People search Marcus & Millichap data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 1 Marcus & Millichap-linked incident, with headline counts up to 1.8M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Marcus & Millichap breach history matters
Marcus & Millichap operates in Real Estate (United States). Across indexed rows, recurring themes include ransomware and extortion. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2026 — Marcus & Millichap - ShinyHunters extortion leak; 1.8M unique emails
Unverified claim — treat actor counts cautiously. Have I Been Pwned added Marcus & Millichap on May 3, 2026 after the commercial real estate brokerage was named in a ShinyHunters pay-or-leak extortion campaign. HIBP said data alleged to have been obtained from the company was later released publicly and contained 1.8 million unique email addresses plus names, phone numbers, employer, job title, and physical company address. Marcus & Millichap stated in its disclosure that potentially accessed data appeared limited to company forms, templates, marketing materials, Exposed categories include Email addresses, names, phone numbers, employers, job titles, and physical company addresses. BreachHistory cites approximately 1.8M+ affected records in this row. See the marcus-millichap2026-shinyhunters and canonical BreachHistory entry.
Patterns and analysis
- Ransomware and extortion — appears across multiple Marcus & Millichap catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Bookmark the Marcus & Millichap company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/marcus-millichap · Latest: marcus-millichap2026-shinyhunters.
Sources: BreachHistory catalog (1 row for Marcus & Millichap), company and regulator disclosures cited in individual breach records.