HackingFinancial ServicesFinanceData MishandlingSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

The Washington Trust Company, of Westerly

bd_2c9c1cdf869b9511 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Oct 27, 2025

Filed

Dec 15, 2025

To disclose

7 weeks

Affected

42state residents only

Linked

4 filings

Confidence

66%

Full breach record for The Washington Trust Company, of Westerly →3 incidents on file

The Washington Trust Company of Westerly notified the NH Attorney General of a data event involving its third-party marketing vendor, Marquis Software Solutions. Unauthorized access occurred on or about August 14, 2025, affecting customer data (names, DOB, SSN, financial accounts). 42 NH residents were notified on Dec 15, 2025; ~4,882 RI residents also impacted. Credit monitoring offered.

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Incident timeline

undetected · 74 days

discovery → filing · 7 weeks / 49 days

Aug 14, 2025

Begins

Oct 27, 2025

Discovered

Dec 15, 2025

Filed

vs. sector median

1 wks faster

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Nebraska State AGbd_2f4c9b5c9d42f0952025-12-15Verified
Massachusetts State AGbd_9d359c93fef1679d2025-12-15Verified
Maine State AGbd_f4ca4a9f0a2e0e522025-12-15Candidate

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: The Washington Trust Company, of Westerly
norm: the washington trust company of westerly
Domain: washtrust.co
Industry: Financial Servicesllm

Discovered: Oct 27, 2025
Breach occurred: Aug 14, 2025
Undetected for: 74 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 15, 2025
Affected individuals: 42state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1041 Exfiltration Over C2 Channel
Threat actor: Partner
Initial access: supply_chain

During the incident: Provided access to credit monitoring services for twelve (12) months, through Cyberscout, a Transunion company
Established a dedicated toll-free assistance line
Provided written notice of this incident to relevant state and federal regulators, as necessary
Provided written notice to the three major credit reporting agencies, Equifax, Experian, and TransUnion
Changes made: Offering 12 Months of complimentary access to credit monitoring services through Cyberscout, a TransUnion company
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(49 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Nebraska State AGDec 15 · first

Massachusetts State AGDec 15 · first

Maine State AGDec 15 · first

New Hampshire State AGDec 15 · 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://mm.nh.gov/files/uploads/doj/remote-docs/washington-trust-westerly-marquis-software-solutions-20251215.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 15, 2025
Raw hash: 870405055ece5874baf62ba4b1d394c451326110d4d375effbcb1ca571a7c4f2

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entityThe Washington Trust Company, of Westerly

Incidentdiscovered Oct 27, 2025

Stated responseProvided access to credit monitoring services for twelve (12) months, through Cyberscout, a Transunion company

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov