Advantest Corporation, a leading global supplier of automated test systems for semiconductor manufacturing, has begun notifying individuals whose personal data was compromised during a ransomware incident earlier this year. The breach occurred on February 15, 2026, when an unauthorized actor penetrated the company's network infrastructure and extracted sensitive information from its servers.

When the intrusion was first disclosed in February, Advantest stated that attackers had accessed portions of its network and installed ransomware, though the company was unable to confirm at that time whether customer or employee records had been affected. An October 6, 2026 data breach notification now confirms that personal data was indeed stolen during the incident.

In February 2026, Advantest became aware of a cybersecurity incident in which an unauthorized third party accessed Advantest systems and extracted some data from our servers. The data extracted from our servers included PII (personally identifiable information) belonging to you.

Advantest notification

Exposed data categories

The compromised records contain multiple categories of sensitive personal information:

  • Contact information
  • Date of birth
  • Social Security Number (SSN)
  • National ID number
  • Driver's License
  • Passport number
  • Medical information
  • Financial information
  • Other ID numbers

The company has not disclosed whether the affected individuals are customers, employees, partners, or a mix of these groups. Advantest has not responded to inquiries regarding the total number of people impacted by the breach.

Mitigation measures and monitoring

Advantest states it has found no evidence that the stolen data has been publicly released or otherwise misused, though the organization acknowledges the heightened risk of identity theft and fraud for those whose information was exposed. To help mitigate potential harm, the company is offering affected individuals complimentary 18-month identity theft, credit, and web monitoring services through Kroll, with enrollment available until January 4, 2027.

Beyond enrolling in monitoring services, individuals are advised to regularly review their financial accounts and statements for unauthorized activity, report any suspicious transactions to their financial institutions, remain vigilant against phishing schemes, refrain from clicking unsolicited links or opening unexpected attachments, and never provide money or confidential information in response to unsolicited email or text communications.

Ransomware group claims

As of publication, no known ransomware groups have publicly claimed responsibility for the Advantest attack or posted evidence of the stolen data.