HackingFinancial ServicesFinanceStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Government IDMediumContained

Mercadien, P.C.

bd_e800608fcd7bbdbe · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 7, 2025

Filed

Jul 16, 2026

To disclose

36 weeks

Affected

17state residents only

Confidence

65%

Full breach record for Mercadien, P.C. →

Pinnacle Financial Partners, Inc. notified Massachusetts residents of a data breach involving its third-party vendor, Mercadien, P.C. Unauthorized access occurred between September 17, 2025, and October 9, 2025, affecting customer names, addresses, and government identifiers. Pinnacle offered credit monitoring services. The incident was contained, and law enforcement was notified.

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Massachusetts clock✗ MA AG >90d36 weeks discovery → filing

Incident timeline

undetected · 51 days

discovery → filing · 36 weeks / 251 days

Sep 17, 2025

Begins

Nov 7, 2025

Discovered

Jul 16, 2026

Filed

vs. sector median

+27 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed17 affectedView incident

Name: Pinnacle Financial Partners, Inc.
norm: pinnacle financial
Domain: pnfp.com

Name: Mercadien, P.C.
norm: mercadien
Industry: Financial Servicesllm

Discovered: Nov 7, 2025
Breach occurred: Sep 17, 2025 – Oct 9, 2025
Undetected for: 51 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 16, 2026
Affected individuals: 17state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Engaged cybersecurity experts
Notified law enforcement
Took steps to investigate and secure their systems
Worked to identify potentially affected individuals
Provided notice as quickly as possible
Arranged to offer you 12/24 months of credit monitoring and identity protection services through IDX
Changes made: Review and enhance our security practices, including oversight of third-party service providers
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 36 weeks(251 days from discovery to filing)
Compliance flags: MA AG >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

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://www.mass.gov/doc/2026-1157-pinnacle-financial-partners-inc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 16, 2026
Raw hash: 59633c127f2ec8bd250bfe641eabb13c1e5d09d0eeafab2b304a82cd13f11524

Reporting entityPinnacle Financial Partners, Inc.

Victim entityMercadien, P.C.

Incidentdiscovered Nov 7, 2025

Stated responseEngaged cybersecurity experts

ComplianceMA AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov