CAT Catco Reinsurance Opportunities Fund Limited

    DEALINGS BY CONNECTED EXEMPT PRINCIPAL TRADERS
                       WITH RECOGNISED INTERMEDIARY STATUS
                      DEALING IN A CLIENT-SERVING CAPACITY
                       (Rule 38.5(a) of the Takeover Code)

1.   KEY INFORMATION

Name of exempt principal      J.P. Morgan Securities Ltd.
trader
Company dealt in              Cambridge Antibody Technology Group Plc
Class of relevant security    Ordinary Shares
to which the dealings being
disclosed relate (Note 1)
Date of dealing               02 June 2006


2.   DEALINGS (Note 2)

(a)  Purchases and sales

Total number of          Highest price paid      Lowest price paid (Note
securities purchased     (Note 3)                3)

                                                 
5,000                    13.155 GBP              13.155 GBP

     

Total number of          Highest price received  Lowest price received
securities sold          (Note 3)                (Note 3)

                                                 
5,000                    13.115 GBP              13.06 GBP
                                                 


(b)  Derivatives transactions (other than options)

Product       Long/short       Number of securities   Price per unit
name,         (Note 4)         (Note 5)               (Note 3)
e.g. CFD
                                                      

     
     
(c)  Options transactions in respect of existing securities

(i)  Writing, selling, purchasing or varying

Product       Writing,    Number of    Exerc   Type,    Expir   Option
name,         selling,    securities   ise     e.g.     y       money
e.g. call     purchasin   to which the price   American date    paid/rece
option        g,          option               ,                ived per
              varying     relates              European         unit
              etc.        (Note 5)             etc.             (Note 3)
                                                                

(ii) Exercising

Product name, e.g. call  Number of securities    Exercise price per unit
option                                           (Note 3)
                                                 
                                                 
                                                 
3.   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.






Date of disclosure                         05 June 2006
Contact name                               Shoaib Shaikh
Telephone number                           020 7777 0423
Name of offeree/offeror with which         Cambridge Antibody Technology
connected                                  Group Plc
Nature of connection (Note 6)              2


Notes

The Notes on Form 38.5(a) can be viewed on the Takeover Panels website at
www.thetakeoverpanel.org.uk

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