Home › Organisations › Landmark Admin, LLC Landmark Admin, LLC is an 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 Delaware Attorney General data security breach database with 3 confirmed incidents; the most recent notice was filed on October 23, 2024.
Data as of October 17, 2026.
Confirmed incident Filed in WA, CA and DE — Ransomware Attack The same incident was filed separately with 3 jurisdictions within a few days of each other (WA, CA and DE) — shown here as one incident.
Occurred May 13, 2024 Disclosed October 23, 2024 Timeline June 24, 2024
Reported to regulator Regulator DE AG breach notification: 6,647 Delaware residents affected
source June 24, 2024
Reported to regulator Regulator DE AG breach notification: 6,647 Delaware residents affected
source June 24, 2024
Reported to regulator Regulator DE AG breach notification: 6,647 Delaware residents affected
source October 23, 2024
Reported to regulator Regulator CA AG breach notification: an unknown number of California residents affected
source October 23, 2024
Reported to regulator Regulator WA AG breach notification: 4,795 Washington residents affected
source October 23, 2024
Reported to regulator Regulator DE AG breach notification: 5,061 Delaware residents affected
source October 23, 2024
Reported to regulator Regulator DE AG breach notification: 5,061 Delaware residents affected
source October 23, 2024
Reported to regulator Regulator DE AG breach notification: 5,061 Delaware residents affected
source April 11, 2025
Reported to regulator Regulator CA AG breach notification: an unknown number of California residents affected
source April 11, 2025
Reported to regulator Regulator WA AG breach notification: 11,691 Washington residents affected
source Litigation Possible litigation — multiple candidate dockets found, not yet resolved to a single case. What a Washington notice means Governed 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.
Washington breach-notification register ↗
What a California notice means 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.
California breach-notification register ↗
What a Delaware notice means Governed by 6 Del. C. §12B-102 . Notice to the Attorney General is required when a breach affects more than 500 Delaware residents.
Note: the count is Delaware residents only, not a total.
Delaware breach-notification register ↗
Disclosed June 27, 2024 Timeline June 27, 2024
Reported to regulator Regulator MA AG breach notification: 6,563 Massachusetts residents affected
source Litigation Possible litigation — multiple candidate dockets found, not yet resolved to a single case. What a Massachusetts notice means 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.
Massachusetts breach-notification register ↗
Disclosed March 1, 2024 Timeline March 1, 2024
Reported to regulator Regulator MA AG breach notification: 1 Massachusetts residents affected
source Litigation Possible litigation — multiple candidate dockets found, not yet resolved to a single case.