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

Pinnacle Financial Partners, Inc.

bd_e800608fcd7bbdbe · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Jul 16, 2026

To disclose

—

Affected

17state residents only

Linked

3 filings

Confidence

65%

Full breach record for Pinnacle Financial Partners, Inc. →

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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Incident timeline

Sep 17, 2025

Begins

Jul 16, 2026

Filed

This filing is one of 3 filings about the same incident.View merged incident

Part of Mercadien, P.C. supply-chain incident (2026) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Vermont State AGbd_3761e4d2e707c4a82026-07-16Candidate
Nebraska State AGbd_90aeefc78a67afbd2026-07-16Verified

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

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

Discovered: —
Breach occurred: Sep 17, 2025 – Oct 9, 2025
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
Third party: via Mercadien, P.C., CPAs
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.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Vermont State AGJul 16 · first

Nebraska State AGJul 16 · first

Massachusetts State AGJul 16 · first · this page

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

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityPinnacle Financial Partners, Inc.

Victim entityPinnacle Financial Partners, Inc.

IncidentUnauthorized Access

Stated responseEngaged cybersecurity experts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov