Weir Regulatory News (WEIR)

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|TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES |
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+---------------------------------------------+--------------------------------+
|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 |   |
+---------------------------------------------------------------------+--------+
|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: | |
+-------------------------------------+----------------------------------------+
|4. Full name of shareholder(s) |   |
|(if different from 3.): | |
+-------------------------------------+----------------------------------------+
|5. Date of the transaction and date | |
|on | 27(th) July 2012 |
|which the threshold is crossed or | |
|reached: | |
+-------------------------------------+----------------------------------------+
|6. Date on which issuer notified: | 31(st) July 2012 |
+-------------------------------------+----------------------------------------+
|7. Threshold(s) that is/are crossed | |
|or | Holding has gone below 5% |
|reached: | |
+-------------------------------------+----------------------------------------+

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|8. Notified details: |
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|A: Voting rights attached to shares |
+-------------+----------------------+-----------------------------------------+
|Class/type of|Situation previous |Resulting situation after the triggering |
|shares |to the triggering |transaction |
| |transaction | |
|if possible +----------+-----------+---------+---------------+---------------+
|using |Number |Number |Number |Number of |% of  voting |
|the ISIN CODE|of |of |of shares|voting |rights |
| |Shares |Voting | |rights | |
| | |Rights +---------+------+--------+------+--------+
| | | |Direct |Direct|Indirect|Direct|Indirect|
+-------------+----------+-----------+---------+------+--------+------+--------+
|GB0009465807 |10,489,981|10,489,981 |N/A |N/A |below 5%|N/A |below 5%|
+-------------+----------+-----------+---------+------+--------+------+--------+

+------------------------------------------------------------------------------+
|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 |rights |
|instrument | | |be | |
| | | |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 |rights |
|instrument | | |period |instrument |  |
| | | | |refers to | |
| | | | |  | |
+--------------+---------+----------+----------+----------------+-------+------+
| | | | | |Nominal|Delta |
|CFD |  |  |  |below 5% +-------+------+
| | | | | |below |below |
| | | | | |5% |5% |
+--------------+---------+----------+----------+----------------+-------+------+

+------------------------------------------------------------------------------+
|Total (A+B+C) |
+-------------------------------------+----------------------------------------+
|Number of voting rights |Percentage of voting rights |
+-------------------------------------+----------------------------------------+
|N/A |below 5% |
+-------------------------------------+----------------------------------------+

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|9. Chain of controlled undertakings through which the voting rights and/or |
|the |
|financial instruments are effectively held, if applicable: |
+----------------------------------------------------------------------------+
|  |
|BlackRock Investment Management (UK) Limited - below 5% |
+----------------------------------------------------------------------------+

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|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: |William Graham |
+-----------------------------+----------------------------------------------+
|15. Contact telephone number:|020 7743 1459 |
+-----------------------------+----------------------------------------------+

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Source: The Weir Group PLC via Thomson Reuters ONE
[HUG#1631051]