People search Premera data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 2 Premera-linked incidents, with headline counts up to 11M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Premera breach history matters
Premera operates in Technology. Across indexed rows, recurring themes include mixed intrusion and disclosure events. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2015 — — Premera: Premera Blue Cross notified customers of a data…
Cataloged incident. Premera Blue Cross notified customers of a data breach of their system by a cyberattack that compromised medical, personal and financial data of 11 million customers.The information compromised included medical information, bank account numbers, Social Security numbers, birth dates, names, addresses and other personal information. About six million of the people whose accounts were affected are residents of Washington state, where customers include employees of Amazon.com, Microsoft and Starbu Exposed categories include Personal information. BreachHistory cites approximately 11M+ affected records in this row. See the premera2015 and canonical BreachHistory entry.
2015 — — Premera: Detected 29th Jan 2015, 11.0M records
Unverified claim — treat actor counts cautiously. Detected 29th Jan 2015. Occured May 2014. C could include names, date of birth, email address, address, telephone number, Social Security number, member identification numbers, bank account information, and claims information, including clinical information BreachHistory cites approximately 11M+ affected records in this row. See the premerau and canonical BreachHistory entry.
Patterns and analysis
- Mixed intrusion and disclosure events — appears across multiple Premera catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Review OAuth app permissions and revoke unused third-party integrations.
- Step 5: Bookmark the Premera company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/premera · Latest: premera2015.
Sources: BreachHistory catalog (2 rows for Premera), company and regulator disclosures cited in individual breach records.