FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Private Issuer Pursuant to Rule 13s - 16 or 15d - 16 of the Securities Exchange Act of 1934 For the month of March 2007 Acambis plc (Translation of registrant's name into English) Peterhouse Technology Park 100 Fulbourn Road Cambridge CB1 9PT England (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 Forms 20-F X Form 40-F Indicate by check mark whether the registrant by furnishing the information contained in this Form also thereby furnishing the 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- ). Enclosure: 1. Holding(s) in Company - 09 March 2007 2. Director/PDMR Shareholding - 21 March 2007 3. Holding(s) in Company - 26 March 2007 4. Director/PDMR Shareholding - 27 March 2007 Enclosure 1 Holding in Company Cambridge, UK and Cambridge, Massachusetts - 9 March 2007 - Acambis plc ("Acambis") (LSE: ACM) announces an interest in its shares by The Goldman Sachs Group, Inc. On 8 March 2007, Acambis received notification that, as of the close of business on 6 March 2007, The Goldman Sachs Group, Inc., ("GS Inc") of 85 Broad Street, New York, NY 10004, USA, was interested in a total of 12,887,424 ordinary shares of 10p each, representing an 11.97% holding of Acambis' issued share capital. Of these 12,887,424 shares: a) The interest in 11,739,909 shares arose from an interest held by Goldman, Sachs & Co., a wholly-owned direct subsidiary of GS Inc, acting as custodian for its customers. These shares are, or will be, registered in the name of Goldman Sachs Securities (Nominees), Limited; and b) The interest in 739,815 shares arose from a beneficial interest held by Goldman Sachs International, a wholly-owned indirect subsidiary of GS Inc. These shares are, or will be, registered at CREST in account CREPTEMP; and c) The interest in 407,700 shares arose from an interest held by GS&Co, acting as custodian of 203,850 ADRs; these ADRs are, or will be, held at The Depositary Trust Company, New York. -ends- Enquiries: Acambis plc Elizabeth Brown, Company Secretary: Tel: +44 (0) 1223 275 300 Lyndsay Wright, VP, Communications and Investor Relations: Tel: +44 (0) 1223 275 300 About Acambis Acambis is a leading biotechnology company targeting infectious diseases with novel vaccines. Acambis' development-stage pipeline includes vaccines that could either offer improvements over existing products or target unmet medical needs. As well as ChimeriVax-JE, Acambis' proprietary ChimeriVax technology, developed in association with St Louis University, has also been used to develop ChimeriVax-West Nile, which is undergoing Phase 2 clinical testing, making it the most advanced investigational vaccine against the West Nile virus. Acambis also has the only vaccine in development against Clostridium difficile bacteria, a leading cause of hospital-acquired infections. Recognised internationally as the leading producer of smallpox vaccines, Acambis is developing an investigational smallpox vaccine, ACAM2000, and is manufacturing emergency-use stockpiles of this investigational vaccine for the US Government and other governments around the world. Acambis is based in Cambridge, UK and Cambridge, Massachusetts, US, and is listed on the London Stock Exchange (ACM). More information is available at www.acambis.com. "Safe Harbor" statement under the Private Securities Litigation Reform Act of 1995: The statements in this news release that are not historical facts are forward-looking statements that involve risks and uncertainties, including the timing and results of clinical trials, product development, manufacturing and commercialisation risks, the risks of satisfying the regulatory approval process in a timely manner, the need for and the availability of additional capital. For a discussion of these and other risks and uncertainties see "Risk management" in the Company's 2005 Annual Report and "Risk factors" in its Form 20-F, in addition to those detailed on the Company's website and in the Company's filings made with the Securities and Exchange Commission from time to time. These forward-looking statements are based on estimates and assumptions made by the management of Acambis and are believed to be reasonable, though are inherently uncertain and difficult to predict. Actual results or experience could differ materially from the forward-looking statements. Enclosure 2 Increase in Director's shareholding Cambridge, UK and Cambridge, Massachusetts - 21 March 2007 - Acambis plc ("Acambis") (LSE: ACM) announces that on 20 March 2007 Ross Graham, Non-executive Director, purchased a total of 14,580 shares at 136p per share. After this transaction, the shareholding in Acambis