HackingFinancial ServicesFinanceCustomer Data InvolvedIdentity (basic)Financial accountFinancial credentialsMedium

MUFG Investor Services (US), LLC

bd_e18bfc42dc707a2e · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 27, 2022

Filed

Jun 27, 2022

To disclose

4 weeks

Affected · nationwide

1,4591 in this filing

Confidence

65%

Full breach record for MUFG Investor Services (US), LLC →

MUFG Investor Services (US), LLC, a financial services company, reported an external system breach (hacking) that occurred in late December 2021. The breach was discovered on May 27, 2022, and affected 1,459 individuals. The compromised information included names and financial account numbers with associated security codes or PINs. The company notified affected individuals on June 24, 2022, and offered two years of credit monitoring and identity theft protection services through Experian.

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Maine clockDiscovered May 27, 2022 → Filed with AG Jun 27, 202231d ⏱ ME AG >30d4 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 158 days

discovery → filing · 4 weeks / 31 days

Dec 20, 2021

Begins

May 27, 2022

Discovered

Jun 27, 2022

Filed

vs. sector median

4 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1,459 affectedView incident

Name: GUGGENHEIM PARTNERS INVESTMENT MANAGEMENT, LLC
norm: guggenheim partners investment management

Name: MUFG Investor Services (US), LLC
norm: mufg investor services us
Industry: Financial Servicesllm

Discovered: May 27, 2022
Breach occurred: Dec 20, 2021 – Dec 31, 2021
Undetected for: 158 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 24, 2022
Affected individuals: 1,459state + nationwide
Data types: Identity (basic)Financial accountFinancial credentials
Data elements: Financial account number
Attack vector: Unauthorized Access

During the incident: Notified consumers in writing
Offered 2 years of credit monitoring, up to $1 million of identity theft insurance, and identity theft restoration through Experian
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 4 weeks(31 days from discovery to filing)
Compliance flags: ME AG >30d · 31d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: May 27, 2022
→ Filed with AG: Jun 27, 2022
31d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 27, 2022 → Filed with AG: Jun 27, 2022	31d	30 days (soft)	ME AG >30d

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.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/e5ca1108-fa24-4216-924e-7206dad2d644.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 27, 2022
Raw hash: c4a2233bc1aa6d25d17712a57c47e3c744cd01cc8bac17fe1fd90a9dbc03dbb4

Reporting entityGUGGENHEIM PARTNERS INVESTMENT MANAGEMENT, LLC

Victim entityMUFG Investor Services (US), LLC

Incidentdiscovered May 27, 2022

Stated responseNotified consumers in writing

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov