Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsData ExfiltratedCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

THORNBURG INVESTMENT MANAGEMENT, INC.

bd_94c827c06515004b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 13, 2021

Filed

Jan 12, 2022

To disclose

39 weeks

Affected

14state residents only

Linked

6 filings

Confidence

66%

Full breach record for THORNBURG INVESTMENT MANAGEMENT, INC. →

Thornburg Investment Management, Inc. notified the NH AG of unauthorized access to employee email accounts between March 29 and April 30, 2021, discovered April 13, 2021. Data potentially exposed included names, SSNs, and financial account info for 14 NH residents. Notice sent Jan 7, 2022. Response included forensic review, law enforcement notification, and 12 months of Equifax credit monitoring.

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Incident timeline

undetected · 15 days

discovery → filing · 39 weeks / 274 days

Mar 29, 2021

Begins

Apr 13, 2021

Discovered

Jan 12, 2022

Filed

vs. sector median

+31 wks slower

This filing is one of 6 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Indiana State AGbd_69f5df6975be89742022-01-07 · +5dVerified
Massachusetts State AGbd_a1ed418fcd6b26562022-01-07 · +5dVerified
Montana State AGbd_b2e15db64b4a5c152022-01-07 · +5dVerified
Maine State AGbd_e6d0b2bb474097362022-01-07 · +5dCandidate

Show 1 more filing ↓up to 22d gap

Maine State AGbd_ca2dc835fc9b5f492022-02-03 · +22dVerified

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: THORNBURG INVESTMENT MANAGEMENT, INC.
norm: thornburg investment management
Industry: Financial Servicesllm

Discovered: Apr 13, 2021
Breach occurred: Mar 29, 2021 – Apr 30, 2021
Undetected for: 15 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 7, 2022
Affected individuals: 14state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notified Office of the New Hampshire Attorney General
Initial access: phishing_link

During the incident: Promptly launched an investigation to determine the nature and scope of the incident
Completed a review of the at-risk contents of the email accounts with the assistance of third-party data mining specialists
Provided notice of the incident to various data owners and/or intermediaries
Notified law enforcement of the event
Providing access to credit monitoring services for twelve (12) months through Equifax
Changes made: Put in place additional measures aimed to prevent a phishing attempt or compromise of its email systems in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 39 weeks(274 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 5 states

View merged incident ↗

Indiana State AGJan 7 · first

Massachusetts State AGJan 7 · first

Montana State AGJan 7 · first

Maine State AGJan 7 · first

New Hampshire State AG+5d · this page

Maine State AG+27d

Pattern: first filing Jan 7 (IN), last Feb 3 (ME) — a 27-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/thornburg-investment-management-20220112.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 12, 2022
Raw hash: b56a86b7ea18eeffb71c4c2ca3eb1823cbb2939648807d06594459063f50a8ba

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entityTHORNBURG INVESTMENT MANAGEMENT, INC.

Incidentdiscovered Apr 13, 2021

Stated responsePromptly launched an investigation to determine the nature and scope of the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov