Top 100 Contractors in PSC AN11: Health R&D Services; Health Care Services; Basic Research, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Modernatx Inc. Top agencies HHS (Department of Health and Human Services)	$443,210,908	39.2%	Rank history: #1 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
2	Westat, Inc. Top agencies HHS (Department of Health and Human Services)	$83,958,925	7.4%	Rank history: #2 in FY2022, #8 in FY2023, #1 in FY2024 and #2 in FY2025; unchanged since FY2020.
3	Allucent Government Services (Us) LLC Top agencies HHS (Department of Health and Human Services)	$34,161,959	3.0%	Rank history: not on the FY2022 list, #2 in FY2023, #32 in FY2024 and not on the FY2025 list; up 148 since FY2020.
4	Abss Solutions Inc. Top agencies USAF (Department of the Air Force)	$27,644,122	2.4%	Rank history: #5 in FY2022, not on the FY2023 list, #5 in FY2024 and #23 in FY2025; up 6 since FY2020.
5	Icon Government and Public Health Solutions Inc. Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$20,383,918	1.8%	Rank history: #16 in FY2022, #1 in FY2023 and not on the FY2024–FY2025 lists; up 165 since FY2020.
6	The Emmes Company, LLC Top agencies HHS (Department of Health and Human Services)	$18,647,328	1.7%	Rank history: #6 in FY2022, #12 in FY2023, #4 in FY2024 and #5 in FY2025; up 2 since FY2020.
7	Vitalant Top agencies HHS (Department of Health and Human Services)	$17,181,962	1.5%	Rank history: #9 in FY2022, not on the FY2023 list, #16 in FY2024 and not on the FY2025 list; down 3 since FY2020.
8	Kaiser Foundation Health Plan of Washington 2 awardees, including Kaiser Foundation Hospitals Top agencies HHS (Department of Health and Human Services)	$16,582,132	1.5%	Rank history: #8 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
9	State of Arizona Through University of Arizona Top agencies HHS (Department of Health and Human Services)	$15,002,902	1.3%	Rank history: #7 in FY2022 and not on the FY2023–FY2025 lists; up 10 since FY2020.
10	Technical Resources International, Inc. Top agencies HHS (Department of Health and Human Services)	$12,736,836	1.1%	Rank history: #11 in FY2022, #3 in FY2023, #3 in FY2024 and #7 in FY2025; up 107 since FY2020.
11	Fincantieri Marine Systems North America Inc. Through Consiglio Nazionale Delle Ricerche - Istituto DI Ricerca Genetica E Biomedica Top agencies HHS (Department of Health and Human Services)	$11,408,934	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
12	The Children's Hospital Corporation Top agencies HHS (Department of Health and Human Services)	$11,273,788	1.0%	Rank history: #34 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
13	Massachusetts Institute of Technology Top agencies HHS (Department of Health and Human Services)	$11,138,312	1.0%	Rank history: not on the FY2022 list, #89 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
14	University of Louisville Top agencies HHS (Department of Health and Human Services)	$8,572,618	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
15	Charles River Laboratories International Inc. Through Charles River Laboratories, Inc. Top agencies HHS (Department of Health and Human Services)	$8,535,622	0.8%	Rank history: #13 in FY2022, #15 in FY2023, #9 in FY2024 and #4 in FY2025; unchanged since FY2020.
16	Sri International Top agencies HHS (Department of Health and Human Services)	$8,252,221	0.7%	Rank history: #12 in FY2022, #16 in FY2023, #18 in FY2024 and not on the FY2025 list; down 9 since FY2020.
17	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$7,422,448	0.7%	Rank history: #30 in FY2022, #23 in FY2023, #24 in FY2024 and #29 in FY2025; up 5 since FY2020.
18	Triton Systems, Inc. Top agencies Army (Department of the Army)	$7,221,479	0.6%	Rank history: #68 in FY2022, #91 in FY2023, not on the FY2024 list and #90 in FY2025; new, not ranked in FY2020.
19	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) VA (Department of Veterans Affairs)	$7,048,686	0.6%	Rank history: #20 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
20	University of Pittsburgh - of the Commonwealth System of Higher Education Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) VA (Department of Veterans Affairs)	$6,785,907	0.6%	Rank history: #57 in FY2022, #25 in FY2023, #72 in FY2024 and #67 in FY2025; up 42 since FY2020.
21	University of Montana System Through University of Montana Top agencies HHS (Department of Health and Human Services)	$6,405,500	0.6%	Rank history: #21 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
22	T2 Biosystems, Inc. Top agencies HHS (Department of Health and Human Services)	$6,357,371	0.6%	Rank history: #18 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
23	Battelle Memorial Institute 2 awardees, including Battelle National Biodefense Institute, LLC Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$6,288,598	0.6%	Rank history: not on the FY2022 list, #65 in FY2023, #88 in FY2024 and #54 in FY2025; down 2 since FY2020.
24	PPD Development L.P. Top agencies HHS (Department of Health and Human Services)	$6,131,183	0.5%	Rank history: not on the FY2022–FY2025 lists; up 50 since FY2020.
25	Utah State University Top agencies HHS (Department of Health and Human Services)	$6,056,831	0.5%	Rank history: #35 in FY2022, #62 in FY2023, #42 in FY2024 and #87 in FY2025; up 4 since FY2020.
26	State of California Controllers Office 5 awardees, including University of California, LOS Angeles, University of California, San Diego and The Regents of the University of California. San Francisco Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$5,708,742	0.5%	Rank history: #24 in FY2022, #19 in FY2023, #61 in FY2024 and not on the FY2025 list; up 108 since FY2020.
27	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies HHS (Department of Health and Human Services)	$5,676,566	0.5%	Rank history: #14 in FY2022, #14 in FY2023, #7 in FY2024 and #14 in FY2025; new, not ranked in FY2020.
28	University of Texas System 4 awardees, including University of Texas Medical Branch At Galveston, The University of Texas Health Science Center At San Antonio and The University of Texas Southwestern Medical Center Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$5,545,625	0.5%	Rank history: #33 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
29	University of Washington Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$5,523,520	0.5%	Rank history: #61 in FY2022, #44 in FY2023, #35 in FY2024 and #97 in FY2025; up 15 since FY2020.
30	The Administrators of Tulane Educational Fund 2 awardees Top agencies HHS (Department of Health and Human Services)	$5,450,176	0.5%	Rank history: #36 in FY2022, #48 in FY2023, #97 in FY2024 and #27 in FY2025; down 13 since FY2020.
31	Brigham & Womens Hospital Inc 3 awardees, including The Mclean Hospital Corporation and The General Hospital Corporation Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) VA (Department of Veterans Affairs)	$5,043,865	0.4%	Rank history: #17 in FY2022, #38 in FY2023, #74 in FY2024 and #72 in FY2025; up 8 since FY2020.
32	Precision Bioservices Inc. Through Precision for Medicine, Inc. Top agencies HHS (Department of Health and Human Services)	$5,003,225	0.4%	Rank history: #37 in FY2022, #21 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
33	Lovelace Respiratory Through Lovelace Biomedical and Environmental Research Institute, Inc. Top agencies HHS (Department of Health and Human Services)	$4,936,697	0.4%	Rank history: #52 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; down 20 since FY2020.
34	Rutgers, the State University 3 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$4,870,403	0.4%	Rank history: #43 in FY2022, #54 in FY2023, #41 in FY2024 and #73 in FY2025; down 4 since FY2020.
35	Southern Research Institute Top agencies HHS (Department of Health and Human Services)	$4,834,104	0.4%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
36	Alpha Genesis Inc. Top agencies HHS (Department of Health and Human Services)	$4,358,618	0.4%	Rank history: #39 in FY2022, #32 in FY2023, #12 in FY2024 and #13 in FY2025; down 18 since FY2020.
37	Luna Innovations Incorporated Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$4,008,790	0.4%	Rank history: #97 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; up 60 since FY2020.
38	University of North Carolina at Chapel Hill 2 awardees Top agencies HHS (Department of Health and Human Services)	$3,696,380	0.3%	Rank history: #10 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
39	Icahn School of Medicine at Mount Sinai Top agencies HHS (Department of Health and Human Services)	$3,536,681	0.3%	Rank history: #50 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
40	Yale Univ 2 awardees, including Yale University Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$3,514,400	0.3%	Rank history: #91 in FY2022, not on the FY2023 list, #73 in FY2024 and not on the FY2025 list; down 4 since FY2020.
41	TDA Research, Inc. Top agencies Army (Department of the Army)	$3,496,290	0.3%	Rank history: not on the FY2022–FY2024 lists and #69 in FY2025; new, not ranked in FY2020.
42	Emory University Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$3,379,886	0.3%	Rank history: #44 in FY2022, #52 in FY2023, #40 in FY2024 and #35 in FY2025; down 15 since FY2020.
43	The Trustees of the University of Pennsylvania 2 awardees Top agencies HHS (Department of Health and Human Services)	$3,218,350	0.3%	Rank history: not on the FY2022–FY2023 lists, #100 in FY2024 and not on the FY2025 list; up 32 since FY2020.
44	La Jolla Institute for Immunology Top agencies HHS (Department of Health and Human Services)	$3,202,741	0.3%	Rank history: #46 in FY2022, #50 in FY2023, #30 in FY2024 and #31 in FY2025; down 3 since FY2020.
45	CFD Research Corporation Top agencies DHA (Defense Health Agency) Army (Department of the Army) HHS (Department of Health and Human Services)	$3,182,816	0.3%	Rank history: #72 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
46	University of Oklahoma Top agencies HHS (Department of Health and Human Services)	$3,166,459	0.3%	Rank history: #71 in FY2022, #43 in FY2023, #27 in FY2024 and not on the FY2025 list; up 131 since FY2020.
47	Duke University Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$3,102,705	0.3%	Rank history: #23 in FY2022, #24 in FY2023, #36 in FY2024 and #17 in FY2025; up 22 since FY2020.
48	ST Jude Children's Research Hospital Inc. Top agencies HHS (Department of Health and Human Services)	$3,095,955	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	Coriell Institute for Medical Research, Inc. Top agencies HHS (Department of Health and Human Services)	$2,826,049	0.3%	Rank history: #64 in FY2022, #49 in FY2023, #60 in FY2024 and #66 in FY2025; down 1 since FY2020.
50	Aetion Inc. Top agencies HHS (Department of Health and Human Services)	$2,696,737	0.2%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
51	The University of Mississippi Top agencies HHS (Department of Health and Human Services)	$2,685,075	0.2%	Rank history: #70 in FY2022, #57 in FY2023, #57 in FY2024 and not on the FY2025 list; up 15 since FY2020.
52	Regents of the University of Michigan Top agencies HHS (Department of Health and Human Services)	$2,669,761	0.2%	Rank history: #25 in FY2022, #28 in FY2023, #25 in FY2024 and #28 in FY2025; down 28 since FY2020.
53	Charles River Analytics, Inc. Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$2,599,878	0.2%	Rank history: not on the FY2022–FY2023 lists, #71 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
54	Irisys, Inc. Through Societal Cdmo San Diego, LLC Top agencies HHS (Department of Health and Human Services)	$2,587,932	0.2%	Rank history: not on the FY2022–FY2025 lists; up 41 since FY2020.
55	Oregon Health & Science University Top agencies HHS (Department of Health and Human Services)	$2,565,650	0.2%	Rank history: #78 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
56	Laulima Government Solutions, LLC Top agencies Army (Department of the Army)	$2,495,169	0.2%	Rank history: #73 in FY2022, #98 in FY2023, #56 in FY2024 and #61 in FY2025; up 122 since FY2020.
57	University of Georgia Research Foundation, Inc. Top agencies HHS (Department of Health and Human Services)	$2,461,215	0.2%	Rank history: not on the FY2022 list, #93 in FY2023, #81 in FY2024 and #57 in FY2025; down 11 since FY2020.
58	Creare LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$2,390,619	0.2%	Rank history: #93 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
59	Cherokee Nation 2 awardees, including Cherokee Federal Solutions, L.L.C. Top agencies DOT (Department of Transportation)	$2,390,465	0.2%	Rank history: #87 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
60	Zata Pharmaceuticals, Inc. Top agencies HHS (Department of Health and Human Services)	$2,294,544	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Virginia Commonwealth University Top agencies HHS (Department of Health and Human Services)	$2,183,669	0.2%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
62	Spero Therapeutics, Inc. Top agencies HHS (Department of Health and Human Services)	$2,089,779	0.2%	Rank history: not on the FY2022 list, #39 in FY2023, #33 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
63	Commonwealth Scientific and Industrial Research Organisation Top agencies HHS (Department of Health and Human Services)	$2,053,902	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Embleema Inc. Top agencies HHS (Department of Health and Human Services)	$1,992,223	0.2%	Rank history: #56 in FY2022, #83 in FY2023, #54 in FY2024 and #79 in FY2025; new, not ranked in FY2020.
65	The University of Chicago Top agencies HHS (Department of Health and Human Services)	$1,977,288	0.2%	Rank history: not on the FY2022 list, #88 in FY2023, #91 in FY2024 and not on the FY2025 list; unchanged since FY2020.
66	University of Miami Top agencies HHS (Department of Health and Human Services)	$1,891,753	0.2%	Rank history: #99 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; down 24 since FY2020.
67	American Type Culture Collection Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$1,849,049	0.2%	Rank history: #74 in FY2022, #4 in FY2023, #87 in FY2024 and not on the FY2025 list; up 40 since FY2020.
68	Illinois Institute of Technology Through IIT Research Institute Top agencies HHS (Department of Health and Human Services)	$1,830,404	0.2%	Rank history: #55 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; down 19 since FY2020.
