The Weir Group PLC : Holding(s) in Company

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

+----------------------------------------------+-------------------------------+
|1. Identity of the issuer or the underlying   |                               |
|issuer                                        |        Weir Group Plc         |
|of existing shares to which voting rights are |                               |
|attached:(ii)                                 |                               |
+----------------------------------------------+-------------------------------+
|2 Reason for the notification (please tick the appropriate box or boxes):     |
+---------------------------------------------------------------------+--------+
|An acquisition or disposal of voting rights                          |   X    |
+---------------------------------------------------------------------+--------+
|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                                   |   Prudential plc group of companies   |
|notification obligation:(iii)         |                                       |
+--------------------------------------+---------------------------------------+
|4. Full name of shareholder(s)        |         See attached schedule         |
|(if different from 3.):(iv)           |                                       |
+--------------------------------------+---------------------------------------+
|5. Date of the transaction and date on|                                       |
|which the threshold is crossed or     |            20 October 2011            |
|reached:(v)                           |                                       |
+--------------------------------------+---------------------------------------+
|6. Date on which issuer notified:     |            21 October 2011            |
+--------------------------------------+---------------------------------------+
|7. Threshold(s) that is/are crossed or|                  5%                   |
|reached:(vi, vii)                     |                                       |
+--------------------------------------+---------------------------------------+

+----------------------------------------------------------------------------------------+
|8. Notified details:                                                                    |
+----------------------------------------------------------------------------------------+
|A: Voting rights attached to shares(viii, ix)                                           |
+------------+---------------------+-----------------------------------------------------+
|Class/type  |Situation previous   |Resulting situation after the triggering transaction |
|of          |to the triggering    |                                                     |
|shares      |transaction          |                                                     |
|            +---------+-----------+------------+------------------------+---------------+
|if possible |Number   |Number     |Number      |Number of voting        |% of  voting   |
|using       |of       |of         |of shares   |rights                  |rights(x)      |
|the ISIN    |  ares   |Vo ing     +------------+----------+-------------+------+--------+
|CODE        |         |Rights     |Direct      |Direct(xi)|Indirect(xii)|Direct|Indirect|
+------------+---------+-----------+------------+----------+-------------+------+--------+
|GB0009465807|Below 5% | Below 5%  | 10,587,308 |10,587,308|             |5.00% |        |
+------------+---------+-----------+------------+----------+-------------+------+--------+
|            |         |           |            |          |             |      |        |
+------------+---------+-----------+------------+----------+-------------+------+--------+

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

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

+----------------------------------------------------------------------------------------+
|Total (A+B+C)                                                                           |
+-----------------------------------+----------------------------------------------------+
|Number of voting rights            |Percentage of voting rights                         |
+-----------------------------------+----------------------------------------------------+
|10,587,308                         |5.00%                                               |
+-----------------------------------+----------------------------------------------------+

+------------------------------------------------------------------------------+
|9. Chain of controlled undertakings through which the voting rights and/or the|
|financial instruments are effectively held, if applicable:(xxi)               |
+------------------------------------------------------------------------------+
|                                                                              |
|Prudential plc (parent Company)                                               |
|M&G Group Limited (wholly owned subsidiary of Prudential plc)                 |
|M&G Limited (wholly owned subsidiary of M&G Group Limited)                    |
|The Prudential Assurance Company Limited (wholly owned subsidiary of          |
|Prudential plc)                                                               |
|                                                                              |
+------------------------------------------------------------------------------+

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

+-----------------------------+------------------------------------------------+
|                             |                                                |
|13. Additional information:  |                                                |
+-----------------------------+------------------------------------------------+
|14. Contact name:            |James Todd / Mark Thomas                        |
|                             |M&G Investment Management Limited               |
+-----------------------------+------------------------------------------------+
|15. Contact telephone number:|020 7548 2293 / 020 7548 3266                   |
+-----------------------------+------------------------------------------------+




+------------------------------------+------------+-----------------+
| PRUDENTIAL PLC                     |            |                 |
+------------------------------------+------------+-----------------+
| Registered Holder                  |  Holding   | % Voting Rights |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMB7 |   4,144    |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMBJ |   8,371    |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMIN |  750,000   |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMIF |   47,543   |                 |
+------------------------------------+------------+-----------------+
| PRUCLT HSBC GIS NOM(UK) PAC AC     | 9,636,699  |                 |
+------------------------------------+------------+-----------------+
| PRUCLT HSBC GIS NOM(UK) PPL AC     |  140,551   |                 |
+------------------------------------+------------+-----------------+
| Total                              | 10,587,308 |      5.00       |
+------------------------------------+------------+-----------------+
|                                    |            |                 |
+------------------------------------+------------+-----------------+
| M&G GROUP LIMITED                  |            |                 |
+------------------------------------+------------+-----------------+
| Registered Holder                  |  Holding   | % Voting Rights |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMB7 |   4,144    |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMBJ |   8,371    |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMIN |  750,000   |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMIF |   47,543   |                 |
+------------------------------------+------------+-----------------+
| PRUCLT HSBC GIS NOM(UK) PAC AC     | 9,636,699  |                 |
+------------------------------------+            +-----------------+
| PRUCLT HSBC GIS NOM(UK) PPL AC        140,551                     |
+------------------------------------+------------+-----------------+
| Total                              | 10,587,308 |      5.00       |
+------------------------------------+------------+-----------------+
|                                    |            |                 |
+------------------------------------+------------+-----------------+
| M&G LIMITED                        |            |                 |
+------------------------------------+------------+-----------------+
| Registered Holder                  |  Holding   | % Voting Rights |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMB7 |   4,144    |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMBJ |   8,371    |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMIN |  750,000   |                 |
+------------------------------------+------------+-----------------+
| STATE STREET NOMINEES LTD A/C GMIF |   47,543   |                 |
+------------------------------------+------------+-----------------+
| PRUCLT HSBC GIS NOM(UK) PAC AC     | 9,636,699  |                 |
+------------------------------------+            +-----------------+
| PRUCLT HSBC GIS NOM(UK) PPL AC        140,551                     |
+------------------------------------+------------+-----------------+
| Total                              | 10,587,308 |      5.00       |
+------------------------------------+------------+-----------------+
|                                    |            |                 |
+------------------------------------+------------+-----------------+
| THE PRUDENTIAL ASSURANCE COMPANY LIMITED        |                 |
+------------------------------------+------------+-----------------+
| Registered Holder                  |  Holding   | % Voting Rights |
+------------------------------------+------------+-----------------+
| PRUCLT HSBC GIS NOM(UK) PAC AC     | 9,636,699  |                 |
+------------------------------------+            +-----------------+
| PRUCLT HSBC GIS NOM(UK) PPL AC        140,551                     |
+------------------------------------+------------+-----------------+
| Total                              | 9,777,250  |      4.62       |
+------------------------------------+------------+-----------------+
|                                    |            |                 |
+------------------------------------+------------+-----------------+



 Percentage holdings are calculated using 211,341,566 Total Voting Rights










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Source: The Weir Group PLC via Thomson Reuters ONE

[HUG#1557073]