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Data Breach Response / Advantest America, Inc. · Updated October 6, 2026 Independent coverage, not a communication from Advantest America, Inc.

Advantest America, Inc. Data Breach: What Happened and What You Should Do

Advantest America, Inc. disclosed a data breach affecting an unconfirmed number of people. Here's what is currently known about the incident, what information may have been exposed, and steps you can consider taking.

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Notification underway Sources listed below
Breach snapshotUpdated October 6, 2026
Company
Advantest America, Inc.
People affected
Undisclosed

Vermont AG table lists 8 Vermont residents; Advantest has not published a total number of people affected.

Incident date
On or about January 23, 2026
Discovered
February 15, 2026
Disclosed
February 19, 2026
Information exposed
Possibly: Physical address, Phone number, Email address, Date of birth, Social Security number, Government identification, Health information, Financial information, Other personal information
Status
Notification underway

Public announcement February 19, 2026; update March 4, 2026; California AG filing October 5, 2026; sample letter dated October 6, 2026; Vermont AG listing October 5, 2026.

What happened in the Advantest America, Inc. breach?

How the attacker got in

Cybersecurity incident involving ransomware in which an unauthorized third party accessed Advantest systems and extracted data from its servers.

Timeline of what is known

  1. 01On or about January 23, 2026Unauthorized access
  2. 02February 15, 2026Breach discovered
  3. 03February 19, 2026Breach disclosed publicly
  4. 04October 6, 2026Affected individuals notified

Dates come from the sources listed at the bottom of this page. Separate events are kept separate; where a date has not been disclosed, it says so.

Protect My Information See recommended steps

What information was exposed?

The categories below come from Advantest America, Inc.'s disclosure and the sources listed on this page. Each is labeled by what the evidence supports. Categories not mentioned in any source are not listed, even if they are common in similar breaches.

Exposed May have been exposed Access not confirmed

Physical address

Contact information (Advantest sample letter; specific contact details not itemized).

May have been exposed

Phone number

Contact information (Advantest sample letter; specific contact details not itemized).

May have been exposed

Email address

Contact information (Advantest sample letter; specific contact details not itemized).

May have been exposed

Date of birth

Date of birth (Advantest sample letter).

May have been exposed

Social Security number

Social Security number (Advantest sample letter; Vermont AG table).

May have been exposed

Government identification

National ID number, driver's license number, or passport number (Advantest sample letter).

May have been exposed

Health information

Medical information (Advantest sample letter).

May have been exposed

Financial information

Financial information (Advantest sample letter); Vermont AG table lists financial account codes and credit and debit account information.

May have been exposed

Other personal information

Other ID numbers (Advantest sample letter).

May have been exposed
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Why this information matters

The risks below are the ones associated with the categories of information involved in this breach. This describes how exposed information can be used in general. It does not state that any of this has happened with data from this incident.

Information from one breach can sometimes be combined with information from other breaches or public sources. A name and email address on their own are limited. Paired with a date of birth from one leak and an address from a people-search site, they become enough to answer a security question or make a scam call sound informed.

Whether the data from this breach has been sold, shared, or used is not known unless a source on this page says so. Where that is documented, it appears in the "What happened" section above.

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If you were affected, consider doing these things now

Practical steps for this breach, in rough order of priority. None of these require buying anything. Monitoring services, including ours, are one option among several.

  1. 01Activate the complimentary credit and web monitoring in your letter before January 4, 2027.
  2. 02Consider a free credit freeze or fraud alert with Equifax, Experian, and TransUnion, since Social Security and ID numbers may be involved.
  3. 03Review account statements and free credit reports at annualcreditreport.com for activity you do not recognize.
  4. 04Be cautious of emails, calls, and texts that mention Advantest or ask for personal information or payment.
  5. 05Call Advantest's Support Center at 1-844-301-0189 with questions about your letter.
Protect My Information See monitoring & recovery options

AI Protection

Monitoring, removal, and recovery help for what comes after a breach.

