HospitalityUnited States of America
MGM Resorts International is a hospitality organisation in Massachusetts. It appears on the Massachusetts Attorney General breach-notification register, the California Attorney General breach-notification register, the Washington State Attorney General breach-notification register and the Iowa Attorney General security breach notification list with 3 confirmed incidents; the most recent notice was filed on March 7, 2026.
Data as of September 12, 2026.
Governed by M.G.L. c. 93H. Notice to the Attorney General is required for a breach affecting any number of Massachusetts residents' personal information -- the statute sets no minimum count.
Note: the count is Massachusetts residents only, not a total.
The same incident was filed separately with 4 jurisdictions within a few days of each other (WA, CA, IA and MA) — shown here as one incident.
MA AG breach notification: 313,400 Massachusetts residents affected
sourceCA AG breach notification: an unknown number of California residents affected
sourceWA AG breach notification: 811,740 Washington residents affected
sourceIA AG breach notification: an unknown number of Iowa residents affected
sourceCA AG breach notification: an unknown number of California residents affected
sourceGoverned by RCW 19.255.010. Notice to the Attorney General is required when a breach affects more than 500 Washington residents.
Note: the count is Washington residents only, not a total.
Governed by Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.
Note: no affected-count is published on this register.
Governed by Iowa Code §715C.2. Notice to the Attorney General is required within five business days of notifying consumers, for a breach requiring notification to more than 500 Iowa residents.
Note: no affected-count is published on this register.
This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.