FEDERALItem 8.01 · voluntaryMisuseTechnologyInformationPrivilege AbuseData ExfiltratedCustomer Data InvolvedLowActive

ALT5 Sigma Corporation

bd_4fdb85f8c81fab23 · schema v1 · pii pii-v1

Severity

Low

Discovered

Oct 23, 2025

Filed

Nov 5, 2025

To disclose

13 days

Affected

Not disclosed

Confidence

66%

Full breach record for ALT5 Sigma Corporation →

ALT5 Sigma Corporation disclosed an insider threat incident involving a former consultant who accessed and exfiltrated company emails and files without authorization, which the Company discovered on October 23, 2025. The company terminated the consultant's access, engaged forensic experts, and filed a lawsuit in Delaware Chancery Court seeking injunctive relief. The scope of compromised confidential information is under investigation.

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Incident timeline

discovery → filing · 13 days

Oct 23, 2025

Discovered

Oct 29, 2025

Scope determined

Nov 5, 2025

Filed

vs. sector median

17 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: ALT5 Sigma Corporation
norm: alt5 sigma
SEC CIK: 0000862861

Name: ALT5 Sigma Corporation
norm: alt5 sigma
SEC CIK: 0000862861
Industry: Technologyllm

Discovered: Oct 23, 2025
Materiality determined: Oct 29, 2025
Notification sent: —
Affected individuals: Not disclosed
Data types: —
Attack vector: Insider
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: Internal
Initial access: insider_action

During the incident: Terminated the consultant's access to all Company email and systems
Engaged forensic experts to assist with its investigation of the matter
Commenced a lawsuit in the Chancery Court of the State of Delaware against the former consultant, and affiliated entities and individuals, seeking a temporary restraining order and injunctive relief
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 days(13 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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 filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/862861/000149315225020803/form8-k.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Nov 5, 2025
Raw hash: e64e4aae0752963debecbdeba86b40453075f48b9947d4129e9b949c09a107e6

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Reporting entityALT5 Sigma Corporation

Victim entityALT5 Sigma Corporation

Incidentdiscovered Oct 23, 2025

Stated responseTerminated the consultant's access to all Company email and systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing