Announcement PDF Senetas Corporation Limited 312 Kings Way, South Melbourne, VIC 3205, Australia T +61 03 9868 4555 | E info@senetas.com ABN 33 006 067 607 senetas.com 1 11 May 2026 ASX ANNOUNCEMENT Senetas Corporation Limited Correction to Corporate Structure Table in Slide 10 of CEO Presentation of 8 May 2026 MELBOURNE, AUSTRALIA – Senetas Corporation Limited (ASX: SEN) (Senetas / The Company), a global leader in defence grade high-assurance network encryption solutions, today advises that it has identified an error in the percentage shareholding of Madison Park LLC reported on page 10 of the CEO Investor Presentation released to the ASX on 8 May 2026. It was reported that Madison Park held 12.0% of the issued capital of Senetas. It should have stated that the holding was 12.8%. This announcement has been authorised by Andrew Wilson, CEO. END For further information please contact: Investors Media Chris Knorr Andrea Van Unen-Smith M: +61 417 033 623 M: +61 402 772 257 E: chris.knorr@senetas.com E: andrea.vanunensmith@senetas.com ABOUT SENETAS CORPORATION LIMITED Senetas is an Australian-founded defence technology company providing high-assurance cybersecurity solutions to defence, government, and critical infrastructure organisations in more than 60 countries. Our technologies deliver certified quantum-resistant network encryption for future threats. We safeguard mission-critical communications by protecting sensitive data in motion and data at rest. Distributed globally by Thales, one of the world’s largest defence, aerospace, and cybersecurity technology providers, Senetas solutions comply with the highest international security standards and certifications, including Common Criteria and FIPS. In modern defence environments, secure communications are as critical in the field as they are in core network infrastructure. Senetas solutions extend military-grade network encryption to every location duty calls – from submarine depths to aerial missions – arming military assets with uncompromising protection against sophisticated state and criminal cyber threats.