Holding(s) in Company

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

Gresham Computing 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 (iii):

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY FOR ITS GENERAL ACCOUNT NORTHWESTERN MUTUAL SERIES FUND INC - ASSET ALLOCATION FUND NORTHWESTERN MUTUAL SERIES FUND INC - BALANCED FUND NORTHWESTERN MUTUAL SERIES FUND INC - INTERNATIONAL GROWTH FUND MASON STREET ADVISORS LLC

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

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY FOR ITS GENERAL ACCOUNT NORTHWESTERN MUTUAL SERIES FUND INC - ASSET ALLOCATION FUND NORTHWESTERN MUTUAL SERIES FUND INC - BALANCED FUND NORTHWESTERN MUTUAL SERIES FUND INC - INTERNATIONAL GROWTH FUND

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

11 March 2009 

6. Date on which issuer notified:

13 March 2009

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

3%

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 (vi)

GB0008808825

Number of shares1,589,333

Number of voting Rights (viii)1,589,333

Resulting situation after the triggering transaction (vii)

Class/type of shares if possible  using the ISIN CODE

Number of shares 

Number of voting rights (ix)

% of voting rights

GB0008808825

Direct1,406,833

Direct (x)1,406,833

Indirect (xi)

Direct2.66%

Indirect

B: Financial Instruments

Resulting situation after the triggering transaction (xii)

Type of financial instrument

Expiration Date (xiii)

Exercise/Conversion Period/ Date (xiv)N/A

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

% of voting rights

Total (A+B)

Number of voting rights1,406,833

% of voting rights2.66%

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable (xv):MASON STREET ADVISORS LLC, A LIMITED LIABILITY COMPANY ORGANIZED UNDER THE LAWS OF DELAWARE, IS A REGISTERED INVESTMENT ADVISER UNDER THE INVESTMENT COMPANY ACT 1940 AND IS A WHOLLY OWNED SUBSIDIARY OF THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY. MASON STREET ADVISORS LLC HAS ENTERED INTO INVESTMENT ADVISORY AGREEMENTS WITH THE SHAREHOLDERS LISTED BELOW, PURSUANT TO WHICH IT VOTES (OR INSTRUCTS THE CUSTODIAN HOW TO VOTE) THE SHARES OF THE ISSUER.

THE SHAREHOLDERS AND THE NUMBER OF SHARES OF THE ISSUER HELD BY EACH, RESPECTIVELY, AFTER GIVING EFFECT TO THE TRIGGERING TRANSACTION, ARE:

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY FOR ITS GENERAL ACCOUNT: 1,019,321

NORTHWESTERN MUTUAL SERIES FUND INC - ASSET ALLOCATION FUND: 30,300

NORTHWESTERN MUTUAL SERIES FUND INC - BALANCED FUND: 168,262

NORTHWESTERN MUTUAL SERIES FUND INC - INTERNATIONAL GROWTH FUND: 188,950

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:

Chris Errington 

15. Contact telephone number:

01489 555500