HackingFinancial ServicesFinanceStolen CredentialsCustomer Data InvolvedPIIIdentity (basic)LowContained

BLACKSTONE INC.

bd_85142d79f7915c82 · schema v1 · pii pii-v2

Severity

Low

Discovered

Jul 23, 2026

Filed

Sep 1, 2026

To disclose

—

Affected

17state residents only

Confidence

68%

Full breach record for BLACKSTONE INC. →

Blackstone Inc. experienced a cybersecurity incident on July 23, 2026, where an unauthorized party briefly accessed a small number of employee user accounts and obtained copies of files from cloud-based repositories. Personal information of some individuals was affected. Blackstone stopped the access, engaged outside experts, notified law enforcement, and is offering two years of identity monitoring via Kroll. The incident is contained.

J jump to incidentP pin to compareR raw source

Incident timeline

Jul 23, 2026

Begins

Jul 23, 2026

Discovered

Sep 1, 2026

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed17 affectedView incident

Name: BLACKSTONE INC.
norm: blackstone

Name: BLACKSTONE INC.
norm: blackstone
Industry: Financial Servicesllm

Discovered: Jul 23, 2026
Breach occurred: Jul 23, 2026
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 17state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Regulator citations: Reported the matter to law enforcement
Initial access: valid_credentials

During the incident: Promptly took steps to stop the access
Conducted an investigation with the assistance of outside data security experts
Reported the matter to law enforcement
Engaged Kroll to provide 2 years of identity monitoring services at no cost
Changes made: Taken a range of steps to enhance our existing security controls
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

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.mass.gov/doc/2026-1669-blackstone-inc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 1, 2026
Raw hash: e69b2daed1339d10c25cedb8c9696c68bec41f8904b1ea42a9d0355cca4d3fcc

Reporting entityBLACKSTONE INC.

Victim entityBLACKSTONE INC.

Incidentdiscovered Jul 23, 2026

Stated responsePromptly took steps to stop the access

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov