Microsaic Regulatory News (MSYS)

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

Microsaic Systems plc

2. Reason for the notification  (please tick the appropriate box or boxes)

An acquisition or disposal of voting rights

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[iii]:

NIGEL WRAY

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

NIGEL WRAY

RBC Trustees (CI) LIMITED

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

N/A

6. Date on which issuer notified:

18th APRIL 2011

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

4%

8. Notified details:

AS ABOVE

A: Voting rights attached to shares

Class/type of shares

 if possible using the ISIN CODE

Situation previous to the Triggering transaction [vi]

Resulting situation after the triggering transaction[vii]

Number of Shares

Number of Voting Rights viii

Number of shares

Number of voting rights ix

% of voting rights

Direct

Direct x

Indirect xi

Direct

Indirect

GB00B547ZY09

1,803,800

1,803,800

1,208,720

595,080

3.22%

1.59%

B: Financial Instruments

Resulting situation after the triggering transaction xii

Type of financial instrument

Expiration date xiii

Exercise/ Conversion Period/ Date xiv

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

Total (A+B)

Number of voting rights

% of voting rights

1,803,800

4.81%

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

Nigel Wray has a beneficial interest in 1,208,720 shares in Mircosaic Systems plc

The family of Nigel Wray have a beneficial interest in shares in Microsaic Systems plc held by RBC Trustees (CI) Limited - 595,080

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:

Figures are based on total number of voting rights of 37,515,400

14. Contact name:

Nigel Wray

15. Contact telephone number:

020 7647 7657