Terillium Data Breach Lawsuit Investigation
Terillium has notified regulators and affected employees of a ransomware attack that exposed sensitive personal information in July 2025. If you received a breach notice—or believe your data may have been compromised—review the facts below and contact our team to discuss your rights and potential claims.
Key Details of the Terillium Ransomware Incident
- Breach window: July 18 – 19, 2025
- Date discovered: July 18, 2025 (same day)
- Notice filed: October 24, 2025 (Montana Attorney General)
- Total individuals affected: 3 (all reported in Montana)
- Data involved: name, address, Social Security number
What Happened
According to Terillium’s notice to the Montana Attorney General, the company detected a ransomware attack on July 18, 2025. Security teams immediately isolated the affected systems and contained the incident by July 19, 2025. A subsequent forensic investigation reported no further signs of compromise.
What Information Was Exposed?
The intrusion may have compromised certain records relating to current and former employees, including:
- Name
- Mailing address
- Social Security number
Company Response
Terillium reports that it:
- Engaged external cybersecurity specialists to investigate the attack.
- Contained the ransomware and restored functionality to all affected servers.
Steps You Can Take to Protect Your Identity
The company urged affected individuals to remain vigilant and provided the following guidance:
- Monitor credit and financial accounts. You are entitled to one free credit report annually from each major bureau—Equifax, Experian, and TransUnion.
- Consider a fraud alert or security freeze. Contact the credit bureaus to add these safeguards to your file.
- Report suspected identity theft. File complaints with local law enforcement, your state Attorney General, or the Federal Trade Commission (1-877-438-4338 | identitytheft.gov).
- Review additional FTC resources. Visit ftc.gov for step-by-step recovery guidance.
Can You File a Terillium Data Breach Lawsuit?
Organizations that collect and store personal information owe a duty to safeguard it. When that duty is breached, affected individuals may seek compensation for:
- Time and expenses spent monitoring accounts
- Out-of-pocket costs for credit services
- Potential identity theft losses
- Emotional distress stemming from the exposure
If you received Terillium’s notice, complete our confidential case evaluation to learn whether you qualify to participate in a data breach lawsuit or settlement.
Company Overview
Terillium is an information technology & services firm headquartered at 201 E. Fifth Street, Suite 2700, Cincinnati, Ohio. Founded in 1994, the company employs 200+ professionals and provides enterprise resource planning (ERP) consulting services.
Key Links
Frequently Asked Questions About the Terillium Data Breach
How did the Terillium data breach happen?
The company states it experienced a ransomware attack on July 18, 2025 that was contained the next day.
What data was compromised in the Terillium breach?
Names, mailing addresses, and Social Security numbers of certain current and former employees.
How many people were affected by the Terillium ransomware attack?
Terillium reported 3 affected individuals to the Montana Attorney General.
Has Terillium offered identity protection services?
The notice does not describe a complimentary monitoring service; instead, it provides guidance on placing fraud alerts and security freezes.
Can I join a Terillium data breach lawsuit if I live outside Montana?
Yes. The Montana filing only reflects that state’s reporting requirements. If your data was stored on Terillium’s systems, you may still have a claim. Contact us for a free review.
What is the deadline to take legal action?
Statutes of limitation vary by state. Preserve your rights by speaking with counsel as soon as possible after receiving a notice.
Last updated: October 28, 2025