Clustered 4 filings across 3 jurisdictions · filing window Apr 26, 2024 → May 3, 2024. View entity profile → Other incidents for this victim →
incident inc_15345bb5a98f475c · merge_method deterministic · confidence 100%
Discovered → first regulatory filing
Range of discovered_at dates across filings
Time between earliest and latest filing
Not recorded for this incident
Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.
Identity (basic) · Health (basic) · PHI
CA MT VT
HHS OCR · State AG
Earliest sighting first · deep chronology in Litigation Timeline
Sep 8, 2023 → Feb 28, 2024
When the intrusion reportedly occurred, per the linked filings
Mar 4, 2024
Reported by VERMONT AG, CALIFORNIA AG filings
Guardant Health, Inc. reported to HHS on 2024-04-26 a Unauthorized Access/Disclosure affecting 9309 individuals. Breached information located on Network Server. A workforce member inadvertently made PHI (names, ages, medical record numbers, treatment info) viewable over the Internet. The entity notified HHS and individuals, sanctioned the employee, and implemented technical safeguards.
About this clustering
DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.
Affected (this filing): 9,309
Guardant Health, Inc. notified Vermont AG that an employee inadvertently made a file containing patient personal and medical information publicly accessible in October 2020. Unidentified third parties copied the file between September 2023 and February 2024. Data included names, ages, medical record numbers, and test results; no SSNs or financial data were involved.
Guardant Health, Inc reported a data breach to the Montana Attorney General. The breach was reported on 2024-05-03. The breach occurred from 9/8/2023 to 2/28/2024. 14 Montana residents were affected.
Affected (this filing): 14
Guardant Health, Inc. disclosed that a file containing personal and medical information (names, ages, medical record numbers, treatment info, test results) was inadvertently made publicly accessible on an online platform due to employee error. The file was transferred in October 2020 but discovered on March 4, 2024. Unidentified third parties copied the file between September 8, 2023, and February 28, 2024. No financial information or SSNs were involved. Guardant removed the file, investigated, and enhanced technical controls.