HENNESSY ADVISORS, INC.
bd_41991ab4574f8c98 · schema v1 · pii pii-v1
Full breach record for HENNESSY ADVISORS, INC. →Hennessy Advisors, Inc., an investment management firm, reported an external system breach on March 30, 2025. Unauthorized access occurred, resulting in the exfiltration of investor personal information. The breach was discovered on March 30, 2025, and notifications were sent on February 23, 2026. Approximately 12,643 individuals were affected, including 48 Maine residents. Identity theft protection services were offered.
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Incident timeline
Mar 30, 2025
Begins
Mar 30, 2025
Discovered
Feb 24, 2026
Filed
vs. sector median
+39 wks slower
Linked disclosures
Why this link?Regulatory filings (8) · sorted by filing gap
- California State AGbd_072c9ab8534cfc812026-02-24Verified
- 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 ↓Show fewer ↑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
Filing propagation · 9 filings · 9 states
View merged incident ↗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
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.