| 2026-02-26 | Company | Registered Alternate name |
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| 2026-02-26 | 100% Quest Diagnostics Holdings Incorporated (DE) | |
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| 2026-02-26 | 100% Quest Diagnostics International Holdings Limited (UK) | |
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| 2026-02-26 | 100% Quest Diagnostics Holdings Ltd. (UK) | |
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| 2026-02-26 | 100% ExamOne Canada, Inc. (New Brunswick, Canada) | |
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| 2026-02-26 | 100% Quest Diagnostics of Puerto Rico, Inc. | Puerto Rico |
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| 2026-02-26 | 100% Quest Diagnostics Ireland Limited | Ireland |
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| 2026-02-26 | 100% Quest Diagnostics (Shanghai) Co., Ltd. | China |
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| 2026-02-26 | 100% Quest Diagnostics Clinical Laboratories, Inc. (DE) | Advanced Toxicology Network Quest Diagnostics |
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| 2026-02-26 | 100% Quest Consumer Inc. (DE) | |
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| 2026-02-26 | 100% Quest Procurement LLC (DE) | |
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| 2026-02-26 | 100% LabOne, LLC (MO) | Quest Diagnostics LabOne, LLC of Kansas |
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| 2026-02-26 | 100% ExamOne World Wide, Inc. (PA) | |
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| 2026-02-26 | 100% ExamOne LLC (DE) | |
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| 2026-02-26 | 100% ExamOne World Wide of NJ, Inc. (NJ) | |
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| 2026-02-26 | 100% DGXWMT JV, LLC (DE) | |
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| 2026-02-26 | 100% PACK Health, LLC (AL) | |
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| 2026-02-26 | 100% Quest HealthConnect, LLC (CA) | |
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| 2026-02-26 | 100% Quest Diagnostics Health & Wellness, LLC (DE) | |
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| 2026-02-26 | 100% LabOne of Ohio, Inc. (DE) | Quest Diagnostics |
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| 2026-02-26 | 51% Diagnostic Laboratory of Oklahoma LLC (OK) | |
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| 2026-02-26 | 49% Sonora Quest Laboratories LLC (AZ) | |
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| 2026-02-26 | 100% Quest Diagnostics do Brasil Ltda. | Brazil |
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| 2026-02-26 | 100% Quest Diagnostics Incorporated (MD) | |
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| 2026-02-26 | 100% Quest Diagnostics India Private Limited | India |
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| 2026-02-26 | 100% Quest Diagnostics International LLC (DE) | |
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| 2026-02-26 | 100% Quest Diagnostics Investments LLC (DE) | |
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| 2026-02-26 | 100% Quest Diagnostics LLC (IL) | Quest Diagnostics LLC |
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| 2026-02-26 | 100% Quest Diagnostics LLC (MA) | Quest Diagnostics LLC Quest Diagnostics of Connecticut LLC |
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| 2026-02-26 | 81.1% Quest Diagnostics Massachusetts LLC (MA) | |
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| 2026-02-26 | 100% Quest Diagnostics LLC (CT) | |
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| 2026-02-26 | 99.9% Quest Diagnostics Mexico, S de RL de CV (Mexico) (0.1% Quest Diagnostics Holdings Incorporated (DE)) | |
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| 2026-02-26 | 100% Quest Diagnostics Nichols Institute (CA) | Quest Diagnostics Nichols Institute (CA) Inc. Quest Diagnostics Nichols Institute Inc. |
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| 2026-02-26 | 100% Quest Diagnostics of Pennsylvania Inc. (DE) | |
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| 2026-02-26 | 51% Quest Diagnostics Venture LLC (PA) | |
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| 2026-02-26 | 53.5% Associated Clinical Laboratories of Pennsylvania, L.L.C. (PA) | |
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| 2026-02-26 | 1% Associated Clinical Laboratories, L.P. (PA) | |
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| 2026-02-26 | 52.97% Associated Clinical Laboratories, L.P. (PA) | |
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| 2026-02-26 | 100% Quest Diagnostics Receivables Inc. (DE) | |
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| 2026-02-26 | 100% Quest Diagnostics TB, LLC (DE) | |
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| 2026-02-26 | 100% CML Healthcare Inc. (Ontario, Canada) | M-Health Solutions |
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| 2026-02-26 | 100% LifeLabs GP ULC (Ontario, Canada) | |
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| 2026-02-26 | 99.995% LifeLabs BC LP (Ontario, Canada) (0.005% LifeLabs GP ULC (Ontario, Canada)) | BC Biomedical Laboratories |
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| 2026-02-26 | 99.995% LifeLabs LP (Ontario, Canada) (0.005% LifeLabs GP ULC (Ontario, Canada)) | CML Bioanalytics Excelleris Technologies LifeLabs Lifelabs Bioanalytical Laboratory Services LifeLabs Genetics LifeLabs Medical Laboratory Services Rocky Mountain Analytical |
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| 2026-02-26 | 100% American Medical Laboratories, Incorporated (DE) | |
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| 2026-02-26 | 100% Quest Diagnostics Nichols Institute, Inc. (VA) | Quest Diagnostics Quest Diagnostics Nichols Institute, Institute, Inc. of Virginia |
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| 2026-02-26 | 100% Quest Diagnostics Incorporated (NV) | Quest Diagnostics Incorporated of Nevada Quest Diagnostics |
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| 2026-02-26 | 100% Blueprint Genetics Inc. (DE) | Athena Diagnostics |
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| 2026-02-26 | 100% Blueprint Genetics Oy | Finland |
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| 2026-02-26 | 100% Blueprint Genetics FZ-LLC | UAE |
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| 2026-02-26 | 100% Cleveland HeartLab, Inc. (DE) | Cleveland Heartlab Services, Inc. |
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| 2026-02-26 | 100% Haystack Oncology, Inc. (DE) | |
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| 2026-02-26 | 100% Haystactack Oncology GmbH | Germany |
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| 2026-02-26 | 100% Isabella Street Urban Renewal, LLC (NJ) | |
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| 2026-02-26 | 100% Med Fusion, LLC (TX) | |
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| 2026-02-26 | 100% Reprosource Fertility Diagnostics, Inc. (MA) | |
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| 2026-02-26 | 100% Unilab Corporation (DE) | Quest Diagnostics |
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| 2026-02-26 | 100% AmeriPath, Inc. (DE) | |
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| 2026-02-26 | 100% AmeriPath Cincinnati, Inc. (OH) | Dermpath Diagnostics Richfield Laboratory of Dermatopathology |
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| 2026-02-26 | 100% AmeriPath Cleveland, Inc. (OH) | |
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| 2026-02-26 | 100% AmeriPath Consolidated Labs, Inc. (FL) | |
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| 2026-02-26 | 100% AmeriPath Florida, LLC (DE) | AmeriPath Central Florida AmeriPath South Florida Bay Area Dermatopathology Dermpath Diagnostics Dermpath Diagnostics Bay Area Dermpath Diagnostics South Florida Institute for Immunofluorescence Institute for Podiatric Pathology |
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| 2026-02-26 | 100% AmeriPath Hospital Services Florida, LLC (DE) | |
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| 2026-02-26 | 100% AmeriPath Kentucky, Inc. (KY) | |
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| 2026-02-26 | 100% AmeriPath Lubbock 5.01(A) Corporation (TX) | Arlington Pathology Associates Dermpath Diagnostics Texas North Arlington Pathology Associates Pathology Associates of Texas |
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| 2026-02-26 | 100% AmeriPath New York, LLC (DE) | AmeriPath East AmeriPath Gastrointestinal Diagnostics AmeriPath Northeast Dermpath Diagnostics Ackerman Academy of Dermatopathology Dermpath Diagnostics New York |
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| 2026-02-26 | 100% AmeriPath Texas Inc. (DE) | |
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| 2026-02-26 | 100% AmeriPath Tucson, Inc. (AZ) | AmeriPath Arizona Dermpath Diagnostics |
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| 2026-02-26 | 100% Consolidated DermPath, Inc. (DE) | |
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| 2026-02-26 | 100% DFW 5.01(a) Corporation (TX) | AmeriPath North Texas |
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| 2026-02-26 | 100% Diagnostic Pathology Services, Inc. (OK) | AmeriPath Oklahoma |
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| 2026-02-26 | 100% Kailash B. Sharma, M.D., Inc. (GA) | |
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| 2026-02-26 | 100% Nuclear Medicine and Pathology Associates (GA) | |
|---|
| 2026-02-26 | 100% Institute for Dermatopathology, Inc. (PA) | AmeriPath Mid Atlantic Dermpath Diagnostics The Dermatopathology Laboratory |
|---|
| 2026-02-26 | 100% Ocmulgee Medical Pathology Association, Inc. (GA) | AmeriPath Georgia Gastrointestinal Diagnostics Dermpath Diagnostics |
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| 2026-02-26 | 100% Specialty Laboratories, Inc. (CA) | Quest Diagnostics Nichols Institute of Valencia, Inc. |
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| 2026-02-26 | Additional Entities Consolidated for Accounting Purposes | |
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| 2026-02-26 | AmeriPath Indianapolis, PC (IN) | AmeriPath Indianapolis, PSC AmeriPath Indianapolis Medical Pathology Dermpath Diagnostics |
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| 2026-02-26 | Colorado Pathology Consultants, P.C. (CO) | AmeriPath Colorado Dermpath Diagnostics |
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| 2026-02-26 | Dermatopathology of Wisconsin, S.C. (WI) | AmeriPath Great Lakes Dermpath Diagnostics |
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| 2026-02-26 | Hoffman, M.D., Associated Pathologists, Chartered (NV) | Associated Pathologists, Chartered APC at Liberation Drive |
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| 2026-02-26 | Kilpatrick Pathology, P.A. (NC) | |
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| 2026-02-26 | PhenoPath Laboratories, PLLC (WA) | PhenoPath Laboratories, LLC |
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