Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDMediumContained

LADENBURG THALMANN & CO. INC.

bd_f61d7d07b7cf0353 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Mar 25, 2026

Filed

Sep 24, 2026

To disclose

26 weeks

Affected

14state residents only

Linked

3 filings

Confidence

69%

Full breach record for LADENBURG THALMANN & CO. INC. →2 incidents on file

Ladenburg Thalmann & Co. Inc. notified the NH Attorney General of a phishing incident involving one employee's email account. Unauthorized access occurred between February 28, 2026, and March 25, 2026, when the incident was identified. Investigation determined that the name, Social Security number, and/or driver's license number of 14 New Hampshire residents were accessed. Notification letters were mailed on September 24, 2026, and one year of complimentary credit monitoring is being offered.

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Incident timeline

undetected · 25 days

discovery → filing · 26 weeks / 183 days

Feb 28, 2026

Begins

Mar 25, 2026

Discovered

Sep 24, 2026

Filed

vs. sector median

+18 wks slower

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

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Indiana State AGbd_27980a214789f1072026-09-24Verified
Vermont State AGbd_e22a5abddebdf7432026-09-24Candidate

Name: LADENBURG THALMANN & CO. INC.
norm: ladenburg thalmann

Name: LADENBURG THALMANN & CO. INC.
norm: ladenburg thalmann
Industry: Financial Servicesllm

Discovered: Mar 25, 2026
Breach occurred: Feb 28, 2026 – Mar 25, 2026
Undetected for: 25 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 24, 2026
Affected individuals: 14state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: External
Regulator citations: Notified the New Hampshire Attorney General's Office
Initial access: phishing_link

During the incident: Took steps to secure the email account
Commenced an investigation
Reviewed emails, attachments, and files that may have been accessed
Mailed notification letters to the New Hampshire residents via United States First-Class mail
Offering one year of complimentary credit monitoring to the individuals whose information was involved
Established a dedicated call center that individuals can call with questions about the incident
Changes made: Implemented additional safeguards and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 26 weeks(183 days from discovery to filing)
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 ↗

Indiana State AGSep 24 · first

Vermont State AGSep 24 · first

New Hampshire State AGSep 24 · 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/ladenburg-thalmann-co-20260924.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 24, 2026
Raw hash: 65ee25d998649771662268c17b103009d99d85fc3d001503711101ac97897c9d

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityLADENBURG THALMANN & CO. INC.

Victim entityLADENBURG THALMANN & CO. INC.

Incidentdiscovered Mar 25, 2026

Stated responseTook steps to secure the email account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov