Semple Marchal and Cooper, LLP Data Breach Lawsuit Investigation
Were you notified that your personal data was compromised in the Semple Marchal and Cooper, LLP ransomware attack? More than 400,000 sensitive files are now in criminal hands, and time is running out to safeguard your identity. Find out if you can file a claim →
What Happened?
Semple Marchal and Cooper, LLP (SMC), a Phoenix-based accounting and consulting firm, disclosed that a phishing-enabled ransomware attack infiltrated its internal share drive in February 2025. The notorious INTERLOCK group later claimed responsibility and leaked stolen data on the dark web. SMC discovered the breach on May 10, 2025, and publicly reported the incident to the Maine Attorney General on August 7, 2025.
Scope of the Breach
- Number of exposed files: 411,226
- Volume of stolen data: ≈ 564 GB
- Primary client affected: SmartRent Technologies Inc. 401(k) retirement plan (2019-2024 records)
- Attack vector: Phishing email that bypassed SMC’s security filters
- Threat actor: INTERLOCK ransomware group
What Information Was Exposed?
The compromised documents contain highly sensitive personally identifiable information (PII) and employment details, including:
- Full name and surname
- Social Security number
- Date of birth
- Full residential address
- Government-issued ID details
- Employment status, hire and end dates
- Marital status and sex
- Medical and financial information
Your Rights & Next Steps
If you received a breach notification from SMC or SmartRent Technologies, you may be entitled to monetary relief and free credit protection. Take the following actions immediately:
- Activate identity-theft services offered by SMC (24 months of IDX monitoring).
- Review credit reports and account statements for unfamiliar activity.
- Place a fraud alert or credit freeze with the three major credit bureaus.
- Stay alert for phishing emails, calls or texts seeking additional personal data.
- Document any time or money spent addressing the breach—these losses may be recoverable.
Potential Compensation
A class-action investigation is underway. Impacted individuals could recover:
- Reimbursement for out-of-pocket expenses (credit fees, phone bills, notarizations)
- Compensation for lost time and emotional distress
- Future identity-protection costs
Timeline of Key Events
- February 2025 – Phishing attack grants INTERLOCK access to SMC’s share drive.
- May 10, 2025 – Breach discovered by SMC IT staff.
- May 19, 2025 – INTERLOCK posts 564 GB of SMC data on the dark web.
- July 8, 2025 – SmartRent Technologies formally notified.
- August 7, 2025 – Disclosure filed with the Maine Attorney General; notification letters mailed.
Why This Breach Matters
Accounting firms hold granular financial and employment records which can be exploited for tax fraud, medical identity theft and targeted phishing. Because Social Security numbers and birth dates never change, the risk may persist indefinitely. Acting swiftly reduces the chance of long-term harm.
FAQ: Semple Marchal and Cooper, LLP Data Breach
How do I know if Semple Marchal and Cooper, LLP exposed my data?
SMC mailed letters dated August 7, 2025. The notice outlines what information was taken and explains your complimentary IDX enrollment code.
What should I do if I lost my SMC breach notice letter?
Contact the SMC incident response line listed in the letter or reach out to the firm’s main office. Provide identifying details so a replacement notice can be issued.
Is Semple Marchal and Cooper, LLP offering free credit monitoring?
Yes. The firm is providing 24 months of IDX identity-theft protection, which includes credit monitoring, fraud insurance, and dark-web monitoring.
Can I sue Semple Marchal and Cooper, LLP for the data breach?
You may qualify to join a class-action lawsuit seeking reimbursement for financial losses and emotional distress. Eligibility typically depends on residency, date of notice, and documented damages.
Will placing a credit freeze hurt my credit score?
No. A credit freeze restricts access to your file but does not impact your score. It can be lifted temporarily whenever you need to apply for credit.
Ready to Protect Your Rights?
Don’t wait until identity thieves strike. Submit the simple claim form on this page to learn whether you can join the Semple Marchal and Cooper, LLP data-breach lawsuit and secure the compensation you deserve.