Total Voting Rights

1 June 2021

Osirium Technologies plc

("Osirium" or the "Company")

Total Voting Rights

For the purposes of DTR5.6.1R of the Transparency Directive, the Company notifies the market of the following:

As of 31 May 2021, the Company's issued and fully paid share capital consists of 29,382,014 ordinary shares ("Ordinary Shares") with nominal value of 1 pence each, with one voting right per share. The Company does not hold any Ordinary Shares in Treasury. The total number of voting rights in the Company is therefore 29,382,014.

The above figure of 29,382,014 should be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the Company, under the Disclosure and Transparency Rules.

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About Osirium

Osirium Technologies plc (AIM: OSI) operates in one of the fastest growing parts of the cybersecurity market and is a leading vendor of Privileged Access Security solutions. Osirium's cloud-based products protect critical IT assets, infrastructure and devices by preventing targeted cyber-attacks from directly accessing Privileged Accounts, removing unnecessary access and powers of Privileged Account users, deterring legitimate Privileged Account users from abusing their roles and containing the effects of a breach if one does happen.

Osirium has defined and delivered what the Directors view as the next generation Privileged Access Management solution. Osirium's award-winning Privileged Task Management module further strengthens Privileged Account Security by minimising the cyber-attack surface and delivering an impressive return on investment benefits for customers. Building on Osirium's Privileged Task Management module, in May 2019 Osirium launched Privileged Process Automation, providing a highly-flexible platform for automating essential IT processes to set a new benchmark in IT Process Automation. This was followed by the launch of Privileged Endpoint Manager in December 2019, bringing the total portfolio to three complementary solutions.

Founded in 2008 and with its headquarters in Reading, UK, the Group was admitted to AIM in April 2016. For further information please visit www.osirium.com.