Weir Regulatory News (WEIR)

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

+----------------------------------------------+-------------------------------+
|1. Identity of the issuer or the underlying | |
|issuer | Weir Group PLC |
|of existing shares to which voting rights 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 to | |
|the |Capital Research and Management Company|
|notification obligation: | |
+--------------------------------------+---------------------------------------+
|4. Full name of shareholder(s) |   |
|(if different from 3.): | |
+--------------------------------------+---------------------------------------+
|5. Date of the transaction and date on| |
|which the threshold is crossed or | 16 April 2012 |
|reached: | |
+--------------------------------------+---------------------------------------+
|6. Date on which issuer notified: | 17 April 2012 |
+--------------------------------------+---------------------------------------+
|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 |Shares |Voting +------+----------+------+----------+------+--------+
|CODE | |Rights |Direct|Indirect |Direct|Indirect |Direct|Indirect|
+-----------+----------+-----------+------+----------+------+----------+------+--------+
|Ordinary | | | | | | | | |
|Shares |10,467,870|10,467,870 |N/A |10,639,000|N/A |10,639,000|N/A |5.0091% |
|(ISIN: | | | | | | | | |
|GB00094658)| | | | | | | | |
+-----------+----------+-----------+------+----------+------+----------+------+--------+

+--------------------------------------------------------------------------------------+
|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 |% of voting rights |
|financial |price |date |Conversion|voting rights |  |
|instrument | | |period |instrument | |
| | | | |refers to | |
| | | | |  | |
+------------+---------+----------+----------+---------------+-----------------+-------+
| | | | | |Nominal |Delta |
|  |  |  |  |  +-----------------+-------+
| | | | | |  |  |
+------------+---------+----------+----------+---------------+-----------------+-------+

+--------------------------------------------------------------------------------------+
|Total (A+B+C) |
+-----------------------------------+--------------------------------------------------+
|Number of voting rights |Percentage of voting rights |
+-----------------------------------+--------------------------------------------------+
|10,639,000 |5.0091% |
+-----------------------------------+--------------------------------------------------+

+--------------------------------------------------------------------------+
|9. Chain of controlled undertakings through which the voting rights and/or|
|the |
|financial instruments are effectively held, if applicable: |
+--------------------------------------------------------------------------+
|  |
|Capital Research and Management Company 10,639,000 - 5.009% |
+--------------------------------------------------------------------------+

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

+-----------------------------+--------------------------------------------+
| |Capital Research and Management Company |
|13. Additional information: | |
+-----------------------------+--------------------------------------------+
|14. Contact name: |Christopher Aquino |
+-----------------------------+--------------------------------------------+
|15. Contact telephone number:|(213) 486 9200 |
+-----------------------------+--------------------------------------------+



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Source: The Weir Group PLC via Thomson Reuters ONE
[HUG#1604634]