BreachCensus

Landmark Admin, LLC

United States of America

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 and the Washington State Attorney General breach-notification register with 3 confirmed incidents; the most recent notice was filed on October 23, 2024.

Data as of September 6, 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

  1. June 24, 2024
    Reported to regulator Regulator

    DE AG breach notification: 6,647 Delaware residents affected

    source
  2. October 23, 2024
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
  3. October 23, 2024
    Reported to regulator Regulator

    WA AG breach notification: 4,795 Washington residents affected

    source
  4. October 23, 2024
    Reported to regulator Regulator

    DE AG breach notification: 5,061 Delaware residents affected

    source
  5. April 11, 2025
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
  6. April 11, 2025
    Reported to regulator Regulator

    WA AG breach notification: 11,691 Washington residents affected

    source
What a Washington notice means

Required under 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

Required under 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 ↗

Confirmed incident

US-MA

Disclosed
June 27, 2024

Timeline

  1. June 27, 2024
    Reported to regulator Regulator

    MA AG breach notification: 6,563 Massachusetts residents affected

    source
What a Massachusetts notice means

Required under 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 ↗

Confirmed incident

US-MA

Disclosed
March 1, 2024

Timeline

  1. March 1, 2024
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source