Marcus & Millichap

Medium

Data breach — April 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".

1.8M

Records exposed

2026

Year

Data types

Free

To check

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Quick answer — was Marcus & Millichap breached?

Yes. Marcus & Millichap was breached in April 2026, exposing 1,837,078 records including email addresses, employers, job titles. This breach has been independently verified. If your email was involved, your data may still be at risk today. Check if you were affected.

What happened in the Marcus & Millichap data breach?

The exposed data included 6 types of personal information. Learn more about what a data breach means for you.

Why was the Marcus & Millichap breach so dangerous?

The Marcus & Millichap breach exposed 1,837,078 records — 1.8M people whose personal data is now circulating in criminal markets.

Don't wait to find out — check if your email was exposed in this breach.

What data was stolen in the Marcus & Millichap breach?

Email addresses Employers Job titles Names Phone numbers Physical addresses

Email addresses — used for phishing attacks and credential stuffing against your other accounts

Employers — may be combined with other breach data to build a profile for targeted attacks

Job titles — may be combined with other breach data to build a profile for targeted attacks

Names — used to build profiles and target you with personalised scams

Phone numbers — enables SIM-swapping attacks and targeted SMS phishing

Physical addresses — combined with other data, used for identity theft and physical fraud

Is the Marcus & Millichap breach still dangerous in 2026?

Yes. Stolen data from the Marcus & Millichap breach remains dangerous years after the incident. Attackers routinely compile data from multiple breaches to build complete profiles, and credentials from 2026 are still actively used in automated attacks today.

Personal information like email addresses, phone numbers, and dates of birth does not expire. Even if you changed your Marcus & Millichap password, the other exposed data can be combined with information from other breaches to target you. Learn how long stolen data stays dangerous.

What to do if your email was in the Marcus & Millichap breach

Change your Marcus & Millichap password immediately

Log into Marcus & Millichap and change your password to something strong and unique — one you have never used anywhere else.

Change any account sharing that password

If you reused this password elsewhere, change it on every affected account. Attackers test stolen credentials against hundreds of popular sites within hours.

Enable two-factor authentication

Turn on 2FA on Marcus & Millichap and every important account. Even if your password is known, attackers cannot access the account without the second factor.

Check your other accounts for this breach

Run a full email scan to see every breach your address appears in — not just this one.

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Frequently asked about the Marcus & Millichap breach

How many people were affected by the Marcus & Millichap data breach?

Approximately 1,837,078 user records were exposed in the Marcus & Millichap breach in April 2026.

Is the Marcus & Millichap breach still a risk in 2026?

Yes. Leaked credentials are actively used in credential-stuffing attacks years after a breach. If you reused your Marcus & Millichap password elsewhere and have not changed it, those accounts remain at risk today.

How do I check if my email was in the Marcus & Millichap breach?

Enter your email in the free checker on EmailLeaked. We scan millions of breach records including the Marcus & Millichap dataset and tell you instantly whether your email was exposed and what data was taken.

What should I do if I was in the Marcus & Millichap breach?

Change your Marcus & Millichap password immediately, update any account where you used the same password, enable two-factor authentication on all important accounts, and monitor for phishing emails over the next 90 days.

How this breach page is reviewed

Breach pages are built from structured breach records and reviewed for practical risk guidance by EmailLeaked. Risk labels reflect exposed data types and are intended to help readers prioritise action.

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