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ARTICLE · 09 NOVEMBER 2026

Mercadien PC Data Breach: What Information Was Exposed?

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Mercadien PC Certified Public Accountants, a New Jersey-based accounting and advisory firm, discovered a data breach in November 2025 that may have exposed sensitive personal and financial information including Social Security numbers, financial account details, and IRS PIN numbers. The firm has launched an investigation with law enforcement and cybersecurity experts to assess the scope and impact of the incident.

United StatesPrivacy
Morgan & Morgan
Morgan & Morgan

Mercadien PC Certified Public Accountants (“Mercadien”), a New Jersey accounting and advisory firm, has announced a data breach that may have exposed sensitive personal and financial information belonging to certain individuals. The firm discovered the incident on November 7, 2025, and launched an investigation.

What Happened in the Mercadien Data Breach?

Mercadien is based in Hamilton, New Jersey, and is known for its accounting and advisory services. After discovering the incident, the firm launched an investigation, involved law enforcement, and hired a national cybersecurity firm to assess and mitigate potential impacts.

Mercadien reported the breach to the Maine Attorney General and the Massachusetts Office of Consumer Affairs and Business Regulation in late December 2025. It also posted a data breach notice on its website.

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