MasTec, Inc. Data Breach Lawsuit Investigation
Received a May 2026 breach notice from MasTec?
Dapeer Law, P.A. is investigating a potential class action against MasTec, Inc., a Florida-based infrastructure construction company, on behalf of individuals whose personal information may have been exposed in the August 2025 network intrusion that MasTec began disclosing in May 2026.
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 MasTec dated May 2026.
- You are a South Carolina or Texas resident, or a resident of another state, whose information MasTec identified in the files involved in the incident.
- You had personal or financial information held by MasTec, such as your name, address, date of birth, Social Security number, or financial account details.
- 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
According to a notice filed with the South Carolina Attorney General, MasTec, Inc. detected suspicious activity in a limited part of its computer network in early October 2025. The company engaged third-party cybersecurity experts, who determined that an unauthorized party had accessed a small portion of the network for a few days in August 2025. MasTec also reported the matter to law enforcement.
MasTec identified the files that were involved and retained a data-review firm to analyze their contents. That review concluded in early February 2026, after which the company worked to confirm contact information and began mailing notification letters on May 11, 2026. State regulatory filings followed on June 5, 2026 in South Carolina, Texas, and Maine. The roughly seven months between discovery and notice is one point this investigation is evaluating, because several state breach laws require that notice be provided without unreasonable delay.
The Texas filing states that the affected files may have contained names, addresses, dates of birth, Social Security numbers, financial account information such as bank account numbers, and credit or debit card numbers. The specific data elements differ by individual and are described in each person's letter. Exposure of Social Security numbers and financial account data can carry a heightened risk of identity theft and financial fraud. Copies of the official notices are available from the South Carolina Attorney General and the Maine Attorney General.
What to do if you received a letter
Keep your notice letter
Do not discard it. Your letter explains which categories of your information were involved and is important evidence if you decide to participate in a lawsuit.
Review your financial statements closely
MasTec's notice did not include a credit-monitoring offer, so watch your bank, credit card, and other account statements for unauthorized activity and report anything unfamiliar to your financial institution right away.
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. Because Social Security numbers were reported as involved, consider a credit freeze rather than only a fraud alert.
Speak with a data breach attorney
Consultations with Dapeer Law are free and confidential. We will review your notice, explain your rights under applicable state breach and consumer protection laws, and advise whether you may be eligible to join a class action.
Submit your notice for a free review
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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 MasTec to strengthen its data security practices and better protect personal information 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 MasTec. What should I do? +
Keep your notice letter, since it lists the categories of your information that were involved. Monitor your bank and credit card statements for unauthorized activity, and because Social Security numbers were reported as involved, consider placing a fraud alert or credit freeze with Equifax, Experian, and TransUnion. You can also speak with a data breach attorney about your options at no cost.
Am I eligible to join a class action against MasTec? +
Anyone whose personal information was contained in the affected files and who received a MasTec notification letter may qualify. Eligibility can also depend on your state of residence and the categories of your data that were exposed. You do not need to have already experienced identity theft to ask whether you have a claim.
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 Texas regulatory filing reports that the affected files may have contained names, addresses, dates of birth, Social Security numbers, financial account information such as bank account numbers, and credit or debit card numbers. The exact data elements vary by person, so check your individual letter for what applied to you.
Did MasTec offer free credit monitoring? +
MasTec's notice did not specify a credit-monitoring offer. It encourages recipients to stay vigilant and review their account statements, and it lists additional steps for protecting your identity. If you were offered monitoring in your individual letter, enrolling does not waive your right to pursue legal action.
How many people were affected by the MasTec breach? +
MasTec has reported 5,987 affected individuals, including 1,160 residents of South Carolina and 4,827 residents of Texas. The company also filed with the Maine Attorney General, which did not state a Maine resident count. This page will be updated as more becomes known.
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 official notices were filed with the South Carolina and Maine Attorneys General. You can download the South Carolina breach notice (PDF) and the Maine breach notice (PDF) directly, or contact Dapeer Law and we can help you obtain a copy during a free consultation.
Sources & references
- Official breach notice filing · South Carolina Attorney General, consumer breach notice (PDF) · Maine Attorney General, breach notice (PDF)
- Company · MasTec, Inc. (mastec.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.
