The Mather Group Data Breach Investigation

Turke & Strauss LLP, a leading data breach law firm, is investigating The Mather Group, LLC regarding its recent data breach. The Mather Group data breach involved sensitive personal identifiable information and protected health information belonging to over 3,500 individuals.


The Mather Group is an independent investment advisory firm that specializes in financial and retirement planning, tax planning, estate planning, executive services, and investment management. Registered under the Investment Advisers Act of 1940 as a Registered Investment Adviser, The Mather Group’s advisers do not hold brokerage licenses nor earn commissions. Therefore, The Mather Group is able to minimize costs and focus its work with the client’s best interest in mind. Headquartered in Chicago, Illinois, The Mather Group has 13 additional offices located across every region in the United States. Since its founding in 2011, The Mather Group has expanded exponentially and now manages over $8.6 billion in assets and employs over 160 people.


On June 21, 2023, The Mather Group discovered that it had experienced a data breach in which the sensitive personal identifiable information and protected health information in its systems may have been accessed and acquired. Through its investigation, The Mather Group determined that an unauthorized actor may have accessed this sensitive information by installing malware on its network. On September 14, 2023, The Mather Group began notifying individuals whose information may have been impacted. The type of information exposed includes:

  • Name
  • Social Security number
  • Driver’s license
  • Financial information (e.g., financial account numbers and IRS PINs)
  • Medical information

If you received a breach notification letter from The Mather Group, LLC:

We would like to speak with you about your rights and potential legal remedies in response to this data breach. Please fill out the form, below, or contact us at (608) 237-1775 or

If you were impacted by the The Mather Group data breach, you may consider taking the following steps to protect your personal information.

  1. Carefully review the breach notice and retain a copy;
  2. Enroll in free credit monitoring service provided by The Mather Group, LLC;
  3. Change passwords and security questions for online accounts;
  4. Regularly review account statements for signs of fraud or unauthorized activity;
  5. Monitor credit reports for signs of identity theft; and
  6. Contact a credit bureau(s) to request a temporary fraud alert.

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