FORM 6-K SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 October 22, 2007 Commission File Number 001-14978 SMITH & NEPHEW plc (Registrant's name) 15 Adam Street London, England WC2N 6LA (Address of registrant's principal executive offices) [Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.] Form 20-F X Form 40-F --- --- [Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1).] Yes No X --- --- [Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7).] Yes No X --- --- [Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing information to the Commission pursuant to Rule 12g3-2 (b) under the Securities Exchange Act of 1934.] Yes No X --- --- If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2 (b) : 82- n/a. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. Smith & Nephew plc (Registrant) Date: October 22, 2007 By: /s/ Paul Chambers ----------------- Paul Chambers Company Secretary 22 October 2007 Transaction in own shares. Smith & Nephew plc announces that on 22 October 2007 it purchased 250,000 ordinary shares of US$0.20 each at a price of 608.3058 pence per share. The purchased shares will be held as treasury shares. Following the above purchase, Smith & Nephew plc holds 42,290,000 ordinary shares in treasury, and has 904,291,014 ordinary shares in issue (excluding treasury shares). Paul Chambers Company Secretary