Top 100 Contractors in PSC AN: Health R&D Services, FY2025

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Leidos Holdings, Inc. 3 awardees, including Leidos Biomedical Research Inc. and Leidos, Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy) DHA (Defense Health Agency)	$629,195,220	14.1%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2023 and #3 in FY2024; up 2 since FY2024.
2	Medical Technology Enterprise Consortium Top agencies DHA (Defense Health Agency) Army (Department of the Army) Navy (Department of the Navy)	$214,368,069	4.8%	Rank history: #5 in FY2021, #4 in FY2022, #7 in FY2023 and #4 in FY2024; up 2 since FY2024.
3	Start2 Group, Inc. Top agencies HHS (Department of Health and Human Services)	$105,217,536	2.4%	Rank history: not on the FY2021–FY2023 lists and #27 in FY2024; up 24 since FY2024.
4	Emergent Biosolutions Inc. Through Emergent Product Development Gaithersburg Inc. Top agencies HHS (Department of Health and Human Services)	$96,674,751	2.2%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2024; up 2 since FY2024.
5	Amgen USA Inc Top agencies HHS (Department of Health and Human Services)	$89,932,937	2.0%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2024; up 4 since FY2024.
6	The Mitre Corporation Top agencies HHS (Department of Health and Human Services) FCC (Federal Communications Commission)	$88,088,875	2.0%	Rank history: #6 in FY2021, #7 in FY2022, #16 in FY2023 and #8 in FY2024; up 2 since FY2024.
7	Westat, Inc. 2 awardees Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$80,381,310	1.8%	Rank history: #8 in FY2021, #5 in FY2022, #19 in FY2023 and #12 in FY2024; up 5 since FY2024.
8	Mathematica Inc. Top agencies HHS (Department of Health and Human Services)	$77,897,663	1.7%	Rank history: #49 in FY2021, #30 in FY2022, #32 in FY2023 and #10 in FY2024; up 2 since FY2024.
9	Albert B. Sabin Vaccine Institute, Inc. (The) Top agencies HHS (Department of Health and Human Services)	$70,386,301	1.6%	Rank history: not on the FY2021–FY2023 lists and #43 in FY2024; up 34 since FY2024.
10	Technical Resources International, Inc. Top agencies HHS (Department of Health and Human Services)	$64,582,231	1.5%	Rank history: #9 in FY2021, #14 in FY2022, #3 in FY2023 and #15 in FY2024; up 5 since FY2024.
11	Basilea Pharmaceutica AG Through Basilea Pharmaceutica International Ltd, Allschwil Top agencies HHS (Department of Health and Human Services)	$63,700,481	1.4%	Rank history: not on the FY2021–FY2023 lists and #30 in FY2024; up 19 since FY2024.
12	Merck & Co. Inc. 2 awardees, including Cidara Therapeutics Inc. Top agencies HHS (Department of Health and Human Services)	$57,816,482	1.3%	Rank history: not on the FY2021–FY2024 lists; new.
13	Siga Technologies, Inc. Top agencies HHS (Department of Health and Human Services)	$53,123,168	1.2%	Rank history: #7 in FY2021, #32 in FY2022, #12 in FY2023 and #11 in FY2024; down 2 since FY2024.
14	Battelle Memorial Institute 2 awardees Top agencies HHS (Department of Health and Human Services)	$48,820,688	1.1%	Rank history: #26 in FY2021, #60 in FY2022, #54 in FY2023 and #33 in FY2024; up 19 since FY2024.
15	Trustees of Boston University 2 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$48,087,503	1.1%	Rank history: #76 in FY2021, #24 in FY2022, #20 in FY2023 and #29 in FY2024; up 14 since FY2024.
16	Hoffmann-La Roche Inc. Top agencies HHS (Department of Health and Human Services)	$47,500,709	1.1%	Rank history: not on the FY2021–FY2024 lists; new.
17	National Opinion Research Center Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$35,587,437	0.8%	Rank history: #20 in FY2021, #26 in FY2022, #33 in FY2023 and #20 in FY2024; up 3 since FY2024.
18	University of Illinois 2 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$33,119,052	0.7%	Rank history: not on the FY2021–FY2024 lists; new.
19	Duke University Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) Navy (Department of the Navy)	$30,666,934	0.7%	Rank history: #14 in FY2021, #13 in FY2022, #21 in FY2023 and #17 in FY2024; down 2 since FY2024.
20	Sanofi Pasteur Inc. Through Sanofi Vaccines US Inc. Top agencies HHS (Department of Health and Human Services)	$29,369,521	0.7%	Rank history: not on the FY2021–FY2023 lists and #47 in FY2024; up 27 since FY2024.
21	The Emmes Company, LLC Top agencies HHS (Department of Health and Human Services)	$28,284,948	0.6%	Rank history: #21 in FY2021, #21 in FY2022, #31 in FY2023 and #22 in FY2024; up 1 since FY2024.
22	Locus Biosciences Inc. Top agencies HHS (Department of Health and Human Services)	$28,257,626	0.6%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2024; up 13 since FY2024.
23	GE Medical Systems Information Technologies, Inc. Top agencies HHS (Department of Health and Human Services)	$26,920,376	0.6%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2023 and #67 in FY2024; up 44 since FY2024.
24	Kaleo, Inc. Top agencies HHS (Department of Health and Human Services)	$25,996,476	0.6%	Rank history: not on the FY2021–FY2024 lists; up 154 since FY2024.
25	Research Triangle Institute Top agencies HHS (Department of Health and Human Services)	$25,502,056	0.6%	Rank history: #100 in FY2021, #77 in FY2022, #73 in FY2023 and #23 in FY2024; down 2 since FY2024.
26	University of North Carolina At Chapel Hill Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$25,319,103	0.6%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2024; up 61 since FY2024.
27	Safetraces Inc Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$24,879,950	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
28	American Type Culture Collection Top agencies HHS (Department of Health and Human Services)	$24,466,219	0.5%	Rank history: not on the FY2021–FY2024 lists; up 249 since FY2024.
29	The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. Top agencies DHA (Defense Health Agency) USUHS (DOD Uniformed Services University of the Health Sciences) Army (Department of the Army)	$23,511,860	0.5%	Rank history: #15 in FY2021, #42 in FY2022, #57 in FY2023 and #25 in FY2024; down 4 since FY2024.
30	University of Pittsburgh - of the Commonwealth System of Higher Education Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$22,890,698	0.5%	Rank history: #39 in FY2021, #66 in FY2022, #34 in FY2023 and #51 in FY2024; up 21 since FY2024.
31	Icahn School of Medicine At Mount Sinai Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$22,320,134	0.5%	Rank history: #18 in FY2021, #37 in FY2022, #28 in FY2023 and #26 in FY2024; down 5 since FY2024.
32	ABT Global LLC 2 awardees Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$22,092,979	0.5%	Rank history: #11 in FY2021, #9 in FY2022, #22 in FY2023 and #16 in FY2024; down 16 since FY2024.
33	Melinta Therapeutics, LLC Top agencies HHS (Department of Health and Human Services)	$21,335,789	0.5%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2023 and not on the FY2024 list; up 89 since FY2024.
34	UnitedHealth Group Incorporated Through The Lewin Group, Inc. Top agencies HHS (Department of Health and Human Services)	$20,990,121	0.5%	Rank history: not on the FY2021–FY2022 lists, #88 in FY2023 and #24 in FY2024; down 10 since FY2024.
35	SNA International LLC Top agencies DHA (Defense Health Agency)	$20,961,983	0.5%	Rank history: #38 in FY2021, #51 in FY2022, #60 in FY2023 and #40 in FY2024; up 5 since FY2024.
36	Mayo Clinic Top agencies HHS (Department of Health and Human Services)	$20,860,175	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
37	Virginia Commonwealth University Health System Authority Through Virginia Polytechnic Institute & State University Top agencies HHS (Department of Health and Human Services)	$20,308,180	0.5%	Rank history: not on the FY2021–FY2024 lists; up 309 since FY2024.
38	Osivax Top agencies HHS (Department of Health and Human Services)	$20,229,361	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
39	The Regents of the University of California. San Francisco Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$20,219,723	0.5%	Rank history: not on the FY2021–FY2024 lists; up 64 since FY2024.
40	Prenosis, Inc. Top agencies HHS (Department of Health and Human Services)	$20,000,000	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
41	Poppy Health, Inc. Top agencies HHS (Department of Health and Human Services)	$19,601,012	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
42	Danaher Corporation 5 awardees, including Global Life Sciences Solutions USA LLC, Cepheid and Leica Microsystems Inc. Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$19,488,655	0.4%	Rank history: not on the FY2021–FY2024 lists; up 129 since FY2024.
43	Public Health Vaccines LLC Top agencies HHS (Department of Health and Human Services)	$19,456,972	0.4%	Rank history: #61 in FY2021, not on the FY2022–FY2023 lists and #100 in FY2024; up 57 since FY2024.
44	University Lab Partners Top agencies HHS (Department of Health and Human Services)	$19,092,350	0.4%	Rank history: not on the FY2021–FY2024 lists; up 201 since FY2024.
45	Abbott Laboratories Top agencies HHS (Department of Health and Human Services)	$18,896,950	0.4%	Rank history: not on the FY2021 list, #29 in FY2022 and not on the FY2023–FY2024 lists; returned.
46	Ophirex, Inc. Top agencies DHA (Defense Health Agency)	$18,539,085	0.4%	Rank history: not on the FY2021 list, #65 in FY2022 and not on the FY2023–FY2024 lists; up 94 since FY2024.
47	Kernal Biologics, Inc. Top agencies HHS (Department of Health and Human Services)	$18,177,254	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
48	University System of Maryland 2 awardees, including University of Maryland, Baltimore and University of Maryland, College Park Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) DHA (Defense Health Agency)	$18,066,650	0.4%	Rank history: #54 in FY2021, #83 in FY2022, #72 in FY2023 and not on the FY2024 list; returned.
49	American Institutes for Research In the Behavioral Sciences Top agencies HHS (Department of Health and Human Services)	$17,965,446	0.4%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2024; down 7 since FY2024.
50	Goldbelt, Incorporated 2 awardees, including Goldbelt C6, LLC and Goldbelt Apex, LLC Top agencies DHA (Defense Health Agency) Navy (Department of the Navy)	$17,766,326	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
51	Sri International Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$17,487,469	0.4%	Rank history: #23 in FY2021, #27 in FY2022, #39 in FY2023 and #31 in FY2024; down 20 since FY2024.
52	Johns Hopkins University 3 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$17,019,970	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
53	4J Therapeutics Inc. Top agencies HHS (Department of Health and Human Services)	$16,992,133	0.4%	Rank history: not on the FY2021–FY2023 lists and #41 in FY2024; down 12 since FY2024.
54	North Dakota University System Through University of North Dakota Top agencies HHS (Department of Health and Human Services)	$16,952,932	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
55	Thermo Electron Corporation Through Fisher Bioservices Inc. Top agencies HHS (Department of Health and Human Services)	$16,771,268	0.4%	Rank history: #46 in FY2021, #12 in FY2022, #67 in FY2023 and not on the FY2024 list; up 317 since FY2024.
56	ST Jude Children's Research Hospital Inc. Top agencies HHS (Department of Health and Human Services)	$16,251,997	0.4%	Rank history: #32 in FY2021, #67 in FY2022, #55 in FY2023 and #45 in FY2024; down 11 since FY2024.
57	University of Texas System 6 awardees, including The Univeristy of Texas M.d. Anderson Cancer Center, University of Texas Medical Branch At Galveston and University of Texas At Austin Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$16,094,349	0.4%	Rank history: #78 in FY2021, #93 in FY2022 and not on the FY2023–FY2024 lists; up 388 since FY2024.
58	Cellphire, Inc. Top agencies DHA (Defense Health Agency)	$15,814,451	0.4%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2024; down 21 since FY2024.
59	Vitakey Inc. Top agencies HHS (Department of Health and Human Services)	$15,426,816	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
60	Precision for Medicine, Inc. Top agencies HHS (Department of Health and Human Services)	$14,308,784	0.3%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2024; up 5 since FY2024.
61	Seattle Children's Hospital Top agencies HHS (Department of Health and Human Services)	$14,256,955	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
62	Bering Straits Native Corporation 3 awardees, including Kapili Services, LLC, Laulima Government Solutions, LLC and Po`okela Solutions, LLC Top agencies DHA (Defense Health Agency) Navy (Department of the Navy) Army (Department of the Army)	$14,159,532	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
63	Marpam Pharma LLC Top agencies HHS (Department of Health and Human Services)	$14,131,077	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
64	Emory University Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$13,672,790	0.3%	Rank history: #59 in FY2021, #97 in FY2022, #77 in FY2023 and #71 in FY2024; up 7 since FY2024.
65	Fred Hutchinson Cancer Center Top agencies HHS (Department of Health and Human Services)	$13,558,094	0.3%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and #59 in FY2024; down 6 since FY2024.
66	Rafa Laboratories Ltd Top agencies HHS (Department of Health and Human Services)	$13,437,694	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
67	University of Georgia Research Foundation, Inc. Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$13,384,917	0.3%	Rank history: #36 in FY2021, #59 in FY2022, #71 in FY2023 and #61 in FY2024; down 6 since FY2024.
68	Teledyne Flir Unmanned Ground Systems Inc 3 awardees, including Teledyne Brown Engineering, Inc. and Teledyne Instruments, Inc. Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs)	$13,117,070	0.3%	Rank history: #42 in FY2021, #82 in FY2022, #81 in FY2023 and #49 in FY2024; down 19 since FY2024.
69	Coriell Institute for Medical Research, Inc. Top agencies HHS (Department of Health and Human Services)	$13,064,466	0.3%	Rank history: not on the FY2021–FY2024 lists; up 116 since FY2024.
70	University of California, San Diego Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$13,019,554	0.3%	Rank history: not on the FY2021–FY2024 lists; up 105 since FY2024.
71	Charles River Laboratories International Inc. Through Charles River Laboratories, Inc. Top agencies HHS (Department of Health and Human Services)	$12,977,527	0.3%	Rank history: not on the FY2021–FY2023 lists and #93 in FY2024; up 22 since FY2024.
72	Tempus AI, Inc. Top agencies HHS (Department of Health and Human Services)	$12,741,975	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
73	Tessera Therapeutics, Inc. Top agencies HHS (Department of Health and Human Services)	$11,891,248	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
74	Rho Federal Systems Division Inc. Top agencies HHS (Department of Health and Human Services)	$11,561,080	0.3%	Rank history: not on the FY2021–FY2024 lists; up 404 since FY2024.
75	Crossject SA Top agencies HHS (Department of Health and Human Services)	$11,291,005	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
76	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies HHS (Department of Health and Human Services)	$11,260,885	0.3%	Rank history: not on the FY2021 list, #79 in FY2022, #75 in FY2023 and #55 in FY2024; down 21 since FY2024.
77	Wake Forest University Through Wake Forest University Health Sciences Top agencies HHS (Department of Health and Human Services)	$11,146,920	0.3%	Rank history: not on the FY2021 list, #91 in FY2022, #90 in FY2023 and #96 in FY2024; up 19 since FY2024.
78	Beckman Research Institute of the City of Hope Top agencies HHS (Department of Health and Human Services)	$11,116,158	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
79	Immunovec, Inc. Top agencies HHS (Department of Health and Human Services)	$11,049,460	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
80	University of California, LOS Angeles Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$10,743,334	0.2%	Rank history: not on the FY2021–FY2024 lists; up 57 since FY2024.
81	Biolytical Laboratories Inc. Top agencies Army (Department of the Army)	$10,517,684	0.2%	Rank history: not on the FY2021–FY2024 lists; up 95 since FY2024.
82	National Jewish Health Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$10,233,402	0.2%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2024; down 5 since FY2024.
83	University of Utah Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$9,844,950	0.2%	Rank history: #95 in FY2021, #90 in FY2022, #78 in FY2023 and #57 in FY2024; down 26 since FY2024.
84	Culmen International, LLC Top agencies Navy (Department of the Navy) DHA (Defense Health Agency)	$9,781,803	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
85	Fundacion Inciensa Top agencies HHS (Department of Health and Human Services)	$9,556,946	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
86	Vysnova Partners LLC Top agencies DHA (Defense Health Agency) Navy (Department of the Navy)	$9,550,223	0.2%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2024; down 40 since FY2024.
87	PGI Holding Corporation Through Psychogenics Inc. Top agencies HHS (Department of Health and Human Services)	$9,482,040	0.2%	Rank history: #73 in FY2021, #70 in FY2022 and not on the FY2023–FY2024 lists; returned.
88	Bioqual, Inc. Top agencies HHS (Department of Health and Human Services)	$9,354,713	0.2%	Rank history: not on the FY2021 list, #80 in FY2022, #69 in FY2023 and #76 in FY2024; down 12 since FY2024.
89	Indivior Inc. Top agencies HHS (Department of Health and Human Services)	$9,329,996	0.2%	Rank history: not on the FY2021–FY2023 lists and #73 in FY2024; down 16 since FY2024.
90	Abraxas Alliance Inc. Top agencies HHS (Department of Health and Human Services)	$9,219,028	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
91	Deloitte Through Deloitte Consulting LLP Top agencies HHS (Department of Health and Human Services)	$9,153,964	0.2%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2024; down 59 since FY2024.
92	Theradex Systems, Inc. Top agencies HHS (Department of Health and Human Services)	$9,117,357	0.2%	Rank history: not on the FY2021–FY2023 lists and #89 in FY2024; down 3 since FY2024.
93	Regents of the University of Michigan Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$9,057,280	0.2%	Rank history: #94 in FY2021, #81 in FY2022, #87 in FY2023 and #83 in FY2024; down 10 since FY2024.
94	Bristol Bay Native Corporation 3 awardees, including Eagle Global Scientific, LLC, Eagle Integrated Services, LLC and Glacier Support Services, LLC Top agencies DHA (Defense Health Agency)	$9,014,375	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
95	The Trustees of the University of Pennsylvania Top agencies HHS (Department of Health and Human Services)	$8,866,657	0.2%	Rank history: #43 in FY2021, #39 in FY2022, #62 in FY2023 and #68 in FY2024; down 27 since FY2024.
96	Odyssey Systems Consulting Group, Ltd. Top agencies DHA (Defense Health Agency) Navy (Department of the Navy)	$8,844,907	0.2%	Rank history: #93 in FY2021 and not on the FY2022–FY2024 lists; up 57 since FY2024.
97	Hemoglobin Oxygen Therapeutics LLC Top agencies DHA (Defense Health Agency)	$8,740,049	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
98	New York Genome Center, Inc. Top agencies HHS (Department of Health and Human Services)	$8,669,968	0.2%	Rank history: not on the FY2021–FY2023 lists and #88 in FY2024; down 10 since FY2024.
99	Orexo AB Through Orexo US Inc. Top agencies HHS (Department of Health and Human Services)	$8,450,715	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
100	Strm.bio Incorporated Top agencies HHS (Department of Health and Human Services)	$8,375,271	0.2%	Rank history: not on the FY2021–FY2024 lists; new.

Rankings for the codes under PSC AN

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 $4.45 billion 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