SThree plc 15 December 2005 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Name of company SThree plc 2. Name of shareholder having a major interest Simon Arber 3. Please state whether notification indicates that it is in respect of holding of the shareholder named in 2 above or in respect of a non-beneficial interest or in the case of an individual holder if it is a holding of that person's spouse or children under the age of 18 As 2 above 4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them 23,386,317 Simon Arber 5. Number of shares / amount of stock acquired 735,999 6. Percentage of issued class N/A 7. Number of shares / amount of stock disposed N/A 8. Percentage of issued class N/A 9. Class of security Ordinary Shares of 1p 10. Date of transaction 9 December 2005 11. Date company informed 15 December 2005 12. Total holding following this notification 23,386,317 13. Total percentage holding of issued class following this notification 16.9% 14. Any additional information Notification received under s198 Companies Act 1985 15. Name of contact and telephone number for queries Ian Colletts 020 7292 3838 16. Name and signature of authorised company official responsible for making this notification Ian Colletts, Company Secretary, SThree Date of notification 15 December This information is provided by RNS The company news service from the London Stock Exchange