Top 100 Contractors in PSC AC11: National Defense R&D Services; Department of Defense – Military; Basic Research, FY2021

Name: Top 100 Contractors in PSC AC11: National Defense R&D Services; Department of Defense – Military; Basic Research, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 49% of FY2021 PSC AC11 contract dollars

Contract obligations: $431,436,366 Net of deobligations, by contracts coded PSC AC11
Contractors: 435 Parent companies with an obligation
Largest contractor: RTX Corporation $53.4 million, 12.3% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	RTX Corporation 7 awardees, including Raytheon Company Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$53,439,211	12.3%	Rank history: #3 in FY2022, #10 in FY2023, #1 in FY2024 and #2 in FY2025; up 13 since FY2020.
2	Lockheed Martin Corporation 5 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$41,383,215	9.5%	Rank history: #4 in FY2022, #1 in FY2023, #2 in FY2024 and #3 in FY2025; up 10 since FY2020.
3	Leidos Holdings, Inc. Through Leidos, Inc. Top agencies USAF (Department of the Air Force) DARPA (Defense Advanced Research Projects Agency)	$33,482,028	7.7%	Rank history: #2 in FY2022, #4 in FY2023, #5 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
4	On Assignment, Inc. Through ECS Federal, LLC Top agencies WHS (DOD Washington Headquarters Service)	$16,250,000	3.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
5	Northrop Grumman Corporation 4 awardees, including Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy) DARPA (Defense Advanced Research Projects Agency) NASA (National Aeronautics and Space Administration)	$13,809,112	3.2%	Rank history: #9 in FY2022, #16 in FY2023, #10 in FY2024 and #14 in FY2025; unchanged since FY2020.
6	Wichita State University Top agencies USAF (Department of the Air Force)	$13,775,400	3.2%	Rank history: #7 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
7	L3Harris Technologies, Inc. 5 awardees, including L3Harris Linchpin Labs, Inc., L3Harris Technologies Integrated Systems L.P. and L3 Technologies, Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$13,616,540	3.1%	Rank history: #14 in FY2022, #14 in FY2023, #20 in FY2024 and #19 in FY2025; up 6 since FY2020.
8	University System of Maryland Through University of Maryland, College Park Top agencies OSD (Office of the Secretary of Defense) DARPA (Defense Advanced Research Projects Agency)	$11,413,063	2.6%	Rank history: #35 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
9	Icr, Inc. Top agencies USAF (Department of the Air Force)	$10,130,538	2.3%	Rank history: #11 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
10	Applied Research Associates, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$7,600,078	1.7%	Rank history: #36 in FY2022, #7 in FY2023, #13 in FY2024 and #13 in FY2025; new, not ranked in FY2020.
11	Physical Sciences Inc. 2 awardees, including Faraday Technology, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) Army (Department of the Army) Navy (Department of the Navy)	$6,420,161	1.5%	Rank history: #16 in FY2022, #26 in FY2023, #27 in FY2024 and #30 in FY2025; up 6 since FY2020.
12	Par Technology Corporation Through Par Government Systems Corporation Top agencies Army (Department of the Army)	$6,356,901	1.5%	Rank history: not on the FY2022–FY2023 lists, #59 in FY2024 and #75 in FY2025; new, not ranked in FY2020.
13	The Trustees of the Stevens Institute of Technology Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army)	$5,836,275	1.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
14	Alder Energy, LLC Top agencies DLA (Defense Logistics Agency)	$4,817,500	1.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
15	Asrc Federal Professional Services, LLC Top agencies Army (Department of the Army)	$4,464,213	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	The Boeing Company 10 awardees, including Millennium Space Systems, Inc. Top agencies NASA (National Aeronautics and Space Administration) DARPA (Defense Advanced Research Projects Agency) Navy (Department of the Navy)	$4,426,444	1.0%	Rank history: #5 in FY2022, #12 in FY2023, #7 in FY2024 and #7 in FY2025; down 15 since FY2020.
17	Fibertek, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$4,252,532	1.0%	Rank history: #6 in FY2022, #8 in FY2023, #11 in FY2024 and #20 in FY2025; new, not ranked in FY2020.
18	Verus Research, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$4,179,864	1.0%	Rank history: #13 in FY2022, not on the FY2023 list, #77 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
19	Bluehalo, LLC Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense) DMEA (Defense Microelectronics Activity)	$3,733,857	0.9%	Rank history: #19 in FY2022, #47 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
20	Triton Systems, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,294,190	0.8%	Rank history: #24 in FY2022, #33 in FY2023, #34 in FY2024 and #57 in FY2025; up 5 since FY2020.
21	Cornerstone Research Group Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DMEA (Defense Microelectronics Activity)	$3,186,677	0.7%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
22	Advanced Core Concepts LLC Through Arctos Technology Solutions, LLC Top agencies USAF (Department of the Air Force)	$3,098,833	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	Revacomm Inc. Top agencies USAF (Department of the Air Force)	$2,854,531	0.7%	Rank history: #10 in FY2022, #23 in FY2023, #42 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
24	Intellisense Systems Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$2,745,955	0.6%	Rank history: #33 in FY2022, #60 in FY2023, #73 in FY2024 and #85 in FY2025; new, not ranked in FY2020.
25	Ohio Aerospace Institute Top agencies USAF (Department of the Air Force)	$2,685,150	0.6%	Rank history: #87 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
26	Sri International Top agencies DARPA (Defense Advanced Research Projects Agency)	$2,484,937	0.6%	Rank history: #25 in FY2022, not on the FY2023 list, #50 in FY2024 and #26 in FY2025; new, not ranked in FY2020.
27	University Corporation for Atmospheric Research Top agencies USAF (Department of the Air Force)	$2,373,408	0.5%	Rank history: not on the FY2022–FY2024 lists and #35 in FY2025; new, not ranked in FY2020.
28	University of Southern California Top agencies DARPA (Defense Advanced Research Projects Agency)	$2,239,774	0.5%	Rank history: #22 in FY2022, #51 in FY2023, #86 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
29	Infleqtion Quantum, LLC Top agencies DARPA (Defense Advanced Research Projects Agency) Navy (Department of the Navy)	$2,118,400	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	Anduril Industries, Inc. Top agencies USAF (Department of the Air Force)	$2,000,000	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	Signalscape Inc. Top agencies USSOCOM (United States Special Operations Command)	$1,946,311	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Bluehalo Labs, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,911,500	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	Charles River Analytics, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,892,154	0.4%	Rank history: #23 in FY2022, #46 in FY2023, #58 in FY2024 and #79 in FY2025; new, not ranked in FY2020.
34	General Electric Company 2 awardees, including GE Aviation Systems LLC Top agencies DARPA (Defense Advanced Research Projects Agency) USAF (Department of the Air Force)	$1,847,167	0.4%	Rank history: #28 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
35	Georgia TECH Research Corp 2 awardees, including Georgia TECH Applied Research Corp Top agencies DARPA (Defense Advanced Research Projects Agency)	$1,799,284	0.4%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; down 20 since FY2020.
36	Pacific Marine & Supply Company Ltd Through Pacmar Technologies LLC Top agencies DARPA (Defense Advanced Research Projects Agency) Navy (Department of the Navy)	$1,779,963	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	Caci Photonics, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,752,575	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Science, Engineering, Management Solutions, LLC Top agencies Navy (Department of the Navy)	$1,671,822	0.4%	Rank history: not on the FY2022–FY2023 lists, #85 in FY2024 and #71 in FY2025; new, not ranked in FY2020.
