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Response snapshot Oct 27, 2026, 07:16 UTC

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Disclosed incidenthibp-marcusmillichap

Marcus & Millichap breach: 1,837,078 accounts exposed

In April 2026, the commercial real estate brokerage firm Marcus & Millichap was named as one of multiple alleged victims of the ShinyHunters hacking and extortion group . Data alleged to have been obtained from the company was subsequently released publicly and included 1.

At a glance

Sources
2 independent sources

What to do

If you or your organization used this service, change reused passwords, watch for phishing that uses the exposed data, and check the disclosure for the organization's guidance.

Read Have I Been Pwned: Marcus & Millichap (opens a new tab)

What happened

In April 2026, the commercial real estate brokerage firm Marcus & Millichap was named as one of multiple alleged victims of the ShinyHunters hacking and extortion group . Data alleged to have been obtained from the company was subsequently released publicly and included 1.

8M unique email addresses, along with names, phone numbers and employment-related information including employer, job title and physical company address. In their disclosure notice , Marcus & Millichap advised that data which may have been accessed appeared limited to "company forms, templates, marketing materials, and general contact information".

Related technology

Sources

  1. Primary source

    Have I Been Pwned: Marcus & Millichap (opens a new tab)

    Verified breach loaded into Have I Been Pwned: account count, exposed data types, and dates.

    Published Checked

  2. Primary source

    Marcus & Millichap disclosure (opens a new tab)

    The organization's own breach disclosure, as linked by Have I Been Pwned.

    Published Date not suppliedChecked

  3. Primary source

    Have I Been Pwned breach API (opens a new tab)

    The breach list that supplied this entry.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, May 3). Marcus & Millichap breach: 1,837,078 accounts exposed. https://kevwire.com/record/hibp-marcusmillichap

MLA

"Marcus & Millichap breach: 1,837,078 accounts exposed." KEVWire, 3 May 2026, kevwire.com/record/hibp-marcusmillichap.

Chicago

KEVWire. "Marcus & Millichap breach: 1,837,078 accounts exposed." Last modified May 3, 2026. https://kevwire.com/record/hibp-marcusmillichap.

Evidence summary (plain text)

Marcus & Millichap breach: 1,837,078 accounts exposed (May 3, 2026).
In April 2026, the commercial real estate brokerage firm Marcus & Millichap was named as one of multiple alleged victims of the ShinyHunters hacking and extortion group . Data alleged to have been obtained from the company was subsequently released publicly and included 1.8M unique email addresses, along with names, phone numbers and employment-related information including employer, job title and physical company address. In their disclosure notice , Marcus & Millichap advised that data which may have been accessed appeared limited to "company forms, templates, marketing materials, and general contact information".
Sources:
Have I Been Pwned: Marcus & Millichap: https://haveibeenpwned.com/Breach/MarcusMillichap
Marcus & Millichap disclosure: https://www.marcusmillichap.com/news-events/press/2026/04/marcus-millichap-releases-information-regarding-cybersecurity-incident
Have I Been Pwned breach API: https://haveibeenpwned.com/api/v3/breaches
Record ID: hibp-marcusmillichap.
Record origin: Ingested record.
AI evidence: Not assessed.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 06:25 UTC. Ingestion is not an independent editorial investigation.

Verified by Have I Been Pwned. Breach date: 2026-04-12; loaded 2026-05-03. Exposed data: Email addresses, Employers, Job titles, Names, Phone numbers, Physical addresses. Counts are accounts in the loaded data, not necessarily distinct people.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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