Market Maker Holding

Cambridge Antibody Tech Group PLC
23 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:                            4.04%

As at close of business on:                    18 MAY 2006






                      This information is provided by RNS
            The company news service from the London Stock Exchange