Personalis, Inc. Reports Data Breach Affecting 650 Individuals
On February 4, 2026, Personalis, Inc., a Fremont, California-based biotechnology company specializing in cancer genomics and sequencing, disclosed a data breach to the U.S. Department of Health and Human Services (HHS). The incident, classified as a hacking/IT breach, impacted 650 individuals across the United States.
While the exact method of intrusion and responsible party remain undisclosed, the exposed data may have included personally identifiable information (PII) and protected health information (PHI), such as names, addresses, dates of birth, contact details, and potentially medical or genetic data. No specific data types have been officially confirmed.
Personalis has not released further technical details about the breach but has advised affected individuals to monitor accounts for suspicious activity, review healthcare statements, and remain cautious of phishing attempts or identity theft risks. The company may provide additional notifications or support services, including credit monitoring, as part of its response.
Source: https://www.claimdepot.com/data-breach/personalis-2026
Personalis, Inc. TPRM report: https://www.rankiteo.com/company/personalis-inc
"id": "per1770921230",
"linkid": "personalis-inc",
"type": "Breach",
"date": "2/2026",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': '650',
'industry': 'Biotechnology (Cancer Genomics and '
'Sequencing)',
'location': 'Fremont, California, USA',
'name': 'Personalis, Inc.',
'type': 'Company'}],
'customer_advisories': 'Advised affected individuals to monitor accounts for '
'suspicious activity, review healthcare statements, '
'and remain cautious of phishing attempts or identity '
'theft risks.',
'data_breach': {'number_of_records_exposed': '650',
'personally_identifiable_information': 'Names, addresses, '
'dates of birth, '
'contact details, and '
'potentially medical '
'or genetic data',
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Personally identifiable '
'information (PII)',
'Protected health information '
'(PHI)']},
'date_publicly_disclosed': '2026-02-04',
'description': 'Personalis, Inc., a Fremont, California-based biotechnology '
'company specializing in cancer genomics and sequencing, '
'disclosed a data breach to the U.S. Department of Health and '
'Human Services (HHS). The incident, classified as a '
'hacking/IT breach, impacted 650 individuals across the United '
'States. The exposed data may have included personally '
'identifiable information (PII) and protected health '
'information (PHI), such as names, addresses, dates of birth, '
'contact details, and potentially medical or genetic data.',
'impact': {'data_compromised': 'Personally identifiable information (PII) and '
'protected health information (PHI), such as '
'names, addresses, dates of birth, contact '
'details, and potentially medical or genetic '
'data',
'identity_theft_risk': 'High'},
'investigation_status': 'Ongoing',
'references': [{'source': 'U.S. Department of Health and Human Services '
'(HHS)'}],
'regulatory_compliance': {'regulations_violated': ['HIPAA'],
'regulatory_notifications': 'Disclosed to the U.S. '
'Department of Health '
'and Human Services '
'(HHS)'},
'response': {'communication_strategy': 'Advised affected individuals to '
'monitor accounts for suspicious '
'activity, review healthcare '
'statements, and remain cautious of '
'phishing attempts or identity theft '
'risks. May provide additional '
'notifications or support services, '
'including credit monitoring.'},
'title': 'Personalis, Inc. Data Breach Affecting 650 Individuals',
'type': 'Data Breach'}