39	Purdue University Top agencies DARPA (Defense Advanced Research Projects Agency)	$1,660,117	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Enertia Microsystems Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,639,212	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
41	Chip Design Systems Inc. Top agencies Army (Department of the Army)	$1,635,573	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Kraus Hamdani Aerospace, Inc. Top agencies Navy (Department of the Navy)	$1,550,000	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Rydberg Technologies Inc. Top agencies OSD (Office of the Secretary of Defense)	$1,510,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	Kitware Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) USAF (Department of the Air Force)	$1,396,138	0.3%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
45	Phase Sensitive Innovations Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,386,446	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Regents of the University of Michigan Top agencies DARPA (Defense Advanced Research Projects Agency)	$1,379,937	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	State of California Controllers Office 3 awardees, including University of California, Davis and University of California, San Diego Top agencies DARPA (Defense Advanced Research Projects Agency) NASA (National Aeronautics and Space Administration)	$1,374,232	0.3%	Rank history: not on the FY2022 list, #58 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
48	Board of Governers State University System of Florida 2 awardees, including The University of Central Florida Board of Trustees and University of Florida Top agencies DARPA (Defense Advanced Research Projects Agency) USAF (Department of the Air Force)	$1,362,374	0.3%	Rank history: not on the FY2022–FY2025 lists; down 40 since FY2020.
49	General Dynamics Corporation 3 awardees, including Applied Physical Sciences Corp and General Dynamics Mission Systems, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$1,362,123	0.3%	Rank history: not on the FY2022 list, #11 in FY2023, #16 in FY2024 and #11 in FY2025; new, not ranked in FY2020.
50	Oceanit Laboratories Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$1,335,320	0.3%	Rank history: not on the FY2022–FY2023 lists, #43 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
51	Strategic Analysis, Inc. Top agencies Navy (Department of the Navy)	$1,328,765	0.3%	Rank history: #37 in FY2022, #61 in FY2023, #90 in FY2024 and #77 in FY2025; new, not ranked in FY2020.
52	Trustees of Boston College Top agencies USAF (Department of the Air Force)	$1,314,852	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Xilectric, Inc. Top agencies Army (Department of the Army)	$1,216,491	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Graf Research Corporation Top agencies DMEA (Defense Microelectronics Activity) Army (Department of the Army)	$1,211,477	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	PC Krause & Associates Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,197,831	0.3%	Rank history: #55 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
56	Nextech Materials, Ltd. Top agencies Army (Department of the Army)	$1,178,535	0.3%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
57	Global Engineering & Materials Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$1,169,985	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Oleandr Scientific LLC Top agencies Army (Department of the Army)	$1,150,000	0.3%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
59	The Johns Hopkins University Through The Johns Hopkins University Applied Physics Laboratory LLC Top agencies DARPA (Defense Advanced Research Projects Agency) Navy (Department of the Navy)	$1,144,047	0.3%	Rank history: #1 in FY2022, #2 in FY2023, #12 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
60	Filtration Solutions, Inc. Top agencies Army (Department of the Army)	$1,118,896	0.3%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
61	Chromologic LLC Top agencies DMEA (Defense Microelectronics Activity)	$1,099,989	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Nanoelectronic Imaging, Inc. Top agencies DMEA (Defense Microelectronics Activity)	$1,099,848	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Autonomous Solutions Inc. Top agencies Army (Department of the Army)	$1,093,792	0.3%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
64	Novateur Research Solutions LLC Top agencies Army (Department of the Army) DARPA (Defense Advanced Research Projects Agency)	$1,047,006	0.2%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
65	Mid Michigan Research LLC Top agencies Army (Department of the Army)	$1,028,363	0.2%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
66	Agiledelta, Inc. Top agencies USAF (Department of the Air Force)	$1,008,128	0.2%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
67	The Charles Stark Draper Laboratory, Inc. Top agencies Navy (Department of the Navy)	$1,000,000	0.2%	Rank history: #17 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
68	Grammatech, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency)	$1,000,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Turnaround Factor, Inc. Top agencies DLA (Defense Logistics Agency)	$999,982	0.2%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
70	Xerox Holdings Corp Through Palo Alto Research Center LLC Top agencies DARPA (Defense Advanced Research Projects Agency)	$999,931	0.2%	Rank history: #21 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
71	Cubrc, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency)	$999,928	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Special Circumstances LLC Top agencies DARPA (Defense Advanced Research Projects Agency)	$998,711	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Luna Innovations Incorporated Top agencies Navy (Department of the Navy)	$986,488	0.2%	Rank history: #48 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
74	Alphacore Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$976,326	0.2%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
75	Attollo Engineering, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$954,708	0.2%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
76	Hypres Inc. Top agencies OSD (Office of the Secretary of Defense)	$899,988	0.2%	Rank history: not on the FY2022–FY2023 lists, #62 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
77	Kent Optronics Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$885,069	0.2%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
78	Freedom Photonics LLC Top agencies Navy (Department of the Navy) DARPA (Defense Advanced Research Projects Agency)	$784,916	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	Vision Point Systems, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$775,550	0.2%	Rank history: not on the FY2022–FY2023 lists, #49 in FY2024 and #45 in FY2025; new, not ranked in FY2020.
