Top 100 Contractors in NAICS 621511: Medical Laboratories, FY2025

Name: Top 100 Contractors in NAICS 621511: Medical Laboratories, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 63% of FY2025 NAICS 621511 contract dollars

Contract obligations: $475,378,396 Net of deobligations, by contracts coded NAICS 621511
Contractors: 392 Parent companies with an obligation
Largest contractor: Laboratory Corporation of America $142 million, 24.5% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Laboratory Corporation of America 7 awardees, including Center for Disease Detection, LLC and Medtox Laboratories Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Army (Department of the Army)	$141,928,303	24.5%	Rank history: #14 in FY2021, #8 in FY2022, #2 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	Quest Diagnostics Incorporated 5 awardees, including Ameripath Inc. and Quest Diagnostics of Puerto Rico Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DHA (Defense Health Agency)	$99,278,588	17.1%	Rank history: #5 in FY2021, #4 in FY2022, #1 in FY2023 and #2 in FY2024; unchanged since FY2024.
3	Roche Holdings Inc. 2 awardees, including Foundation Medicine, Inc. and Roche Diagnostics Corporation Top agencies VA (Department of Veterans Affairs)	$47,975,879	8.3%	Rank history: not on the FY2021–FY2024 lists; new.
4	SNA International LLC Top agencies WHS (DOD Washington Headquarters Service)	$17,830,866	3.1%	Rank history: not on the FY2021 list, #11 in FY2022, #6 in FY2023 and #4 in FY2024; unchanged since FY2024.
5	The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. Top agencies DHA (Defense Health Agency)	$12,003,842	2.1%	Rank history: #24 in FY2021, #15 in FY2022, #8 in FY2023 and #8 in FY2024; up 3 since FY2024.
6	Baylor Miraca Genetics Laboratories LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$11,645,670	2.0%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2024; up 31 since FY2024.
7	Family Health International Top agencies USAID (US Agency for International Development)	$9,456,610	1.6%	Rank history: not on the FY2021–FY2023 lists and #16 in FY2024; up 9 since FY2024.
8	College of American Pathologists Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$9,208,194	1.6%	Rank history: not on the FY2021–FY2024 lists; up 108 since FY2024.
9	Fulgent Genetics, Inc. 2 awardees, including Fulgent Therapeutics LLC Top agencies VA (Department of Veterans Affairs)	$7,414,652	1.3%	Rank history: #10 in FY2021, #19 in FY2022, #26 in FY2023 and #9 in FY2024; unchanged since FY2024.
10	Arup Laboratories Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Army (Department of the Army)	$7,172,650	1.2%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; up 5 since FY2024.
11	Mayo Collaborative Services, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$6,896,510	1.2%	Rank history: #69 in FY2021, not on the FY2022–FY2023 lists and #12 in FY2024; up 1 since FY2024.
12	Tempus AI, Inc. Top agencies VA (Department of Veterans Affairs)	$5,718,045	1.0%	Rank history: not on the FY2021 list, #21 in FY2022, #30 in FY2023 and #6 in FY2024; down 6 since FY2024.
13	Northern Plains Laboratory LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$4,619,960	0.8%	Rank history: #33 in FY2021, #25 in FY2022, #15 in FY2023 and #14 in FY2024; up 1 since FY2024.
14	Sonora Quest Laboratories LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$4,484,426	0.8%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2024; down 3 since FY2024.
15	Caredx, Inc. Top agencies VA (Department of Veterans Affairs)	$4,153,184	0.7%	Rank history: not on the FY2021 list, #40 in FY2022, #24 in FY2023 and #52 in FY2024; up 37 since FY2024.
16	Abbott Laboratories Inc. 6 awardees, including Pembrooke Occupational Health, Inc., Alere Toxicology Services, Inc. and Redwood Toxicology Laboratory, Inc. Top agencies OSD (Office of the Secretary of Defense) DOT (Department of Transportation) VA (Department of Veterans Affairs)	$3,929,359	0.7%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; down 9 since FY2024.
17	Creative Testing Solutions Top agencies DHA (Defense Health Agency)	$3,574,913	0.6%	Rank history: #46 in FY2021, #23 in FY2022, #34 in FY2023 and #22 in FY2024; up 5 since FY2024.
18	Oregon Health & Science University Top agencies VA (Department of Veterans Affairs)	$3,081,030	0.5%	Rank history: #30 in FY2021, #44 in FY2022, #25 in FY2023 and #20 in FY2024; up 2 since FY2024.
19	Labcorp Oklahoma Inc. Top agencies HHS (Department of Health and Human Services)	$2,903,000	0.5%	Rank history: not on the FY2021–FY2022 lists, #28 in FY2023 and #28 in FY2024; up 9 since FY2024.
20	Tatitlek Federal Services LLC Top agencies Army (Department of the Army)	$2,851,300	0.5%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2024; down 3 since FY2024.
21	Cherokee Nation Operational Solutions, L.L.C. Top agencies HHS (Department of Health and Human Services)	$2,707,088	0.5%	Rank history: not on the FY2021–FY2022 lists, #23 in FY2023 and #18 in FY2024; down 3 since FY2024.
22	Vitalant Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$2,466,282	0.4%	Rank history: #62 in FY2021, #65 in FY2022, #61 in FY2023 and not on the FY2024 list; returned.
23	Exact Sciences Corporation 3 awardees, including Genomic Health, Inc. and Preventiongenetics LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$2,394,496	0.4%	Rank history: #20 in FY2021, #47 in FY2022, #20 in FY2023 and #21 in FY2024; down 2 since FY2024.
24	Neogenomics Inc. Through Neogenomics Laboratories, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$2,089,681	0.4%	Rank history: not on the FY2021–FY2023 lists and #19 in FY2024; down 5 since FY2024.
25	Deployed Resources LLC Top agencies HHS (Department of Health and Human Services)	$1,907,209	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
26	Bloodworks Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$1,836,215	0.3%	Rank history: #44 in FY2021, #64 in FY2022, #65 in FY2023 and #67 in FY2024; up 41 since FY2024.
27	University of Wisconsin Hospitals and Clinics Authority Top agencies VA (Department of Veterans Affairs)	$1,724,277	0.3%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 73 since FY2024.
28	Ginkgo Bioworks Holdings Inc. Through Ginkgo Bioworks, Inc. Top agencies HHS (Department of Health and Human Services)	$1,721,834	0.3%	Rank history: not on the FY2021–FY2023 lists and #24 in FY2024; down 4 since FY2024.
29	Prairie Band Health Services Inc. Top agencies HHS (Department of Health and Human Services)	$1,700,920	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
30	Commonspirit Health Through Commonspirit Oregon Top agencies VA (Department of Veterans Affairs)	$1,598,281	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
31	Mariano Prime LLC Top agencies DHA (Defense Health Agency)	$1,541,391	0.3%	Rank history: not on the FY2021–FY2023 lists and #26 in FY2024; down 5 since FY2024.
32	Veracyte, Inc. 2 awardees, including Veracyte Labs SD Corporation Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$1,526,706	0.3%	Rank history: not on the FY2021 list, #85 in FY2022, #49 in FY2023 and #46 in FY2024; up 14 since FY2024.
33	La Nigerienne D' Assurances Et De Reassurances NIA Top agencies DOS (Department of State)	$1,491,017	0.3%	Rank history: not on the FY2021–FY2024 lists; up 132 since FY2024.
34	University of Washington School of Medicine Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$1,479,578	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
35	Laboratory Corporation of America Holdings 2 awardees, including NWT Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$1,460,360	0.3%	Rank history: #4 in FY2021, #3 in FY2022, #4 in FY2023 and #51 in FY2024; up 16 since FY2024.
36	Avmedical LLC Top agencies VA (Department of Veterans Affairs)	$1,449,100	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
37	Upmc Presbyterian Shadyside Top agencies VA (Department of Veterans Affairs)	$1,419,465	0.2%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2024; down 5 since FY2024.
38	Cytopath Biopsy Lab Inc. Top agencies VA (Department of Veterans Affairs)	$1,393,165	0.2%	Rank history: not on the FY2021–FY2023 lists and #58 in FY2024; up 20 since FY2024.
39	Navitas Clinical Research Inc. Top agencies HHS (Department of Health and Human Services)	$1,388,618	0.2%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2024; down 6 since FY2024.
40	Danaher Corporation 2 awardees, including Cepheid and Beckman Coulter Gesellschaft MIT Beschraenkter Haftung Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$1,243,085	0.2%	Rank history: #35 in FY2021, #58 in FY2022, #29 in FY2023 and #35 in FY2024; down 5 since FY2024.
41	Physicians Laboratory, P.C. Top agencies VA (Department of Veterans Affairs)	$1,062,850	0.2%	Rank history: not on the FY2021 list, #42 in FY2022, #50 in FY2023 and #50 in FY2024; up 9 since FY2024.
42	Diagnostic Laboratory Services, Inc. Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$1,044,040	0.2%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2024; up 15 since FY2024.
43	California Department of Public Health Top agencies DHA (Defense Health Agency)	$1,038,696	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
44	Loyola University Health System Top agencies VA (Department of Veterans Affairs)	$1,037,000	0.2%	Rank history: not on the FY2021–FY2024 lists; up 77 since FY2024.
45	Genscript USA Inc. Top agencies HHS (Department of Health and Human Services)	$1,026,000	0.2%	Rank history: #56 in FY2021, #51 in FY2022, #47 in FY2023 and #42 in FY2024; down 3 since FY2024.
46	Iowa Pathology Associates, P.C. Top agencies VA (Department of Veterans Affairs)	$1,005,863	0.2%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and #82 in FY2024; up 36 since FY2024.
47	Vanderbilt University Medical Center Top agencies VA (Department of Veterans Affairs)	$998,749	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
48	South Central Pathology Lab Pa Top agencies VA (Department of Veterans Affairs)	$958,089	0.2%	Rank history: #87 in FY2021, #63 in FY2022, #76 in FY2023 and #70 in FY2024; up 22 since FY2024.
49	Cardionet LLC Top agencies VA (Department of Veterans Affairs)	$948,502	0.2%	Rank history: not on the FY2021–FY2023 lists and #40 in FY2024; down 9 since FY2024.
50	The University of Iowa Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$882,924	0.2%	Rank history: not on the FY2021–FY2022 lists, #72 in FY2023 and #44 in FY2024; down 6 since FY2024.
51	Stanford Health Care Top agencies VA (Department of Veterans Affairs)	$859,551	0.1%	Rank history: not on the FY2021–FY2024 lists; up 100 since FY2024.
52	One Stop Recruiting LLC Top agencies VA (Department of Veterans Affairs)	$848,028	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
53	Regents of the University of Michigan Top agencies VA (Department of Veterans Affairs)	$818,593	0.1%	Rank history: #70 in FY2021, #92 in FY2022, #53 in FY2023 and #43 in FY2024; down 10 since FY2024.
54	The University of Texas Southwestern Medical Center Top agencies VA (Department of Veterans Affairs)	$735,971	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
55	Sophia Genetics Inc. Top agencies DHA (Defense Health Agency)	$731,240	0.1%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023 and not on the FY2024 list; returned.
56	Biodesix, Inc. Top agencies VA (Department of Veterans Affairs)	$690,901	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
57	Regents of the University of Minnesota Top agencies HHS (Department of Health and Human Services)	$674,381	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
58	Nephropathology Associates, PLC Top agencies VA (Department of Veterans Affairs)	$635,621	0.1%	Rank history: not on the FY2021 list, #98 in FY2022, not on the FY2023 list and #99 in FY2024; up 41 since FY2024.
59	National Medical Services, Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$626,542	0.1%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2023 and #64 in FY2024; up 5 since FY2024.
60	Department of General Services Virginia Top agencies DHA (Defense Health Agency)	$607,200	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
61	Amprion, Inc. Top agencies HHS (Department of Health and Human Services)	$598,400	0.1%	Rank history: not on the FY2021–FY2022 lists, #42 in FY2023 and #72 in FY2024; up 11 since FY2024.
62	South Carolina State of Through Medical University Hospital Authority Top agencies VA (Department of Veterans Affairs)	$587,926	0.1%	Rank history: not on the FY2021 list, #73 in FY2022, not on the FY2023 list and #38 in FY2024; down 24 since FY2024.
63	Central TOX LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$586,349	0.1%	Rank history: not on the FY2021 list, #82 in FY2022, #64 in FY2023 and #62 in FY2024; down 1 since FY2024.
64	Psomagen Inc. Top agencies HHS (Department of Health and Human Services)	$585,703	0.1%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2024; down 39 since FY2024.
65	Incyte Pathology, P.S Top agencies VA (Department of Veterans Affairs)	$585,330	0.1%	Rank history: not on the FY2021 list, #53 in FY2022, #51 in FY2023 and #86 in FY2024; up 21 since FY2024.
66	Yale Univ Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy)	$581,708	0.1%	Rank history: not on the FY2021 list, #29 in FY2022, #83 in FY2023 and #81 in FY2024; up 15 since FY2024.
67	Brigham & Womens Hospital Inc Top agencies VA (Department of Veterans Affairs)	$565,245	0.1%	Rank history: #81 in FY2021, #69 in FY2022, #39 in FY2023 and #47 in FY2024; down 20 since FY2024.
68	Peninsula Histopathology Laboratory Inc. Top agencies VA (Department of Veterans Affairs)	$540,592	0.1%	Rank history: #86 in FY2021, #71 in FY2022, #48 in FY2023 and #71 in FY2024; up 3 since FY2024.
69	Medical University Hospital Authority Top agencies VA (Department of Veterans Affairs)	$518,369	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
70	Research Triangle Institute Top agencies HHS (Department of Health and Human Services)	$508,380	0.1%	Rank history: not on the FY2021 list, #30 in FY2022, #17 in FY2023 and #56 in FY2024; down 14 since FY2024.
71	Dhhs State Public Health Lab Top agencies DHA (Defense Health Agency)	$506,880	0.1%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2024; down 6 since FY2024.
72	Chesapeake Toxicology Resources, LLC Top agencies DOT (Department of Transportation)	$506,319	0.1%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and #73 in FY2024; up 1 since FY2024.
73	Mdxhealth Inc. Top agencies VA (Department of Veterans Affairs)	$494,260	0.1%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2023 and #61 in FY2024; down 12 since FY2024.
74	Chenega Tri-Services, LLC Top agencies DHA (Defense Health Agency)	$490,052	0.1%	Rank history: not on the FY2021–FY2023 lists and #74 in FY2024; unchanged since FY2024.
75	NNA Inc. Through Dialysis Clinic, Inc. Top agencies VA (Department of Veterans Affairs)	$477,990	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	Interpath Laboratory, Inc. Top agencies VA (Department of Veterans Affairs)	$476,970	0.1%	Rank history: not on the FY2021–FY2024 lists; up 33 since FY2024.
77	American Veteran Contracting Solutions LLC Top agencies VA (Department of Veterans Affairs)	$468,000	0.1%	Rank history: #82 in FY2021, #83 in FY2022, #79 in FY2023 and #75 in FY2024; down 2 since FY2024.
78	University of California, LOS Angeles Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$466,224	0.1%	Rank history: not on the FY2021–FY2023 lists and #63 in FY2024; down 15 since FY2024.
79	Fairbanks Memorial Hospital, LLC Top agencies DHA (Defense Health Agency)	$459,148	0.1%	Rank history: not on the FY2021–FY2023 lists and #92 in FY2024; up 13 since FY2024.
80	Indiana University Health, Inc. Top agencies VA (Department of Veterans Affairs)	$453,980	0.1%	Rank history: #95 in FY2021, #97 in FY2022, #91 in FY2023 and #77 in FY2024; down 3 since FY2024.
81	Aegis Toxicology Sciences Corporation Through Aegis Sciences Corporation Top agencies HHS (Department of Health and Human Services)	$448,446	0.1%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2024; down 42 since FY2024.
