Mercadien PC Data Breach Exposes Sensitive Personal & Financial Info for over 400k

On Nov. 7, 2025, Mercadien PC Certified Public Accountants, a financial services and accounting firm experienced a data breach that may have affected personally identifiable information (PII) belonging to 402,741 clients and individuals associated with the firm, including 1,376 residents of South Carolina and 1,323 of Texas.

According to disclosures filed with the Maine Attorney General and the Massachusetts Attorney General, the breach involved unauthorized access to a range of personal and financial data.

The types of leaked data may include names, addresses, dates of birth, driver's license/Government ID numbers, Social Security numbers, financial account information, usernames and passwords, IRS pin numbers, and/or payment card information. This data is considered personally identifiable information (PII), and in some cases, financial data that could be used for identity theft or fraud.

The breach was disclosed to the attorneys general offices of Indiana, Maine, Massachusetts, New Hampshire, South Carolina, and Texas. The company also posted a notice of the data breach on its website and began notifying impacted individuals by mail.

Mercadien PC Certified Public Accountants' response

If you believe your personal information may have been compromised in this breach:

• Carefully review any notice or communication you receive from Mercadien or a company that does business with Mercadien.
• Monitor financial accounts and credit reports for signs of identity theft.
• Consider placing fraud alerts or credit freezes with the major credit bureaus.
• Be cautious of unsolicited emails or phone calls requesting personal information.

To support those whose information may have been compromised, Mercadien has set up a dedicated call center at 855-403-1825, available Monday through Friday from 9 a.m. to 9 p.m. ET.