✅ Official notice on file. Hennessy Advisors, Inc. filed this data breach notice with the California Attorney General on Feb 24, 2026. Compare it with the letter you received: the official copy is linked below.
Hennessy Advisors, Inc. reported a data breach caused by unauthorized access to its computer network. The letter lists the exposed information individually for each recipient, so check your own copy.
Key facts
| Discovered | Mar 30, 2025 |
|---|---|
| Incident type | Network intrusion |
| Letter sent | Feb 23, 2026 |
| Reported to California AG | Feb 24, 2026 |
| Company helpline | 1-888-201-1772 |
Free credit monitoring
Hennessy Advisors, Inc. is offering 12 months of IDX at no cost to people who received the letter. Enroll at app.idx.us/account-creation/protect using the activation code printed on your letter. Deadline to enroll: May 23, 2026.
What to do now
- Get your free credit reports at AnnualCreditReport.com and look for accounts you do not recognize.
- Call the Hennessy Advisors, Inc. helpline at 1-888-201-1772 if you have questions about your letter.
Timeline
- Mar 30, 2025 — Hennessy Advisors, Inc. discovers the incident
- Feb 23, 2026 — Notification letters sent
- Feb 24, 2026 — Breach reported to the California Attorney General
Other recent data breaches
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Source: notification letter and filing submitted by Hennessy Advisors, Inc. to the California Attorney General. BreachLetter is not affiliated with Hennessy Advisors, Inc.. Details extracted from the official letter; always follow the instructions in your own copy.