For immediate release                                                                                  7 July 2023

Block Listing Application

Porvair plc ("Porvair", the "Group" or the "Company"), the specialist filtration, laboratory and environmental technologies group, announces that an application has been made to the Financial Conduct Authority ("FCA") and London Stock Exchange ("LSE") in order to increase an existing block listing of ordinary shares of 2 pence per share ("Ordinary Shares") used to satisfy the issue of shares pursuant of options under the Porvair plc SAYE Share Option Plan 2014 ("SAYE Plan").

Application has been made for the admission of 286,950 new Ordinary Shares to the Premium Listing segment of the Official List of the FCA and to trading on the main market of the LSE (together "Admission"). New Ordinary Shares issued under the block listing will rank parri passu in respect with the exiting Ordinary Shares of the Company. It is expected that Admission will become effective on 11 July 2023.

The Company's issued share capital will not change as a result of the changes to the block listings set out above.

Total Voting Rights

Following Admission, the Company's issued share capital will comprise 46,359,798 ordinary shares of 2 pence each. The Company does not hold any shares in treasury. This figure may be used by shareholders in the Company as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change of interest in, the share capital of the Company under the FCA's Disclosure, Guidance and Transparency Rules.

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Notes to editors

Porvair plc

Porvair is a group of specialist filtration, laboratory and environmental technology businesses.  Its businesses design and manufacture a range of bespoke consumable filtration products that are used in a range of niche filtration markets.  It operates in three divisions: Aerospace & Industrial; Laboratory; and Metal Melt Quality.