HENNESSY ADVISORS, INC. — March 2025 breach

Clustered 9 filings across 9 jurisdictions · filing window Feb 23, 2026 → Feb 25, 2026 (dated filings only). View entity profile → Other incidents for this victim →

⚠ 2 cross-filing discrepancies →Merge100%

Determination

Confirmed

Members

9 filings

States

Affected · reported

12,643

First → last dated filing

Feb 23, 2026 → Feb 25, 2026

Merge confidence

100%

incident inc_e99dfcc3aaa149b0 · merged by deterministic · confidence 100%

Confirmed breach. Merged as one breach: 9 regulatory filings. The filings describe unauthorized access. Intrusion Mar 30, 2025, discovered Mar 30, 2025. 12,643 individuals reported across the linked filings. Data reported: Government ID, Financial account, PII, and 1 more. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Supplemental

Discovery variance

312days

Range of discovered_at dates across filings

Filing span

2days

Time between earliest and latest filing

Not recorded for this incident

Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.

Regulatory clocksVermont✗ VT AG >45 bdayCalifornia✗ CA 60-day late · 330dMaine⏱ ME AG >30d · 331dTexas✓ TX AG ≤30dFull clock table in Litigation Timeline

No cross-filing comparison data available for this incident.

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