held by Mr Graham was 20,708 shares, representing approximately 0.02% of Acambis' issued share capital. -ends- Enquiries: Acambis plc Elizabeth Brown, Company Secretary Lyndsay Wright, VP, Communications and Investor Relations Tel: +44 (0) 1223 275 300 About Acambis Acambis is a leading biotechnology company targeting infectious diseases with novel vaccines. Acambis' development-stage pipeline includes vaccines that could either offer improvements over existing products or target unmet medical needs. As well as ChimeriVax-JE, Acambis' proprietary ChimeriVax technology, developed in association with St Louis University, has also been used to develop ChimeriVax-West Nile, which is undergoing Phase 2 clinical testing, making it the most advanced investigational vaccine against the West Nile virus. Acambis also has the only vaccine in development against Clostridium difficile bacteria, a leading cause of hospital-acquired infections. Recognised internationally as the leading producer of smallpox vaccines, Acambis is developing an investigational smallpox vaccine, ACAM2000, and is manufacturing emergency-use stockpiles of this investigational vaccine for the US Government and other governments around the world. Acambis is based in Cambridge, UK and Cambridge, Massachusetts, US, and is listed on the London Stock Exchange (ACM). More information is available at www.acambis.com. "Safe Harbor" statement under the Private Securities Litigation Reform Act of 1995: The statements in this news release that are not historical facts are forward-looking statements that involve risks and uncertainties, including the timing and results of clinical trials, product development, manufacturing and commercialisation risks, the risks of satisfying the regulatory approval process in a timely manner, the need for and the availability of additional capital. For a discussion of these and other risks and uncertainties see "Risk management" in the Company's 2005 Annual Report and "Risk factors" in its Form 20-F, in addition to those detailed on the Company's website and in the Company's filings made with the Securities and Exchange Commission from time to time. These forward-looking statements are based on estimates and assumptions made by the management of Acambis and are believed to be reasonable, though are inherently uncertain and difficult to predict. Actual results or experience could differ materially from the forward-looking statements. Enclosure 3 Holding in Company Cambridge, UK and Cambridge, Massachusetts - 26 March 2007 - Acambis plc ("Acambis") (LSE: ACM) announces an interest in its shares by The Goldman Sachs Group, Inc. On 23 March 2007, Acambis received notification that, as of the close of business on 21 March 2007, The Goldman Sachs Group, Inc., ("GS Inc") of 85 Broad Street, New York, NY 10004, USA, was interested in a total of 11,186,455 ordinary shares of 10p each, representing an 10.42% holding of Acambis' issued share capital. Of these 11,186,455 shares: a) The interest in 878,515 shares arose from an interest held by Goldman, Sachs & Co., a wholly-owned direct subsidiary of GS Inc, acting as custodian for its customers. These shares are, or will be, registered in the name of Goldman Sachs Securities (Nominees), Limited; and b) The interest in 10,253,440 shares arose from a beneficial interest held by Goldman Sachs International, a wholly-owned indirect subsidiary of GS Inc. These shares are, or will be, registered at CREST in account CREPTEMP; and c) The interest in 54,500 shares arose from an interest held by Goldman Sachs & Co, acting as custodian of 27,250 ADRs; these ADRs are, or will be, held at The Depositary Trust Company of New York. -ends- Enquiries: Acambis plc Elizabeth Brown, Company Secretary: Tel: +44 (0) 1223 275 300 Lyndsay Wright, VP, Communications and Investor Relations: Tel: +44 (0) 1223 275 300 About Acambis Acambis is a leading biotechnology company targeting infectious diseases with novel vaccines. Acambis' development-stage pipeline includes vaccines that could either offer improvements over existing products or target unmet medical needs. As well as ChimeriVax-JE, Acambis' proprietary ChimeriVax technology, developed in association with St Louis University, has also been used to develop ChimeriVax-West Nile, which is undergoing Phase 2 clinical testing, making it the most advanced investigational vaccine against the West Nile virus. Acambis also has the only vaccine in development against Clostridium difficile bacteria, a leading cause of hospital-acquired infections. Recognised internationally as the leading producer of smallpox vaccines, Acambis is developing an investigational