Largest breaches
The 100 largest confirmed incidents on file, ranked by records affected. records_affected is always the TOTAL figure reported by the source document for that incident — a US state attorney general’s state-resident notification count is never used here, and is never summed into it. See Methodology for how the two figures are kept separate.
| Organization | Records affected | Disclosed | Jurisdiction | Source |
|---|---|---|---|---|
| Change Healthcare Inc. | 192,700,000 | October 14, 2025 | US-TX | Regulator |
| Conduent Business Services, LLC (revised submission) | 62,486,662 | May 20, 2026 | US-TX | Regulator |
| Conduent Business Services LLC | 62,224,658 | October 8, 2025 | US-NJ | Regulator |
| DriveWealth | 30,000,000 | September 30, 2026 | US-CA | Regulator |
| Aflac Incorporated | 22,653,844 | December 22, 2025 | US-TX | Regulator |
| Cerner Corporation | 18,565,730 | July 25, 2025 | US-WA | Regulator |
| DentaQuest, LLC | 15,000,000 | July 16, 2026 | US-MA | Regulator |
| DentaQuest, LLC | 15,000,000 | July 16, 2026 | US-WA | Regulator |
| Aflac Incorporated (“Aflac”) | 13,924,906 | August 8, 2025 | US-GA | Regulator |
| Prosper Marketplace, Inc | 13,076,476 | December 10, 2025 | US-TX | Regulator |
| IDScan.net | 13,000,000 | September 21, 2026 | US-TX | Regulator |
| Aesto, LLC | 9,540,683 | July 31, 2026 | US-AL | Regulator |
| iRhythm Technologies Inc. | 8,179,772 | October 6, 2026 | US-TX | Regulator |
| AssuranceAmerica Managing General Agency, LLC | 6,998,886 | June 17, 2026 | US-WA | Regulator |
| TriZetto Provider Solutions | 6,974,232 | February 6, 2026 | US-WA | Regulator |
| Episource, LLC | 6,725,572 | June 6, 2025 | US-CA | Regulator |
| Episource, LLC | 6,725,572 | June 6, 2025 | US-WA | Regulator |
| Carnival Corporation | 5,995,277 | May 27, 2026 | US-CA | Regulator |
| 700Credit, LLC | 5,836,521 | December 16, 2025 | US-TX | Court |
| TransUnion LLC | 4,461,511 | September 4, 2025 | US-TX | Regulator |
| Heights Finance Holdings Co. | 4,132,834 | August 14, 2026 | US-TX | Regulator |
| AdaptHealth Corp. | 4,115,802 | July 2, 2026 | US | Self report |
| AdaptHealth Corp. | 4,115,802 | August 14, 2026 | US-CA | Regulator |
| Unlimited Technology Systems, LLC | 3,836,316 | July 21, 2026 | US-WA | Regulator |
| Medtronic Inc. | 3,834,294 | June 29, 2026 | US-WA | Regulator |
| Unlimited Technology Systems, LLC | 3,803,750 | July 21, 2026 | US-OH | Regulator |
| CareCloud, Inc. | 3,756,469 | July 24, 2026 | US-NJ | Regulator |
| CareCloud, Inc. | 3,756,469 | August 18, 2026 | US-TX | Regulator |
| University of Phoenix, Inc. | 3,489,274 | December 21, 2025 | US-WA | Regulator |
| TriZetto Provider Solutions | 3,433,965 | February 6, 2026 | US-MO | Regulator |
| Texas Parks and Wildlife | 3,187,000 | June 26, 2026 | US-TX | Regulator |
| QualDerm Partners, LLC | 3,117,874 | February 22, 2026 | US-TN | Regulator |
| QualDerm Partners, LLC | 3,117,874 | February 23, 2026 | US-WA | Regulator |
| Columbia University | 3,067,242 | August 7, 2025 | US-WA | Regulator |
| PIH Health, Inc. | 2,947,264 | January 31, 2025 | US-CA | Regulator |
| Baylor Genetics | 2,810,878 | August 18, 2026 | US-TX | Regulator |
| Baylor Genetics | 2,810,878 | August 14, 2026 | US-TX | Regulator |
| Navia Benefit Solutions, Inc. | 2,697,540 | March 18, 2026 | US-WA | Regulator |
| DaVita Inc. | 2,689,826 | August 1, 2025 | US-CO | Regulator |
| Veradigm LLC | 2,672,036 | September 22, 2025 | US-IL | Regulator |
| Veradigm LLC | 2,672,036 | December 2, 2025 | US-WA | Regulator |
| Xsolis, Inc. | 2,523,302 | June 19, 2026 | US-WA | Regulator |
| Nacogdoches Memorial Hospital n | 2,507,073 | March 30, 2026 | US-TX | Regulator |
| Navia Benefit Solutions, Inc. | 2,151,330 | March 18, 2026 | US-WA | Regulator |
| Insightin Health, Inc. | 1,949,534 | January 16, 2026 | US-MD | Regulator |
| Anne Arundel Dermatology | 1,905,000 | July 11, 2025 | US-MD | Regulator |
| Summit Pathology and Summit Pathology Laboratories, Inc. | 1,813,538 | October 18, 2024 | US-CO | Regulator |
| New York City Health and Hospitals Corporation | 1,800,000 | March 24, 2026 | US-NY | Regulator |
