Rule 8.3- Cambridge Antibody

RNS Number:1501E
Credit Suisse Securities (Eur) Ltd
06 June 2006

                                                                        FORM 8.3

    DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE
              (Rule 8.3 of the City Code on Takeovers and Mergers)

1.       KEY INFORMATION

Name of person dealing  (Note 1)              Credit Suisse Securities (Europe) Ltd

Company dealt in                              Cambridge Antibody Tech Group Plc

Class of relevant security to which the       Ordinary Shares
dealings being disclosed relate (Note 2)

Date of dealing                               05 June 2006


2.       INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a) Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)


                                        Long                        Short
                                        Number      (%)             Number     (%)
(1) Relevant securities                 532,687     (1.0012%)
(2) Derivatives (other than options)
(3) Options and agreements to purchase/
sell
Total                                   532,687     (1.0012%)



(b) Interests and short positions in relevant securities of the company, other
than the class dealt in (Note 3)


Class of relevant security:                  Long              Short
                                             Number      (%)   Number    (%)
(1) Relevant securities
(2) Derivatives (other than options)
(3) Options and agreements to purchase/sell
Total



(c)      Rights to subscribe (Note 3)


Class of relevant security:       Details




3.       DEALINGS (Note 4)



(a)      Purchases and sales


Purchase/sale               Number of securities     Price per unit (Note
                                                     5) (GBP)

Buy                         502                      13.10
Buy                         3512                     13.09


(b)      Derivatives transactions (other than options)


Product name,     Long/short (Note Number of securities    Price per unit
e.g. CFD          6)               (Note 7)                (Note 5)




(c)      Options transactions in respect of existing securities

(i)       Writing, selling, purchasing or varying


Product    Writing,      Number of   Exercise  Type, e.g. Expiry    Option
name,e.g.  selling,      securities  price     American,  date      money paid/
call       purchasing,   to which              European             received
option     varying etc.  the option            etc.                 per unit
                         relates                                    (Note 5)
                         (Note 7)




(ii)      Exercising


Product name, e.g. Number of securities     Exercise price per unit (Note 5)
call option




(d)      Other dealings (including new securities) (Note 4)


Nature of transaction (Note 8)     Details              Price per unit (if
                                                        applicable) (Note 5)




4.       OTHER INFORMATION



Agreements, arrangements or understandings relating to options or derivatives



Full details of any agreement, arrangement or understanding between the person
disclosing and any other person relating to the voting rights of any relevant
securities under any option referred to on this form or relating to the voting
rights or future acquisition or disposal of any relevant securities to which any
derivative referred to on this form is referenced.  If none, this should be
stated.



..............................................................................

None

..............................................................................





Is a Supplemental Form 8 attached? (Note 9)        No


Date of disclosure                                 6 June 2006

Contact name                                       Wil Goldsmith

Telephone number                                   020 7883 3169

If a connected EFM, name of offeree/offeror with   N/A
which connected

If a connected EFM, state nature of connection     N/A
(Note 10)

Notes

The Notes on Form 8.3 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk








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