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Latest / California / June 2021

Highmark Inc.

Highmark Inc. notified California AG on Jun 24, 2021 of a data breach, which occurred on Dec 23, 2020. Data exposed: Medical / health information, Usernames / passwords, Email address.

Organization
Highmark Inc.
Source
California AG · source record
Date reported
Jun 24, 2021
Date(s) of breach
Wednesday, December 23, 2020
Residents affected
Not published by this source
Data exposed
Medical / health information Usernames / passwords Email address
Notice letter
Sample notice (PDF)
First seen by BreachTally
2026-10-30 16:06 UTC

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

Other filings by Highmark Inc.

OrganizationSourceStateReportedResidents affectedData exposed
Highmark, Inc. Delaware DOJ DE Feb 10, 2023 559 Social Security numberFinancial / bank accountMedical / health informationHealth insurance+6
Highmark California AG CA Feb 3, 2023 Not published Not stated
First seen by BreachTally at 16:06 UTC on Oct 30, 2026. New filings reach paid subscribers within 30 minutes of the agency posting, with the data types and the letter. Start a 14-day free trial.

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