69	International Aids Vaccine Initiative Inc. Top agencies HHS (Department of Health and Human Services)	$1,773,958	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Integrated Biotherapeutics, LLC Top agencies HHS (Department of Health and Human Services)	$1,749,368	0.2%	Rank history: not on the FY2022 list, #80 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
71	University of Wisconsin System 3 awardees, including University of Wisconsin Hospitals and Clinics Authority Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$1,721,021	0.2%	Rank history: #88 in FY2022, #79 in FY2023, #58 in FY2024 and not on the FY2025 list; down 33 since FY2020.
72	Versiti Blood Health, Inc. Top agencies HHS (Department of Health and Human Services)	$1,704,839	0.2%	Rank history: not on the FY2022–FY2023 lists, #64 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
73	Workit Health Inc. Top agencies HHS (Department of Health and Human Services)	$1,699,491	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Information Management Services, Inc. Top agencies HHS (Department of Health and Human Services)	$1,693,836	0.1%	Rank history: #95 in FY2022, #61 in FY2023, #43 in FY2024 and #42 in FY2025; down 27 since FY2020.
75	The Trustees of Columbia University In the City of New York Top agencies HHS (Department of Health and Human Services)	$1,578,430	0.1%	Rank history: not on the FY2022–FY2023 lists, #51 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
76	Technology Management Company, Inc. Top agencies Army (Department of the Army)	$1,574,683	0.1%	Rank history: #96 in FY2022, #69 in FY2023, #48 in FY2024 and not on the FY2025 list; down 8 since FY2020.
77	International Consulting Associates, Inc. Top agencies HHS (Department of Health and Human Services)	$1,558,560	0.1%	Rank history: not on the FY2022–FY2025 lists; down 40 since FY2020.
78	Pharmacology Discovery Services Taiwan, Ltd. Top agencies HHS (Department of Health and Human Services)	$1,512,861	0.1%	Rank history: not on the FY2022–FY2023 lists, #92 in FY2024 and not on the FY2025 list; up 3 since FY2020.
79	Mriglobal Top agencies HHS (Department of Health and Human Services)	$1,512,409	0.1%	Rank history: not on the FY2022 list, #81 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
80	Regents of the University of Minnesota 2 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$1,501,154	0.1%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
81	Aptima Inc. Top agencies Army (Department of the Army)	$1,500,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Infrascan Inc. Top agencies Army (Department of the Army)	$1,500,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Verinetics, Inc. Top agencies HHS (Department of Health and Human Services)	$1,499,999	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Cytosorbents Corporation Through Cytosorbents Medical Inc. Top agencies Army (Department of the Army)	$1,499,987	0.1%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
85	Elektrofi, Inc. Top agencies DHA (Defense Health Agency)	$1,499,982	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Baylor Research Institute Top agencies HHS (Department of Health and Human Services)	$1,499,900	0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
87	We the Village, Inc. Top agencies HHS (Department of Health and Human Services)	$1,497,979	0.1%	Rank history: not on the FY2022–FY2025 lists; up 101 since FY2020.
88	Engineering Acoustics Inc. Top agencies Army (Department of the Army)	$1,497,474	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	B & W TEK Inc. Top agencies HHS (Department of Health and Human Services)	$1,494,724	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Coruna Medical Inc. Top agencies Army (Department of the Army)	$1,494,300	0.1%	Rank history: not on the FY2022–FY2024 lists and #82 in FY2025; new, not ranked in FY2020.
91	Hydrogy, LLC Top agencies DHA (Defense Health Agency)	$1,481,689	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Purdue University Top agencies HHS (Department of Health and Human Services)	$1,461,146	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
93	Trustees of Tufts College Top agencies HHS (Department of Health and Human Services)	$1,439,985	0.1%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
94	Board of Governers State University System of Florida 3 awardees, including University of Florida Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$1,400,789	0.1%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
95	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$1,388,927	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; down 38 since FY2020.
96	Biocryst Pharmaceuticals Inc. Top agencies HHS (Department of Health and Human Services)	$1,383,666	0.1%	Rank history: not on the FY2022–FY2025 lists; down 51 since FY2020.
97	American Foundation for Biological Research Top agencies HHS (Department of Health and Human Services)	$1,352,186	0.1%	Rank history: not on the FY2022 list, #86 in FY2023, #62 in FY2024 and #51 in FY2025; down 17 since FY2020.
98	Oceanit Laboratories Inc. Top agencies Army (Department of the Army)	$1,349,994	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Secretary of State Connecticut 2 awardees, including University of Connecticut Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$1,348,808	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Albany Molecular Research Inc. Through Curia Global Inc. Top agencies HHS (Department of Health and Human Services)	$1,343,336	0.1%	Rank history: not on the FY2022–FY2025 lists; down 60 since FY2020.

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 $1.13 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. 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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