HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Alten Sakai & Co. LLP

bd_3cde9957b997f78b · schema v1 · pii pii-v2

Severity

Medium

Discovered

May 19, 2025

Filed

Jul 28, 2025

To disclose

—

Affected

2state residents only

Linked

3 filings

Confidence

67%

Full breach record for Alten Sakai & Co. LLP →3 incidents on file

Alten Sakai & Co. LLP, an accounting firm, reported a data security incident to the Nebraska Attorney General on July 28, 2025. On May 19, 2025, suspicious activity was discovered, leading to unauthorized access to systems storing personal tax-related information. Two Nebraska residents were affected. Impacted data included names, addresses, SSNs, driver's license numbers, dates of birth, and bank account information. Alten Sakai engaged external cybersecurity experts, changed passwords, deployed enhanced security tools, and offered 12 months of credit monitoring via TransUnion/Cyberscout. Law enforcement was notified.

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Incident timeline

May 19, 2025

Discovered

Jul 28, 2025

Filed

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Oregon State AGbd_63526b6ce692b4c92025-07-28Candidate
Montana State AGbd_df5c0f939673c7b42025-07-28Verified

Name: Alten Sakai & Co. LLP
norm: alten sakai

Name: Alten Sakai & Co. LLP
norm: alten sakai
Industry: Professional Servicesllm

Discovered: May 19, 2025
Materiality determined: —
Notification sent: Jul 28, 2025
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified the FTCNotified and is cooperating with law enforcement
Initial access: valid_credentials

During the incident: Implemented its incident response protocols
Engaged external cybersecurity experts to assist with conducting an investigation
Changed passwords
Deployed enhanced security tools throughout their IT environment
Implemented other security controls
Offered 12 months of credit monitoring and identity protection services through TransUnion
Deployed endpoint detection and threat monitoring software on all endpoints
Notified and is cooperating with law enforcement
Changes made: Deployed endpoint detection and threat monitoring software on all endpoints
Changed all passwords
Deployed enhanced security tools throughout our IT environment
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 · 3 filings · 3 states

View merged incident ↗

Oregon State AGJul 28 · first

Montana State AGJul 28 · first

Nebraska State AGJul 28 · 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://nebraska.gov/ago/data-breach/documents/5688af55-2207-4efe-843a-9f4327b54deb.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 28, 2025
Raw hash: 1683ee1241894c4b88882b3ccd20bbb97a0fe13821d628f9c979e0167e1d8a1f

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityAlten Sakai & Co. LLP

Victim entityAlten Sakai & Co. LLP

Incidentdiscovered May 19, 2025

Stated responseImplemented its incident response protocols

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov