Mercadien PC Certified Public Accountants
bd_6a472f77725ed762 · schema v1 · pii pii-v1
Full breach record for Mercadien PC Certified Public Accountants →Mercadien PC, a CPA firm, notified the New Hampshire Department of Justice of a data security incident discovered on November 7, 2025. Unauthorized access occurred between September 17 and October 9, 2025. The investigation is ongoing, and the number of affected individuals is currently unknown. Law enforcement was notified, and forensic experts are engaged. Remediation includes password resets and deploying SentinelOne.
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Incident timeline
Sep 17, 2025
Begins
Nov 7, 2025
Discovered
Jan 5, 2026
Filed
Linked disclosures
Why this link?Regulatory filings (8) · sorted by filing gap
- Maine State AGbd_be4f63906a17f7282025-12-31 · +5dCandidate
- Massachusetts State AGbd_e681ed6e473e0a2f2025-12-24 · +12dVerified
- Indiana State AGbd_5a136d8dad7a13462026-02-17 · +43dVerified
- Nebraska State AGbd_9581ab095364e27d2026-02-17 · +43dVerified
Show 4 more filings ↓Show fewer ↑up to 196d gap
- Delaware State AGbd_b06b2f75cc90e4452026-02-17 · +43dVerified
- South Carolina State AGbd_bb8b76494cae40c62026-02-23 · +49dVerified
- Texas State AGbd_7b787e3dbbd82d8e2026-02-24 · +50dVerified
- New Hampshire State AGbd_aea05dfcc088a1bf2026-07-20 · +196dVerified
Filing propagation · 9 filings · 8 states
View merged incident ↗Pattern: first filing Dec 24 (MA), last Jul 20 (NH) — a 208-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.