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 5 January 2005 Commission File Number 000-02404 BALTIMORE TECHNOLOGIES PLC (Registrant's name) Baltimore Technologies plc, Innovation House, Mark Road Hemel Hempstead, Herts, HP2 7DN, United Kingdom (Address of principal executive offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or 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): _____ 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): _____ Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3(b) under the Securities 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). EXHIBIT INDEX Press Release regarding Disclosure of Shares dated 5 January 2005 5 January 2005 BALTIMORE TECHNOLOGIES PLC (Ticker: Reuters BLM.L or Bloomberg: BLM LN) ("Baltimore" or "the Company") Disclosure of Material Interest in Shares The Company has received the following announcement: Disclosure of Material Interest in Shares - Companies Act 1985, Section 198 From: Acquisitor Holdings (Bermuda) Limited Issued Capital: 430,647 ordinary shares of 125p each As at 5 January 2005 the following entities had a material interest(s) in shares of Baltimore Technologies Plc: Acquisitor Holdings (Bermuda) Limited Number of ordinary shares acquired: 12,000 Percentage of issued class: 2.79% Date of Transaction: 31 December 2004 Date Company informed: 5 January 2004 Total ordinary shareholding following this notification: 123,897 Total percentage ordinary shareholding following this notification: 28.77% Name of signatory Dawna Ferguson Telephone and extension number 001 441 299 4916 ---ENDS--- Enquiries: Bishopsgate Communications Ltd. Tel: 020 7430 1600 Maxine Barnes Dominic Barretto Email: maxine@bishopsgatecommunications.com 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. Baltimore Technologies plc By: /s/Tim Lovell Name: Tim Lovell Title: Finance Director Date: 5 January 2005