HackingProfessional ServicesProfessional ServicesSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Government IDFinancial accountHealth (basic)CriticalContained

Thompson & Horton LLP

bd_62dd0345ed0ce465 · schema v1 · pii pii-v1

Severity

Critical

Discovered

May 3, 2024

Filed

Oct 29, 2025

To disclose

18 months

Affected · nationwide

148,8848 in this filing

Linked

8 filings

Confidence

66%

Full breach record for Thompson & Horton LLP →

Thompson & Horton, LLP disclosed a cybersecurity incident where unauthorized access occurred to a server hosted by MSP 'All Covered' between April 13 and May 3, 2024. The breach affected approximately 148,884 individuals, exposing names, SSNs, driver's licenses, passport numbers, financial account info, and medical data. The firm engaged forensic specialists, notified law enforcement, and offered 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 20 days

discovery → filing · 18 months / 544 days

Apr 13, 2024

Begins

May 3, 2024

Discovered

Oct 29, 2025

Filed

vs. sector median

+60 wks slower

This filing is one of 8 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

Nebraska State AGbd_2920937e521821482025-10-29Verified
New Hampshire State AGbd_68dca34fb6031c4d2025-10-29Verified
Indiana State AGbd_b344e037d355f1a02025-10-29Verified
Vermont State AGbd_ca2da2865ef941c22025-10-29Verified

Show 3 more filings ↓up to 1d gap

Maine State AGbd_2460f839b22fc5042025-10-30 · +1dVerified
Massachusetts State AGbd_67012f31f4f0f1c02025-10-30 · +1dVerified
Texas State AGbd_71c2bdcabc3a48a72025-10-30 · +1dVerified

Name: Thompson & Horton LLP
norm: thompson horton

Name: Thompson & Horton LLP
norm: thompson horton
Industry: Professional Servicesllm

Discovered: May 3, 2024
Breach occurred: Apr 13, 2024 – May 3, 2024
Undetected for: 20 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 29, 2025
Affected individuals: 148,884state + nationwide
Data types: Identity (basic)Government IDFinancial accountHealth (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1078 Valid Accounts
Threat actor: External
Regulator citations: Notified federal law enforcement
Third party: via All Covered
Initial access: supply_chain

During the incident: Engaged third-party forensic specialists to investigate this matter
Notified federal law enforcement
Reviewed our policies and procedures
Arranged for complimentary credit monitoring service for 24 months provided by Cyberscout
Changes made: Reviewed policies and procedures related to data protection
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 months(544 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 8 states

View merged incident ↗

Nebraska State AGOct 29 · first

New Hampshire State AGOct 29 · first

Indiana State AGOct 29 · first

Vermont State AGOct 29 · first

Montana State AGOct 29 · first · this page

Maine State AG+1d

Massachusetts State AG+1d

Texas State AG+1d

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://dojmt.gov/wp-content/uploads/2025/11/Consumer-notification-letter-3.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 29, 2025
Raw hash: 46009665e7462f858f885c7f14900914d5f4a1b8fb36e0ccc2a745d409082803

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityThompson & Horton LLP

Victim entityThompson & Horton LLP

Incidentdiscovered May 3, 2024

Stated responseEngaged third-party forensic specialists to investigate this matter

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov