1.

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

CELOXICA HOLDINGS 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 (specify):

Final Deadline re DTR5

( X)

3.

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

Herald Investment Management Limited

4.

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

Not needed

5.

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

N/a see other above

6.

Date on which issuer notified:

20th March 2007

7.

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

7%

8.

Notified details:

Class/type of shares (if possible using the ISIN code)

Ordinary (GB00B0L9TZ33)

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

5,137,500 (7%)

5,137,500 (7%)

5,137,500

7%

Type of financial instrument

Expiration date

Exercise/Conversion Period/Date

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

% of voting rights

Number of voting rights

% of voting rights

5,137,500

7%

9.

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

Herald Investment Management Limited, a discretionary investment manager, is the parent undertaking of an investment business.

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:

14:

Contact name:

Andrew Miller

15.

Contact telephone number:

020 7553 6308

Full name (including legal form for legal entities):

Herald Investment Management Limited

Contact address (registered office for legal entities)

10/11 Charterhouse Square

LONDON EC1M 6EE

Phone number

020 7553 6308

Other useful information (at least legal representative for legal persons):

Andrew Miller

Full name:

See above

Contact address:

Phone number:

Other useful information (at least legal relationship with the person or legal entity subject to the notification obligation):