Top 100 Contractors in PSC 6550: In Vitro Diagnostic Substances, Reagents, Test Kits and Sets, FY2025

Name: Top 100 Contractors in PSC 6550: In Vitro Diagnostic Substances, Reagents, Test Kits and Sets, FY2025
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

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

The top 10 won 50% of FY2025 PSC 6550 contract dollars

Contract obligations: $191,209,259 Net of deobligations, by contracts coded PSC 6550
Contractors: 211 Parent companies with an obligation
Largest contractor: Danaher Corporation $44.6 million, 16.6% of obligations
Data as of: Oct 23, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Danaher Corporation 10 awardees, including Cepheid, Beckman Coulter, Inc. and Beckman Coulter Gesellschaft MIT Beschraenkter Haftung Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$44,636,596	16.6%	Rank history: #3 in FY2021, #5 in FY2022, #6 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	Roche Holdings Inc. Through Roche Diagnostics Corporation Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Army (Department of the Army)	$18,521,119	6.9%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; up 20 since FY2024.
3	Biofire Defense LLC 5 awardees, including Biomerieux Inc. and Biomerieux Deutschland GMBH Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) Navy (Department of the Navy)	$17,246,668	6.4%	Rank history: #70 in FY2021, not on the FY2022–FY2023 lists and #5 in FY2024; up 2 since FY2024.
4	Abbott Laboratories Inc. 6 awardees, including Abbott Molecular Inc. and Alere San Diego, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Army (Department of the Army)	$15,550,663	5.8%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2023 and #7 in FY2024; up 3 since FY2024.
5	Ortho-Clinical Diagnostics Inc. 5 awardees, including Quidel Corp Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$8,090,628	3.0%	Rank history: #4 in FY2021, #55 in FY2022, not on the FY2023 list and #17 in FY2024; up 12 since FY2024.
6	Sysmex America Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$6,765,118	2.5%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2024; up 6 since FY2024.
7	Illumina, Inc. Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency) USDA (Department of Agriculture)	$6,223,045	2.3%	Rank history: #15 in FY2021, #16 in FY2022, #15 in FY2023 and #11 in FY2024; up 4 since FY2024.
8	Siemens Corporation Through Siemens Healthcare Diagnostics Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$6,170,932	2.3%	Rank history: not on the FY2021–FY2023 lists and #19 in FY2024; up 11 since FY2024.
9	10X Genomics, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$5,498,025	2.0%	Rank history: #37 in FY2021, #27 in FY2022, #21 in FY2023 and #31 in FY2024; up 22 since FY2024.
10	Biomerieux Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$5,059,373	1.9%	Rank history: #70 in FY2021, not on the FY2022–FY2023 lists and #5 in FY2024; down 5 since FY2024.
11	Thermo Fisher Scientific Inc. 7 awardees, including Fisher Scientific Company L.L.C., Microgenics Corporation and Life Technologies Corporation Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) DHA (Defense Health Agency)	$4,714,499	1.8%	Rank history: not on the FY2021–FY2022 lists, #48 in FY2023 and #10 in FY2024; down 1 since FY2024.
12	Hologic, Inc. 2 awardees, including Hologic Sales and Service, LLC Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$4,665,849	1.7%	Rank history: #12 in FY2021, #11 in FY2022, #12 in FY2023 and #9 in FY2024; down 3 since FY2024.
13	Government Scientific Source Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Army (Department of the Army)	$4,488,264	1.7%	Rank history: #13 in FY2021, #13 in FY2022, #14 in FY2023 and #13 in FY2024; unchanged since FY2024.
14	Werfen USA LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$3,166,946	1.2%	Rank history: #16 in FY2021, #18 in FY2022, #24 in FY2023 and #18 in FY2024; up 4 since FY2024.
15	Abbott Molecular Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$3,075,955	1.1%	Rank history: not on the FY2021–FY2024 lists; new.
16	Polymedco LLC 2 awardees, including Polymedco Cancer Diagnostic Products LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$2,849,014	1.1%	Rank history: #40 in FY2021, #52 in FY2022, #36 in FY2023 and #34 in FY2024; up 18 since FY2024.
17	Greer Laboratories, Inc. Top agencies DHA (Defense Health Agency)	$2,378,823	0.9%	Rank history: not on the FY2021–FY2023 lists and #60 in FY2024; up 43 since FY2024.
18	Diasorin S.P.A. 3 awardees, including Diasorin Inc., Luminex Corp and Diasorin Molecular, LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USDA (Department of Agriculture)	$2,224,126	0.8%	Rank history: not on the FY2021–FY2024 lists; up 85 since FY2024.
19	Standard Biotools Inc. Through Somalogic Operating Co., Inc. Top agencies HHS (Department of Health and Human Services)	$2,069,424	0.8%	Rank history: not on the FY2021–FY2024 lists; new.
