Brown Advisory LLC Reports Data Breach Affecting 134 Massachusetts Residents On January 21, 2026, Maryland-based investment management firm Brown Advisory LLC disclosed a data breach involving unauthorized access to sensitive systems. The incident, reported to the Massachusetts Office of Consumer Affairs and Business Regulation, exposed personally identifiable information (PII) of at least 134 individuals in Massachusetts. The breach did not disrupt the firm’s internal operations, client investments, or trading activities. However, the compromised data included names, phone numbers, email and home addresses, Social Security numbers, driver’s license and passport images, and financial account numbers. A forensic investigation, conducted with cybersecurity experts, confirmed that the threat actor did not access investment or trading data, though the scope of exposed PII remains significant. In response, Brown Advisory is offering 24 months of complimentary identity protection and credit monitoring through Experian IdentityWorks, which includes daily credit report monitoring, identity restoration support, and up to $1 million in identity theft insurance. Affected individuals have until June 30, 2026, to enroll in the service. The firm has also advised impacted parties to monitor account statements and credit reports for suspicious activity.