BreachCensus

OSI Systems, Inc.

TechnologyUnited States of America

OSI Systems, Inc. is a technology organisation in Washington. 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 Texas Attorney General breach-notification register with 1 confirmed incident; the most recent notice was filed on March 11, 2026.

Headquarters
Hawthorne, United States
ISIN
US6710441055
LEI
DDX3MPX1Y8YD30050X33
Wikidata
Q7073021

Data as of September 6, 2026.

Confirmed incident

Filed in WA, CA, MA and TX — Ransomware Attack

The same incident was filed separately with 4 jurisdictions within a few days of each other (WA, CA, MA and TX) — shown here as one incident.

Occurred
December 23, 2025
Disclosed
March 11, 2026
Records affected
4,910

Timeline

  1. March 11, 2026
    Reported to regulator Regulator

    MA AG breach notification: 494 Massachusetts residents affected

    source
  2. March 11, 2026
    Reported to regulator Regulator

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

    source
  3. March 11, 2026
    Reported to regulator Regulator

    WA AG breach notification: 538 Washington residents affected

    source
  4. March 12, 2026
    Reported to regulator Regulator

    TX AG breach notification: 386 Texas residents affected

    source
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 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 ↗

What a Texas notice means

Governed by Tex. Bus. & Com. Code §521.053. Notice to the Attorney General is required when a breach affects at least 250 Texas residents.

Note: the published count is a total, not limited to Texas residents.

Texas breach-notification register ↗