Spectra Systems Corporation

("Spectra" or the "Company")

Share Buy-Back

The board of Spectra announces that on 6 May 2021 WH Ireland Limited purchased for cancellation 100,000 of Spectra's common shares (unrestricted line with ISIN US84756T1060) at a price of 172.16 pence per share. This purchase was made in accordance with the Company's Byelaws and with a board authority dated 8 April 2019 for up to 4,500,000 of the Company's shares to be bought back. A total of 1,046,000 common shares have been purchased and cancelled under this authority.

The Company advises that, following this purchase and cancellation, the Company's issued share capital now comprises 45,386,901 common shares as follows:

·1,052,662 shares in the Regulation S stock line ISIN number USU8457D1091 (AIM:SPSC); and

·44,334,239 shares in the unrestricted line ISIN number US84756T1060 (AIM:SPSY).

Spectra Systems has no Shares in treasury, therefore 45,386,901 may be used by shareholders, from Admission, as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change in their interest in, the share capital of the Company under the FCA's  Disclosure and Transparency Rules.

Enquiries:

Spectra Systems Corporation

Dr. Nabil Lawandy, Chief Executive Officer                                           Tel: +1 (0) 401 274 4700

WH Ireland Limited

Chris Fielding, Managing Director, Corporate Finance                     Tel: +44 (0) 20 7220 1650