TR-1: Notification of Major Interests in Shares 

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

Wolfson Microelectronics plc

2. Reason for the notification  (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

No

An event changing the breakdown of voting rights

No

Other (please specify): ______________

No

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

Wellington Management Company, LLP

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

BBH ISL Nominees Ltd.

Goldman Sachs International

JP Morgan Chase Nominees Limited

Mellon Nominees (UK) Ltd.

National Nominees Limited

Nortrust Nominees Limited

ROY Nominees Limited

State Street Nominees Limited

Vidacos Nominees Limited

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

10 October 2008

6. Date on which issuer notified:

13 October 2008

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

10%

8. Notified Details

A: Voting rights attached to shares

Class/type of shares

If possible use ISIN CODE

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

Percentage of voting rights

Direct

Indirect

Direct

Indirect

GB00335631300 Ordinary Shares

12,795,056

12,795,056

11,289,533

11,289,533

9.73%

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date

No. of voting rights that may be acquired (if the instrument is exercised/converted)

Percentage of voting rights

Total (A+B)

Number of voting rights

Percentage of voting rights

11,289,533

9.73%

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

BH ISL Nominees Ltd. - 195,711 shares

Goldman Sachs International - 3,965,959 shares

JP Morgan Chase Nominees Limited - 1,120,298 shares

Mellon Nominees (UK) Ltd. - 1,957,104 shares

National Nominees Limited - 90,737 shares

Nortrust Nominees Limited - 103,675 shares

ROY Nominees Limited - 336,078 shares

State Street Nominees Limited - 3,254,927 shares

Vidacos Nominees Limited - 265,044 shares

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will cease to hold:

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

13. Additional information:

14. Contact name:

Robert J. Toner

15. Contact telephone number:

(617) 790-7084