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Got a notice from Mark Thomas? Here’s what to do.

Mark Thomas told the Maryland Attorney General that people’s information was exposed. If you got a letter, work through the steps below.

Your checklist

  1. 1

    Keep the letter

    Save the notice from Mark Thomas and its envelope. The date you were told can matter for legal deadlines.

  2. 2

    Freeze your credit

    Your Social Security number is listed in the filing. A free freeze at Equifax, Experian and TransUnion stops new accounts being opened in your name.

  3. 3

    Call your bank

    Account or card information is listed. Ask your bank for a new card number and watch statements for small test charges.

  4. 4

    Get a free claim review

    Our legal team checks whether you can be paid for this breach. No fee unless you recover.

Step 4: free claim review

Tell us you got the Mark Thomas notice. An attorney, not a call center, reads it and tells you plainly whether you have a claim.

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About the Mark Thomas breach

Reported to
Maryland Attorney General
Date filed
March 17, 2025
People notified
Not stated
Cause in filing
Not stated

Information listed in the filing: Full Name, Social Security Number, Date of Birth, Home Address, Financial Account Details, Tax Return Information, Legal Correspondence and Case Files, Direct Deposit Information.

Mark Thomas operates as a specialized legal and professional services firm, navigating complex corporate transactions, litigation, wealth management, and advisory services. Because of the sophisticated nature of its practice, Mark Thomas routinely collects, processes, and stores an extensive volume of highly sensitive information. This repository includes confidential client files, proprietary corporate strategies, financial records, transactional data, and deeply personal details regarding individuals involved in ongoing legal matters. The firm functions as a trusted custodian of confidential data, making its network a high-value target for malicious actors seeking to exploit commercially valuable or personally identifiable information.

In 2025, Mark Thomas reported a significant cybersecurity incident to the Maryland Attorney General, signaling a breach of its digital infrastructure. While the exact vector of the attack remains under investigation, incidents affecting firms of this caliber typically involve sophisticated ransomware deployments, unauthorized intrusion into centralized document management systems, or vulnerabilities within third-party vendor platforms. In the legal sector, threat actors frequently target the systems where sensitive client communications, billing details, and personal identifying documents are stored, bypassing perimeter defenses to exfiltrate confidential files before security teams can intervene.

An unauthorized breach of Mark Thomas exposes a dangerous mix of personal identifying information and proprietary documentation, creating severe risks for affected individuals. The compromised data fields commonly include full names, dates of birth, Social Security numbers, banking and wire transfer details, tax documents, and privileged correspondence. When exposed, this combination of data provides cybercriminals with the exact blueprint needed to execute targeted financial fraud, identity theft, tax refund scams, and account takeover operations. The exposure of legal and financial records strips away individuals' privacy and leaves them vulnerable to ongoing financial monitoring and exploitation.

As a professional services organization entrusted with sensitive data, Mark Thomas had strict legal and ethical obligations to implement robust cybersecurity measures. Under state data protection statutes and common-law principles, firms handling confidential personal and financial data must maintain reasonable security procedures, including encryption, multi-factor authentication, network segmentation, and regular vulnerability assessments. The occurrence of a data breach of this scale strongly indicates a potential failure in these statutory and duty-of-care obligations, suggesting that vulnerabilities within the firm's network infrastructure were left unaddressed.

Receiving an official data breach notification letter from Mark Thomas is a formal acknowledgement that your private information was compromised due to inadequate security practices. Legally, this notice establishes standing to participate in a class action lawsuit aimed at holding the firm accountable for failing to protect sensitive data. You do not need to prove that you have already suffered actual financial fraud or out-of-pocket losses to seek legal redress. Our firm handles these complex class action cases on a contingency fee basis, meaning there are never any out-of-pocket costs or upfront fees, and we only collect a fee if we successfully recover compensation on your behalf.

See the official filingFull ransomware checklist

Mark Thomas data breach questions

How many people were affected by the Mark Thomas data breach, and what was exposed?
The filing does not give a count of affected people and lists the following information as involved: Full Name, Social Security Number, Date of Birth, Home Address, Financial Account Details, Tax Return Information, Legal Correspondence and Case Files, Direct Deposit Information. Your own letter is the best guide to what was exposed about you, since notices are usually tailored to each person.
Is the Mark Thomas data breach letter legit or a scam?
A notice from Mark Thomas in the mail matches the breach Mark Thomas reported to the Maryland Attorney General on March 17, 2025. Check that the company name and dates in your letter match that filing. A real notice of data security incident won't ask for your password, Social Security number or a payment — if it does, contact Mark Thomas through a phone number or website you find yourself.
Did Mark Thomas offer free credit monitoring?
Check your letter from Mark Thomas. If free credit or identity monitoring is offered, the enrollment code and deadline are printed in the notice itself. Because Social Security numbers are listed in this filing, identity monitoring and a credit freeze matter more than usual. Enrolling does not give up your right to bring a claim.
Is there a Mark Thomas data breach class action lawsuit?
Law firms often open an investigation after a breach notice like this one, and a class action lawsuit may follow. This page doesn't confirm that a lawsuit has been filed against Mark Thomas. You usually don't have to join a class action to be included — if a settlement is reached, class members are notified and can file a claim.
What should I do after getting the Mark Thomas data breach notice?
Keep the letter and the envelope, and note the date it arrived. Freeze your credit with Equifax, Experian and TransUnion, change any passwords the notice mentions, and sign up for any free credit monitoring the letter offers. Then check whether you may have a claim.
Where can I see the official Mark Thomas breach notice?
Mark Thomas's report is published by the Maryland Attorney General: https://oag.maryland.gov/resources-info/Pages/security-breach-notices.aspx#ITU-376560 Compare it with the letter you received to confirm the dates and details match.
Do I need a Mark Thomas data breach lawyer or attorney?
An attorney can read your notice and tell you whether a claim makes sense. A case review here is free, and data breach cases are usually handled on contingency, so there is no upfront cost.
Can I sue Mark Thomas over the data breach?
It depends on what was exposed, the law in Maryland and your own state, and whether you've been harmed. Most people take part through a class action rather than suing alone. Keep your notification letter — it's the proof that connects you to the breach.
How much could a Mark Thomas data breach settlement or claim be worth?
There is no set amount, and no Mark Thomas settlement is confirmed here. In past data breach settlements, payments depended on what data was exposed and on documented losses — fraud, out-of-pocket costs and time spent dealing with the breach. The filing lists Full Name, Social Security Number, Date of Birth as involved. Keep receipts and records; they're what damages claims are built on.

Other notices sent in Maryland

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