20	Qiagen, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$1,543,413	0.6%	Rank history: #26 in FY2021, #47 in FY2022, #39 in FY2023 and #30 in FY2024; up 10 since FY2024.
21	Mariano Prime LLC Top agencies DHA (Defense Health Agency)	$1,541,391	0.6%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2024; up 2 since FY2024.
22	Immucor Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) Army (Department of the Army)	$1,525,085	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
23	Sebia, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$1,332,094	0.5%	Rank history: #36 in FY2021, #39 in FY2022, #31 in FY2023 and #43 in FY2024; up 20 since FY2024.
24	Diagnostica Stago Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$1,257,469	0.5%	Rank history: not on the FY2021–FY2024 lists; up 117 since FY2024.
25	Oneblood, Inc. Top agencies VA (Department of Veterans Affairs)	$1,063,700	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
26	Smiths Detection Inc. Top agencies DOD (Department of Defense)	$1,008,866	0.4%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; up 10 since FY2024.
27	Thermo Electron Corporation 4 awardees, including Fisher Scientific Company L.L.C., The Binding Site. Inc. and Olink Proteomics Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) Navy (Department of the Navy)	$924,695	0.3%	Rank history: #8 in FY2021, #9 in FY2022, #10 in FY2023 and #27 in FY2024; unchanged since FY2024.
28	Ortho Clinical Diagnostics K.K. Top agencies DHA (Defense Health Agency)	$901,083	0.3%	Rank history: #24 in FY2021, #28 in FY2022, #37 in FY2023 and #42 in FY2024; up 14 since FY2024.
29	Branch Medical LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Navy (Department of the Navy)	$891,615	0.3%	Rank history: #23 in FY2021, #20 in FY2022, #51 in FY2023 and #35 in FY2024; up 6 since FY2024.
30	Franklin Young International, Incorporated Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$843,116	0.3%	Rank history: #45 in FY2021, #53 in FY2022, #72 in FY2023 and #49 in FY2024; up 19 since FY2024.
31	Bio-Rad Laboratories, Inc. 3 awardees Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DHA (Defense Health Agency)	$842,036	0.3%	Rank history: #30 in FY2021, #29 in FY2022, #34 in FY2023 and #26 in FY2024; down 5 since FY2024.
32	Grifols Diagnostic Solutions Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$739,425	0.3%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2024; up 37 since FY2024.
33	Lantheus Holdings, Inc. Through Progenics Pharmaceuticals Inc. Top agencies VA (Department of Veterans Affairs)	$696,483	0.3%	Rank history: #89 in FY2021, not on the FY2022 list, #75 in FY2023 and #29 in FY2024; down 4 since FY2024.
34	Agilent Technologies, Inc. 2 awardees Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$636,794	0.2%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2024; up 17 since FY2024.
35	The American National Red Cross Top agencies DHA (Defense Health Agency)	$615,000	0.2%	Rank history: #34 in FY2021, #37 in FY2022, #30 in FY2023 and #62 in FY2024; up 27 since FY2024.
36	Qualtex Laboratories Top agencies DHA (Defense Health Agency)	$604,080	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
37	Medpharm Inc. Top agencies DHA (Defense Health Agency)	$601,314	0.2%	Rank history: #80 in FY2021, #85 in FY2022 and not on the FY2023–FY2024 lists; returned.
38	Charm Sciences Inc. Top agencies USDA (Department of Agriculture) DLA (Defense Logistics Agency)	$598,876	0.2%	Rank history: #33 in FY2021, #42 in FY2022, #49 in FY2023 and #45 in FY2024; up 7 since FY2024.
39	Murtech, Inc. Top agencies Army (Department of the Army)	$584,819	0.2%	Rank history: #18 in FY2021, #22 in FY2022, #26 in FY2023 and #55 in FY2024; up 16 since FY2024.
40	Summit Shoji Inc. Top agencies DLA (Defense Logistics Agency)	$485,529	0.2%	Rank history: not on the FY2021 list, #61 in FY2022, #45 in FY2023 and #40 in FY2024; unchanged since FY2024.
41	Henry Schein, Inc. 2 awardees Top agencies DHA (Defense Health Agency)	$458,089	0.2%	Rank history: #41 in FY2021, #50 in FY2022, #55 in FY2023 and #57 in FY2024; up 16 since FY2024.
42	Cardinal Health 200, LLC Top agencies VA (Department of Veterans Affairs)	$433,686	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
43	SZY Holdings, LLC Top agencies DLA (Defense Logistics Agency)	$420,069	0.2%	Rank history: #35 in FY2021, #46 in FY2022, #59 in FY2023 and #52 in FY2024; up 9 since FY2024.
44	Phadia US Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$395,047	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
45	Clear Labs Inc. Top agencies VA (Department of Veterans Affairs)	$383,001	0.1%	Rank history: #71 in FY2021, #38 in FY2022, #70 in FY2023 and #59 in FY2024; up 14 since FY2024.
46	RLS (USA) Inc. Top agencies VA (Department of Veterans Affairs)	$378,282	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
47	McKesson Corporation 2 awardees, including Mckesson Medical-Surgical Inc. and Mckesson Medical-Surgical Government Solutions LLC Top agencies HHS (Department of Health and Human Services) DLA (Defense Logistics Agency)	$359,674	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
48	Jubilant Draximage Radiopharmacies, Inc. Top agencies VA (Department of Veterans Affairs)	$357,316	0.1%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and not on the FY2024 list; returned.
49	Quidelortho Sales Company, LLC Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$335,175	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
50	Advanced Instruments LLC Through Nova Biomedical Corp Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$327,107	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
51	Ahlstrom USA Inc. Top agencies DHA (Defense Health Agency)	$324,160	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
52	Alamar Biosciences, Inc. Top agencies HHS (Department of Health and Human Services)	$324,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
53	Vmrd Inc. Top agencies USDA (Department of Agriculture)	$320,709	0.1%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2024; up 24 since FY2024.
54	The Blood Center Top agencies VA (Department of Veterans Affairs)	$299,670	0.1%	Rank history: #44 in FY2021, #43 in FY2022, #65 in FY2023 and #72 in FY2024; up 18 since FY2024.
55	Caredx, Inc. Through Caredx Lab Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$279,096	0.1%	Rank history: #83 in FY2021, not on the FY2022 list, #27 in FY2023 and #38 in FY2024; down 17 since FY2024.
56	Cardinal Health, Inc. Through Cardinal Health 414, LLC Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$265,514	0.1%	Rank history: not on the FY2021–FY2024 lists; up 51 since FY2024.
57	Zeus Scientific, LLC Top agencies VA (Department of Veterans Affairs)	$245,406	0.1%	Rank history: #91 in FY2021, #98 in FY2022, not on the FY2023 list and #68 in FY2024; up 11 since FY2024.
58	Oxford Nanopore Technologies, Inc. Top agencies HHS (Department of Health and Human Services)	$243,392	0.1%	Rank history: not on the FY2021–FY2024 lists; up 50 since FY2024.
59	Orasure Technologies Inc. Top agencies HHS (Department of Health and Human Services)	$238,459	0.1%	Rank history: not on the FY2021 list, #10 in FY2022, #8 in FY2023 and #84 in FY2024; up 25 since FY2024.
60	Cerus Corporation Top agencies DHA (Defense Health Agency)	$238,240	0.1%	Rank history: not on the FY2021 list, #81 in FY2022, #81 in FY2023 and #94 in FY2024; up 34 since FY2024.
61	Cambridge Isotope Laboratories Inc. Top agencies HHS (Department of Health and Human Services)	$233,095	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
62	Instrumentation Laboratory Japan Co., Ltd. Top agencies DHA (Defense Health Agency) DLA (Defense Logistics Agency)	$224,380	0.1%	Rank history: not on the FY2021–FY2024 lists; up 111 since FY2024.
63	Veterans Healthcare Supply Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$217,434	0.1%	Rank history: not on the FY2021 list, #45 in FY2022 and not on the FY2023–FY2024 lists; returned.
64	Lifeshare Blood Center Top agencies VA (Department of Veterans Affairs)	$203,856	0.1%	Rank history: #51 in FY2021, #65 in FY2022, #64 in FY2023 and #71 in FY2024; up 7 since FY2024.
65	Meta Systems Group Inc. Top agencies VA (Department of Veterans Affairs)	$198,900	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
66	J & N Marketing, Inc. Top agencies HHS (Department of Health and Human Services)	$198,301	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
67	The Trustees of Columbia University In the City of New York Top agencies Navy (Department of the Navy)	$190,084	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
68	Alba Bioscience, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$185,398	0.1%	Rank history: #64 in FY2021, #82 in FY2022, #71 in FY2023 and #80 in FY2024; up 12 since FY2024.
69	Meditrade Medical Trading GMBH Top agencies DHA (Defense Health Agency)	$180,394	0.1%	Rank history: not on the FY2021–FY2022 lists, #33 in FY2023 and not on the FY2024 list; returned.
70	Mapp Biopharmaceutical, Inc. Top agencies DHA (Defense Health Agency)	$171,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
71	State of Alaska Department of Health Top agencies DHA (Defense Health Agency)	$160,020	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
72	Abcam Inc. Top agencies HHS (Department of Health and Human Services)	$151,254	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
73	Trilink Biotechnologies, LLC Top agencies EPA (Environmental Protection Agency)	$150,000	0.1%	Rank history: not on the FY2021–FY2024 lists; up 137 since FY2024.
74	Promega Corporation Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$149,969	0.1%	Rank history: not on the FY2021 list, #71 in FY2022, #60 in FY2023 and #79 in FY2024; up 5 since FY2024.
75	Ultima Genomics, Inc. Top agencies HHS (Department of Health and Human Services)	$146,500	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	STG Korea Inc. Top agencies DHA (Defense Health Agency)	$141,879	0.1%	Rank history: not on the FY2021–FY2024 lists; up 142 since FY2024.
77	Communications Professionals Inc. Top agencies USDA (Department of Agriculture)	$138,104	0.1%	Rank history: #93 in FY2021, not on the FY2022 list, #96 in FY2023 and not on the FY2024 list; up 24 since FY2024.
78	Bighorn Ridgerunners, LLC Top agencies HHS (Department of Health and Human Services)	$138,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
79	Bio-Techne Sales Corporation Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$135,692	0.1%	Rank history: not on the FY2021–FY2024 lists; up 110 since FY2024.
80	Therakos LLC Top agencies HHS (Department of Health and Human Services)	$135,315	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
81	University of California, San Diego Top agencies Navy (Department of the Navy)	$135,072	0.1%	Rank history: not on the FY2021–FY2024 lists; up 32 since FY2024.
82	SL Meditech Co. Top agencies DHA (Defense Health Agency)	$134,160	<0.1%	Rank history: not on the FY2021–FY2023 lists and #96 in FY2024; up 14 since FY2024.
83	Oakridge Dynamics LLC Top agencies DLA (Defense Logistics Agency)	$131,205	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 32 since FY2024.
84	Vitalant 2 awardees, including Lifestream Blood Bank Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$129,457	<0.1%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 16 since FY2024.
85	Quanterix Corporation 2 awardees, including Akoya Biosciences, Inc. Top agencies VA (Department of Veterans Affairs)	$128,895	<0.1%	Rank history: #50 in FY2021 and not on the FY2022–FY2024 lists; returned.
86	Ortho-Clinical Diagnostics Singapore Pte. Ltd. Korea Branch Top agencies DHA (Defense Health Agency)	$128,029	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
87	Helena Laboratories Corporation Top agencies VA (Department of Veterans Affairs)	$125,646	<0.1%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2024; down 1 since FY2024.
88	Invetech US LLC Top agencies HHS (Department of Health and Human Services)	$124,000	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
89	Streck LLC Top agencies VA (Department of Veterans Affairs)	$106,888	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
90	GEN-Probe Incorporated Top agencies DHA (Defense Health Agency)	$106,500	<0.1%	Rank history: not on the FY2021 list, #41 in FY2022, #20 in FY2023 and #33 in FY2024; down 57 since FY2024.
91	POC Korea Ltd. Top agencies DHA (Defense Health Agency)	$103,728	<0.1%	Rank history: #85 in FY2021, #92 in FY2022, #68 in FY2023 and not on the FY2024 list; up 28 since FY2024.
92	Gulf Corporation for Technology W.l.l Top agencies Navy (Department of the Navy)	$102,749	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
93	Nikon Metrology Inc Through Nikon Instruments Inc. Top agencies VA (Department of Veterans Affairs)	$100,580	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
94	Alfresa Corporation Top agencies DLA (Defense Logistics Agency)	$98,941	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 22 since FY2024.
95	Metro Medical Equipment & Supply, Inc. Top agencies DHA (Defense Health Agency)	$97,772	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 97 since FY2024.
96	Biopool U.s., Inc. Top agencies VA (Department of Veterans Affairs)	$96,865	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 9 since FY2024.
97	Bioanalytical Instruments Inc. Top agencies HHS (Department of Health and Human Services)	$89,057	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
98	Cenmed Enterprises Inc. Top agencies DLA (Defense Logistics Agency)	$87,731	<0.1%	Rank history: not on the FY2021 list, #76 in FY2022, not on the FY2023 list and #98 in FY2024; unchanged since FY2024.
99	Immuno Mycologies Inc. Top agencies VA (Department of Veterans Affairs)	$86,077	<0.1%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2024; down 34 since FY2024.
100	Meridian Bioscience Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$84,008	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 82 since FY2024.

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100 of 211 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 $269 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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 PSC 6550 contractors in FY2025?

1. Danaher Corporation ($44.6M), 2. Roche Holdings Inc. ($18.5M), 3. Biofire Defense LLC ($17.2M), 4. Abbott Laboratories Inc. ($15.6M), 5. Ortho-Clinical Diagnostics Inc. ($8.09M), 6. Sysmex America Inc. ($6.77M), 7. Illumina, Inc. ($6.22M), 8. Siemens Corporation ($6.17M), 9. 10X Genomics, Inc. ($5.5M), 10. Biomerieux Inc. ($5.06M).

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