HackingFinancial ServicesFinanceData ExfiltratedCustomer Data InvolvedPIIIdentity (basic)LowContained

Beacon Mutual Insurance

bd_9212ea1e5259bdac · schema v1 · pii pii-v1

Severity

Low

Discovered

Jan 14, 2026

Filed

May 18, 2026

To disclose

18 weeks

Affected

Not disclosed

Linked

11 filings

Confidence

65%

Full breach record for Beacon Mutual Insurance →

The Beacon Mutual Insurance Company notified the California Attorney General of a data security incident. An unauthorized person gained access to systems between January 7 and January 14, 2026, and acquired copies of files. The company detected the activity on January 14, 2026, contained it, and reported it to law enforcement. A review completed on April 16, 2026, determined that certain files contained personal information. The company is offering free identity monitoring services to affected individuals.

J jump to incidentP pin to compareR raw source

California clockDiscovered Jan 14, 2026 → Notified May 18, 2026124d ✗ CA 30-day late18 weeks discovery → filing

Incident timeline

undetected · 7 days

discovery → filing · 18 weeks / 124 days

Jan 7, 2026

Begins

Jan 14, 2026

Discovered

May 18, 2026

Filed

vs. sector median

+8 wks slower

This filing is one of 11 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Siteinc_ransombd_da7048f19e46b32f2026-01-31 · +107dVerified by operator
Leak Siteinc_ransombd_5b90158bd9f951672026-01-14 · +124dVerified by operator

Regulatory filings (8) · sorted by filing gap

Massachusetts State AGbd_5d7dc416180d53c82026-05-18Verified by operator
Montana State AGbd_88cdbba0a563b7f12026-05-18Verified
Vermont State AGbd_8abe1f6930c743e62026-05-18Verified by operator
Indiana State AGbd_96f08282e4c86e4a2026-05-18Verified by operator

Show 4 more filings ↓up to 1d gap

Nebraska State AGbd_acbc06cd15404c7b2026-05-18Verified
Maine State AGbd_e4cb15dcb1bd517c2026-05-18Verified by operator
New Hampshire State AGbd_ffd3dfb51f7f7e862026-05-18Verified by operator
Texas State AGbd_a561b8d222dfacc42026-05-19 · +1dVerified

Name: Beacon Mutual Insurance
norm: beacon mutual insurance
Domain: beaconmutual.com

Name: Beacon Mutual Insurance
norm: beacon mutual insurance
Domain: beaconmutual.com
Industry: Financial Servicesllm

Discovered: Jan 14, 2026
Breach occurred: Jan 7, 2026 – Jan 14, 2026
Undetected for: 7 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 18, 2026
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Reported the incident to law enforcement

During the incident: Took action to contain the unauthorized activity
Began an investigation
Reported the incident to law enforcement
Offering a free membership with Experian IdentityWorks
Changes made: Taken steps to enhance the security of our computer network
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 weeks(124 days from discovery to filing)
Compliance flags: CA 30-day late · 124dLeak >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Jan 14, 2026
→ Notified: May 18, 2026
124d 30 calendar days CA 30-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Jan 14, 2026 → Notified: May 18, 2026	124d	30 calendar days	CA 30-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 9 states

View merged incident ↗

Massachusetts State AGMay 18 · first

Montana State AGMay 18 · first

Vermont State AGMay 18 · first

Indiana State AGMay 18 · first

Nebraska State AGMay 18 · first

Maine State AGMay 18 · first

New Hampshire State AGMay 18 · first

California State AGMay 18 · first · this page

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://oag.ca.gov/ecrime/databreach/reports/sb24-623604
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 18, 2026
Raw hash: 8d822b417fbcdcf1a1d8dce033636b91ad80b792fae72882e6e75be4b3e42445

Linked disclosures

Ransomware claims (2)

Regulatory filings (8) · sorted by filing gap

Reporting entityBeacon Mutual Insurance

Victim entityBeacon Mutual Insurance

Incidentdiscovered Jan 14, 2026

Stated responseTook action to contain the unauthorized activity

ComplianceCA 30-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov