Microsaic Regulatory News (MSYS)

Microsaic Systems plc

("Microsaic", "Microsaic Systems" or the "Company")

Holdings in Company

29 May 2012

Microsaic Systems plc (AIM: MSYS), has today received confirmation of the sale on 29 May 2012 by Alan Finlay, a former director of the Company, of 1,000,000 ordinary shares of 0.25p each in the capital of the Company ("Ordinary Shares") at a price of 40p per share.

Prior to the sale, Mr Finlay and his family members held 3,214,940 Ordinary Shares (representing approximately 7.62 per cent. of the Company's issued share capital as enlarged by the conditional placing announced today ("Placing")). As a result of the sale of approximately 31.1 per cent. of their interests, Mr Finlay and his family members now hold 2,214,940 Ordinary Shares representing approximately 5.21 per cent. of the Company's issued share capital (as enlarged by the Placing). This holding remains subject to the orderly marketing provisions outlined in the Company's AIM Admission Document dated 5 April 2011.

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About Microsaic Systems

Microsaic Systems develops and sells chip-based scientific instruments for the chemical identification of substances. The Company's products are based on the 'gold-standard' scientific technique of mass spectrometry.

Microsaic Systems has developed a miniaturised mass spectrometer based on its patented, chip-based technologies (ionchip®, spraychip® and vac-chip™), that is smaller, lighter, quieter, more energy efficient and cheaper to run than conventional mass spectrometer systems.

Mass spectrometry is used across many industry sectors, including government, energy, utilities, pharmaceutical, diagnostics and healthcare, environmental, food and drink, security and defence, and industrial chemicals - a combined market of $3.3 billion in 2010.

Microsaic Systems was established in 2001 by a team including founders from Imperial College London, and was admitted to AIM in April 2011 under the symbol MSYS.

www.microsaic.com