Marcus & Millichap, Inc. 2026 Data Breach
Business Services / Commercial Real Estate Brokerage & Investment Services / Investment sales and financing / United States & Canada
Marcus & Millichap, Inc. 2026 Data Breach
Leading US commercial real estate brokerage specializing in investment sales, financing and advisory, founded 1971, offices across the US and Canada.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
54/100
Lower riskHigher risk
Moderate: notable exposure with meaningful misuse potential.
Data Sensitivity i
StandardExposed data is largely lower-sensitivity. Standard identity-protection precautions are advised.
8.5M rowsRecords
2026Year
The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.
Breach Summary
In April 2026, Marcus & Millichap was compromised through ShinyHunters' Salesforce social-engineering campaign. ShinyHunters claimed about 30 million records; roughly 1.8 million unique accounts were indexed by Have I Been Pwned, and this entry tracks about 8.5 million circulating records. The company stated the exposed data did not include Social Security numbers or financial-account information, limiting the confirmed set to business contact-type data.
Full threat analysis, exploitation vectors, and principal guidance below.
11 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…
8.5M rows records analyzed
About Marcus & Millichap, Inc.
Marcus & Millichap is a leading US commercial real estate brokerage specializing in investment sales, financing, research and advisory services, founded in 1971 and headquartered in Calabasas, California. It operates through offices across the US and Canada, connecting private and institutional investors in commercial-property transactions.
Why They Hold Your Data
As a commercial real estate investment brokerage, Marcus & Millichap holds investor, client and employee records including names, business contact details and transaction/deal data, largely managed in CRM platforms such as Salesforce; the company states no Social Security numbers or financial-account data were involved in this incident.
Recent Developments
Marcus & Millichap confirmed a breach in the 2026 ShinyHunters Salesforce campaign, with data dated around April 2026; ShinyHunters claimed roughly 30 million records. The firm reported that no Social Security numbers or financial data were exposed and continues normal operations.
Data Points Exposed
5 verified field types
Date of Birth High
Email Address
Full Name
Phone Number
Transaction History (purchase)
Breach Impact
The breach exposes a large base of commercial-property investors, clients and employees to business-impersonation and phishing risk, including wire-fraud lures in active transactions. While the absence of SSN and financial data lowers direct identity-theft severity, the scale and the value of the counterparties keep business-email-compromise and targeting risk elevated; the incident carries multi-jurisdiction notification exposure.
Principal Risk Advisory
What this means for a principal
A consumer-service breach: contact and account data supports phishing, account takeover and profile enrichment. For a high-profile principal the main risk is credible impersonation and enrichment of existing exposure.
What You Should Do
- Guard against SIM-swap and vishing: add a carrier port-out PIN and verify any 'support' calls independently.
- Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.
How ObscureIQ Can Help
- Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
- Exposure mapping and footprint neutralization: cross-reference against broker-available data and suppress still-removable elements, prioritizing address and phone, since this record re-seeds broker networks.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
S
Threat Actor: ShinyHuntersConfidence: High
Motivation: Financial extortion, data sale
A prolific data theft and extortion group that began as a database theft and resale actor and evolved toward SaaS-focused extortion. Recent activity involves vishing, credential harvesting, SSO compromise, and theft of customer data from cloud and SaaS environments.
This breach is linked to the ShinyHunters / Scattered Lapsus$ Hunters - Salesforce (2025-26) campaign. See the full campaign analysis →
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