Holding(s) in Company

RNS Number:5230D
Cambridge Antibody Tech Group PLC
24 May 2006

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company



CAMBRIDGE ANTIBODY TECHNOLOGY GROUP PLC



2. Name of shareholder having a major interest



CREDIT SUISSE



3. Please state whether notification indicates that it is in respect of holding
of the shareholder named in 2 above or in respect of a non-beneficial interest
or in the case of an individual holder if it is a holding of that person's
spouse or children under the age of 18



CREDIT SUISSE SECURITIES (EUROPE) LIMITED                              NOT KNOWN

CREDIT SUISSE INTERNATIONAL                                            NOT KNOWN



4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them



CREDIT SUISSE SECURITIES (EUROPE) LIMITED               2,735,281

CREDIT SUISSE INTERNATIONAL                                     9



5. Number of shares / amount of stock acquired



NOT DISCLOSED



6. Percentage of issued class



N/A



7. Number of shares / amount of stock disposed



N/A



8. Percentage of issued class



N/A



9. Class of security



ORDINARY 10 PENCE SHARES



10. Date of transaction



19 MAY 2006

11. Date company informed



24 MAY 2006



12. Total holding following this notification



2,735,290



13. Total percentage holding of issued class following this notification



5.14%



14. Any additional information



THOSE CREDIT SUISSE COMPANIES WHICH ARE DIRECT OR INDIRECT HOLDING COMPANIES OF
CREDIT SUISSE SECURITIES (EUROPE) LIMITED AND CREDIT SUISSE INTERNATIONAL ARE,
UNDER THE TERMS OF SECTION 203 OF THE ACT, EACH INTERESTED BY ATTRIBUTION IN ANY
SHARES  IN WHICH CREDIT SUISSE SECURITIES (EUROPE) LIMITED AND CREDIT SUISSE
INTERNATIONAL ARE INTERESTED.



15. Name of contact and telephone number for queries



JUSTIN HOSKINS 01223 898589



16. Name and signature of authorised company official responsible for making
this notification



JUSTIN HOSKINS, COMPANY SECRETARY



Date of notification



24 MAY 2006



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END

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