HackingConstructionConstructionCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDMediumContained

Williams Brothers Construction

bd_b17876e5db38570a · schema v1 · pii pii-v2

Severity

Medium

Discovered

Jan 10, 2026

Filed

Aug 19, 2026

To disclose

32 weeks

Affected

2state residents only

Linked

2 filings

Confidence

66%

Full breach record for Williams Brothers Construction →2 incidents on file

Williams Brothers Construction Co., Inc. detected unauthorized network activity on January 10, 2026. Investigation determined unauthorized access occurred between January 10-11, 2026, affecting approximately 2 New Hampshire residents. Data exposed included names and Social Security numbers. The company engaged third-party cybersecurity experts, secured systems, and is offering one year of complimentary credit monitoring. Notifications were sent on August 19, 2026.

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Incident timeline

discovery → filing · 32 weeks / 221 days

Jan 10, 2026

Begins

Jan 10, 2026

Discovered

Aug 19, 2026

Filed

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_16ba84380ebd5c422026-08-01 · +18dCandidate

Name: Williams Brothers Construction Co., Inc.
norm: williams brothers construction

Name: Williams Brothers Construction
norm: williams brothers construction
Domain: williamsbrothersconstruction.com
Industry: Constructionllm

Discovered: Jan 10, 2026
Breach occurred: Jan 10, 2026 – Jan 11, 2026
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 19, 2026
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unknown
Threat actor: External
Regulator citations: Notified the Attorney General of the State of New Hampshire

During the incident: Ensured the security of its systems
Commenced a prompt and thorough investigation
Working very closely with external cybersecurity professionals experienced in handling these types of incidents
Conducted an extensive review of the impacted data
Providing the affected residents with written notification of this incident commencing on or about August 19, 2026
Advising the affected residents about the process for placing fraud alerts and/or security freezes on their credit files and obtaining free credit reports
Offering complimentary credit monitoring for one year
Changes made: Strengthened our network
Implemented additional security improvements recommended by third-party cyber security experts
Continually evaluate and modify its practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 32 weeks(221 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGAug 1 · first

New Hampshire State AG+18d · this page

Pattern: first filing Aug 1 (MA), last Aug 19 (NH) — a 18-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://mm.nh.gov/files/uploads/doj/remote-docs/williams-brothers-construction-20260819.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 19, 2026
Raw hash: 04836f23bdf44713ca347f115570effac78b3228b0e9f01f40c44095ef1a15cc

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityWilliams Brothers Construction Co., Inc.

Victim entityWilliams Brothers Construction

Incidentdiscovered Jan 10, 2026

Stated responseEnsured the security of its systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov