EXHIBIT 99.01
Hampshire International Business Park Chineham Basingstoke Hampshire RG24 8EP United Kingdom Tel +44 (0)1256 894000 Fax +44 (0)1256 894708 www.shire.com
Press Release

31 March 2006

Shire plc (the “Company”)

The Company announces that it was notified on 30 March 2006 under Sections 198 to 203 of the Companies Act that, at close of business on 28 March 2006, The Goldman Sachs Group, Inc., was interested in 24,229,828 ordinary shares of £0.05p each in the capital of the Company. This holding represents 4.86 per cent of the issued ordinary share capital of the Company.

T May
Company Secretary

For further information please contact:

Investor Relations	Cléa Rosenfeld (Rest of the World)	+44 1256 894 160
	Brian Piper (North America)	+1 484 595 8252

Notes to editors

SHIRE PLC

Shire’s strategic goal is to become the leading specialty pharmaceutical company that focuses on meeting the needs of the specialist physician. Shire focuses its business on central nervous system (CNS), gastrointestinal (GI), general products (GP) and human genetic therapies (HGT) - all being areas in which Shire has a commercial presence. The structure is sufficiently flexible to allow Shire to target new therapeutic areas to the extent opportunities arise through acquisitions. Shire believes that a carefully selected portfolio of products with a strategically aligned and relatively small-scale sales force will deliver strong results. Shire’s focused strategy is to develop and market products for specialty physicians. This approach aims to deliver increased returns and lower risks. Shire’s in-licensing and merger and acquisition efforts are focused on products in niche markets with strong intellectual property protection either in the US or Europe.

For further information on Shire, please visit the Company’s website: www.shire.com.

Registered in England 2883758 Registered Office as above