Holding(s) in Company

Impax Group PLC
20 December 2007


TR-1:              NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing  Impax Group plc
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                                                     X
An acquisition or disposal of financial instruments which may result in the acquisition of
shares already issued to which voting rights are attached
An event changing the breakdown of voting rights
3. Full name of person(s) subject to the notification           Marshall Securities Limited
obligation:
4. Full name of shareholder(s) (if different from 3.):          Marshall Securities Limited
                                                                Pershing Securities Nominees Limited
                                                                MS Pension Plan
                                                                PMIB Employee Benefit Trust
5. Date of the transaction (and date on which the threshold is  19 December 2007
crossed or reached if different):
6. Date on which issuer notified:                               19 December 2007
7. Threshold(s) that is/are crossed or reached:                 3%
8. Notified details:


A: Voting rights attached to shares
Class/type of    Situation previous to Resulting situation after the triggering transaction
shares           the Triggering
                 transaction
 if possible     Number of  Number of  Number of    Number of voting rights   % of voting rights
using the ISIN   Shares     Voting     shares
CODE                        Rights     Direct       Direct       Indirect     Direct       Indirect
Ordinary shares  4,950,544  4,950,544  No           No           N/A          No           N/A
of 1 p each                            declarable   declarable                declarable
GB0004905260                           holding      holding                   holding


B: Financial Instruments
Resulting situation after the triggering transaction
Type of financial    Expiration date Exercise/ Conversion      Number of voting rights    % of voting
instrument                           Period/ Date              that may be acquired if    rights
                                                               the instrument is
                                                               exercised/ converted
N/A                  N/A             N/A                       N/A                        N/A


Total (A+B)
Number of voting rights                            % of voting rights
No declarable holding                              No declarable holding


9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively
held, if applicable:
N/A


Proxy Voting:
10. Name of the proxy holder:                                   N/A
11. Number of voting rights proxy holder will cease to hold:    N/A
12. Date on which proxy holder will cease to hold voting        N/A
rights:
13. Additional Information                      The above holdings include those of the MS Pension
                                                Plan and PMIB Employee Benefit Trust




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