HackingFinancial ServicesFinanceVulnerability ExploitTargetedData ExfiltratedIdentity (basic)Government IDFinancial accountHighContained

BROWN ADVISORY LLC

bd_c2af09a2f3da680e · schema v1 · pii pii-v1

Severity

High

Discovered

Jan 21, 2026

Filed

Mar 3, 2026

To disclose

6 weeks

Affected · nationwide

1,98014 in this filing

Linked

5 filings

Confidence

65%

Full breach record for BROWN ADVISORY LLC →

Brown Advisory LLC reported an external system breach (hacking) on January 21, 2026, affecting 1,980 individuals, including 14 Maine residents. The incident involved unauthorized access to personal data such as names, SSNs, driver's licenses, and financial account numbers. The company engaged cybersecurity experts, notified law enforcement, reset credentials, and is offering 24 months of Experian identity protection services.

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Maine clockDiscovered Jan 21, 2026 → Filed with AG Mar 3, 202641d ⏱ ME AG >30d6 weeks discovery → filing

⚠ occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Incident timeline

discovery → filing · 6 weeks / 41 days

Jan 21, 2026

Begins

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

Indiana State AGbd_eb8eb0cf17c4217c2026-03-03Verified
Massachusetts State AGbd_f8089bdce822f18b2026-03-03Verified
Washington State AGbd_f9e698b7a0b50df12026-03-03Verified
New Hampshire State AGbd_dababfc4892eacd62026-03-06 · +3dVerified

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

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

Discovered: Jan 21, 2026
Breach occurred: Jan 21, 2026
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 3, 2026
Affected individuals: 1,980state + nationwide
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: ExternalFinancial
Initial access: exploit_public_facing

During the incident: Engaged leading cybersecurity experts
Initiated an investigation
Took 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
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(41 days from discovery to filing)
Compliance flags: ME AG >30d · 41d
Discovery-date grounding: occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Jan 21, 2026
→ Filed with AG: Mar 3, 2026
41d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Jan 21, 2026 → Filed with AG: Mar 3, 2026	41d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Indiana State AGMar 3 · first

Massachusetts State AGMar 3 · first

Washington State AGMar 3 · first

Maine 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.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/aac37c55-b974-4522-80ce-317967214217.html
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: 623aaef97634a645622e50e006356414038109d2b7d9091fa1683ac9bd01ae77

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

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov