INVESTOR RELATIONS

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. Ltd
Arron Banks
Paul Chase-Gardner
Rock Holdings Ltd

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

STM Fidecs Nominees Ltd
Rene Nominees Ltd
Barclays Stock Brokers Ltd
Rock 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:

Class/type of shares if possible using the ISIN CODE	Situation previous to the Triggering transaction
	Number of shares	Number of voting Rights
IM00B1S9KY98 Ord 0.1p	5,229,606	12.25%

Resulting situation after the triggering transaction (vii)

Class/type of shares if possible using the ISIN CODE	Number of shares	Number of voting rights		% of voting rights
	Direct	Direct	Indirect	Direct	Indirect
IM00B1S9KY98 Ord 0.1p			5,732,263		13.32%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument	Expiration Date	Exercise/Conversion Period	Number of voting rights that may be acquired if the instrument is exercised/ converted.	% of voting rights
n/a	n/a	n/a	n/a	n/a

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

Resulting situation after the triggering transaction

Type of financial instrument	Exercise price	Expiration date	Exercise/Conversion Period	Number of voting rights instrument refers to	% of voting rights
					Nominal	Delta
n/a	n/a	n/a	n/a	n/a	n/a	n/a

Total (A+B+C)

Number of voting rights	% of voting rights
5,732,263	13.32%

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