80	Makai Ocean Engineering Inc. Top agencies Army (Department of the Army)	$772,463	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Carnegie-Mellon University Top agencies DARPA (Defense Advanced Research Projects Agency)	$754,297	0.2%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
82	Aging Aircraft Consulting LLC Top agencies USAF (Department of the Air Force)	$749,987	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Exciting Technology LLC Top agencies USAF (Department of the Air Force)	$749,932	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Intelligent Fiber Optic Systems Corporation Top agencies USAF (Department of the Air Force)	$749,887	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Teledevices LLC Top agencies USAF (Department of the Air Force)	$749,850	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Leidos, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency)	$746,138	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	CFD Research Corporation Top agencies Navy (Department of the Navy) DMEA (Defense Microelectronics Activity)	$727,205	0.2%	Rank history: #32 in FY2022, #85 in FY2023, #95 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
88	BAE Systems PLC Through BAE Systems Information and Electronic Systems Integration Inc. Top agencies DARPA (Defense Advanced Research Projects Agency)	$704,788	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Precision Combustion, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$689,732	0.2%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
90	Corvid Technologies, LLC Top agencies DARPA (Defense Advanced Research Projects Agency) Army (Department of the Army)	$664,331	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Omnitek Partners LLC Top agencies Army (Department of the Army)	$655,293	0.2%	Rank history: not on the FY2022–FY2023 lists, #100 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
92	Tai-Yang Research Company Top agencies DARPA (Defense Advanced Research Projects Agency) Navy (Department of the Navy)	$640,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Galois, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) Navy (Department of the Navy)	$639,691	0.1%	Rank history: not on the FY2022–FY2023 lists, #25 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
94	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies USAF (Department of the Air Force)	$634,310	0.1%	Rank history: #82 in FY2022, #3 in FY2023, #3 in FY2024 and #4 in FY2025; new, not ranked in FY2020.
95	Fabmetrix Inc. Top agencies Army (Department of the Army)	$605,735	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Qmagiq LLC Top agencies Army (Department of the Army)	$603,996	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Nielson Scientific LLC Top agencies Army (Department of the Army)	$603,750	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Agilesystems LLC Top agencies Army (Department of the Army)	$584,653	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Electric Drivetrain Technologies LLC Top agencies Army (Department of the Army)	$567,231	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Twinleaf LLC Top agencies DARPA (Defense Advanced Research Projects Agency)	$562,836	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 435 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 $435 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

Who were the top 10 PSC AC11 contractors in FY2021?

1. RTX Corporation ($53.4M), 2. Lockheed Martin Corporation ($41.4M), 3. Leidos Holdings, Inc. ($33.5M), 4. On Assignment, Inc. ($16.3M), 5. Northrop Grumman Corporation ($13.8M), 6. Wichita State University ($13.8M), 7. L3Harris Technologies, Inc. ($13.6M), 8. University System of Maryland ($11.4M), 9. Icr, Inc. ($10.1M), 10. Applied Research Associates, Inc. ($7.6M).

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