<div id="readability-page-1"><div>RNS Number : 6865R Corero Network Security PLC 04 February 2026 4 February 2026Corero Network Security plc(&#34;Corero&#34; or the &#34;Company&#34;)Notice of PDMR DealingsThe Company announces that Carl Herberger, Chief Executive Officer of Corero, has purchased 138,000 Ordinary Shares. Following this purchase, Carl Herberger has a total beneficial interest in 1,835,122 Ordinary Shares equivalent to 0.36% per cent. of the Company's issued share capital.The notification below, which has been made in accordance with the requirements of the UK Market Abuse Regulation, provide further detail.Enquiries:<div><table><tbody><tr><td>Corero Network Security plc</td><td>Tel: +44(0) 20 7390 0230</td></tr><tr><td>Carl Herberger, Chief Executive Officer</td><td></td></tr><tr><td>Chris Goulden, Chief Financial Officer</td><td></td></tr><tr><td>Canaccord Genuity Limited (Nominated Adviser and Joint Broker)</td><td>Tel: +44(0) 20 7523 8000</td></tr><tr><td>Simon Bridges / Andrew Potts / Harry ReesZeus Capital (Joint Broker)Ben Robertson / Ed Beddows</td><td>Tel: +44(0) 20 3829 5000</td></tr><tr><td>Vigo Consulting (U.K Financial PR and Investor Relations)</td><td>Tel: +44(0) 20 7390 0230</td></tr><tr><td>Jeremy Garcia / Anna Sutton</td><td></td></tr><tr><td>corero@vigoconsulting.com</td><td></td></tr><tr><td>Harbor Access (U.S Investor Relations)Jonathan Paterson</td><td>Tel: +1 475 477 9401</td></tr></tbody></table></div>About Corero Network SecurityCorero Network Security is a leading provider of DDoS protection solutions, specialising in automatic detection and protection solutions with network visibility, analytics, and reporting tools. Corero's technology protects against external and internal DDoS threats in complex edge and subscriber environments, ensuring internet service availability. With operational centres in Marlborough, Massachusetts, USA, and Edinburgh, UK, Corero is headquartered in London and listed on the London Stock Exchange's AIM market (ticker: CNS) and the US OTCQX Market (OTCQX: DDOSF).For more information, visit www.corero.com, and follow us on LinkedIn and X.Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them.<div><table><tbody><tr><td>1</td><td colspan="2">Details of the person discharging managerial responsibilities / person closely associated</td></tr><tr><td>a)</td><td>Name</td><td>Carl Herberger</td></tr><tr><td>2</td><td colspan="2">Reason for the notification</td></tr><tr><td>a)</td><td>Position/status</td><td>Chief Executive Officer</td></tr><tr><td>b)</td><td>Initial notification /Amendment</td><td>Initial notification</td></tr><tr><td>3</td><td colspan="2">Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor</td></tr><tr><td>a)</td><td>Name</td><td>Corero Network Security plc</td></tr><tr><td>b)</td><td>LEI</td><td>2138001EVYT2OI1C4Y98</td></tr><tr><td>4</td><td colspan="2">Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted</td></tr><tr><td>a)</td><td>Description of the financial instrument, type of instrumentIdentification code</td><td>Ordinary shares of 1p each in Corero Network Security plcISIN: GB00B54X0432</td></tr><tr><td>b)</td><td>Nature of the transaction</td><td>Purchase of ordinary shares</td></tr><tr><td>c)</td><td>Price(s) and volume(s)</td><td><div><table><tbody><tr><td>Price(s)</td><td>Volume(s)</td></tr><tr><td>13.26 pence</td><td>138,000 shares</td></tr></tbody></table></div></td></tr><tr><td>d)</td><td>Aggregated information- Aggregated volume- Price</td><td> N/A</td></tr><tr><td>e)</td><td>Date of the transaction</td><td>3 February 2026</td></tr><tr><td>f)</td><td>Place of the transaction</td><td>London Stock Exchange - AIM</td></tr></tbody></table></div>This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy. END DSHVZLBBQLLLBBB</div></div>

Corero Network Security PLC announced that CEO Carl Herberger purchased 138,000 Ordinary Shares at 13.26 pence each, increasing his total beneficial interest to 1,835,122 shares, representing 0.36% of the company's issued share capital. This transaction was disclosed in accordance with UK Market Abuse Regulation. Corero specializes in DDoS protection solutions and is listed on the London Stock Exchange's AIM market.

REG - Corero Network Sec. - Director/PDMR Shareholding