Advantest Hit by Ransomware Attack: What We Know

Advantest Corporation, a leading global supplier of semiconductor testing equipment, has confirmed it is responding to a ransomware attack detected on February 15, 2026. The incident has raised concerns about potential data breaches and operational disruptions within the critical semiconductor supply chain.

What Happened?

On February 15, Advantest detected unusual activity within its IT environment. The company immediately activated its incident response protocols, isolating affected systems and engaging third-party cybersecurity experts to investigate and contain the incident. Preliminary findings indicate that an unauthorized third party gained access to portions of the company’s network and deployed ransomware [1].

Who is Advantest?

Headquartered in Tokyo, Advantest (TSE: 6857) is a major player in the semiconductor industry, providing automatic test and measurement equipment used in the design and production of semiconductors for various applications, including 5G communications, the Internet of Things (IoT), autonomous vehicles, and artificial intelligence [1]. The company employs approximately 7,600 people and reported annual revenue exceeding $5 billion, with a market capitalization of $120 billion [2].

Is Data Affected?

As of February 20, 2026, Advantest has not confirmed any data theft. However, the company states that the investigation is ongoing and that it will notify impacted individuals directly if customer or employee data is found to be affected [1], [2]. Guidance on protective measures will be provided to those affected.

Who is Behind the Attack?

Currently, no ransomware group has claimed responsibility for the attack [2]. The investigation is actively underway, and Advantest is collaborating with leading cybersecurity experts to understand the full extent of the incident and reinforce its defenses [1].

Broader Context: Cyberattacks in Japan

This attack on Advantest is part of a recent trend of cyberattacks targeting Japanese companies. Several high-profile entities, including Washington Hotel, Nissan, Muji, Asahi, and NTT, have recently experienced data breaches and operational disruptions [2].

What’s Next?

Advantest is committed to transparency and will provide regular updates on the incident through its news website [1]. The company is focused on fully understanding the scope of the attack and strengthening its cybersecurity posture. The semiconductor industry, vital to global technology supply chains, remains a key target for cybercriminals, as evidenced by recent attacks on companies like Nexperia, TSMC, Microchip Technology, and Foxsemicon [3].