Top 100 Contractors in PSC AR11: Space R&D Services; Space Flight, Research and Supporting Activities; Basic Research, FY2021

Name: Top 100 Contractors in PSC AR11: Space R&D Services; Space Flight, Research and Supporting Activities; 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 86% of FY2021 PSC AR11 contract dollars

Contract obligations: $1,673,406,791 Net of deobligations, by contracts coded PSC AR11
Contractors: 290 Parent companies with an obligation
Largest contractor: The Boeing Company $1.07 billion, 63.1% 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	The Boeing Company 8 awardees, including Boeing Aerospace Operations, Inc. and HRL Laboratories, LLC Top agencies NASA (National Aeronautics and Space Administration)	$1,069,809,972	63.1%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Northrop Grumman Corporation 7 awardees, including ATK Launch Systems LLC, Northrop Grumman Systems Corporation and Alliant Techsystems Operations LLC Top agencies NASA (National Aeronautics and Space Administration)	$175,279,267	10.3%	Rank history: #3 in FY2022, #3 in FY2023, #8 in FY2024 and #7 in FY2025; up 1 since FY2020.
3	The Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$91,074,054	5.4%	Rank history: #2 in FY2022, #2 in FY2023, #3 in FY2024 and not on the FY2025 list; up 187 since FY2020.
4	Kbr, Inc. Through KBR Wyle Services, LLC Top agencies NASA (National Aeronautics and Space Administration)	$24,311,726	1.4%	Rank history: #6 in FY2022, #10 in FY2023, #34 in FY2024 and not on the FY2025 list; up 2 since FY2020.
5	National Institute of Aerospace Associates Top agencies NASA (National Aeronautics and Space Administration)	$24,196,583	1.4%	Rank history: #9 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
6	The University of Alabama System 2 awardees, including The University of Alabama In Huntsville and University of Alabama Top agencies NASA (National Aeronautics and Space Administration)	$17,176,866	1.0%	Rank history: #8 in FY2022, #6 in FY2023, #10 in FY2024 and not on the FY2025 list; up 2 since FY2020.
7	Utah State University Through Utah State University Space Dynamics Laboratory Top agencies NASA (National Aeronautics and Space Administration)	$16,098,883	0.9%	Rank history: #16 in FY2022, #30 in FY2023, #39 in FY2024 and not on the FY2025 list; up 19 since FY2020.
8	University System of Maryland 2 awardees, including University of Maryland, College Park and University of Maryland Baltimore County Top agencies NASA (National Aeronautics and Space Administration)	$15,511,234	0.9%	Rank history: #5 in FY2022, #4 in FY2023, #14 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
9	Catholic University of America (The) Top agencies NASA (National Aeronautics and Space Administration)	$14,213,970	0.8%	Rank history: #10 in FY2022, #8 in FY2023, #11 in FY2024 and #13 in FY2025; new, not ranked in FY2020.
10	Science & Technology Corporation Top agencies NASA (National Aeronautics and Space Administration)	$10,744,165	0.6%	Rank history: #15 in FY2022, #13 in FY2023, #15 in FY2024 and #36 in FY2025; unchanged since FY2020.
11	Analytical Mechanics Associates, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$9,749,400	0.6%	Rank history: #11 in FY2022, #11 in FY2023, #18 in FY2024 and #11 in FY2025; unchanged since FY2020.
12	California Institute of Technology Top agencies NASA (National Aeronautics and Space Administration)	$8,192,692	0.5%	Rank history: #12 in FY2022, #12 in FY2023, #9 in FY2024 and #12 in FY2025; new, not ranked in FY2020.
13	University of Maryland, College Park Top agencies NASA (National Aeronautics and Space Administration)	$6,574,115	0.4%	Rank history: #24 in FY2022, #22 in FY2023, #7 in FY2024 and #4 in FY2025; up 59 since FY2020.
14	The University of Iowa Top agencies NASA (National Aeronautics and Space Administration)	$6,547,739	0.4%	Rank history: #4 in FY2022, #9 in FY2023, #20 in FY2024 and #14 in FY2025; down 9 since FY2020.
15	RTX Corporation 7 awardees, including Hamilton Sundstrand Corporation, Raytheon Company and Rohr, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$5,714,905	0.3%	Rank history: #23 in FY2022, #33 in FY2023, #27 in FY2024 and #22 in FY2025; up 193 since FY2020.
16	Ball Corp Through BAE Systems Space & Mission Systems Inc. Top agencies NASA (National Aeronautics and Space Administration)	$5,683,765	0.3%	Rank history: #19 in FY2022, #21 in FY2023, #29 in FY2024 and not on the FY2025 list; unchanged since FY2020.
17	General Electric Company Top agencies NASA (National Aeronautics and Space Administration)	$5,411,807	0.3%	Rank history: #36 in FY2022, #45 in FY2023, #36 in FY2024 and #55 in FY2025; up 73 since FY2020.
18	Cosm Advanced Manufacturing Systems LLC Top agencies NASA (National Aeronautics and Space Administration)	$4,962,338	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	Ensign-Bickford Industries Inc. 2 awardees, including Honeybee Robotics, Ltd. Top agencies NASA (National Aeronautics and Space Administration)	$4,744,514	0.3%	Rank history: #18 in FY2022, #84 in FY2023, #59 in FY2024 and not on the FY2025 list; down 1 since FY2020.
20	The Regents of the University of Colorado Top agencies NASA (National Aeronautics and Space Administration)	$4,475,419	0.3%	Rank history: #33 in FY2022, #17 in FY2023, #25 in FY2024 and #16 in FY2025; up 16 since FY2020.
21	Lockheed Martin Corporation 3 awardees Top agencies NASA (National Aeronautics and Space Administration)	$4,432,885	0.3%	Rank history: #17 in FY2022, #24 in FY2023, #16 in FY2024 and #17 in FY2025; up 14 since FY2020.
22	Vector Atomic Inc. Top agencies OSD (Office of the Secretary of Defense)	$4,111,481	0.2%	Rank history: #20 in FY2022 and not on the FY2023–FY2025 lists; up 462 since FY2020.
23	Advanced Space LLC Top agencies NASA (National Aeronautics and Space Administration)	$4,099,520	0.2%	Rank history: #22 in FY2022, #35 in FY2023, #57 in FY2024 and not on the FY2025 list; down 10 since FY2020.
24	Advanced Technologies, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$3,823,892	0.2%	Rank history: #41 in FY2022, #37 in FY2023, #73 in FY2024 and #73 in FY2025; up 85 since FY2020.
25	The Aerospace Corporation Top agencies NASA (National Aeronautics and Space Administration)	$3,799,515	0.2%	Rank history: #38 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
26	Government of the United States 2 awardees, including Smithsonian Institution Top agencies NASA (National Aeronautics and Space Administration)	$3,773,093	0.2%	Rank history: #34 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 214 since FY2020.
27	Made in Space Inc. 2 awardees, including Redwire Space Solutions, LLC Top agencies NASA (National Aeronautics and Space Administration)	$3,737,374	0.2%	Rank history: #14 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
28	Peregrine Falcon Corp Top agencies NASA (National Aeronautics and Space Administration)	$3,588,755	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	Southwest Research Institute Top agencies NASA (National Aeronautics and Space Administration)	$3,338,365	0.2%	Rank history: #25 in FY2022, #23 in FY2023, #42 in FY2024 and #15 in FY2025; up 40 since FY2020.
30	The Johns Hopkins University Applied Physics Laboratory LLC Top agencies USAF (Department of the Air Force)	$3,118,000	0.2%	Rank history: not on the FY2022–FY2023 lists, #2 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
31	State of California Controllers Office 7 awardees, including The Regents of the University of California, University of California San Diego and University of California, LOS Angeles Top agencies NASA (National Aeronautics and Space Administration)	$3,090,257	0.2%	Rank history: #7 in FY2022, #7 in FY2023, #24 in FY2024 and not on the FY2025 list; up 465 since FY2020.
32	Motiv Space Systems, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$2,886,102	0.2%	Rank history: #53 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
33	Antara Teknik LLC Top agencies NASA (National Aeronautics and Space Administration)	$2,829,282	0.2%	Rank history: not on the FY2022–FY2025 lists; up 80 since FY2020.
34	The University of Alabama In Huntsville Top agencies NASA (National Aeronautics and Space Administration)	$2,578,010	0.2%	Rank history: not on the FY2022–FY2023 lists, #22 in FY2024 and #8 in FY2025; down 22 since FY2020.
35	M.m.a. Design LLC Top agencies NASA (National Aeronautics and Space Administration)	$2,498,133	0.1%	Rank history: #61 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
36	Planetary Science Institute Top agencies NASA (National Aeronautics and Space Administration)	$2,269,100	0.1%	Rank history: #50 in FY2022, #44 in FY2023 and not on the FY2024–FY2025 lists; up 69 since FY2020.
37	Nanoracks LLC Top agencies NASA (National Aeronautics and Space Administration)	$2,247,889	0.1%	Rank history: #28 in FY2022, #18 in FY2023, #23 in FY2024 and #23 in FY2025; new, not ranked in FY2020.
38	General Atomic Technologies Corporation Through General Atomics Aeronautical Systems, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$2,184,036	0.1%	Rank history: #84 in FY2022, #81 in FY2023, #75 in FY2024 and not on the FY2025 list; up 197 since FY2020.
39	State of Arizona Through University of Arizona Top agencies NASA (National Aeronautics and Space Administration)	$2,040,051	0.1%	Rank history: not on the FY2022 list, #40 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
40	Zin Technologies, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,992,126	0.1%	Rank history: #13 in FY2022, #27 in FY2023, #37 in FY2024 and #29 in FY2025; up 246 since FY2020.
41	Future Engineers LLC Top agencies NASA (National Aeronautics and Space Administration)	$1,921,973	0.1%	Rank history: #42 in FY2022, #57 in FY2023, #54 in FY2024 and not on the FY2025 list; up 186 since FY2020.
42	Gamma Alloys, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,899,999	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Axiom Space Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,690,000	0.1%	Rank history: #35 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
44	N.v.i. Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,628,066	0.1%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
45	Alphacore Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,517,691	0.1%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
46	University of Washington Top agencies NASA (National Aeronautics and Space Administration)	$1,494,155	0.1%	Rank history: not on the FY2022–FY2024 lists and #60 in FY2025; new, not ranked in FY2020.
47	Continuum Dynamics Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,489,305	0.1%	Rank history: not on the FY2022–FY2025 lists; up 217 since FY2020.
48	PAE Government Services Inc. Through Centra Technology, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,484,554	0.1%	Rank history: #51 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
49	Trustees of Dartmouth College Top agencies NASA (National Aeronautics and Space Administration)	$1,483,912	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Georgia TECH Research Corp Top agencies NASA (National Aeronautics and Space Administration)	$1,477,601	0.1%	Rank history: #79 in FY2022, #72 in FY2023, #48 in FY2024 and #51 in FY2025; up 5 since FY2020.
51	Wichita State University Top agencies NASA (National Aeronautics and Space Administration)	$1,427,440	0.1%	Rank history: #21 in FY2022, not on the FY2023 list, #38 in FY2024 and #27 in FY2025; new, not ranked in FY2020.
52	Jacobs Engineering Group Inc. Through The Keyw Corporation Top agencies USSOCOM (United States Special Operations Command)	$1,397,539	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Rei Systems, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,340,953	0.1%	Rank history: not on the FY2022–FY2025 lists; up 153 since FY2020.
54	The Keyw Corporation Top agencies USSOCOM (United States Special Operations Command)	$1,339,503	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Virginia Diodes, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,312,485	0.1%	Rank history: not on the FY2022–FY2025 lists; up 37 since FY2020.
56	The University of Chicago Top agencies NASA (National Aeronautics and Space Administration)	$1,174,208	0.1%	Rank history: #88 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; up 439 since FY2020.
57	MKS Instruments Inc. Through Ophir Corporation Top agencies NASA (National Aeronautics and Space Administration)	$1,172,581	0.1%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
58	Beyond Photonics, LLC Top agencies NASA (National Aeronautics and Space Administration)	$1,147,351	0.1%	Rank history: not on the FY2022–FY2025 lists; up 187 since FY2020.
59	Board of Governers State University System of Florida 3 awardees, including University of Florida, Florida A & M University and The University of Central Florida Board of Trustees Top agencies NASA (National Aeronautics and Space Administration)	$990,394	0.1%	Rank history: not on the FY2022 list, #43 in FY2023 and not on the FY2024–FY2025 lists; up 228 since FY2020.
60	Arizona State University Top agencies NASA (National Aeronautics and Space Administration)	$974,498	0.1%	Rank history: #45 in FY2022, #42 in FY2023, #53 in FY2024 and not on the FY2025 list; up 221 since FY2020.
61	Cornerstone Research Group Inc. Top agencies NASA (National Aeronautics and Space Administration)	$947,904	0.1%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
62	Fibertek, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$930,621	0.1%	Rank history: #26 in FY2022, not on the FY2023 list, #85 in FY2024 and not on the FY2025 list; down 47 since FY2020.
63	Virginia Polytechnic Institute & State University Top agencies NASA (National Aeronautics and Space Administration)	$919,304	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	The Vanderbilt University Top agencies NASA (National Aeronautics and Space Administration)	$878,955	0.1%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
65	Nexolve Holding Company, LLC Top agencies NASA (National Aeronautics and Space Administration)	$849,640	0.1%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
66	Bluehalo Labs, LLC Top agencies NASA (National Aeronautics and Space Administration)	$846,573	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 146 since FY2020.
67	Plasma Processes, LLC Top agencies NASA (National Aeronautics and Space Administration)	$824,999	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
68	Odyssey Systems Consulting Group, Ltd. Top agencies USAF (Department of the Air Force)	$811,940	<0.1%	Rank history: #67 in FY2022, #76 in FY2023, #95 in FY2024 and not on the FY2025 list; up 59 since FY2020.
69	Touchstone Research Laboratory, Ltd. Top agencies NASA (National Aeronautics and Space Administration)	$759,998	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 213 since FY2020.
