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     |           01 December 2011            |
|reached:(v)                           |                                       |
+--------------------------------------+---------------------------------------+
|6. Date on which issuer notified:     |           05 December 2011            |
+--------------------------------------+---------------------------------------+
|7. Threshold(s) that is/are crossed or|               Below 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    |V ting     +------------+----------+-------------+------+--------+
|CODE        |          |Rights     |Direct      |Direct(xi)|Indirect(xii)|Direct|Indirect|
+------------+----------+-----------+------------+----------+-------------+------+--------+
|GB0009465807|10,582,552|10,582,552 | 9,709,084  |9,709,084 |             |4.59% |        |
+------------+----------+-----------+------------+----------+-------------+------+--------+
|            |          |           |            |          |             |      |        |
+------------+----------+-----------+------------+----------+-------------+------+--------+

+-----------------------------------------------------------------------------------------+
|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                         |
+------------------------------------+----------------------------------------------------+
|9,709,084                           |4.59%                                               |
+------------------------------------+----------------------------------------------------+

+------------------------------------------------------------------------------+
|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)                                               |
|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:  |This disclosure now gives our position under    |
|                             |non-exempt rules where disclosure is required   |
|                             |from a 3% level as our exempt holdings have     |
|                             |dropped below 5%.                               |
|                             |                                                |
+-----------------------------+------------------------------------------------+
|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 |
+--------------------------------+-----------+-----------------+
| PRUCLT HSBC GIS NOM(UK) PAC AC | 9,572,889 |                 |
+--------------------------------+-----------+-----------------+
| PRUCLT HSBC GIS NOM(UK) PPL AC |  136,195  |                 |
+--------------------------------+-----------+-----------------+
| Total                          | 9,709,084 |      4.59       |
+--------------------------------+-----------+-----------------+
|                                |           |                 |
+--------------------------------+-----------+-----------------+
|                                |           |                 |
+--------------------------------+-----------+-----------------+
| THE PRUDENTIAL ASSURANCE COMPANY LIMITED   |                 |
+--------------------------------+-----------+-----------------+
| Registered Holder              |  Holding  | % Voting Rights |
+--------------------------------+-----------+-----------------+
| PRUCLT HSBC GIS NOM(UK) PAC AC | 9,572,889 |                 |
+--------------------------------+           +-----------------+
| PRUCLT HSBC GIS NOM(UK) PPL AC    136,195                    |
+--------------------------------+-----------+-----------------+
| Total                          | 9,709,084 |      4.59       |
+--------------------------------+-----------+-----------------+
|                                |           |                 |
+--------------------------------+-----------+-----------------+



 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#1569252]