Gerson Lehrman Group

Disclosed Mar 12, 2024Confirmed

What is known

People affected	Not stated in the sources we have
Disclosed	Mar 12, 2024
Discovered	Nov 12, 2023
Happened	Nov 12, 2023
Attack	Ransomware
Data exposed	Not stated
Sector	Other · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Gerson Lehrman Group

Official noticeatg.wa.gov

Washington Attorney General breach notice: Gerson Lehrman Group

Official noticejustice.oregon.gov

Oregon DOJ breach notice: Gerson Lehrman Group

Official noticeago.vermont.gov

Vermont Attorney General: 2024-03-12 Gerson Lehrman Group Data Breach Notice to Consumers

Official noticein.gov

Indiana Attorney General 2024 data breach report: Gerson Lehrman Group

Notices filed

Residents of CAMar 12, 2024

California AGCount not stated

Residents of WAMar 12, 2024

Washington AG3,734 people

Residents of ORMar 12, 2024

Oregon DOJCount not stated

Residents of VTMar 12, 2024

Vermont AGCount not stated

Residents of INMar 12, 2024

Indiana AG1,833 people

History of this record

source2026-09-25

empty to https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/files/DB-Year-to-Date-Reportdec-2024.pdfby backfillSource

source2026-09-25

empty to https://ago.vermont.gov/document/2024-03-12-gerson-lehrman-group-data-breach-notice-consumersby backfillSource

attack2026-09-25

unknown to ransomwareby backfillSource

discovered2026-09-25

empty to 2023-11-12by 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.

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