HackingTransportation & LogisticsTransportationData ExfiltratedEmployee Data InvolvedFinancial accountHealth (basic)Identity (basic)Government IDPCIPHIMediumContained

YELLOW CORPORATION

bd_1b4409988dd125be · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 27, 2025

Filed

Jun 26, 2026

To disclose

15 months

Affected

491state residents only

Linked

9 filings

Confidence

64%

Full breach record for YELLOW CORPORATION →

Yellow Corporation identified suspicious activity on its network on March 27, 2025, discovering that files were accessed and exfiltrated without permission on that date. The affected data may include names, SSNs, driver's license numbers, financial account numbers, and medical/health insurance information. The substantial majority of affected individuals are former employees. Yellow engaged third-party cybersecurity specialists, took systems offline, restored from backups, and implemented additional technical safeguards. No specific count of affected individuals was disclosed.

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Massachusetts clock✗ MA AG >90d15 months discovery → filing

Incident timeline

discovery → filing · 15 months / 456 days

Mar 27, 2025

Begins

Mar 27, 2025

Discovered

Jun 26, 2026

Filed

This filing is one of 9 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (8) · sorted by filing gap

New Hampshire State AGbd_02ca38c55dca01572026-06-26Verified
Indiana State AGbd_25143fe3a8be2bc12026-06-26Verified
Nebraska State AGbd_47a170a06047880f2026-06-26Verified
California State AGbd_599e40dc7dee10872026-06-26Verified

Show 4 more filings ↓up to 25d gap

South Carolina State AGbd_c2e30e440f2ff96c2026-06-26Candidate
Texas State AGbd_d6742a202bfb3dfb2026-06-30 · +4dVerified
Oregon State AGbd_cd729262a7431f712026-07-08 · +12dVerified
Illinois State AGbd_040097e5b8b9a3032026-06-01 · +25dVerified

Name: YELLOW CORPORATION
norm: yellow
Domain: www.myyellow.com

Name: YELLOW CORPORATION
norm: yellow
Domain: www.myyellow.com
Industry: Transportation & Logisticsllm

Discovered: Mar 27, 2025
Breach occurred: Mar 27, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 26, 2026
Affected individuals: 491state-resident count only
Data types: Financial accountHealth (basic)Identity (basic)Government IDPCIPHI
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notifying relevant regulators where necessary

During the incident: Launched an investigation with the assistance of third-party cybersecurity specialists
Briefly took the systems offline
Securely restored them from backups
Undertook a comprehensive review of the files to determine what information was contained in them
Implemented additional technical safeguards to mitigate the reoccurrence of this type of event
Changes made: Implemented additional technical safeguards to mitigate the reoccurrence of this type of event
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 15 months(456 days from discovery to filing)
Compliance flags: MA AG >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 9 states

View merged incident ↗

Illinois State AGJun 1 · first

New Hampshire State AG+25d

Indiana State AG+25d

Nebraska State AG+25d

California State AG+25d

South Carolina State AG+25d

Massachusetts State AG+25d · this page

Texas State AG+29d

Oregon State AG+37d

Pattern: first filing Jun 1 (IL), last Jul 8 (OR) — a 37-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/2026-1038-yellow-corporation/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 26, 2026
Raw hash: 72708cfebc6ff89fb96b9aa00f570cdf67f6e5180fe73d2d3701dde06e7e4f0e

Linked disclosures

Regulatory filings (8) · sorted by filing gap

Reporting entityYELLOW CORPORATION

Victim entityYELLOW CORPORATION

Incidentdiscovered Mar 27, 2025

Stated responseLaunched an investigation with the assistance of third-party cybersecurity specialists

ComplianceMA AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov