Janney Montgomery Scott LLC experienced a third-party data breach stemming from unauthorized access to the systems of Alation, a data intelligence platform vendor. Alation detected the unauthorized intrusion on August 18, 2026, and an investigation determined that unauthorized access occurred on August 10, 2026. Alation notified Janney on September 1, 2026, that certain client personal information had been accessed, and Janney confirmed the exposure on September 24, 2026.
The exposed information included full names, addresses, Social Security numbers, Tax Identification Numbers, and financial account numbers. A regulatory filing submitted to the Massachusetts Office of Consumer Affairs and Business Regulation on October 28, 2026, confirmed that at least two Massachusetts residents were impacted. The total number of affected individuals across other states has not been publicly released.
Janney issued written notification letters to affected clients in October 2026 offering credit monitoring services. Details regarding the full nationwide scope and exact total of impacted individuals remain subject to ongoing disclosures as additional state regulatory filings are finalized.