HackingProfessional ServicesProfessional ServicesData ExfiltratedCustomer Data InvolvedIdentity (basic)Financial accountLowContained

Mercadien P.C. CPAs

bd_aea05dfcc088a1bf · schema v1 · pii pii-v1

Severity

Low

Discovered

Nov 7, 2025

Filed

Jul 20, 2026

To disclose

36 weeks

Affected

8state residents only

Linked

12 filings

Confidence

66%

Mercadien P.C. CPAs notified the NH AG of a supplemental data incident. An unauthorized actor accessed and acquired files between Sept 17 and Oct 9, 2025. Discovery occurred Nov 7, 2025. 8 NH residents were affected. Data included names and banking/transaction info. Systems were secured and investigation completed. Credit monitoring offered.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 51 days

discovery → filing · 36 weeks / 255 days

Sep 17, 2025

Begins

Nov 7, 2025

Discovered

Jul 20, 2026

Filed

vs. sector median

+17 wks slower

This filing is one of 12 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

California State AGbd_3c090c1ae9c357382026-10-12 · +84dVerified
Oregon State AGbd_9073a5be3f931a412026-10-12 · +84dVerified
Texas State AGbd_cc54cf6a9eb2d0c22026-10-13 · +85dVerified
Texas State AGbd_7b787e3dbbd82d8e2026-02-24 · +146dVerified

Show 6 more filings ↓up to 201d gap

South Carolina State AGbd_bb8b76494cae40c62026-02-23 · +147dVerified
Indiana State AGbd_5a136d8dad7a13462026-02-17 · +153dVerified
Nebraska State AGbd_9581ab095364e27d2026-02-17 · +153dVerified
Delaware State AGbd_b06b2f75cc90e4452026-02-17 · +153dVerified
New Hampshire State AGbd_6a472f77725ed7622026-01-05 · +196dVerified
Maine State AGbd_be4f63906a17f7282025-12-31 · +201dCandidate

Showing first 10 of 11 linked disclosures.

Name: Mercadien P.C. CPAs
norm: mercadien p c cpas
Domain: pierferd.com

Name: Mercadien P.C. CPAs
norm: mercadien p c cpas
Industry: Professional Servicesllm

Discovered: Nov 7, 2025
Breach occurred: Sep 17, 2025 – Oct 9, 2025
Undetected for: 51 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 10, 2026
Affected individuals: 8state-resident count only
Data types: Identity (basic)Financial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Supplemental Notification of Data Incident to New Hampshire Department of Justice

During the incident: Secured the computer systems involved
Commenced an investigation
Engaged an additional third party to complete a comprehensive review of the impacted data
Providing access to free credit monitoring
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 36 weeks(255 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 9 states

View merged incident ↗

Maine State AGDec 31 · first

New Hampshire State AG+5d

Indiana State AG+48d

Nebraska State AG+48d

Delaware State AG+48d

South Carolina State AG+54d

Texas State AG+55d

New Hampshire State AG+201d · this page

California State AG+285d

Oregon State AG+285d

Texas State AG+286d

Pattern: first filing Dec 31 (ME), last Oct 13 (TX) — a 286-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 11 — the full spread may be wider.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://mm.nh.gov/files/uploads/doj/remote-docs/mercadien-cpa-20260720.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 20, 2026
Raw hash: fdb3d4066730261a5816ceb51b4eecd1eab9a6bb241e964b756edb97516f8568

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityMercadien P.C. CPAs

Victim entityMercadien P.C. CPAs

Incidentdiscovered Nov 7, 2025

Stated responseSecured the computer systems involved

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov