FORM 8.1(b)(ii)

                   DEALINGS BY CONNECTED EXEMPT FUND MANAGERS
                       ON BEHALF OF DISCRETIONARY CLIENTS
           (Rule 8.1(b)(ii) of the City Code on Takeovers and Mergers)


1.   KEY INFORMATION

Name of exempt fund manager   Highbridge Capital Management LLC
Company dealt in              Cambridge Antibody Technology Group Plc
Class of relevant security    Ordinary Shares
to which the dealings being
disclosed relate 1
Date of dealing               15 May 2006


2.   INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a)  Interests and short positions (following dealing) in the class of relevant
security dealt in 2

                                      Long                  Short

                              Number                Number
                              (%)                   (%)
(1) Relevant securities 3                           
   
(2)  Derivatives (other  than 15,795 (0.029%)       
options)
   
(3) Options and agreements                          
to purchase/sell
   
Total                         15,795 (0.029%)       


(b)  Interests and short positions in relevant securities of the company, other
     than the class dealt in 2

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


(c)  Rights to subscribe 2

Class of relevant security:   Details

                              


3.   DEALINGS 4

(a)  Purchases and sales

Purchase/sale            Number of securities    Price per unit  5

                                                 


(b)  Derivatives transactions (other than options)

Product       Long/short 6     Number of securities   Price per unit 5
name,                          7
e.g. CFD
                                                      
Equity Swap   Short            600                    12.9775 GBP

     
(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 7            European         unit 5
              etc.                             etc.
                                                                

(ii) Exercising

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

(d)  Other dealings (including new securities) 4

Nature of transaction 7  Details                 Price per unit (if
                                                 applicable) 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.





Is a Supplemental Form 8 attached? 9                   YES/NO


Date of disclosure                         16 May 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 10                    2

Notes

1  See  the definition of relevant securities in the Definitions Section
.  of the Code.
   
2  See Note 5 on Rule 8 and the definition of interests in securities in
.  the  Definitions  Section of the Code.  Rights  to  subscribe  for  new
   shares  should  be  disclosed  separately  from  interests  and   short
   positions   in  existing  securities.   Rights  to  subscribe   include
   directors and other executive options.
   
3  Where relevant securities are held within a fund in respect of which
.  seed capital represents 10% or more of the funds under management,
   specify the percentage of seed capital in addition to the amount of
   stock held within that fund.
   
4  See the definition of dealings in the Definitions Section of the
.  Code.
   
5  For all prices and other monetary amounts, the currency must be stated.
.  
6  If a long position has been increased or a short position reduced as  a
.  result  of  the  dealing, write long.  If a short position  has  been
   increased or a long position reduced as a result of the dealing,  write
   short.   If the dealing has not resulted in a long or short  position
   being  increased  or  reduced, give details of the variation  or  other
   dealing.
   
7  See Note 3 on the definition of interests in securities in the
.  Definitions Section of the Code.
   
8  State type of dealing, e.g. subscription, conversion, exercise
.  etc.
   
9  Where  there  are  open  option positions or open derivative  positions
.  (other  than  CFDs), or where there is an agreement to purchase  or  to
   sell, Supplemental Form 8 should be completed.
   
1  See the definition of connected fund managers and principal traders
0  in the Definitions Section of the Code.
.  


For  details of the Codes dealing disclosure requirements, see Rule 8  and  its
Notes   which   can   be   viewed   on   the   Takeover   Panels   website   at
www.thetakeoverpanel.org.uk.




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