Hennessy Advisors
Data Breach Class Action Lawsuit

Posted: February 25, 2026 -- Hennessy Advisors data breach class action lawsuit investigation.

Abington Cole + Ellery is investigating the data breach recently announced by Hennessy Advisors and may be filing a class action lawsuit on behalf of victims.

Hennessy Advisors Data Breach Summary:

In late February of 2026, Hennessy Advisors, an investment management firm, disclosed a security incident involving unauthorized access to sensitive data, which took place on or around March 30, 2025. Approximately 12,000 individuals were affected by the Hennessy Advisors data breach, and breached data may include, but is not necessarily limited to: personal information. As a result of the data breach, Hennessy Advisors is offering 12 months of free credit monitoring and/or identity theft protection services to affected individuals.

FREE CONSULTATION: If you are a victim of the Hennessy Advisors data breach, and interested in potentially volunteering to serve as a class representative in a class action lawsuit against Hennessy Advisors, please submit your information here to be considered:

An attorney-client relationship is not formed by submitting information through this website.

Hennessy Advisors Data Breach Details:

Hennessy Advisors, an investment firm that manages a series of mutual funds, recently disclosed a cybersecurity event compromising investor records. The company first identified unusual network behavior on March 30, 2025, which disrupted access to internal systems and prompted an immediate response that included hiring outside forensic experts, locking down vulnerable areas, and ongoing surveillance. Although early checks found no signs of stolen data, deeper examination in late December 2025 confirmed that outsiders had extracted and publicly shared files containing sensitive details belonging to certain fund participants. By early February 2026, the firm had pinpointed which individuals were impacted and began preparing personalized alerts.

In response, Hennessy Advisors arranged no-cost identity safeguards for everyone affected through a specialized provider. These services feature extended monitoring of credit files and online exposure risks, a million-dollar reimbursement policy for theft-related losses, and professional assistance to restore any compromised identities. Recipients received instructions to activate the offer by May 23, 2026, using a unique code provided in their notice. The firm also supplied guidance on reviewing financial statements, obtaining annual credit reports from the three major bureaus, placing alerts or freezes if desired, and contacting regulators or law enforcement if fraud appears.

The Hennessy Advisors Website may also have additional information about or provide periodic updates regarding the data breach.

About Hennessy Advisors:

Hennessy Advisors, Inc. is a publicly traded investment management firm (ticker: HNNA) that oversees, services, and markets the Hennessy Funds, a lineup that includes traditional mutual funds across equity, sector/specialty, and multi-asset strategies as well as exchange-traded funds (ETFs). Founded in 1989 in the San Francisco Bay Area, the firm operates as an SEC-registered investment adviser and has expanded from its early balanced and total-return offerings into a broader fund family. As of December 31, 2025, Hennessy reported about $4.3 billion in assets under management and 17 funds managed, and it is based in Northern California.

Additional Information:

Hennessy Advisors Data Breach Notification -- State of Maine

For more information about steps you can take to possibly reduce the chances harm arising from a data breach, please review the following article: What are some steps you can take if you've been the victim of a data breach?

If you believe you are a victim of the Hennessy Advisors data breach, and if you would like to volunteer to serve as a class representative in a class action lawsuit regarding this data breach, please submit your information via the form on this webpage. This website is not associated with nor authorized by Hennessy Advisors or any affiliated companies. If you have received any other data breach notifications, you may to review Abington Cole + Ellery's current list of data breach investigations.