| Insightin Health, Inc. | 1,777,141 | March 10, 2026 | US-TX | Regulator |
| Kettering Adventist Healthcare | 1,695,382 | July 21, 2025 | US-OH | Court |
| CenterPoint Energy, Inc. | 1,611,625 | October 13, 2026 | US-TX | Court |
| Strategic Education Inc. | 1,513,518 | June 1, 2026 | US-WA | Regulator |
| The Phia Group | 1,512,742 | January 30, 2026 | US-WA | Regulator |
| Allianz Life Insurance Company of North America | 1,497,036 | July 25, 2025 | US-WA | Regulator |
| Radiology Associates of Richmond, Inc. | 1,419,091 | July 1, 2025 | US-VA | Regulator |
| Kaplan North America, LLC | 1,403,060 | March 17, 2026 | US-WA | Regulator |
| Xsolis, Inc. | 1,396,519 | June 5, 2026 | US-TN | Regulator |
| Everside Health | 1,389,758 | July 31, 2026 | US-WA | Regulator |
| PIH Health, Inc. | 1,369,533 | March 3, 2026 | US-TX | Regulator |
| DermCare Management | 1,367,176 | April 10, 2026 | US-TX | Regulator |
| DermCare Management | 1,361,735 | May 2, 2025 | US-FL | Regulator |
| SimonMed Imaging | 1,275,669 | October 14, 2025 | US-TX | Regulator |
| MCBS, LLC | 1,261,464 | June 26, 2026 | US-GA | Regulator |
| Citizens Bank | 1,260,000 | October 19, 2026 | US-CA | Regulator |
| MCBS, LLC | 1,241,154 | June 26, 2026 | US-CA | Regulator |
| Absolute Dental Group, LLC | 1,223,635 | May 2, 2025 | US-NV | Regulator |
| WestJet | 1,200,000 | October 3, 2025 | US-WA | Regulator |
| Palomar Health | 1,140,221 | June 21, 2023 | US-CA | Regulator |
| Southeast Series of Lockton Companies, LLC (Lockton) | 1,124,727 | February 28, 2025 | US-GA | Regulator |
| Farmers Insurance Exchange, Farmers Group, Inc. (its attorney-in fact), and their subsidiaries and affiliates | 1,071,300 | December 9, 2025 | US-TX | Regulator |
| Community Health Center, Inc. | 1,060,936 | January 30, 2025 | US-CT | Regulator |
| Paradigm Healthcare Services | 970,403 | September 14, 2026 | US-CA | Regulator |
| Paradigm Healthcare Services | 970,000 | September 14, 2026 | US-CA | Regulator |
| Frederick Health | 934,326 | March 28, 2025 | US-MD | Regulator |
| Wilmer Cutler Pickering Hale and Dorr LLP | 911,658 | July 15, 2026 | US-WA | Regulator |
| ATSG, Inc | 909,469 | October 4, 2024 | US-NY | Regulator |
| Texas Tech University Health Sciences Center El Paso | 815,000 | November 25, 2024 | US-TX | Regulator |
| Texas Tech University Health Sciences Center | 813,892 | April 9, 2026 | US-WA | Regulator |
| Motility Software Solutions Inc | 766,670 | September 30, 2025 | US-WA | Regulator |
| McLaren Health Care | 743,131 | June 24, 2025 | US-MI | Court |
| OpenLoop Health, Inc. | 716,000 | March 17, 2026 | US-IA | Regulator |
| Medusind Inc. | 701,475 | January 7, 2025 | US-FL | Court |
| People's Community Clinic | 700,000 | December 19, 2025 | US-TX | Regulator |
| American First Finance LLC | 689,000 | September 12, 2025 | US-WA | Regulator |
| SitusAMC Holdings Corporation | 662,701 | February 20, 2026 | US-WA | Regulator |
| Texas Tech University Health Sciences Center | 650,000 | November 25, 2024 | US-TX | Regulator |
| Call-on-Doc | 648,535 | September 21, 2026 | US-TX | Regulator |
| Quantum Health, Inc. | 625,945 | August 18, 2026 | US-TX | Regulator |
| Washington Gastroenterology | 583,741 | August 22, 2025 | US-MA | Regulator |
| Erie Family Health Centers | 570,000 | March 27, 2026 | US-IL | Regulator |
| AssetMark, Inc. | 570,000 | June 11, 2026 | US-WA | Court |
| Kelly & Associates Insurance Group, Inc. | 553,332 | April 9, 2025 | US-MD | Regulator |
| BAYADA Home Health Care, Inc. | 550,164 | July 21, 2026 | US-TX | Regulator |
| Centers Lab NJ LLC | 542,377 | June 18, 2026 | US-NJ | Regulator |
| IMA Diligence Services, LLC | 525,306 | June 1, 2026 | US-TX | Court |
| AssuranceAmerica Managing General Agency, LLC | 489,825 | October 16, 2026 | US-TX | Regulator |
| Covenant Health, Inc. | 478,188 | January 5, 2026 | US-TX | Regulator |
| Goshen Medical Center | 456,385 | September 18, 2025 | US-TX | Court |
| Allied Health MSO Holdco, LLC | 447,304 | August 25, 2026 | US-TX | Regulator |
| The University of Pennsylvania | 442,500 | December 1, 2025 | US-WA | Regulator |