HackingRetail & ConsumerRetailData ExfiltratedIdentity (basic)Government IDMediumContained

SOTHEBY'S

bd_9d993dd442d3ccba · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 24, 2025

Filed

Oct 15, 2025

To disclose

12 weeks

Affected

1state residents only

Linked

4 filings

Confidence

67%

Full breach record for SOTHEBY'S →

Sotheby’s notified the New Hampshire Attorney General on October 15, 2025, of a data event affecting one NH resident. On July 24, 2025, Sotheby’s became aware that data appeared to have been removed by an unknown actor. The affected data included the resident's name and Social Security number. Sotheby’s engaged third-party specialists, worked with federal law enforcement, and offered 12 months of credit monitoring via TransUnion.

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Incident timeline

discovery → filing · 12 weeks / 83 days

Jul 24, 2025

Discovered

Oct 15, 2025

Filed

vs. sector median

+2 wks slower

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

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Massachusetts State AGbd_45f84b00cb19d0752025-10-15Verified
Vermont State AGbd_4bd73b04199aa29b2025-10-15Verified
Maine State AGbd_84da0953b8865c3d2025-10-15Candidate

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: SOTHEBY'S
norm: sotheby s
Domain: sothebys.com
Industry: Retail & Consumerllm

Discovered: Jul 24, 2025
Materiality determined: —
Notification sent: Oct 15, 2025
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notified Office of the New Hampshire Attorney GeneralNotified three major credit reporting agencies (Equifax, Experian, TransUnion)

During the incident: Began an investigation to determine what data was involved
Downloaded and cataloging the data with instruction by third-party specialists
Comprehensive review of the data
Assessing the security of Sotheby’s systems
Identifying and validating the data involved
Working with federal law enforcement
Identifying potentially impacted individuals for purposes of providing notice
Providing written notice of the Event to relevant regulatory authorities
Providing written notice of the Event to the three major credit reporting agencies
Changes made: Offering complimentary credit monitoring services for twelve (12) months through TransUnion
Providing guidance on how to better protect against identity theft and fraud
Advising individuals to report any suspected incidents of identity theft or fraud to their credit card company and/or bank
Providing information on how to place a fraud alert and security freeze on one’s credit file
Continuing to review safeguards and consider further enhancements
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 12 weeks(83 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 ↗

Massachusetts State AGOct 15 · first

Vermont State AGOct 15 · first

Maine State AGOct 15 · first

New Hampshire State AGOct 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/sothebys-20251015.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 15, 2025
Raw hash: 3fb1c643742008cbec07f1fbf6c458f363de15c63b31396d29caac1b5d632c14

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entitySOTHEBY'S

Incidentdiscovered Jul 24, 2025

Stated responseBegan an investigation to determine what data was involved

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov