------------------------+------------------------------------------+
|6. Date on which issuer notified:  |                       16 September 2011  |
|                                   |                                          |
+-----------------------------------+------------------------------------------+
|7. Threshold(s) that is/are crossed|                                          |
|or                                 |     5%                                   |
|reached:                           |                                          |
+-----------------------------------+------------------------------------------+

+------------------------------------------------------------------------------+
|8. Notified details:                                                          |
+------------------------------------------------------------------------------+
|A: Voting rights attached to shares                                           |
+-----------+----------------------+-------------------------------------------+
|Class/type |Situation previous    |Resulting situation after the triggering   |
|of         |to the triggering     |transaction                                |
|shares     |transaction           |                                           |
|           +----------+-----------+---------+-----------------+---------------+
|if possible|Number    |Number     |Number   |Number of voting |% of  voting   |
|using      |of        |of         |of shares|rights           |rights         |
|the ISIN   |  ares    |V ting     +---------+------+----------+------+--------+
|CODE       |          |Rights     |Direct   |Direct|Indirect  |Direct|Indirect|
+-----------+----------+-----------+---------+------+----------+------+--------+
|GB000946580|10,619,286|10,619,286 |1,200    |1,200 |10,476,426|0.00  |4.96%   |
+-----------+----------+-----------+---------+------+----------+------+--------+

+------------------------------------------------------------------------------+
|B: Qualifying Financial Instruments                                           |
+------------------------------------------------------------------------------+
|Resulting situation after the triggering transaction                          |
+-------------+----------+--------------------+------------------+-------------+
|Type of      |Expiration|Exercise/           |Number of voting  |% of voting  |
|financial    |date      |Conversion Period   |rights that may be|rights       |
|instrument   |          |                    |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 voting  |% of voting   |
|financial   |price    |date      |Conversion|rights instrument |rights        |
|instrument  |         |          |period    |refers to         |              |
|            |         |          |          |                  |              |
+------------+---------+----------+----------+------------------+-------+------+
|            |         |          |          |                  |Nominal|Delta |
|            |         |          |          |                  +-------+------+
|            |         |          |          |                  |       |      |
+------------+---------+----------+----------+------------------+-------+------+

+------------------------------------------------------------------------------+
|Total (A+B+C)                                                                 |
+-----------------------------------+------------------------------------------+
|Number of voting rights            |Percentage of voting rights               |
+-----------------------------------+------------------------------------------+
|10,477,626                         |4.96%                                     |
+-----------------------------------+------------------------------------------+

+------------------------------------------------------------------------------+
|9. Chain of controlled undertakings through which the voting rights and/or the|
|financial instruments are effectively held, if applicable:                    |
+------------------------------------------------------------------------------+
|                                                                              |
|Name of the Company/Fund                   Number of Shares           % of    |
|issued capital                                                                |
|                                                                              |
| AXA Colona Konzen    1,200.00       0.000568                                 |
| Direct                                                                       |
|                                                                              |
|                                                                              |
| AXA Financial, Inc   17,835.00      0.008439                                 |
| Indirect                                                                     |
|                                                                              |
|                                                                              |
| AXA IM Paris         890,486.00     0.421360                                 |
| Indirect                                                                     |
|                                                                              |
|                                                                              |
| AXA IM UK            9,566,305.00   4.526583                                 |
| Indirect                                                                     |
|                                                                              |
|                                                                              |
| AXA Rosenberg        1,800.00       0.000852                                 |
| Indirect                                                                     |
|                                                                              |
|                                                                              |
|                                                                              |
|                                                                              |
| Total Direct         1,200          0.00057                                  |
|                                                                              |
|                                                                              |
| Total Indirect       10,476,426     4.95723                                  |
|                                                                              |
|                                                                              |
| TOTAL                10,477,626     4.95780                                  |
|                                                                              |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Proxy Voting:                                                                 |
+--------------------------------------------+---------------------------------+
|10. Name of the proxy holder:               |                                 |
+--------------------------------------------+---------------------------------+
|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:           |Dimitrios Tsamis                                 |
+----------------------------+-------------------------------------------------+
|15. Contact telephone       |020 7003 2806                                    |
|number:                     |                                                 |
+----------------------------+-------------------------------------------------+







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Source: The Weir Group PLC via Thomson Reuters ONE

[HUG#1548732]