Corero Network Regulatory News (CNS)

Corero Network Security plc

("Corero" or "the Group")

Increase in Holdings

Corero Network Security plc (AIM: CNS), the network security and business software provider, announces that André Stewart, a former employee of the Group is now interested in 6,039,023 ordinary shares of the Company ("Ordinary Shares"), representing 10.3% of Corero's issued share capital. This follows an exercise by Mr Stewart of share options over a total of 308,000 Ordinary Shares.

Accordingly, the Company has today issued 308,000 new Ordinary Shares and application has been made for the new Ordinary Shares to be admitted to trading on AIM, which will rank pari passu with the Company's existing Ordinary Shares, and admission is expected to be effective on 12 November 2012.

Following admission of the new Ordinary Shares, the Company will have 58,637,412 Ordinary Shares in issue with each share carrying the right to one vote. There are no shares held in Treasury. The total number of voting rights in Corero is therefore 58,637,412. This number may be used by shareholders as the denominator for the calculation by which they may determine if they are required to notify their interest in, or a change in their interest in, Corero under the Disclosure and Transparency Rules.

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About Corero Network Security

Corero Network Security plc consists of two businesses: Corero Network Security and Corero Business Systems.

Corero Network Security is an international network security company and the leading provider of Distributed Denial of Service (DDoS) defence and Next Generation Intrusion Prevention Systems (NGIPS) solutions. As the First Line of Defense, Corero's products and services stop DDoS attacks, protect IT infrastructure and eliminate downtime. Customers include enterprises, service providers and government organizations worldwide. Corero's appliance-based solutions are dynamic and automatically respond to evolving cyber attacks, known and unknown, allowing existing IT infrastructure -- such as firewalls -- to perform their intended purposes. Corero's products are transparent, highly scalable and feature the lowest latency and highest reliability in the industry.

Corero Business Systems is a leading provider of powerful and dynamic modular accounting, human resources, payroll and management information software to the schools (including academies) and further education sectors in the UK and internationally.