The Weir Group PLC : Holding(s) in Company

For filings with the FSA include the
 annex

 For filings with issuer exclude the
 annex


+------------------------------------------------------------------------------+
|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                           |       |
+----------------------------------------------------------------------+-------+
|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                                   |            BlackRock, Inc.            |
|notification obligation:(iii)         |                                       |
+--------------------------------------+---------------------------------------+
|4. Full name of shareholder(s)        |                                       |
|(if different from 3.):(iv)           |                                       |
+--------------------------------------+---------------------------------------+
|5. Date of the transaction and date on|                                       |
|which the threshold is crossed or     |          6(th) October 2011           |
|reached:(v)                           |                                       |
+--------------------------------------+---------------------------------------+
|6. Date on which issuer notified:     |          10(th) October 2011          |
+--------------------------------------+---------------------------------------+
|7. Threshold(s) that is/are crossed or|       Holding has gone above 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|9,892,588|9,892,588  |N/A         |N/A       |10,324,041   |N/A   |4.89%   |
+------------+---------+-----------+------------+----------+-------------+------+--------+

+----------------------------------------------------------------------------------------+
|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 |
|CFD          |        |          |             |528,095                  +-------+------+
|             |        |          |             |                         |0.25%  |0.25% |
+-------------+--------+----------+-------------+-------------------------+-------+------+

+----------------------------------------------------------------------------------------+
|Total (A+B+C)                                                                           |
+-----------------------------------+----------------------------------------------------+
|Number of voting rights            |Percentage of voting rights                         |
+-----------------------------------+----------------------------------------------------+
|10,852,136                         |5.14%                                               |
+-----------------------------------+----------------------------------------------------+

+----------------------------------------------------------------------------+
|9. Chain of controlled undertakings through which the voting rights and/or  |
|the                                                                         |
|financial instruments are effectively held, if applicable:(xxi)             |
+----------------------------------------------------------------------------+
|                                                                            |
|BlackRock Investment Management (UK) Limited - 10,852,136 (5.14%)           |
+----------------------------------------------------------------------------+

+----------------------------------------------------------------------------+
|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:                                   |                          |
+-------------------------------------------------+--------------------------+

+-----------------------------+----------------------------------------------+
|                             |BlackRock International Threshold Reporting   |
|13. Additional information:  |Team                                          |
+-----------------------------+----------------------------------------------+
|14. Contact name:            |Andrew Manchester                             |
+-----------------------------+----------------------------------------------+
|15. Contact telephone number:|020 7743 5773                                 |
+-----------------------------+----------------------------------------------+

 Note: Annex should only be submitted to the FSA not the issuer

 Annex: Notification of major interests in shares(xxii)


+------------------------------------------------------------------------------+
|A: Identity of the persons or legal entity subject to the notification        |
|obligation                                                                    |
+-------------------------------+----------------------------------------------+
|Full name                      |                                              |
|(including legal form of legal |BlackRock, Inc.                               |
|entities)                      |                                              |
|                               |                                              |
+-------------------------------+----------------------------------------------+
|Contact address                |                                              |
|(registered office for legal   |12 Throgmorton Avenue, London, EC2N 2DL       |
|entities)                      |                                              |
|                               |                                              |
+-------------------------------+----------------------------------------------+
|Phone number & email           |020 7743 5773; [e-mail]|
|                               |                                              |
+-------------------------------+----------------------------------------------+
|Other useful information       |                                              |
|(at least legal representative |Andrew Manchester                             |
|for legal persons)             |                                              |
|                               |                                              |
+-------------------------------+----------------------------------------------+

+------------------------------------------------------------------------------+
|B: Identity of the notifier, if applicable                                    |
+-------------------------------+----------------------------------------------+
|Full name                      |                                              |
|                               |                                              |
+-------------------------------+----------------------------------------------+
|Contact address                |                                              |
|                               |                                              |
+-------------------------------+----------------------------------------------+
|Phone number & email           |                                              |
|                               |                                              |
+-------------------------------+----------------------------------------------+
|Other useful information       |                                              |
|(e.g. functional relationship  |                                              |
|with the person or legal entity|                                              |
|subject to the notification    |                                              |
|obligation)                    |                                              |
+-------------------------------+----------------------------------------------+

+------------------------------------------------------------------------------+
|C: Additional information                                                     |
+------------------------------------------------------------------------------+
|                                                                              |
+------------------------------------------------------------------------------+
 For notes on how to complete form TR-1 please see the FSA website.








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Source: The Weir Group PLC via Thomson Reuters ONE

[HUG#1562890]