Top 100 Contractors in PSC AC33: National Defense R&D Services; Defense-Related Activities; Experimental Development, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Space Exploration Technologies Corp. Top agencies USAF (Department of the Air Force)	$74,242,198	15.3%	Rank history: #9 in FY2022, #35 in FY2023, #80 in FY2024 and #22 in FY2025; new, not ranked in FY2020.
2	The Boeing Company 3 awardees Top agencies Navy (Department of the Navy)	$67,960,783	14.0%	Rank history: #3 in FY2022, #4 in FY2023, #15 in FY2024 and #15 in FY2025; down 1 since FY2020.
3	Perspecta Inc. 2 awardees, including Peraton Technology Services Inc. and Analex Corporation Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$18,298,789	3.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
4	C3.Ai, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$16,437,833	3.4%	Rank history: #22 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
5	Cubrc, Inc. Top agencies Army (Department of the Army)	$16,284,931	3.4%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
6	International Aids Vaccine Initiative Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$14,713,184	3.0%	Rank history: #38 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
7	Lockheed Martin Corporation 6 awardees, including Lockheed Martin Aculight Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$12,850,780	2.7%	Rank history: #26 in FY2022, #9 in FY2023, not on the FY2024 list and #12 in FY2025; down 3 since FY2020.
8	Applied Research Associates, Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$11,969,224	2.5%	Rank history: #7 in FY2022, #8 in FY2023, #11 in FY2024 and #13 in FY2025; new, not ranked in FY2020.
9	HP Enterprise Services LLC 4 awardees, including Analex Corporation, Peraton Inc. and Peraton Technology Services Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$10,712,766	2.2%	Rank history: #5 in FY2022, #26 in FY2023, #32 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
10	Cummins Inc. Top agencies Army (Department of the Army)	$10,622,260	2.2%	Rank history: #14 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
11	Analytic Services Inc. Through Advanced Technology International Top agencies WHS (DOD Washington Headquarters Service) Navy (Department of the Navy)	$9,519,422	2.0%	Rank history: #6 in FY2022, #3 in FY2023, #8 in FY2024 and not on the FY2025 list; up 1 since FY2020.
12	L3Harris Technologies, Inc. 2 awardees, including L3 Technologies, Inc. Top agencies USAF (Department of the Air Force)	$8,825,880	1.8%	Rank history: not on the FY2022 list, #33 in FY2023, #40 in FY2024 and #26 in FY2025; new, not ranked in FY2020.
13	Macaulay-Brown Inc. Through Enlighten It Consulting LLC Top agencies USAF (Department of the Air Force)	$8,021,340	1.7%	Rank history: #12 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
14	Packet Digital LLC Top agencies USAF (Department of the Air Force)	$6,923,000	1.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
15	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency)	$6,715,481	1.4%	Rank history: #17 in FY2022, #11 in FY2023, #10 in FY2024 and #10 in FY2025; new, not ranked in FY2020.
16	Sri International Top agencies USAF (Department of the Air Force)	$6,660,918	1.4%	Rank history: #32 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
17	General Dynamics Corporation 4 awardees, including General Dynamics Information Technology, Inc., General Dynamics One Source LLC and Applied Physical Sciences Corp Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$6,654,642	1.4%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; new, not ranked in FY2020.
18	Two Six Labs Holdings, Inc. Through Two Six Labs, LLC Top agencies DARPA (Defense Advanced Research Projects Agency)	$6,513,326	1.3%	Rank history: #23 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
19	UI Labs Top agencies DLA (Defense Logistics Agency)	$6,135,386	1.3%	Rank history: #56 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
20	Envisioneering, Inc. Top agencies Navy (Department of the Navy)	$5,758,449	1.2%	Rank history: #30 in FY2022, #48 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
21	Northrop Grumman Corporation Through Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy)	$5,000,000	1.0%	Rank history: #8 in FY2022, #5 in FY2023, #16 in FY2024 and #11 in FY2025; new, not ranked in FY2020.
22	Colsa Corp Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$4,756,806	1.0%	Rank history: #37 in FY2022, #57 in FY2023, #46 in FY2024 and #57 in FY2025; new, not ranked in FY2020.
23	1ST Edge LLC Top agencies Army (Department of the Army)	$4,600,000	0.9%	Rank history: not on the FY2022 list, #63 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
24	6K Inc. Top agencies DLA (Defense Logistics Agency)	$4,525,437	0.9%	Rank history: not on the FY2022 list, #74 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
25	BAE Systems Land & Armaments L.P. Through BAE Systems Information and Electronic Systems Integration Inc. Top agencies OSD (Office of the Secretary of Defense)	$4,482,349	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	Tactical Engineering & Analysis, Inc. Top agencies Navy (Department of the Navy)	$4,215,610	0.9%	Rank history: #15 in FY2022, #20 in FY2023, #23 in FY2024 and #20 in FY2025; new, not ranked in FY2020.
27	Physical Sciences Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$4,192,780	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Icr, Inc. Top agencies USAF (Department of the Air Force) DTRA (Defense Threat Reduction Agency) DARPA (Defense Advanced Research Projects Agency)	$4,151,440	0.9%	Rank history: #4 in FY2022, #7 in FY2023, #19 in FY2024 and #18 in FY2025; new, not ranked in FY2020.
29	Premier Technology, Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$3,871,676	0.8%	Rank history: #55 in FY2022, #61 in FY2023, #54 in FY2024 and #48 in FY2025; new, not ranked in FY2020.
30	Coherent Technical Services, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$3,653,901	0.8%	Rank history: #44 in FY2022, #59 in FY2023, #73 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
31	Toyon Research Corporation Top agencies DTRA (Defense Threat Reduction Agency) OSD (Office of the Secretary of Defense)	$3,534,254	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Echostar Corporation Through Hughes Network Systems LLC Top agencies USAF (Department of the Air Force)	$3,496,722	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	Ball Corp 2 awardees, including BAE Systems Space & Mission Systems Inc. Top agencies USAF (Department of the Air Force)	$3,491,937	0.7%	Rank history: #42 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
34	Exponent Inc. Top agencies Army (Department of the Army)	$3,178,290	0.7%	Rank history: #28 in FY2022, not on the FY2023 list, #55 in FY2024 and #88 in FY2025; new, not ranked in FY2020.
35	DCS Corporation Top agencies Navy (Department of the Navy)	$3,139,960	0.6%	Rank history: #65 in FY2022, #76 in FY2023, #4 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
36	Martin UAV LLC Top agencies Navy (Department of the Navy)	$2,960,379	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	Corvid Technologies, LLC Top agencies OSD (Office of the Secretary of Defense) DTRA (Defense Threat Reduction Agency)	$2,599,989	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Scientific Systems Company, Inc. Top agencies OSD (Office of the Secretary of Defense) DTRA (Defense Threat Reduction Agency)	$2,599,659	0.5%	Rank history: not on the FY2022–FY2024 lists and #47 in FY2025; new, not ranked in FY2020.
39	Georgia TECH Research Corp Through Georgia TECH Applied Research Corp Top agencies DARPA (Defense Advanced Research Projects Agency)	$2,567,599	0.5%	Rank history: #40 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
40	Accelint AI, LLC Top agencies OSD (Office of the Secretary of Defense) DTRA (Defense Threat Reduction Agency)	$2,501,844	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
41	Wavefront Research, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency)	$2,366,784	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	General Electric Company 3 awardees Top agencies DTRA (Defense Threat Reduction Agency) DLA (Defense Logistics Agency)	$2,348,681	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Advanced Systems Supportability Engineering Technologies and Tools, Inc. Top agencies USSOCOM (United States Special Operations Command)	$2,326,108	0.5%	Rank history: #72 in FY2022, #66 in FY2023, #65 in FY2024 and #89 in FY2025; new, not ranked in FY2020.
44	Novetta Solutions, LLC Through Accenture Federal Services LLC Top agencies DTRA (Defense Threat Reduction Agency)	$2,206,465	0.5%	Rank history: #64 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
45	Ion Storage Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$2,088,994	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Fuelx Innovation Inc. Top agencies OSD (Office of the Secretary of Defense)	$1,998,000	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	Bluehalo Labs, LLC 2 awardees Top agencies DTRA (Defense Threat Reduction Agency) USAF (Department of the Air Force)	$1,913,163	0.4%	Rank history: #19 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
48	Niron Magnetics Inc. Top agencies DLA (Defense Logistics Agency)	$1,785,888	0.4%	Rank history: not on the FY2022 list, #29 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
49	Fuse Integration, Inc. Top agencies Navy (Department of the Navy)	$1,690,343	0.3%	Rank history: #11 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
50	Cantada, Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$1,642,643	0.3%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
51	Indesign LLC Top agencies DTRA (Defense Threat Reduction Agency)	$1,517,197	0.3%	Rank history: #63 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
52	Som1101 LLC Top agencies USAF (Department of the Air Force)	$1,499,875	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Dynasil Corporation of America Through Radiation Monitoring Devices, Inc. Top agencies OSD (Office of the Secretary of Defense) DTRA (Defense Threat Reduction Agency)	$1,431,225	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Southwest Research Institute Top agencies DTRA (Defense Threat Reduction Agency)	$1,277,447	0.3%	Rank history: #51 in FY2022, #40 in FY2023, #26 in FY2024 and #36 in FY2025; new, not ranked in FY2020.
55	Opticslah, LLC Top agencies DTRA (Defense Threat Reduction Agency)	$1,180,155	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Combustion Research & Flow Technology Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$1,145,589	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Seacorp, LLC Top agencies Navy (Department of the Navy)	$1,130,000	0.2%	Rank history: #29 in FY2022, #18 in FY2023, #12 in FY2024 and #9 in FY2025; new, not ranked in FY2020.
58	Falkonry Inc. Top agencies USAF (Department of the Air Force)	$1,125,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
59	University of Hawaii Systems Through University of Hawaii Top agencies DTRA (Defense Threat Reduction Agency)	$1,124,565	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Novateur Research Solutions LLC Top agencies DTRA (Defense Threat Reduction Agency)	$1,099,916	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Gamma Reality Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$1,099,848	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	RJ Lee Group Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$1,094,464	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	State of California Controllers Office 3 awardees, including University of California, San Diego, San Diego State University Foundation and University of California Irvine Top agencies DTRA (Defense Threat Reduction Agency) Navy (Department of the Navy)	$1,092,292	0.2%	Rank history: #73 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
64	Boston Fusion Corp Top agencies DTRA (Defense Threat Reduction Agency)	$1,084,145	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Robotic Research Opco, LLC Top agencies DTRA (Defense Threat Reduction Agency) DLA (Defense Logistics Agency)	$1,069,237	0.2%	Rank history: not on the FY2022–FY2023 lists, #84 in FY2024 and #72 in FY2025; new, not ranked in FY2020.
66	LMI Consulting, LLC Top agencies DLA (Defense Logistics Agency)	$1,068,176	0.2%	Rank history: #85 in FY2022, #71 in FY2023, #70 in FY2024 and #70 in FY2025; down 53 since FY2020.
67	Cana LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,014,301	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Parts Life Inc. 2 awardees, including Deval Life Cycle Support LLC Top agencies WHS (DOD Washington Headquarters Service) DLA (Defense Logistics Agency)	$1,005,315	0.2%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
69	Oceanit Laboratories Inc. Top agencies DLA (Defense Logistics Agency)	$1,000,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Petrus J Barnard Top agencies DLA (Defense Logistics Agency)	$1,000,000	0.2%	Rank history: #82 in FY2022, not on the FY2023 list, #99 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
71	Aerosol Devices Inc. Top agencies DLA (Defense Logistics Agency)	$1,000,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Two Six Labs, LLC Top agencies DARPA (Defense Advanced Research Projects Agency)	$999,999	0.2%	Rank history: not on the FY2022 list, #14 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
73	Brighton Cromwell LLC Top agencies DLA (Defense Logistics Agency)	$999,987	0.2%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
74	Qortek Inc. Top agencies DLA (Defense Logistics Agency)	$999,833	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Cepeda Associates, Inc. Top agencies DLA (Defense Logistics Agency)	$996,352	0.2%	Rank history: not on the FY2022–FY2024 lists and #85 in FY2025; down 65 since FY2020.
76	Nevada State Veterans Home Through Board of Regents of Nevada System of Higher Education Top agencies DTRA (Defense Threat Reduction Agency)	$968,670	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Utility Development Corp Top agencies DLA (Defense Logistics Agency)	$923,652	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	RTX Corporation 3 awardees, including Raytheon Company and Rockwell Collins, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$921,702	0.2%	Rank history: #43 in FY2022, #25 in FY2023, #21 in FY2024 and #14 in FY2025; new, not ranked in FY2020.
79	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$902,727	0.2%	Rank history: #16 in FY2022, #13 in FY2023, #43 in FY2024 and #30 in FY2025; new, not ranked in FY2020.
80	Aevex Aerospace, LLC Top agencies USAF (Department of the Air Force)	$822,665	0.2%	Rank history: #86 in FY2022, not on the FY2023 list, #38 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
81	Phase Sensitive Innovations Inc. Top agencies Army (Department of the Army)	$804,468	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	National Strategic Research Institute Top agencies DARPA (Defense Advanced Research Projects Agency) USAF (Department of the Air Force)	$800,402	0.2%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
83	Skydweller US Inc. Top agencies Navy (Department of the Navy)	$765,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Idaho Scientific LLC Top agencies USAF (Department of the Air Force)	$750,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Intellisense Systems Inc. Top agencies USAF (Department of the Air Force)	$750,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Agile RF Systems LLC Top agencies USAF (Department of the Air Force)	$749,999	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Architecture Technology Inc. 2 awardees, including Atc-Ny Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$749,883	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	XSB Inc. Top agencies DLA (Defense Logistics Agency)	$749,671	0.2%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
89	Maxentric Technologies LLC Top agencies USAF (Department of the Air Force)	$747,130	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Intific Inc Through Nuvotronics, Inc. Top agencies USAF (Department of the Air Force)	$669,663	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Curtiss-Wright Corporation Through Curtiss-Wright Electro-Mechanical Corporation Top agencies Navy (Department of the Navy)	$657,390	0.1%	Rank history: not on the FY2022–FY2025 lists; down 83 since FY2020.
92	Geometric Data Analytics Inc. Top agencies DARPA (Defense Advanced Research Projects Agency)	$623,801	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	NOU Systems Inc. Top agencies Army (Department of the Army)	$604,868	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Science Applications International Corporation Top agencies Navy (Department of the Navy)	$600,000	0.1%	Rank history: not on the FY2022–FY2024 lists and #28 in FY2025; new, not ranked in FY2020.
95	Koam Engineering Systems, Inc. Top agencies Navy (Department of the Navy)	$573,273	0.1%	Rank history: not on the FY2022–FY2023 lists, #62 in FY2024 and #42 in FY2025; new, not ranked in FY2020.
96	Board of Governers State University System of Florida Through University of Florida Top agencies DTRA (Defense Threat Reduction Agency)	$572,292	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Stottler Henke Associates, Inc. Top agencies Army (Department of the Army)	$554,991	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Vadum Inc. Top agencies Army (Department of the Army)	$549,997	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	American Maglev Technology of Florida, Inc. Top agencies DLA (Defense Logistics Agency)	$500,000	0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
100	Accenture Federal Services LLC Top agencies DLA (Defense Logistics Agency)	$499,987	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in 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 $485 million obligated before deobligations, so they never pass 100%.
• Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
• Fiscal year 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