A breach puts information you can't take back into circulation. AI Protection watches for it being misused, reduces what else can be found about you, and helps you recover if something goes wrong. It cannot undo the breach or retrieve data an attacker already holds.

Get AI Protection Plans from $7 per month. Cancel anytime.

How one breach can contribute to a larger exposure footprint

A possible risk pattern, not a description of this incident. Each step is something that can happen after a breach. Nothing here states that it has happened with data from this incident.

Illustrative pattern
  1. Step 1

    One breach

    A single company's records are accessed without authorization.

  2. Step 2

    Personal information is exposed

    Some categories can be changed afterward. Others, like a name or date of birth, can't.

  3. Step 3

    It may remain accessible

    Copies of breached data can persist well beyond the original incident.

  4. Step 4

    Sources can be combined

    Fragments from different breaches and public sources may be assembled into a fuller profile.

  5. Step 5

    More targeted attempts

    A fuller profile can make fraud, impersonation, phishing, or social engineering attempts more convincing.

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A breach is an event. Exposure can last longer.

A password can be reset and a card reissued. Some information can't be replaced, and that is the part that stays useful to someone attempting fraud later. This does not mean fraud will occur. It means the risk does not close when the news cycle does.

Involved in this breach and hard to change

Physical addressMay have been exposed
Date of birthMay have been exposed
Social Security numberMay have been exposed
Government identificationMay have been exposed
Health informationMay have been exposed
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What Advantest America, Inc. has done so far

Only actions the company has announced or that are documented in the sources below. If something you'd expect to see isn't here, it hasn't been announced as of the last update.

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Sources

Primary sources first: company disclosures, regulator and attorney general filings, SEC filings, court documents. News reporting is listed as secondary. Where reports conflict, the conflict is noted in the "What happened" section rather than resolved silently.

Primary 01
Advantest Corporation, via California Attorney General · October 6, 2026
Primary 02
California Attorney General · October 5, 2026
Primary 03
Advantest Corporation · February 19, 2026
Primary 04
Advantest Corporation · March 4, 2026
Primary 05
Office of the Vermont Attorney General · October 5, 2026

Last updated October 6, 2026 · First published October 6, 2026

Questions about the Advantest America, Inc. breach

Advantest Corporation, a semiconductor test equipment maker, is mailing Notice of Data Breach letters to people whose personal information was taken in a cybersecurity incident. Its U.S. subsidiary, Advantest America, Inc., filed a sample of the letter (dated October 6, 2026) with the California Attorney General on October 5, 2026, listing January 23, 2026 as the date of the breach. Vermont's Attorney General table also lists Advantest America, Inc. as of October 5, 2026 (8 Vermont residents; Social Security numbers, financial account codes, and credit and debit account information).

The company has not disclosed how many people were affected. Vermont AG table lists 8 Vermont residents; Advantest has not published a total number of people affected.

Unauthorized access is reported to have occurred On or about January 23, 2026.

The company says it discovered the breach on February 15, 2026. It disclosed the incident publicly on February 19, 2026.

The company has not confirmed which categories were exposed. May have been exposed: Physical address, Phone number, Email address, Date of birth, Social Security number, Government identification, Health information, Financial information, Other personal information. See the full list with status labels above.

The most reliable way is a notice from Advantest America, Inc. itself. The company has not said how or when it will notify affected individuals. Be cautious of unsolicited messages claiming to confirm you were affected; verify through a contact method you already have.

Start with the checklist above: follow the company's instructions, watch for phishing that references the breach, monitor the affected accounts, and consider a credit freeze if identifiers like a Social Security number are confirmed involved.

The company reports notifying affected individuals October 6, 2026.

Yes. Information that can't be changed, such as a name, date of birth, or Social Security number, can remain useful for fraud attempts long after the incident. That is a general risk, not a statement that data from this breach has been used.

AI Protection is an identity protection service that includes identity monitoring, removal of exposed information, restoration support, up to $5m in identity theft insurance per person, social media monitoring. It is independent of Advantest America, Inc. and cannot reverse a breach.
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