SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _ _ _ _ _ _ _ _ _ _ _ _ FORM 6-K REPORT of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of: August 2003 Filtronic plc (Exact name of registrant as specified in charter) The Waterfront, Salts Mill Road, Saltaire, Shipley West Yorkshire BD18 3TT, UK (Address of principal executive offices) Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F _ X _ Form 40-F _ _ _ Indicate by check mark whether the registrant by furnishing the information contained in the Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934 Yes _ _ _ No _ X _ <Page> SIGNATURE 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 authorised. Filtronic plc Date:August 20, 2003 By: /s/ Christopher Schofield _ _ _ _ _ _ _ _ _ _ Name: Christopher Schofield Title: Solicitor and Company Secretary SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Name of company Filtronic plc 2. Name of shareholder having a major interest Fidelity International Limited and certain of its subsidiary companies, also comprising the notifiable interest of Mr Edward C Johnson 3rd, principal shareholder of Fidelity International Limited 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 Non-beneficial interest 4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them See attached schedule 5. Number of shares / amount of stock acquired N/a 6. Percentage of issued class N/a 7. Number of shares / amount of stock disposed 124,199 8. Percentage of issued class 0.167% 9. Class of security Ordinary shares 10. Date of transaction 14 August 2003 11. Date company informed 15 August 2003 12. Total holding following this notification 9,563,076 13. Total percentage holding of issued class following this notification 12.87% 14. Any additional information 15. Name of contact and telephone number for queries Christopher Schofield +44 1274 231153 16. Name and signature of authorised company official responsible for making this notification Christopher Schofield Date of notification 19 August 2003 Filtronic plc Schedule to Schedule 10 19 August 2003 - FIL Registered Holder Shares Held Chase Nominees Ltd 5,502,670 Chase Manhatten Bank London 10,396 Nortrust Nominees Ltd 751,880 Bankers Trust 1,053,762 MSS Nominees Ltd 68,300 BT Globenet Nominees Ltd 200,350 RBS Trust Bank 427,660 Citibank 66,850 Bank of New York London 510,451 Northern Trust 415,590 HSBC 242,000 Deutche Bank 69,000 Mellon Nominees Ltd 65,500 Bank of New York Brussels 166,300 Chase Manhattan Bank, London 12,367 TOTAL 9,563,076 The FSA does not give any express or implied warranty as to the accuracy of this document or material and does not accept any liability for error or omission. The FSA is not liable for any damages (including, without limitation, damages for loss of business or loss of profits) arising in contract, tort or otherwise from the use of or inability to use this document, or any material contained in it, or from any action or decision taken as a result of using this document or any such material.