HackingConstructionConstructionCustomer Data InvolvedPIIIdentity (basic)LowContained

Williams Brothers Construction

bd_16ba84380ebd5c42 · schema v1 · pii pii-v2

Severity

Low

Discovered

Jan 10, 2026

Filed

Aug 1, 2026

To disclose

—

Affected

Not disclosed

Linked

2 filings

Confidence

65%

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

Williams Brothers Construction Company, Inc. detected unauthorized activity on its network on January 10, 2026. An investigation determined that unauthorized access occurred between January 10 and January 11, 2026. The company engaged third-party cybersecurity experts, secured its systems, and implemented additional security improvements. Affected individuals are being offered complimentary credit monitoring services.

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Incident timeline

Jan 10, 2026

Begins

Jan 10, 2026

Discovered

Aug 1, 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

New Hampshire State AGbd_b17876e5db38570a2026-08-19 · +18dVerified

Name: Williams Brothers Construction Company, Inc.
norm: williams brothers construction company
Domain: williams.com

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: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Unknown

During the incident: Ensured the security of our systems
Commenced a prompt and thorough investigation with the assistance of third-party cybersecurity experts
Conducted an extensive review of the impacted data
Strengthened our network and implemented additional security improvements recommended by third-party cyber security experts
Changes made: Strengthened our network and implemented additional security improvements recommended by third-party cyber security experts
Offering a complimentary membership for credit monitoring
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 · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGAug 1 · first · this page

New Hampshire State AG+18d

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://www.mass.gov/doc/2026-1388-williams-brothers-construction-co-inc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 1, 2026
Raw hash: 0fe0cbac154ee4cfa5285276a904504272f588e3574e5924e794ea8796348847

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityWilliams Brothers Construction Company, Inc.

Victim entityWilliams Brothers Construction

Incidentdiscovered Jan 10, 2026

Stated responseEnsured the security of our systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov