HackingFinancial ServicesFinanceStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

BROWN ADVISORY LLC

bd_f8089bdce822f18b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 21, 2026

Filed

Mar 3, 2026

To disclose

6 weeks

Affected

Not disclosed

Linked

5 filings

Confidence

66%

Full breach record for BROWN ADVISORY LLC →

Brown Advisory LLC notified Massachusetts residents of a security incident discovered on January 21, 2026, involving unauthorized access by a threat actor to certain systems. The incident impacted personal information including names, contact details, Social Security numbers, driver's license/passport images, and financial account numbers. The company engaged cybersecurity experts, notified law enforcement, contained the incident, and reset credentials. No evidence of access to client investments was found. 24 months of credit monitoring is offered.

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Massachusetts clock⏱ MA AG >30d6 weeks discovery → filing

Incident timeline

discovery → filing · 6 weeks / 41 days

Jan 21, 2026

Discovered

Mar 3, 2026

Filed

vs. sector median

3 wks faster

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Maine State AGbd_c2af09a2f3da680e2026-03-03Candidate
Indiana State AGbd_eb8eb0cf17c4217c2026-03-03Verified
Washington State AGbd_f9e698b7a0b50df12026-03-03Verified
New Hampshire State AGbd_dababfc4892eacd62026-03-06 · +3dVerified

Name: BROWN ADVISORY LLC
norm: brown advisory
Domain: brownadvisory.com

Name: BROWN ADVISORY LLC
norm: brown advisory
Domain: brownadvisory.com
Industry: Financial Servicesllm

Discovered: Jan 21, 2026
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External

During the incident: Engaged leading cybersecurity experts
Initiated an investigation to understand the scope and nature of the incident
Taken steps to contain it
Notified law enforcement
Resetting passwords and session tokens for the known compromised account
Changes made: Offering 24 months of identity protection services and credit monitoring from Experian at no charge
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(41 days from discovery to filing)
Compliance flags: MA AG >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Maine State AGMar 3 · first

Indiana State AGMar 3 · first

Washington State AGMar 3 · first

Massachusetts State AGMar 3 · first · this page

New Hampshire State AG+3d

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.mass.gov/doc/2026-315-brown-advisory-llc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 3, 2026
Raw hash: fd3da8e4b6ac6f854edcb2303e0e1c5716220dc6efd2af0a203b315c2c414fdb

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityBROWN ADVISORY LLC

Victim entityBROWN ADVISORY LLC

Incidentdiscovered Jan 21, 2026

Stated responseEngaged leading cybersecurity experts

ComplianceMA AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov