Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Regeneron Pharmaceuticals

Disclosed May 22, 20241,199,605 affectedConfirmed

Official notice

What is known

People affected1,199,605 (as reported by the organization)
DisclosedMay 22, 2024
DiscoveredApr 10, 2024
HappenedFeb 21, 2024
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Regeneron Pharmaceuticals
Official noticeatg.wa.gov
Washington Attorney General breach notice: Regeneron Pharmaceuticals
Official noticeattorneygeneral.delaware.gov
Notice letter filed with the Delaware DOJ: Regeneron Pharmaceuticals
Official noticeago.vermont.gov
Vermont Attorney General: 2024-05-22 Regeneron Pharmaceuticals Data Breach Notice to Consumers

Notices filed

Residents of CAMay 22, 2024
California AGCount not stated
Residents of WAMay 22, 2024
Washington AG13,958 people
Residents of DEMay 22, 2024
Delaware DOJ6,367 people
Residents of VTMay 22, 2024
Vermont AGCount not stated
History of this record
source2026-09-25
empty to https://ago.vermont.gov/document/2024-05-22-regeneron-pharmaceuticals-data-breach-notice-consumersby backfillSource
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 1199605by backfillSource
attack2026-09-25
unknown to hackingby backfillSource
discovered2026-09-25
empty to 2024-04-10by backfillSource
Added2026-09-25
First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

Everything about Regeneron Pharmaceuticals