smallpox vaccine, ACAM2000, and is manufacturing emergency-use stockpiles of this investigational vaccine for the US Government and other governments around the world. Acambis is based in Cambridge, UK and Cambridge, Massachusetts, US, and is listed on the London Stock Exchange (ACM). More information is available at www.acambis.com. "Safe Harbor" statement under the Private Securities Litigation Reform Act of 1995: The statements in this news release that are not historical facts are forward-looking statements that involve risks and uncertainties, including the timing and results of clinical trials, product development, manufacturing and commercialisation risks, the risks of satisfying the regulatory approval process in a timely manner, the need for and the availability of additional capital. For a discussion of these and other risks and uncertainties see "Risk management" in the Company's 2005 Annual Report and "Risk factors" in its Form 20-F, in addition to those detailed on the Company's website and in the Company's filings made with the Securities and Exchange Commission from time to time. These forward-looking statements are based on estimates and assumptions made by the management of Acambis and are believed to be reasonable, though are inherently uncertain and difficult to predict. Actual results or experience could differ materially from the forward-looking statements. Enclosure 4 Director's interest in shares Cambridge, UK and Cambridge, Massachusetts - 27 March 2007 - Acambis plc ("Acambis") (LSE: ACM) announces that, on 26 March 2007, a share option grant was made to Dr Michael Watson, Executive Vice President, Research and Development. The 275,280 share options were granted under the Acambis 2006 Unapproved Share Option Plan over ordinary 10p shares at an exercise price of 139p per share. The options are exercisable between 26 March 2010 and 26 March 2017. No amount was payable by Dr Watson on the grant of these share options. Following this transaction, the total shares over which options are held by Dr Watson was 275,280. -ends- Enquiries: Acambis plc Elizabeth Brown, Company Secretary Lyndsay Wright, VP, Communications and Investor Relations Tel: +44 (0) 1223 275 300 About Acambis Acambis is a leading biotechnology company targeting infectious diseases with novel vaccines. Acambis' development-stage pipeline includes vaccines that could either offer improvements over existing products or target unmet medical needs. As well as ChimeriVax-JE, Acambis' proprietary ChimeriVax technology, developed in association with St Louis University, has also been used to develop ChimeriVax-West Nile, which is undergoing Phase 2 clinical testing, making it the most advanced investigational vaccine against the West Nile virus. Acambis also has the only vaccine in development against Clostridium difficile bacteria, a leading cause of hospital-acquired infections. Recognised internationally as the leading producer of smallpox vaccines, Acambis is developing an investigational smallpox vaccine, ACAM2000, and is manufacturing emergency-use stockpiles of this investigational vaccine for the US Government and other governments around the world. Acambis is based in Cambridge, UK and Cambridge, Massachusetts, US, and is listed on the London Stock Exchange (ACM). More information is available at www.acambis.com. "Safe Harbor" statement under the Private Securities Litigation Reform Act of 1995: The statements in this news release that are not historical facts are forward-looking statements that involve risks and uncertainties, including the timing and results of clinical trials, product development, manufacturing and commercialisation risks, the risks of satisfying the regulatory approval process in a timely manner, the need for and the availability of additional capital. For a discussion of these and other risks and uncertainties see "Risk management" in the Company's 2005 Annual Report and "Risk factors" in its Form 20-F, in addition to those detailed on the Company's website and in the Company's filings made with the Securities and Exchange Commission from time to time. These forward-looking statements are based on estimates and assumptions made by the management of Acambis and are believed to be reasonable, though are inherently uncertain and difficult to predict. Actual results or experience could differ materially from the forward-looking statements. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant Peptide Therapeutics Group has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Date: 30 March 2007 ACAMBIS PLC By: /s/ Lyndsay Wright Name: Lyndsay Wright Title: VP, Communications and IR.