Market Maker Holding

Cambridge Antibody Tech Group PLC
17 May 2006


London Stock Exchange Regulatory Announcement
Publication of Market Maker Holding under Rule 2302

Name of company:                               CAMBRIDGE ANTIBODY TECH GROUP PLC
Relevant security:                             ORD 10P
Member firm:                                   UBS INVESTMENT BANK
Percentage holding:                            5.08%
As at close of business on:                    16 MAY 2006






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