Microsaic Regulatory News (MSYS)

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached: ii

Microsaic Systems plc

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

An acquisition or disposal of voting rights

P

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

P

Other (please specify):

3. Full name of person(s) subject to thenotification obligation: iii

Herald Investment Management Limited

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

Discretionary investment management clients of Herald Investment Management Limited

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

On admission of 9,951,443 new ordinary shares to trading on AIM on 28th May, 2013

6. Date on which issuer notified:

10th May, 2013

7. Threshold(s) that is/are crossed orreached: vi, vii

5%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Indirect

Direct xi

Indirect xii

Direct

Indirect

GB00B547ZY09

1,350,000

1,350,000

2,745,348

2,745,348

5.23%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

None

Nil

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date xvii

Exercise/Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

None

Nominal

Delta

Nil

Total (A+B+C)

Number of voting rights

Percentage of voting rights

2,745,348

5.23%

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

N/A

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will ceaseto hold:

N/A

12. Date on which proxy holder will cease to holdvoting rights:

N/A

13. Additional information:

14. Contact name:

Andrew Miller CFO

15. Contact telephone number:

020 7553 6308