Advantest Responds to Cybersecurity Incident

TOKYO, Japan – Feb. 19, 2026 – Leading semiconductor test equipment supplier Advantest Corporation (TSE: 6857) announced today that it is responding to a cybersecurity incident involving ransomware that may have impacted certain systems within its network. Please also note that the information contained in this report is subject to change if new facts or changes in the facts are confirmed as a result of the ongoing investigation.

On Feb. 15 (JST), the company detected unusual activity within its IT environment. Upon detection, Advantest immediately activated its incident response protocols, isolated affected systems, and engaged leading third-party cybersecurity experts to assist in the investigation and containment of the incident.

Preliminary findings appear to indicate that an unauthorized third party may have gained access to portions of the company’s network and deployed ransomware. If our investigation determines that customer or employee data was affected, we will notify impacted persons directly and provide guidance on protective measures. This investigation is actively ongoing and is being carried out in close collaboration with leading cybersecurity experts. Advantest is focused on understanding the full extent of this incident while reinforcing all possible defenses.

The investigation is ongoing. Advantest is dedicated to transparency and will provide regular updates on https://www.advantest.com/tw/news/.

Advantest (TSE: 6857) is the leading manufacturer of automatic test and measurement equipment used in the design and production of semiconductors for applications including 5G communications, the Internet of Things (IoT), autonomous vehicles, high-performance computing (HPC), including artificial intelligence (AI) and machine learning, and more. Its leading-edge systems and products are integrated into the most advanced semiconductor production lines in the world. The company also conducts R&D to address emerging testing challenges and applications; develops advanced test-interface solutions for wafer sort and final test; produces scanning electron microscopes essential to photomask manufacturing; and offers system-level test solutions and other test-related accessories. Founded in Tokyo in 1954, Advantest is a global company with facilities around the world and an international commitment to sustainable practices and social responsibility. More information is available at www.advantest.com/tw/.