HackingManufacturingManufacturingData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Diamond Chemical Co, LLC

bd_22c10446cef5bf09 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 2, 2025

Filed

May 5, 2026

To disclose

35 weeks

Affected

1state residents only

Linked

5 filings

Confidence

65%

Full breach record for Diamond Chemical Co, LLC →

Diamond Chemical Co, LLC notified the New Hampshire Attorney General of a data event affecting one NH resident. Unauthorized access occurred between July 26, 2025, and September 2, 2025, involving unauthorized copying of files containing names and Social Security Numbers. The company notified law enforcement, engaged third-party specialists, and provided 12 months of credit monitoring through Kroll.

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Incident timeline

undetected · 38 days

discovery → filing · 35 weeks / 245 days

Jul 26, 2025

Begins

Sep 2, 2025

Discovered

May 5, 2026

Filed

vs. sector median

+24 wks slower

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

Massachusetts State AGbd_0f61c03452e262182026-05-05Candidate
Maine State AGbd_307f772b015554692026-05-05Verified
Vermont State AGbd_8ccfe8ade1a101ad2026-05-05Verified
Indiana State AGbd_b3fb986e92f2d2672026-05-05Verified

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: Diamond Chemical Co, LLC
norm: diamond chemical
Industry: Manufacturingllm

Discovered: Sep 2, 2025
Breach occurred: Jul 26, 2025 – Sep 2, 2025
Undetected for: 38 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 5, 2026
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Initial access: valid_credentials

During the incident: Began an investigation with the assistance of third-party specialists
Undertook a thorough review of the files
Notified federal law enforcement
Providing access to credit monitoring services for twelve (12) months, through Kroll
Changes made: Reviewing its protocol, policies, and procedures in an attempt to reduce the likelihood of a similar event reoccurring
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 35 weeks(245 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Massachusetts State AGMay 5 · first

Maine State AGMay 5 · first

Vermont State AGMay 5 · first

Indiana State AGMay 5 · first

New Hampshire State AGMay 5 · first · this page

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://mm.nh.gov/files/uploads/doj/remote-docs/diamond-chemical-20260505.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 5, 2026
Raw hash: f829dff81ed2e316c3746c1da4b64be1c0ae15d15f676ee70ef5b065524aba14

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entityDiamond Chemical Co, LLC

Incidentdiscovered Sep 2, 2025

Stated responseBegan an investigation with the assistance of third-party specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov