Top 100 Contractors in PSC AC23: National Defense R&D Services; Atomic Energy Defense Activities; Experimental Development, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Jacobs Engineering Group Inc. Through Amentum Technology, Inc. Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$273,995,373	16.0%	Rank history: #4 in FY2022, #4 in FY2023, #6 in FY2024 and not on the FY2025 list; unchanged since FY2020.
2	The Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Army (Department of the Army)	$187,908,514	11.0%	Rank history: #3 in FY2022, #5 in FY2023, #10 in FY2024 and not on the FY2025 list; up 1 since FY2020.
3	The Boeing Company 6 awardees Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency) WHS (DOD Washington Headquarters Service)	$183,417,598	10.7%	Rank history: #2 in FY2022, #2 in FY2023, #3 in FY2024 and #5 in FY2025; down 1 since FY2020.
4	Lockheed Martin Corporation 10 awardees Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency) SDA (Space Development Agency)	$157,051,605	9.2%	Rank history: #1 in FY2022, #6 in FY2023, #2 in FY2024 and #2 in FY2025; up 13 since FY2020.
5	Northrop Grumman Corporation 6 awardees, including Northrop Grumman Systems Corporation and Alliant Techsystems Operations LLC Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army) USAF (Department of the Air Force)	$144,905,571	8.4%	Rank history: #5 in FY2022, #3 in FY2023, #4 in FY2024 and #6 in FY2025; down 1 since FY2020.
6	Decibel Research, Inc. Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$68,489,908	4.0%	Rank history: #26 in FY2022, #17 in FY2023, #53 in FY2024 and not on the FY2025 list; up 7 since FY2020.
7	L3Harris Technologies, Inc. 2 awardees, including Fisica Applied Technologies, Inc. Top agencies OSD (Office of the Secretary of Defense) SDA (Space Development Agency) MDA (DOD Missile Defense Agency)	$43,659,941	2.5%	Rank history: #6 in FY2022, not on the FY2023 list, #21 in FY2024 and #18 in FY2025; up 58 since FY2020.
8	Utah State University Through Utah State University Space Dynamics Laboratory Top agencies MDA (DOD Missile Defense Agency) Navy (Department of the Navy)	$38,792,313	2.3%	Rank history: #11 in FY2022, #7 in FY2023, #12 in FY2024 and not on the FY2025 list; down 1 since FY2020.
9	The Charles Stark Draper Laboratory, Inc. Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency)	$37,266,631	2.2%	Rank history: #13 in FY2022, #37 in FY2023, #55 in FY2024 and #8 in FY2025; unchanged since FY2020.
10	Arctic Slope Regional Corporation 3 awardees, including Analytical Services, Inc., AS and D, LLC and Inuteq, LLC Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Army (Department of the Army)	$34,964,952	2.0%	Rank history: #10 in FY2022, #8 in FY2023, #9 in FY2024 and #10 in FY2025; down 2 since FY2020.
11	Space Exploration Technologies Corp. Top agencies OSD (Office of the Secretary of Defense) SDA (Space Development Agency)	$34,310,304	2.0%	Rank history: #8 in FY2022, #23 in FY2023, #54 in FY2024 and #15 in FY2025; new, not ranked in FY2020.
12	York Space Systems LLC Top agencies OSD (Office of the Secretary of Defense)	$33,489,893	2.0%	Rank history: #9 in FY2022, #20 in FY2023, #23 in FY2024 and #20 in FY2025; up 3 since FY2020.
13	General Atomic Technologies Corporation 4 awardees, including General Atomics Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army) OSD (Office of the Secretary of Defense)	$31,851,041	1.9%	Rank history: #22 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
14	Radiance Technologies Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$29,772,432	1.7%	Rank history: #14 in FY2022, #11 in FY2023, #39 in FY2024 and not on the FY2025 list; down 2 since FY2020.
15	Axient LLC Top agencies USAF (Department of the Air Force)	$20,438,978	1.2%	Rank history: #12 in FY2022, #9 in FY2023, #11 in FY2024 and #12 in FY2025; up 8 since FY2020.
16	Georgia TECH Research Corp Through Georgia TECH Applied Research Corp Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$20,275,452	1.2%	Rank history: #36 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
17	Def-Logix Inc. Top agencies USAF (Department of the Air Force)	$20,210,168	1.2%	Rank history: #18 in FY2022, #14 in FY2023, #14 in FY2024 and #17 in FY2025; new, not ranked in FY2020.
18	Colsa Corp Top agencies MDA (DOD Missile Defense Agency)	$19,333,211	1.1%	Rank history: #17 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
19	The Johns Hopkins University Applied Physics Laboratory LLC Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Army (Department of the Army)	$18,387,623	1.1%	Rank history: not on the FY2022–FY2023 lists, #5 in FY2024 and not on the FY2025 list; up 12 since FY2020.
20	Modern Technology Solutions, Inc. Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$13,522,172	0.8%	Rank history: #20 in FY2022, #15 in FY2023, #18 in FY2024 and #19 in FY2025; down 4 since FY2020.
21	RTX Corporation 7 awardees, including Raytheon Company Top agencies WHS (DOD Washington Headquarters Service) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$13,139,154	0.8%	Rank history: #7 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; down 10 since FY2020.
22	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$11,825,360	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	Ndp, LLC Top agencies USAF (Department of the Air Force)	$11,000,000	0.6%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
24	NOU Systems Inc. Top agencies MDA (DOD Missile Defense Agency)	$9,491,240	0.6%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
25	Parsons Corporation 3 awardees, including Ndp, LLC and Parsons Government Services Inc. Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$6,781,779	0.4%	Rank history: #16 in FY2022, #12 in FY2023, #16 in FY2024 and #11 in FY2025; up 53 since FY2020.
26	Valt Enterprizes, Inc. Top agencies MDA (DOD Missile Defense Agency)	$6,477,808	0.4%	Rank history: not on the FY2022 list, #57 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
27	Sonalysts Inc. Top agencies MDA (DOD Missile Defense Agency)	$6,196,000	0.4%	Rank history: #33 in FY2022, #25 in FY2023, #24 in FY2024 and #22 in FY2025; unchanged since FY2020.
28	The University of Alabama System Through The University of Alabama In Huntsville Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) DOE (Department of Energy)	$6,151,183	0.4%	Rank history: #67 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
29	State of Alaska Through Alaska Aerospace Corp Top agencies MDA (DOD Missile Defense Agency)	$5,833,389	0.3%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
30	Mentis Sciences Inc. Top agencies MDA (DOD Missile Defense Agency) DLA (Defense Logistics Agency)	$5,818,204	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	Ierus Technologies Inc. Top agencies MDA (DOD Missile Defense Agency)	$5,674,496	0.3%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
32	Canyon Consulting, LLC Top agencies USAF (Department of the Air Force)	$5,573,656	0.3%	Rank history: #40 in FY2022, #34 in FY2023, #31 in FY2024 and #35 in FY2025; up 2 since FY2020.
33	Capital Composites Top agencies Navy (Department of the Navy)	$5,410,582	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	CFD Research Corporation Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$5,221,996	0.3%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; up 42 since FY2020.
35	Triton Systems, Inc. Top agencies MDA (DOD Missile Defense Agency)	$5,184,495	0.3%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
36	Elbit Systems Ltd Through Elbit Systems BMD and Land EW - Elisra Ltd Top agencies MDA (DOD Missile Defense Agency)	$5,075,132	0.3%	Rank history: #32 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
37	Energy and Security Group, LLC Top agencies MDA (DOD Missile Defense Agency)	$4,992,240	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Amentum Technology, Inc. Top agencies MDA (DOD Missile Defense Agency)	$4,659,939	0.3%	Rank history: not on the FY2022–FY2023 lists, #7 in FY2024 and #16 in FY2025; down 33 since FY2020.
39	Digiflight Incorporated Top agencies Army (Department of the Army)	$3,661,809	0.2%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
40	Corvid Technologies, LLC Top agencies MDA (DOD Missile Defense Agency)	$3,300,702	0.2%	Rank history: #24 in FY2022, #58 in FY2023, #50 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
41	Scitec Innovations LLC Top agencies SDA (Space Development Agency) MDA (DOD Missile Defense Agency) OSD (Office of the Secretary of Defense)	$3,262,675	0.2%	Rank history: #28 in FY2022, not on the FY2023–FY2024 lists and #46 in FY2025; down 6 since FY2020.
42	Atmospheric Science Technology LLC Top agencies Army (Department of the Army)	$3,224,985	0.2%	Rank history: #27 in FY2022, #38 in FY2023, #57 in FY2024 and not on the FY2025 list; unchanged since FY2020.
43	Materials Research & Design Inc. Top agencies MDA (DOD Missile Defense Agency)	$3,110,351	0.2%	Rank history: not on the FY2022–FY2023 lists, #34 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
44	Cummings Aerospace, Inc. Top agencies MDA (DOD Missile Defense Agency)	$3,076,365	0.2%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
45	Capella Space Corporation Top agencies SDA (Space Development Agency)	$2,971,006	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Aevum Inc. Top agencies MDA (DOD Missile Defense Agency)	$2,959,091	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	Kratos Defense & Security Solutions, Inc. Through Kratos Defense & Rocket Support Services, Inc. Top agencies MDA (DOD Missile Defense Agency)	$2,950,713	0.2%	Rank history: not on the FY2022 list, #44 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2020.
48	Novi Space Inc. Top agencies MDA (DOD Missile Defense Agency)	$2,936,712	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	Sri International Top agencies OSD (Office of the Secretary of Defense)	$2,817,962	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Numerica Corporation Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$2,612,870	0.2%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
51	Archarithms Inc. Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$2,408,617	0.1%	Rank history: not on the FY2022–FY2025 lists; up 29 since FY2020.
52	Control Vision, Inc. Top agencies MDA (DOD Missile Defense Agency)	$2,299,995	0.1%	Rank history: #43 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
53	Predasar Corp Top agencies USAF (Department of the Air Force)	$2,232,230	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Teledyne Technologies Incorporated 2 awardees, including Teledyne Scientific & Imaging, LLC Top agencies WHS (DOD Washington Headquarters Service)	$2,149,292	0.1%	Rank history: not on the FY2022 list, #24 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
55	Seemann Composites, LLC Through Materials Sciences LLC Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$2,087,209	0.1%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 14 since FY2020.
56	The Exone Company Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$1,895,104	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Fifth Gait Technologies, Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,800,910	0.1%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
58	Bluehalo Labs, LLC Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$1,736,499	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
59	Scientific Systems Company, Inc. Top agencies SDA (Space Development Agency)	$1,730,725	0.1%	Rank history: #73 in FY2022, #33 in FY2023, not on the FY2024 list and #37 in FY2025; new, not ranked in FY2020.
60	Geneva Technologies, Inc. Top agencies USAF (Department of the Air Force)	$1,707,633	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Peregrine Falcon Corp Top agencies MDA (DOD Missile Defense Agency)	$1,699,932	0.1%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
62	Systima Technologies Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,674,776	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Polymaterials App, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,511,120	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Ram Laboratories Top agencies MDA (DOD Missile Defense Agency)	$1,509,997	0.1%	Rank history: not on the FY2022–FY2024 lists and #52 in FY2025; new, not ranked in FY2020.
65	Secmation LLC Top agencies MDA (DOD Missile Defense Agency)	$1,507,415	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Reactive Metals International Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,499,962	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Gray Analytics, Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,499,884	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Edaptive Computing Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,499,818	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Systems & Processes Engineering Corp Top agencies MDA (DOD Missile Defense Agency)	$1,499,624	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Symplectic Engineering Corporation Top agencies MDA (DOD Missile Defense Agency)	$1,499,605	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Ram Photonics LLC Top agencies MDA (DOD Missile Defense Agency)	$1,499,576	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Emag Technologies Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,498,563	0.1%	Rank history: not on the FY2022–FY2023 lists, #33 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
73	Vadum Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,498,409	0.1%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
74	Polaris Sensor Technologies, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,497,972	0.1%	Rank history: #85 in FY2022, #54 in FY2023, #35 in FY2024 and not on the FY2025 list; up 34 since FY2020.
75	Beyond Photonics, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,497,936	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Innoflight, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,497,093	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Technology Service Corp Top agencies MDA (DOD Missile Defense Agency)	$1,495,675	0.1%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
78	Stilman Advanced Strategies, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,494,965	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	Cubic Aerospace, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,494,847	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Aptima Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,491,986	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Creare LLC Top agencies MDA (DOD Missile Defense Agency)	$1,489,673	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Drywired International, LLC Through Nanoarmor, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,484,153	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Seed Innovations, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,479,547	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Black River Systems Company, Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,472,836	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Vector Atomic Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,443,797	0.1%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
86	Karagozian & Case, Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,418,566	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Knowledge Based Systems Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,407,796	0.1%	Rank history: not on the FY2022–FY2023 lists, #48 in FY2024 and not on the FY2025 list; down 41 since FY2020.
88	Georgia TECH Applied Research Corp Top agencies MDA (DOD Missile Defense Agency)	$1,344,008	0.1%	Rank history: not on the FY2022–FY2024 lists and #26 in FY2025; down 62 since FY2020.
89	Qtec, Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,327,335	0.1%	Rank history: not on the FY2022 list, #61 in FY2023 and not on the FY2024–FY2025 lists; down 39 since FY2020.
90	Davidson Technologies Inc. 2 awardees Top agencies MDA (DOD Missile Defense Agency)	$1,280,341	0.1%	Rank history: not on the FY2022–FY2023 lists, #59 in FY2024 and not on the FY2025 list; down 71 since FY2020.
91	Welkin Sciences, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,208,988	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Peopletec, Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,207,098	0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
93	Innovative Defense Technologies, LLC Top agencies MDA (DOD Missile Defense Agency)	$1,143,841	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Analytical Services, Inc. Top agencies MDA (DOD Missile Defense Agency)	$1,142,021	0.1%	Rank history: not on the FY2022–FY2025 lists; down 69 since FY2020.
95	Wales Systems Engineering and Logistics Ltd. Top agencies MDA (DOD Missile Defense Agency)	$1,135,238	0.1%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; down 42 since FY2020.
96	Physical Sciences Inc. Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$1,129,796	0.1%	Rank history: #39 in FY2022, #63 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
97	By Light Professional It Services LLC Top agencies USAF (Department of the Air Force)	$1,091,686	0.1%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
98	Viasat Inc. Top agencies USAF (Department of the Air Force)	$1,030,141	0.1%	Rank history: #23 in FY2022, #18 in FY2023, #17 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
99	Attollo Engineering, LLC Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$975,486	0.1%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
100	Freedom Photonics LLC Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$865,970	0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; down 11 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 $1.72 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