Hallisey & D’Agostino Data Breach Lawsuit Investigation
Hallisey & D’Agostino clients recently received notice that an unauthorized actor accessed the firm’s computer network, potentially compromising sensitive personal data. If you were notified, you may be entitled to compensation and complimentary identity-protection help. Contact our data-breach team for a free, confidential case evaluation today.
What Happened?
According to the firm’s April 17, 2026 consumer notice to the Maine Attorney General, Hallisey & D’Agostino, LLP (“Hallisey & D’Agostino”) detected unusual activity in its network on October 21, 2025. A forensic investigation revealed that an unknown actor obtained unauthorized access between September 28 and October 22, 2025. The firm completed a detailed review of the affected files on March 19, 2026, confirming that certain personal information was involved.
What Information Was Exposed?
Hallisey & D’Agostino states that the compromised data may have included:
Name
Additional personal details referenced in the notice letter
The specific data elements vary by individual. Review your notification letter to understand what was affected in your case.
Company Response
After discovering the incident, Hallisey & D’Agostino:
Secured its IT environment and implemented additional security safeguards.
Engaged external cybersecurity specialists to investigate.
Notified the Federal Bureau of Investigation and is cooperating with law-enforcement efforts.
Is offering complimentary identity-theft protection services through IDX, which include credit monitoring, CyberScan monitoring, a $1 million insurance reimbursement policy and fully managed identity-recovery support.
What You Can Do Now
If you received a breach letter from Hallisey & D’Agostino, consider taking the following steps immediately:
Enroll in the free IDX identity-protection services before the stated deadline.
Monitor your credit reports, bank statements and insurance explanations of benefits for unfamiliar activity.
Retain all breach-related documents; they are essential for any legal claim.
Contact our legal team to discuss your rights and potential financial recovery.
Company Overview
Hallisey & D’Agostino, LLP (Hallisey & D’Agostino) is a Connecticut-based accounting firm founded in 1972.
Website: hdllpcpa.com
Industry: Accounting
Employees: 11-50
Headquarters: 540 Silas Deane Highway, Wethersfield, CT, USA
Privacy Policy: View
Contact Page: Get in Touch
Sources
Impacted Entities
Frequently Asked Questions
I received a data breach letter from Hallisey & D’Agostino — what should I do?
Follow the enrollment instructions for the complimentary IDX protection, closely monitor your accounts for suspicious activity and contact our firm to learn about potential legal options.
How do I submit a claim related to the Hallisey & D’Agostino data breach?
Gather your breach notice, enrollment confirmation and any evidence of fraud, then reach out to our data-breach team. We will review your documents and advise on filing an individual or class action claim.
Am I eligible to join a lawsuit against Hallisey & D’Agostino?
Eligibility depends on factors such as receipt of an official notice and any resulting financial or privacy harms. Contact us for a free evaluation.
What information did the Hallisey & D’Agostino breach expose?
The firm reports that names and other personal data listed in individual letters were accessible. Review your notification for specifics.
Did Hallisey & D’Agostino offer credit monitoring, and for how long?
Yes. The firm is providing complimentary identity-protection services through IDX, which include credit and CyberScan monitoring and identity-recovery assistance.
How many people were affected by the Hallisey & D’Agostino breach?
The official notice did not disclose the total number of impacted individuals. You can request this information directly from the firm or the Maine Attorney General’s office.
How can I get the official breach notice (PDF) for Hallisey & D’Agostino?
You can download it from the Maine Attorney General’s website using the button above or the link in the Sources sidebar.
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