82	Eurofins Transplant Genomics, LLC Top agencies VA (Department of Veterans Affairs)	$440,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
83	PPD Development LP 2 awardees, including Fisher Scientific Company L.L.C. Top agencies HHS (Department of Health and Human Services)	$418,200	0.1%	Rank history: not on the FY2021–FY2024 lists; up 93 since FY2024.
84	Tricore, Inc. Top agencies HHS (Department of Health and Human Services)	$417,640	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
85	LHC Group, Inc. Through Healthcare Connections, Inc. Top agencies VA (Department of Veterans Affairs)	$404,739	0.1%	Rank history: not on the FY2021–FY2024 lists; up 46 since FY2024.
86	San Diego Pathologists Medical Group, Inc. Top agencies VA (Department of Veterans Affairs)	$395,833	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023 and #59 in FY2024; down 27 since FY2024.
87	Summit Pathology Top agencies VA (Department of Veterans Affairs)	$394,094	0.1%	Rank history: #98 in FY2021, not on the FY2022–FY2023 lists and #95 in FY2024; up 8 since FY2024.
88	Oregon Health Authority-Public Health Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$386,516	0.1%	Rank history: not on the FY2021–FY2023 lists and #88 in FY2024; unchanged since FY2024.
89	Appddictionstudio Limited Liability Company Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$375,371	0.1%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2024; down 66 since FY2024.
90	Bml, Inc. Top agencies DHA (Defense Health Agency)	$339,267	0.1%	Rank history: #31 in FY2021, #49 in FY2022 and not on the FY2023–FY2024 lists; returned.
91	Hennepin Healthcare System Inc. Top agencies VA (Department of Veterans Affairs)	$338,273	0.1%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2024; down 4 since FY2024.
92	All American Express Solutions LLC Top agencies VA (Department of Veterans Affairs)	$335,862	0.1%	Rank history: not on the FY2021–FY2023 lists and #89 in FY2024; down 3 since FY2024.
93	Bioscientia Institut FÜR Medizinische Diagnostik GMBH Top agencies DHA (Defense Health Agency)	$329,765	0.1%	Rank history: not on the FY2021–FY2024 lists; up 48 since FY2024.
94	The Pathology Group, P.C Top agencies VA (Department of Veterans Affairs)	$327,237	0.1%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2023 and #90 in FY2024; down 4 since FY2024.
95	The Association of University Physicians Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$299,158	0.1%	Rank history: not on the FY2021 list, #86 in FY2022, #90 in FY2023 and not on the FY2024 list; up 24 since FY2024.
96	BIO-Techne Corporation Through Exosome Diagnostics Inc. Top agencies VA (Department of Veterans Affairs)	$294,800	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
97	Sysmex America Inc. Top agencies DHA (Defense Health Agency)	$290,493	0.1%	Rank history: not on the FY2021–FY2024 lists; up 41 since FY2024.
98	University of Minnesota Physicians Top agencies VA (Department of Veterans Affairs)	$286,966	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 36 since FY2024.
99	Dentrust Dental International, Inc. Top agencies DHS (Department of Homeland Security)	$283,849	<0.1%	Rank history: not on the FY2021 list, #100 in FY2022, #86 in FY2023 and #84 in FY2024; down 15 since FY2024.
100	Goss Service Associates LLC Top agencies VA (Department of Veterans Affairs)	$280,492	<0.1%	Rank history: not on the FY2021 list, #96 in FY2022, #96 in FY2023 and not on the FY2024 list; up 2 since FY2024.

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100 of 392 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $580 million obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2025 ran Oct 1, 2024 – Sep 30, 2025. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2024. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2024 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 621511 contractors in FY2025?

1. Laboratory Corporation of America ($142M), 2. Quest Diagnostics Incorporated ($99.3M), 3. Roche Holdings Inc. ($48M), 4. SNA International LLC ($17.8M), 5. The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. ($12M), 6. Baylor Miraca Genetics Laboratories LLC ($11.6M), 7. Family Health International ($9.46M), 8. College of American Pathologists ($9.21M), 9. Fulgent Genetics, Inc. ($7.41M), 10. Arup Laboratories Inc. ($7.17M).

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