Stm Grp. Regulatory News (STM)

TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

STM Group plc

2. Reason for the notification (please state Yes/No): ( )

An acquisition or disposal of voting rights: ( Yes )

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: ( )

Other (please specify): ( )

3. Full name of person(s) subject to the notification obligation:

Southern Rock Insurance Co. LtdArron BanksPaul Chase-GardnerRock Holdings Ltd

4. Full name of shareholder(s) (if different from 3.):

STM Fidecs Nominees LtdRene Nominees LtdBarclays Stock Brokers LtdRock Nominees Ltd

5. Date of the transaction (and date on which the threshold is crossed or reached if different):

30/06/2011

6. Date on which issuer notified:

30/08/2011

7. Threshold(s) that is/are crossed or reached:

13%

8. Notified details:

A: Voting rights attached to shares:

Resulting situation after the triggering transaction (vii)

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Total (A+B+C)

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

Rene Nominees Ltd (Southern Rock Insurance Company Ltd) 3,870,000 Shares 8.99%

Rene Nominees Ltd (Rock Holdings Ltd) 290,000 Shares 0.67%

Rene Nominees Ltd (Arron Banks) 752,138 Shares 1.75%

Barclays Stockbrokers Ltd (Paul Chase-Gardener) 138,109 Shares 0.32%

Rock Nominees Ltd (Paul Chase-Gardener) 394,500 Shares 0.92%

STM Fidecs Nominees Ltd (Paul Chase-Gardener) 287,516 Shares 0.67%

Both Arron Banks and Paul Chase-Gardener are connected to Southern Rock Insurance Company Ltd and Rock Holdings Ltd, being major shareholders in Rock Holdings Ltd. Rock Holdings Ltd is a major shareholder in Southern Rock Insurance Company Ltd.

Therefore, together, Southern Rock Insurance Company, Rock Holdings Ltd., Arron Banks and Paul Chase-Gardener are interested in 5,732,263 shares in STM Group Plc, representing approximately 13.32% of the Company's issued share capital. Based on company share issue of 43,026,602.

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 rights:

n/a

13. Additional information:

n/a

14. Contact name:

Andrea Falcon

15. Contact number:

+44 (0) 1454 634 853