HackingFinancial ServicesFinanceData ExfiltratedCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)Financial accountLowContained

HENNESSY ADVISORS, INC.

bd_072c9ab8534cfc81 · schema v1 · pii pii-v1

Severity

Low

Discovered

Mar 30, 2025

Filed

Feb 24, 2026

To disclose

47 weeks

Affected

Not disclosed

Linked

9 filings

Confidence

65%

Full breach record for HENNESSY ADVISORS, INC. →

Hennessy Advisors, Inc. disclosed a data security incident discovered on March 30, 2025, involving unauthorized access and release of personal information for certain investors in the Hennessy Funds. The company retained third-party specialists to investigate and secure systems. Personal information potentially affected includes identity and financial data. Complimentary credit monitoring and identity theft protection services are being offered to affected individuals.

J jump to incidentP pin to compareR raw source

California clockDiscovered Mar 30, 2025 → Notified Feb 23, 2026330d ✗ CA 60-day late47 weeks discovery → filing

Incident timeline

discovery → filing · 47 weeks / 331 days

Mar 30, 2025

Begins

Mar 30, 2025

Discovered

Feb 24, 2026

Filed

vs. sector median

+39 wks slower

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

Linked disclosures

Why this link?

Regulatory filings (8) · sorted by filing gap

Maine State AGbd_41991ab4574f8c982026-02-24Verified by operator
Massachusetts State AGbd_4cad2bf43441a73a2026-02-24Verified
New Hampshire State AGbd_6d4e4e25f72021c32026-02-24Verified
Texas State AGbd_4a3d6923a18d23b52026-02-25 · +1dVerified by operator

Show 4 more filings ↓up to 23d gap

Indiana State AGbd_155d62cf979564682026-02-23 · +1dCandidate
Vermont State AGbd_d11bdc84764407482026-02-23 · +1dVerified
Nebraska State AGbd_f68cb883eed2da892026-02-23 · +1dVerified
Illinois State AGbd_ffe201debd927b8a2026-02-01 · +23dVerified

Name: HENNESSY ADVISORS, INC.
norm: hennessy advisors
Domain: hennessyadvisors.com

Name: HENNESSY ADVISORS, INC.
norm: hennessy advisors
Domain: hennessyadvisors.com
Industry: Financial Servicesllm

Discovered: Mar 30, 2025
Breach occurred: Mar 30, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 23, 2026
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)Financial account
Attack vector: Unknown
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Filed notification with California Attorney General

During the incident: Retained third-party specialists to assist with the investigation
Worked to identify whose personal information was affected for the purpose of notifying them
Offering identity theft protection services through IDX
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 47 weeks(331 days from discovery to filing)
Compliance flags: CA 60-day late · 330dCA AG copy ≤15d · 1d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Mar 30, 2025
→ Notified: Feb 23, 2026
330d 60 days (analyst band, pre-2026 discoveries) CA 60-day late
California
Consumers notified: Feb 23, 2026
→ AG copy submitted: Feb 24, 2026
1d 15 calendar days CA AG copy ≤15d

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Mar 30, 2025 → Notified: Feb 23, 2026	330d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late
California	Consumers notified: Feb 23, 2026 → AG copy submitted: Feb 24, 2026	1d	15 calendar days	CA AG copy ≤15d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 9 states

View merged incident ↗

Illinois State AGFeb 1 · first

Indiana State AG+22d

Vermont State AG+22d

Nebraska State AG+22d

Maine State AG+23d

Massachusetts State AG+23d

New Hampshire State AG+23d

California State AG+23d · this page

Texas State AG+24d

Pattern: first filing Feb 1 (IL), last Feb 25 (TX) — a 24-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://oag.ca.gov/ecrime/databreach/reports/sb24-619204
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 24, 2026
Raw hash: b5111f847fe7ced0e1c25438521d7b17bccfe9638714231b7cd0c4d276ef0c5c

Linked disclosures

Regulatory filings (8) · sorted by filing gap

Reporting entityHENNESSY ADVISORS, INC.

Victim entityHENNESSY ADVISORS, INC.

Incidentdiscovered Mar 30, 2025

Stated responseRetained third-party specialists to assist with the investigation

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov