MJMS Family Office Services Data Breach Lawsuit Investigation
Received a July 2026 breach notice from MJMS?
Dapeer Law, P.A. is investigating a potential class action against MJMS Family Office Services LLC and Madden, Jiganti, Moore & Sheridan LLP, a Chicago tax and accounting firm serving high-net-worth families, on behalf of individuals whose personal information may have been exposed in the July 2026 data security incident.
Who may qualify
You may be eligible to participate in a class action if any of the following applies:
- You received a data breach notification letter from MJMS dated July 2026.
- Your letter offered enrollment in free Kroll identity monitoring.
- You had personal or financial information held by MJMS in its capacity as a tax and accounting firm.
- No proof of harm required to consult with counsel. You do not need to have already suffered identity theft to explore your legal options.
- Excluded: individuals who did not receive a breach notice and whose information was not involved in the incident.
Not sure if you qualify?
Send us your notice, we'll confirm your eligibility at no cost.
What happened
On July 14, 2026, MJMS Family Office Services LLC and Madden, Jiganti, Moore & Sheridan LLP ("MJMS"), a tax and accounting firm headquartered in Chicago, Illinois that serves high-net-worth families, filed notice of a data security incident with the Massachusetts Attorney General. MJMS reported that, upon discovering suspicious activity, it immediately commenced an investigation to confirm the nature and scope of the event. Citing the requirements of Massachusetts law, the company has not publicly described the technical cause of the incident, but its review confirmed that an unauthorized actor gained access to files containing personal information.
According to the filing, the incident involved 8 individuals. The categories of information identified in the affected files include Social Security numbers, driver's license numbers, and financial account information. MJMS is offering 24 months of complimentary identity monitoring through Kroll, which includes credit monitoring, fraud consultation, and identity theft restoration, and states that it implemented additional security measures related to data privacy and security following the incident. The specific categories exposed for any given person are stated in that individual's notice letter.
Whether MJMS's pre-breach security practices met legal standards, the technical cause of the incident, and the full number of individuals affected across all states are among the issues being evaluated. Because the reported categories include Social Security numbers and financial account information, affected individuals may face a heightened risk of identity theft and financial fraud.
What to do if you received a letter
Keep your notice letter
Do not discard it. Your letter contains the enrollment code for identity monitoring and is important evidence if you decide to participate in a lawsuit.
Enroll in the free 24-month identity monitoring
Enroll in the Kroll identity monitoring offered in your letter before the stated deadline. Accepting this benefit does not waive your right to pursue legal action.
Place a fraud alert or credit freeze
Contact Equifax, Experian, and TransUnion to place a fraud alert or freeze on your file. Request a free weekly credit report from AnnualCreditReport.com, and use the FTC's IdentityTheft.gov recovery guide.
Speak with a data breach attorney
Consultations with Dapeer Law are free and confidential. We'll review your notice, explain your options, and advise whether you may be eligible to join a class action.
Submit your notice for a free review
Two minutes online. A licensed attorney reviews every submission.
Breach timeline
Compensation you may be entitled to
Out-of-pocket expenses
Credit freezes, identity restoration services, and other costs incurred responding to the breach.
Time spent monitoring
Hours spent reviewing accounts, disputing fraudulent charges, and dealing with identity theft issues.
Identity theft & fraud losses
Unreimbursed funds stolen from accounts, unauthorized credit lines, or tax refund fraud tied to the breach.
Statutory damages
Certain state data breach and consumer protection statutes provide for fixed damages regardless of actual loss.
Injunctive relief
Court orders requiring the firm to implement stronger data security practices going forward.
Compensation categories depend on applicable state law, the types of data exposed, and documented losses. No recovery is guaranteed.
Common questions
I received a data breach letter from MJMS. What should I do? +
Keep the letter, enroll in the free 24-month Kroll identity monitoring before the deadline printed in your notice, review your credit reports and financial accounts for suspicious activity, place a fraud alert or credit freeze on your credit file, and contact a data breach attorney for a free consultation. Because the reported categories include Social Security numbers and financial account information, watch closely for signs of identity theft and account fraud. Accepting monitoring does not waive your right to sue.
Am I eligible to join a class action against MJMS? +
If you received a 2026 breach notice from MJMS, you are likely eligible for a free case evaluation. Eligibility depends on your state of residence, the categories of your data that were exposed, and any losses you have suffered. Dapeer Law will review your notice at no cost.
How much money could I receive from a class action lawsuit? +
Data breach class action recoveries vary significantly. Settlements typically range from a few hundred dollars for basic out-of-pocket losses to several thousand dollars for documented identity theft, with class size, damages, and negotiation all affecting the final amount. No payout is guaranteed, and this investigation has not yet resulted in a settlement.
What personal information was exposed in the breach? +
The categories identified in the affected files include Social Security numbers, driver's license numbers, and financial account information. Citing Massachusetts law, MJMS has not publicly described the technical cause of the incident. Your individual notice letter should specify the categories of your data that were involved.
Did MJMS offer free credit monitoring? +
Yes. MJMS is providing 24 months of complimentary identity monitoring through Kroll, including credit monitoring, fraud consultation, and identity theft restoration. Enroll before the deadline printed in your letter. Enrollment is separate from, and does not waive, your right to pursue a claim.
How many people were affected by the MJMS breach? +
The Massachusetts Attorney General filing lists 8 affected individuals. The total number of individuals affected across all states has not been separately disclosed. This page will be updated as additional information becomes available.
Is there a deadline to take legal action? +
Yes. Statutes of limitations for data breach claims vary by state and legal theory, typically ranging from one to six years. Waiting can permanently bar your claim. Contact us as soon as possible for a free evaluation.
How do I get a copy of the official breach notice? +
The notice filed with the Massachusetts Attorney General is available through the Massachusetts AG (linked in Sources below). If you received a letter but no longer have it, Dapeer Law can assist you in obtaining a copy during your free consultation.
Sources & references
- Official breach notice filing · Massachusetts Attorney General, Data Breach Notification
- Company · MJMS Family Office Services LLC and Madden, Jiganti, Moore & Sheridan LLP (mjmsfos.com)
- Credit bureau freezes · Equifax · Experian · TransUnion
- Free weekly credit reports · AnnualCreditReport.com
- Identity theft recovery guide · FTC IdentityTheft.gov
Don't let the deadline decide for you. Submit your claim today.
You only have a limited window to act. Our team will review your notice, explain your options, and tell you whether you may be eligible to recover compensation, at no cost to you.
