HackingCapture Stored DataData ExfiltratedCustomer Data InvolvedPIILowContained

Lyon Management Group, Inc.

bd_032cbe3b69a97abc · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Mar 28, 2025

To disclose

—

Affected

Not disclosed

Linked

4 filings

Confidence

66%

Full breach record for Lyon Management Group, Inc. →

Lyon Management Group, Inc. experienced unauthorized access to its IT network between March 14–15, 2024, during which an unknown actor potentially copied files containing personal information. The company secured its systems, conducted a forensic investigation, notified federal law enforcement, and offered complimentary credit monitoring and identity restoration services through TransUnion. Notice letters were sent on or around March 28, 2025.

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Incident timeline

Mar 14, 2024

Begins

Mar 28, 2025

Filed

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Massachusetts State AGbd_3f0de297348acb892025-03-28Verified
Indiana State AGbd_143a112921db97852025-01-29 · +58dVerified
Maryland State AGbd_8d7dfd8fd9b8b74c2025-01-29 · +58dVerified

Name: Lyon Management Group, Inc.
norm: lyon management

Name: Lyon Management Group, Inc.
norm: lyon management

Discovered: —
Breach occurred: Mar 14, 2024 – Mar 15, 2024
Materiality determined: —
Notification sent: Mar 28, 2025
Affected individuals: Not disclosed
Data types: PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1119 Automated CollectionT1074 Data Staged
Threat actor: External
Regulator citations: Notified federal law enforcement

During the incident: Promptly began an investigation to determine the nature and scope of the event
Took steps to secure our network
Notified federal law enforcement
Offering 12/24 months of complimentary credit monitoring and identity restoration services through TransUnion
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGJan 29 · first

Maryland State AGJan 29 · first

Massachusetts State AG+58d

California State AG+58d · this page

Pattern: first filing Jan 29 (IN), last Mar 28 (CA) — a 58-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://oag.ca.gov/ecrime/databreach/reports/sb24-600563
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 28, 2025
Raw hash: 763cd8c97d77bc18826f7a7b32a327c991c264064680b485f97fdb5d113ea865

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityLyon Management Group, Inc.

Victim entityLyon Management Group, Inc.

IncidentUnauthorized Access

Stated responsePromptly began an investigation to determine the nature and scope of the event

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov