Guardant Health, Inc.

Guardant Health, Inc. notified California AG on May 3, 2024 of a data breach, which occurred on Feb 29, 2024. Data exposed: Social Security number, Financial / bank account, Medical / health information, Postal address, Name.

Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization: Guardant Health, Inc.
Source: California AG · source record
Date reported: May 3, 2024
Date(s) of breach: Monday, October 5, 2020Thursday, February 29, 2024
Residents affected: Not published by this source
Data exposed: Social Security number Financial / bank account Medical / health information Postal address Name
Notice letter: Sample notice (PDF)
Discovered: Mar 4, 2024, as stated in the letter
"The file was believed to have been transferred in October 2020, and on March 4, 2024, we were able to determine, based on a review of available records of activity, that the file was copied by unidentified third parties between September..."
Days to notice: 60 days from discovery (Mar 4, 2024) to the California record (May 3, 2024). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82). Over the statutory period
First seen by BreachTally: 2026-10-30 15:40 UTC

Dates and counts as filed by the organization with the agency. The breach window and the report date often differ by months.

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Data reproduced from a public government filing. Spot an error? Email support@breachtally.com with the record link. Corrections are applied and noted.