70	Creare LLC Top agencies NASA (National Aeronautics and Space Administration)	$755,444	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 43 since FY2020.
71	Cactus Materials Inc. Top agencies NASA (National Aeronautics and Space Administration)	$754,999	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 266 since FY2020.
72	Ultra-Low Loss Technologies, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$750,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Chemtronergy LLC Top agencies NASA (National Aeronautics and Space Administration)	$750,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Research In Flight LLC Top agencies NASA (National Aeronautics and Space Administration)	$749,999	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 158 since FY2020.
75	Nanovox, LLC Top agencies NASA (National Aeronautics and Space Administration)	$749,998	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 185 since FY2020.
76	Atsp Innovations Inc. Top agencies NASA (National Aeronautics and Space Administration)	$749,993	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 18 since FY2020.
77	Mirios, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$749,946	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Spectral Energies LLC Top agencies NASA (National Aeronautics and Space Administration)	$749,803	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 75 since FY2020.
79	Tietronix Software Inc. Top agencies NASA (National Aeronautics and Space Administration)	$749,742	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 295 since FY2020.
80	Sonelite, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$749,618	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Espace Inc. Top agencies NASA (National Aeronautics and Space Administration)	$749,565	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Exoterra Resource LLC Top agencies NASA (National Aeronautics and Space Administration)	$749,375	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 336 since FY2020.
83	Qortek Inc. Top agencies NASA (National Aeronautics and Space Administration)	$749,184	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
84	Multi3D Inc. Top agencies NASA (National Aeronautics and Space Administration)	$742,905	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	H2O Insights LLC Top agencies NASA (National Aeronautics and Space Administration)	$742,804	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Spirit Aerosystems Holdings, Inc. Through Spirit Aerosystems Inc. Top agencies NASA (National Aeronautics and Space Administration)	$725,683	<0.1%	Rank history: #92 in FY2022, #15 in FY2023, #26 in FY2024 and #61 in FY2025; new, not ranked in FY2020.
87	Freedom Photonics LLC Top agencies NASA (National Aeronautics and Space Administration)	$724,480	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 50 since FY2020.
88	Nevada State Veterans Home 3 awardees, including Board of Regents of Nevada System of Higher Education and Nevada System of Higher Education Top agencies NASA (National Aeronautics and Space Administration)	$716,926	<0.1%	Rank history: not on the FY2022 list, #52 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
89	Leonardo S.p.A. Through DRS Network & Imaging Systems LLC Top agencies NASA (National Aeronautics and Space Administration)	$714,481	<0.1%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
90	Centra Technology, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$710,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 26 since FY2020.
91	The Texas A&M University System 3 awardees, including Texas A & M University, Texas A & M University System Health Science Center and Texas A&M Engineering Experiment Station Top agencies NASA (National Aeronautics and Space Administration)	$692,020	<0.1%	Rank history: #90 in FY2022, #34 in FY2023 and not on the FY2024–FY2025 lists; up 265 since FY2020.
92	University of Illinois Top agencies NASA (National Aeronautics and Space Administration)	$666,988	<0.1%	Rank history: #54 in FY2022, #70 in FY2023, #98 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
93	Paragon Space Development Corporation Top agencies NASA (National Aeronautics and Space Administration)	$666,444	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 60 since FY2020.
94	Calnetix, Inc. Through Calnetix Technologies LLC Top agencies NASA (National Aeronautics and Space Administration)	$662,929	<0.1%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
95	Sri International Top agencies NASA (National Aeronautics and Space Administration)	$642,884	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
96	Aosense, Inc. Top agencies OSD (Office of the Secretary of Defense)	$638,519	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 51 since FY2020.
97	Precision Combustion, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$612,676	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 30 since FY2020.
98	Alabama Space Science Exhibit Commission Top agencies NASA (National Aeronautics and Space Administration)	$612,500	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	University System of New Hampshire Top agencies NASA (National Aeronautics and Space Administration)	$590,074	<0.1%	Rank history: #37 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
100	Sonalysts Inc. Top agencies NASA (National Aeronautics and Space Administration)	$587,612	<0.1%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; up 248 since FY2020.

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100 of 290 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 $1.7 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

Who were the top 10 PSC AR11 contractors in FY2021?

1. The Boeing Company ($1.07B), 2. Northrop Grumman Corporation ($175M), 3. The Johns Hopkins University ($91.1M), 4. Kbr, Inc. ($24.3M), 5. National Institute of Aerospace Associates ($24.2M), 6. The University of Alabama System ($17.2M), 7. Utah State University ($16.1M), 8. University System of Maryland ($15.5M), 9. Catholic University of America (The) ($14.2M), 10. Science & Technology Corporation ($10.7M).

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