Where does the Tokyo Electron U.S. Holdings case file come from?

Every entry is taken from the breach report Tokyo Electron U.S. Holdings lodged with the Oregon Attorney General. Nothing here is estimated.

Why do the incident date and the report date differ?

Companies usually investigate before they report. The gap between the two dates shows how long that took.

What does the records-affected figure count?

It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.

Does this case file change over time?

Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Case file

Case File: Tokyo Electron U.S. Holdings Data Breach

This file collects the dated facts on record for the Tokyo Electron U.S. Holdings incident. The state report is dated April 3, 2025.

Timeline

April 3, 2025Report filed in OregonDate the notice was lodged with the Oregon Attorney General.

Case facts

Filing state: Oregon
Date reported: April 3, 2025
Receiving office: Oregon Attorney General

Case notes

Tokyo Electron U.S. Holdings, a prominent technology firm specializing in semiconductor production equipment, officially filed a data security incident report with the Oregon Attorney General on April 3, 2025. This filing confirms that the company experienced unauthorized access to its internal systems.

The incident involves unauthorized access to the company's systems. While the specific nature of the data involved has not been detailed in public records, Tokyo Electron U.S. Holdings typically manages sensitive employee and business information. Individuals who received a direct notification letter from the company should understand that their personal information may have been affected.

At the time of this report, the company's investigation into the scope and impact of the breach is ongoing. Receiving a formal data breach notification letter means that the company has identified you as a potentially affected individual and is informing you about the security compromise.

If you are among those affected, it is advisable to remain vigilant for any unusual activity. Reviewing account statements and credit reports regularly can help detect potential misuse of your information. Consider placing a fraud alert or security freeze on your credit if you are concerned about identity theft.

This information is based on public filings made by Tokyo Electron U.S. Holdings with the Oregon Attorney General's office, documenting the security incident and its ongoing response.

Questions about this case file

Where does the Tokyo Electron U.S. Holdings case file come from?: Every entry is taken from the breach report Tokyo Electron U.S. Holdings lodged with the Oregon Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?: Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?: It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?: Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

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Timeline

Case facts

Case notes

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