Hamill & Kaplan, LLP Data Breach – Investigated by Federman & Sherwood
August 10, 2026 – Federman & Sherwood, a national consumer protection law firm, is investigating the Hamill & Kaplan, LLP data breach following a cybersecurity incident that may have compromised highly sensitive personal and financial information.
According to the notice filed with the California Attorney General, Hamill & Kaplan discovered on September 19, 2025, that an unauthorized user had gained access to its computer network earlier that day. The unauthorized actor was able to access company files containing personal information. Hamill & Kaplan subsequently engaged third-party IT specialists to investigate the nature and scope of the incident and enhance its network security.
The information potentially accessed may include Social Security numbers, other government identification numbers, names, bank account information, and other sensitive information provided to Hamill & Kaplan. The firm states that it has no information indicating that the affected data has been misused. Hamill & Kaplan also reports that it notified the FBI, IRS, Franchise Tax Board, and Secret Service of the incident.
Federman & Sherwood is investigating whether Hamill & Kaplan, LLP implemented reasonable cybersecurity safeguards to protect sensitive personal and financial information and whether additional security measures could have prevented this incident.
The exposure of Social Security numbers, government identification numbers, and banking information may significantly increase the risk of identity theft, tax fraud, financial fraud, and unauthorized account activity.
The potentially compromised information may include:
- Names
- Social Security numbers
- Government-issued identification numbers
- Financial information
- Other sensitive information
What is Hamill & Kaplan, LLP?
Hamill & Kaplan, LLP is a certified public accounting and tax firm based in Westlake Village, California.
Individuals affected by the Hamill & Kaplan, LLP data breach may have legal rights and are encouraged to contact Federman & Sherwood to learn more about their options.
Phone: 1-800-237-1277 | Email: info@federmanlaw.com