Hennessy Advisors, Inc. recently reported a data breach involving unauthorized access to personal information. The breach, which occurred between late December 2025 and early 2026, affected 12,643 individuals, including 48 residents of Maine.
Hennessy Advisors Data Breach Investigation
Hennessy Advisors, a publicly traded investment management firm providing services to the Hennessy Funds, disclosed a data security incident that may have compromised sensitive personal information. The breach was discovered on March 30, 2025, when suspicious activity was detected within the company’s systems.
Upon learning of the incident, Hennessy Advisors immediately launched an investigation and engaged third-party cybersecurity specialists to secure the company’s systems and protect data. Although no evidence of unauthorized access was found initially, a more detailed review revealed that personal information of certain investors in the Hennessy Funds had been accessed and released without authorization by late December 2025.
The company became fully aware of the unauthorized access of personal information on February 5, 2026. This breach has potentially exposed sensitive personal data that could include names, addresses, financial account numbers, and other details related to individuals’ investments.
Hennessy Advisors has taken steps to notify the impacted individuals and is offering identity theft protection services, including credit monitoring, to help mitigate the risk of fraud.
When Did This Breach Occur?
According to Hennessy Advisors:
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Date(s) the Breach Occurred: March 30, 2025 – December 2025 (unauthorized access occurred over this period)
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Date the Breach Was Discovered: February 5, 2026
The breach began with suspicious activity in March 2025, and the company discovered the extent of the unauthorized access and data release in December 2025. Full awareness of the breach occurred in February 2026.
What Information Was Breached?
The following types of information were potentially exposed during the breach:
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Personal Information: Name, address, date of birth
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Financial Information: Investment details, financial account numbers
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Other Sensitive Information: Health or insurance data, if included as part of investment-related transactions
Although the full scope of the breach is still being reviewed, the compromised data likely includes highly sensitive financial and personal identifiers.
What You Can Do
If you were affected by the Hennessy Advisors data breach, here are the steps you can take to protect your information:
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Enroll in the complimentary credit monitoring and identity theft protection services offered by Hennessy Advisors through IDX. These services include credit and CyberScan monitoring, a $1,000,000 insurance reimbursement policy, and fully managed identity theft recovery services.
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Review your financial accounts and credit reports for unauthorized activity or signs of identity theft.
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Place a fraud alert or security freeze on your credit files to prevent unauthorized access.
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Report suspicious activity to your financial institutions and law enforcement if necessary.
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Contact your beneficiaries to encourage them to enroll in the identity protection services as well.
You must enroll in the credit monitoring services by May 23, 2026. Ensure you have your unique enrollment code from the letter provided.
File a Data Breach Lawsuit Against Hennessy Advisors
If you received notice from Hennessy Advisors that your personal information was compromised in this breach, you may be eligible for compensation. Data breach lawsuits are an important tool for holding organizations accountable for mishandling or failing to secure sensitive data.
Compensation for data breach victims can include reimbursement for out-of-pocket expenses, costs related to identity theft protection services, and other damages caused by the exposure of personal information.
You don’t have to navigate this situation alone. If you believe you were impacted by this breach, understanding your rights and legal options is the first step toward seeking justice.
Contact us at Class Action U, where we can connect you with a lawyer experienced in class action lawsuits. If you’ve been contacted about this breach, received notice, or believe you were affected, fill out our quick, easy, and secure form to sign up. There is no cost to reach out to our legal partner, and no obligation after speaking with someone from our team
