MalwareProfessional ServicesProfessional ServicesRansomwareData EncryptedCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)Government IDLowContained

ARTHUR J. GALLAGHER & CO.

bd_d803a85bda006f93 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 26, 2020

Filed

Jun 30, 2021

To disclose

40 weeks

Affected

Not disclosed

Linked

41 filings

Confidence

65%

Full breach record for ARTHUR J. GALLAGHER & CO. →14 incidents on file

Arthur J. Gallagher & Co. disclosed a ransomware incident affecting internal systems between June 3, 2020, and September 26, 2020. The company took systems offline, engaged forensic specialists, and confirmed the exposure of personal information (PII) belonging to certain individuals. The breach was discovered on September 26, 2020, and notifications were sent in July 2021. Affected data included names and other personal identifiers. The company provided 24 months of credit monitoring via Kroll.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 115 days

discovery → filing · 40 weeks / 277 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Jun 30, 2021

Filed

vs. sector median

+20 wks slower

This filing is one of 41 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Delaware State AGbd_d559ecce5b3385332021-08-19 · +50dVerified by operator
New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +54dVerified by operator
Maine State AGbd_a45fd1cf66fc40d52021-09-01 · +63dVerified by operator
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +69dVerified by operator

Show 6 more filings ↓up to 163d gap

Maine State AGbd_c453899ab04861cb2021-09-08 · +70dVerified by operator
Maine State AGbd_29bb498af183cd332021-09-13 · +75dVerified by operator
Maine State AGbd_d79b29bc558a3c712021-09-29 · +91dVerified by operator
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +96dVerified by operator
Maine State AGbd_2831d3281e5d09eb2021-12-06 · +159dCandidate
New Hampshire State AGbd_0995d36ed3507f492021-12-10 · +163dVerified

Showing first 10 of 40 linked disclosures.

Name: ARTHUR J. GALLAGHER & CO.
norm: arthur j gallagher

Name: ARTHUR J. GALLAGHER & CO.
norm: arthur j gallagher
Industry: Professional Servicesllm

Discovered: Sep 26, 2020
Breach occurred: Jun 3, 2020 – Sep 26, 2020
Undetected for: 115 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 1, 2021
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: reported this incident to law enforcement and regulatory authorities

During the incident: Took all our systems offline as a precautionary measure
Initiated response protocols
Launched an investigation with the assistance of third-party cybersecurity and forensic specialists
Implemented our business continuity plans to minimize disruption to our customers
Ensured the ongoing security of our systems
Reported this incident to law enforcement and regulatory authorities
Providing you access, at no cost, to identity and credit monitoring services for twenty-four months through Kroll
Changes made: Reviewed existing security policies and implemented additional measures and enhanced security tools
Implemented additional safeguards
Providing additional training to our employees on data privacy and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 40 weeks(277 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 3 states

View merged incident ↗

Delaware State AGJun 30 · first · this page

Delaware State AG+50d

New Hampshire State AG+54d

Maine State AG+63d

New Hampshire State AG+69d

Maine State AG+70d

Maine State AG+75d

Maine State AG+91d

New Hampshire State AG+96d

Maine State AG+159d

New Hampshire State AG+163d

Pattern: first filing Jun 30 (DE), last Dec 10 (NH) — a 163-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 40 — the full spread may be wider.

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://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2021/07/AJG-Data-Breach-Notice.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 30, 2021
Raw hash: 1cc89dc9f73ad62bbe92c8eb3cad99178dc656d23220e5421629a58c4528a35d

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityARTHUR J. GALLAGHER & CO.

Victim entityARTHUR J. GALLAGHER & CO.

Incidentdiscovered Sep 26, 2020

Stated responseTook all our systems offline as a precautionary measure

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceattorneygeneral.delaware.gov