Verified Breach

Apr 12, 2026 Breach Date

1,837,078 Accounts Affected

6 Data Types Exposed

May 3, 2026 Added to HIBP

About This Breach

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".

Compromised Data Types

Email addresses Employers Job titles Names Phone numbers Physical addresses

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1. Purpose: This tool checks whether your email address has appeared in publicly known data breaches via the Have I Been Pwned (HIBP) API.

2. Data Collection: Your email address is submitted to HIBP for breach lookup. If lead capture is enabled, your email may also be stored locally for service communication. Your IP address is recorded alongside it and used for rate limiting and abuse prevention. Past the daily limit of free checks, you will be asked for your email address and a 6-digit code we send to it; free checks are counted per IP address, stored in hashed form, for the day.

3. Third-Party Service: This tool relies on Have I Been Pwned (haveibeenpwned.com), an external service. Your email is transmitted to their API. Their privacy policy applies.

4. No Warranty: Results reflect data publicly known at the time of check. Absence does not guarantee your email has never been compromised; presence does not necessarily mean current risk.

5. Email Verification: Submitted addresses may be validated using automated checks (format, MX records, third-party verification services).

6. Data Retention & Privacy: Locally stored data is kept for 90 days and then deleted automatically. Breach monitoring and newsletter subscriptions are kept until you unsubscribe. We do not sell or share personal data with unrelated third parties.

7. Acceptable Use: This tool is provided for personal and business security awareness. Do not use it to check email addresses you do not own or are not authorized to verify.

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Marcus & Millichap Data Breach

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